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1732 lines
61 KiB
Java
1732 lines
61 KiB
Java
/*
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* @(#)ClassLoader.java 1.162 02/03/19
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*
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* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
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* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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import java.io.InputStream;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.io.PrintWriter;
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import java.io.File;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.util.Hashtable;
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import java.util.Enumeration;
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import java.util.Vector;
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import java.util.Stack;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.NoSuchElementException;
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import java.util.Set;
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import java.util.jar.Manifest;
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import java.net.URL;
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import java.net.MalformedURLException;
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import java.security.AccessController;
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import java.security.AccessControlContext;
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import java.security.PrivilegedAction;
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import java.security.PrivilegedActionException;
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import java.security.PrivilegedExceptionAction;
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import java.security.ProtectionDomain;
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import java.security.Permissions;
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import java.security.CodeSource;
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import java.security.Policy;
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import sun.misc.URLClassPath;
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import sun.misc.Resource;
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import sun.misc.CompoundEnumeration;
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import sun.misc.ClassFileTransformer;
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//import sun.misc.Launcher;
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import sun.reflect.Reflection;
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import sun.security.action.GetPropertyAction;
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/**
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* A class loader is an object that is responsible for loading
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* classes. The class <code>ClassLoader</code> is an abstract class.
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* Given the name of a class, a class loader should attempt to locate
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* or generate data that constitutes a definition for the class. A
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* typical strategy is to transform the name into a file
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* name and then read a "class file" of that name from a file system.
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* <p>
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* Every <code>Class</code> object contains a
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* {@link Class#getClassLoader() reference} to the
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* <code>ClassLoader</code> that defined it.
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* <p>
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* Class objects for array classes are not created by class loaders, but
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* are created automatically as required by the Java runtime. The class
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* loader for an array class, as returned by {@link Class#getClassLoader()}
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* is the same as the class loader for its element type; if the element
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* type is a primitive type, then the array class has no class loader.
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* <p>
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* Applications implement subclasses of <code>ClassLoader</code> in
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* order to extend the manner in which the Java virtual machine
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* dynamically loads classes.
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* <p>
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* Class loaders may typically be used by security managers to
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* indicate security domains.
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* <p>
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* The <code>ClassLoader</code> class uses a delegation model to
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* search for classes and resources. Each instance of
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* <code>ClassLoader</code> has an associated parent class loader.
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* When called upon to find a class or resource, a
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* <code>ClassLoader</code> instance will delegate the search for
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* the class or resource to its parent class loader before
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* attempting to find the class or resource itself. The virtual
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* machine's built-in class loader, called the bootstrap class loader,
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* does not itself have a parent but may serve as the parent of a
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* <code>ClassLoader</code> instance.
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* <p>
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* Normally, the Java virtual machine loads classes from the local
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* file system in a platform-dependent manner. For example, on UNIX
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* systems, the virtual machine loads classes from the directory
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* defined by the <code>CLASSPATH</code> environment variable.
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* <p>
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* However, some classes may not originate from a file; they may
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* originate from other sources, such as the network, or they could
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* be constructed by an application. The method
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* <code>defineClass</code> converts an array of bytes into an
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* instance of class <code>Class</code>. Instances of this newly
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* defined class can be created using the <code>newInstance</code>
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* method in class <code>Class</code>.
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* <p>
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* The methods and constructors of objects created by a class loader
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* may reference other classes. To determine the class(es) referred
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* to, the Java virtual machine calls the <code>loadClass</code>
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* method of the class loader that originally created the class.
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* <p>
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* For example, an application could create a network class loader
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* to download class files from a server. Sample code might look like:
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* <blockquote><pre>
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* ClassLoader loader = new NetworkClassLoader(host, port);
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* Object main = loader.loadClass("Main", true).newInstance();
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* . . .
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* </pre></blockquote>
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* <p>
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* The network class loader subclass must define the methods
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* <code>findClass</code> and <code>loadClassData</code>
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* to load a class from the network. Once it
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* has downloaded the bytes that make up the class, it should use the
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* method <code>defineClass</code> to create a class instance. A
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* sample implementation is:
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* <p><hr><blockquote><pre>
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* class NetworkClassLoader extends ClassLoader {
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* String host;
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* int port;
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*
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* public Class findClass(String name) {
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* byte[] b = loadClassData(name);
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* return defineClass(name, b, 0, b.length);
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* }
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*
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* private byte[] loadClassData(String name) {
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* // load the class data from the connection
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* . . .
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* }
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* }
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* </pre></blockquote><hr>
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*
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* @version 1.162, 03/19/02
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* @see java.lang.Class
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* @see java.lang.Class#newInstance()
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* @see java.lang.ClassLoader#defineClass(byte[], int, int)
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* @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
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* @see java.lang.ClassLoader#resolveClass(java.lang.Class)
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* @since JDK1.0
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*/
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public abstract class ClassLoader {
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private static native void registerNatives();
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static {
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registerNatives();
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}
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/*
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* If initialization succeed this is set to true and security checks will
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* succeed. Otherwise the object is not initialized and the object is
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* useless.
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*/
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private boolean initialized = false;
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/*
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* The parent class loader for delegation.
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*/
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private ClassLoader parent;
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/*
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* Hashtable that maps packages to certs
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*/
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private Hashtable package2certs = new Hashtable(11);
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/*
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* shared among all packages with unsigned classes
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*/
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java.security.cert.Certificate[] nocerts;
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/*
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* The classes loaded by this class loader. The only purpose of this
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* table is to keep the classes from being GC'ed until the loader
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* is GC'ed.
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*/
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private Vector classes = new Vector();
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/*
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* The initiating protection domains for all classes
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* loaded by this loader.
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*/
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private Set domains = new HashSet();
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/*
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* Called by the VM to record every loaded class with this loader.
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*/
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void addClass(Class c) {
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classes.addElement(c);
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}
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/*
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* The packages defined in this class loader. Each package name is
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* mapped to its corresponding Package object.
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*/
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private HashMap packages = new HashMap();
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/**
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* Creates a new class loader using the specified parent class loader
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* for delegation.
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* <p>
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* If there is a security manager, its <code>checkCreateClassLoader</code>
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* method is called. This may result in a security exception.
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*
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* @param parent the parent class loader
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*
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* @throws SecurityException if a security manager exists and its
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* <code>checkCreateClassLoader</code> method doesn't allow creation of a
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* new class loader.
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* @see java.lang.SecurityException
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* @see java.lang.SecurityManager#checkCreateClassLoader()
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* @since 1.2
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*/
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protected ClassLoader(ClassLoader parent) {
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SecurityManager security = System.getSecurityManager();
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if (security != null) {
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security.checkCreateClassLoader();
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}
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this.parent = parent;
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initialized = true;
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}
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/**
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* Creates a new class loader using the <code>ClassLoader</code>
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* returned by the method <code>getSystemClassLoader()</code> as the
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* parent class loader.
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* <p>
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* If there is a security manager, its <code>checkCreateClassLoader</code>
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* method is called. This may result in a security exception.
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*
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* @throws SecurityException
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* if a security manager exists and its <code>checkCreateClassLoader</code>
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* method doesn't allow creation of a new class loader.
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*
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* @see java.lang.SecurityException
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* @see java.lang.SecurityManager#checkCreateClassLoader()
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*/
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protected ClassLoader() {
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SecurityManager security = System.getSecurityManager();
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if (security != null) {
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security.checkCreateClassLoader();
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}
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this.parent = getSystemClassLoader();
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initialized = true;
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}
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/**
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* Loads the class with the specified name. This method searches for
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* classes in the same manner as the {@link #loadClass(String, boolean)}
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* method. It is called by the Java virtual machine to resolve class
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* references. Calling this method is equivalent to calling
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* <code>loadClass(name, false)</code>.
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*
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* @param name the name of the class
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* @return the resulting <code>Class</code> object
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* @exception ClassNotFoundException if the class was not found
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*/
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public Class loadClass(String name) throws ClassNotFoundException
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{
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return loadClass(name, false);
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}
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/**
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* Loads the class with the specified name. The default implementation of
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* this method searches for classes in the following order:<p>
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*
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* <ol>
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* <li> Call {@link #findLoadedClass(String)} to check if the class has
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* already been loaded. <p>
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* <li> Call the <code>loadClass</code> method on the parent class
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* loader. If the parent is <code>null</code> the class loader
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* built-in to the virtual machine is used, instead. <p>
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* <li> Call the {@link #findClass(String)} method to find the class. <p>
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* </ol>
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*
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* If the class was found using the above steps, and the
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* <code>resolve</code> flag is true, this method will then call the
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* {@link #resolveClass(Class)} method on the resulting class object.
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* <p>
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* From the Java 2 SDK, v1.2, subclasses of ClassLoader are
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* encouraged to override
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* {@link #findClass(String)}, rather than this method.<p>
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*
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* @param name the name of the class
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* @param resolve if <code>true</code> then resolve the class
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* @return the resulting <code>Class</code> object
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* @exception ClassNotFoundException if the class could not be found
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*/
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protected synchronized Class loadClass(String name, boolean resolve)
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throws ClassNotFoundException
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{
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// First, check if the class has already been loaded
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Class c = findLoadedClass(name);
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if (c == null) {
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try {
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if (parent != null) {
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c = parent.loadClass(name, false);
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} else {
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c = findBootstrapClass0(name);
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}
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} catch (ClassNotFoundException e) {
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// If still not found, then call findClass in order
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// to find the class.
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c = findClass(name);
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}
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}
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if (resolve) {
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resolveClass(c);
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}
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return c;
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}
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/*
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* This method is called by the virtual machine to load
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* a class.
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*/
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private synchronized Class loadClassInternal(String name)
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throws ClassNotFoundException {
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return loadClass(name);
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}
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private void checkPackageAccess(Class cls, ProtectionDomain pd) {
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final SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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final String name = cls.getName();
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final int i = name.lastIndexOf('.');
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if (i != -1) {
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AccessController.doPrivileged(new PrivilegedAction() {
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public Object run() {
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sm.checkPackageAccess(name.substring(0, i));
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return null;
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}
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}, new AccessControlContext(new ProtectionDomain[] {pd}));
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}
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}
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domains.add(pd);
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}
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/**
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* Finds the specified class. This method should be overridden
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* by class loader implementations that follow the new delegation model
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* for loading classes, and will be called by the <code>loadClass</code>
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* method after checking the parent class loader for the requested class.
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* The default implementation throws <code>ClassNotFoundException</code>.
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*
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* @param name the name of the class
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* @return the resulting <code>Class</code> object
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* @exception ClassNotFoundException if the class could not be found
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* @since 1.2
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*/
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protected Class findClass(String name) throws ClassNotFoundException {
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throw new ClassNotFoundException(name);
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}
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/**
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* Converts an array of bytes into an instance of class
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* <code>Class</code>. Before the Class can be used it must be
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* resolved. This method is deprecated in favor of the version
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* that takes the class name as its first argument, and is more
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* secure.
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*
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* @param b the bytes that make up the class data. The bytes in
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* positions <code>off</code> through <code>off+len-1</code>
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* should have the format of a valid class file as defined
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* by the
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* <a href="http://java.sun.com/docs/books/vmspec/">Java
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* Virtual Machine Specification</a>.
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* @param off the start offset in <code>b</code> of the class data
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* @param len the length of the class data
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* @return the <code>Class</code> object that was created from the
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* specified class data
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* @exception ClassFormatError if the data did not contain a valid class
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* @exception IndexOutOfBoundsException if either <code>off</code> or
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* <code>len</code> is negative, or if
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* <code>off+len</code> is greater than <code>b.length</code>.
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* @see ClassLoader#loadClass(java.lang.String, boolean)
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* @see ClassLoader#resolveClass(java.lang.Class)
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* @deprecated Replaced by defineClass(java.lang.String, byte[], int, int)
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*/
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protected final Class defineClass(byte[] b, int off, int len)
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throws ClassFormatError
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{
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return defineClass(null, b, off, len, null);
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}
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/**
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* Converts an array of bytes into an instance of class <code>Class</code>.
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* Before the Class can be used it must be resolved.
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* <p>
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* This method assigns a default <code>ProtectionDomain</code> to
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* the newly defined class. The <code>ProtectionDomain</code>
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* contains the set of permissions granted when
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* a call to <code>Policy.getPolicy().getPermissions()</code> is made with
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* a code source of <code>null,null</code>. The default domain is
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* created on the first invocation of <code>defineClass</code>, and
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* re-used on subsequent calls.
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* <p>
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* To assign a specific <code>ProtectionDomain</code> to the class,
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* use the <code>defineClass</code> method that takes a
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* <code>ProtectionDomain</code> as one of its arguments.
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*
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* @param name the expected name of the class, or <code>null</code>
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* if not known, using '.' and not '/' as the separator
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* and without a trailing ".class" suffix.
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* @param b the bytes that make up the class data. The bytes in
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* positions <code>off</code> through <code>off+len-1</code>
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* should have the format of a valid class file as defined
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* by the
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* <a href="http://java.sun.com/docs/books/vmspec/">Java
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* Virtual Machine Specification</a>.
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* @param off the start offset in <code>b</code> of the class data
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* @param len the length of the class data
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* @return the <code>Class</code> object that was created from the
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* specified class data
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* @exception ClassFormatError if the data did not contain a valid class
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* @exception IndexOutOfBoundsException if either <code>off</code> or
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* <code>len</code> is negative, or if
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* <code>off+len</code> is greater than <code>b.length</code>.
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* @exception SecurityException if an attempt is made to add this class
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* to a package that contains classes that were signed by
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* a different set of certificates than this class (which
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* is unsigned), or if the class name begins with "java.".
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*
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* @see ClassLoader#loadClass(java.lang.String, boolean)
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* @see ClassLoader#resolveClass(java.lang.Class)
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* @see java.security.ProtectionDomain
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* @see java.security.Policy
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* @see java.security.CodeSource
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* @see java.security.SecureClassLoader
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* @since JDK1.1
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*/
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protected final Class defineClass(String name, byte[] b, int off, int len)
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throws ClassFormatError
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{
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return defineClass(name, b, off, len, null);
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}
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/**
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* Converts an array of bytes into an instance of class Class,
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* with an optional ProtectionDomain. If the domain is <code>null</code>,
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* then a default domain will be assigned to the class as specified
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* in the documentation for {@link #defineClass(String,byte[],int,int)}.
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* Before the class can be used it must be resolved.
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*
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* <p>The first class defined in a package determines the exact set of
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* certificates that all subsequent classes defined in that package must
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* contain. The set of certificates for a class is obtained from the
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* <code>CodeSource</code> within the <code>ProtectionDomain</code> of
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* the class. Any classes added to that package must contain
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* the same set of certificates or a <code>SecurityException</code>
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* will be thrown. Note that if the <code>name</code> argument is
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* null, this check is not performed. You should always pass in the
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* name of the class you are defining as well as the bytes. This
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* ensures that the class you are defining is indeed the class
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* you think it is.
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*
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* <p>The specified class name cannot begin with "java.", since all
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* classes in the java.* packages can only be defined by the bootstrap
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* class loader. If the name parameter is not <TT>null</TT>, it
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* must be equal to the name of the class specified by the byte
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* array b, otherwise a <TT>ClassFormatError</TT> is raised.
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*
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* @param name the expected name of the class, or <code>null</code>
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* if not known, using '.' and not '/' as the separator
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* and without a trailing ".class" suffix.
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* @param b the bytes that make up the class data. The bytes in
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* positions <code>off</code> through <code>off+len-1</code>
|
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* should have the format of a valid class file as defined
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* by the
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* <a href="http://java.sun.com/docs/books/vmspec/">Java
|
|
* Virtual Machine Specification</a>.
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|
* @param off the start offset in <code>b</code> of the class data
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* @param len the length of the class data
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* @param protectionDomain the ProtectionDomain of the class
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* @return the <code>Class</code> object created from the data,
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* and optional ProtectionDomain.
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* @exception ClassFormatError if the data did not contain a valid class
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* @exception IndexOutOfBoundsException if either <code>off</code> or
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* <code>len</code> is negative, or if
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* <code>off+len</code> is greater than <code>b.length</code>.
|
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* @exception SecurityException if an attempt is made to add this class
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|
* to a package that contains classes that were signed by
|
|
* a different set of certificates than this class, or if
|
|
* the class name begins with "java.".
|
|
*/
|
|
protected final Class defineClass(String name, byte[] b, int off, int len,
|
|
ProtectionDomain protectionDomain)
|
|
throws ClassFormatError
|
|
{
|
|
check();
|
|
if ((name != null) && name.startsWith("java.")) {
|
|
throw new SecurityException("Prohibited package name: " +
|
|
name.substring(0, name.lastIndexOf('.')));
|
|
}
|
|
if (protectionDomain == null) {
|
|
protectionDomain = getDefaultDomain();
|
|
}
|
|
|
|
if (name != null)
|
|
checkCerts(name, protectionDomain.getCodeSource());
|
|
|
|
Class c = null;
|
|
|
|
try
|
|
{
|
|
c = defineClass0(name, b, off, len, protectionDomain);
|
|
}
|
|
catch (ClassFormatError cfe)
|
|
{
|
|
// Class format error - try to transform the bytecode and
|
|
// define the class again
|
|
//
|
|
Object[] transformers = ClassFileTransformer.getTransformers();
|
|
|
|
for (int i=0; transformers != null && i < transformers.length; i++)
|
|
{
|
|
try
|
|
{
|
|
// Transform byte code using transformer
|
|
byte[] tb = ((ClassFileTransformer) transformers[i]).transform(b, off, len);
|
|
c = defineClass0(name, tb, 0, tb.length, protectionDomain);
|
|
break;
|
|
}
|
|
catch (ClassFormatError cfe2)
|
|
{
|
|
// If ClassFormatError occurs, try next transformer
|
|
}
|
|
}
|
|
|
|
// Rethrow original ClassFormatError if unable to transform
|
|
// bytecode to well-formed
|
|
//
|
|
if (c == null)
|
|
throw cfe;
|
|
}
|
|
|
|
if (protectionDomain.getCodeSource() != null) {
|
|
java.security.cert.Certificate certs[] =
|
|
protectionDomain.getCodeSource().getCertificates();
|
|
if (certs != null)
|
|
setSigners(c, certs);
|
|
}
|
|
return c;
|
|
}
|
|
|
|
private synchronized void checkCerts(String name, CodeSource cs)
|
|
{
|
|
int i = name.lastIndexOf('.');
|
|
String pname = (i == -1) ? "" : name.substring(0,i);
|
|
java.security.cert.Certificate[] pcerts =
|
|
(java.security.cert.Certificate[]) package2certs.get(pname);
|
|
if (pcerts == null) {
|
|
// first class in this package gets to define which
|
|
// certificates must be the same for all other classes
|
|
// in this package
|
|
if (cs != null) {
|
|
pcerts = cs.getCertificates();
|
|
}
|
|
if (pcerts == null) {
|
|
if (nocerts == null)
|
|
nocerts = new java.security.cert.Certificate[0];
|
|
pcerts = nocerts;
|
|
}
|
|
package2certs.put(pname, pcerts);
|
|
} else {
|
|
java.security.cert.Certificate[] certs = null;
|
|
if (cs != null) {
|
|
certs = cs.getCertificates();
|
|
}
|
|
|
|
if (!compareCerts(pcerts,certs)) {
|
|
throw new SecurityException("class \""+ name+
|
|
"\"'s signer information does not match signer information of other classes in the same package");
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* check to make sure the certs for the new class (certs) are
|
|
* the same as the certs for the first class inserted
|
|
* in the package (pcerts)
|
|
*/
|
|
private boolean compareCerts(java.security.cert.Certificate[] pcerts,
|
|
java.security.cert.Certificate[] certs)
|
|
{
|
|
// certs can be null, indicating no certs.
|
|
if ((certs == null) || (certs.length == 0)) {
|
|
return pcerts.length == 0;
|
|
}
|
|
|
|
// the length must be the same at this point
|
|
if (certs.length != pcerts.length)
|
|
return false;
|
|
|
|
// go through and make sure all the certs in one array
|
|
// are in the other and vice-versa.
|
|
boolean match;
|
|
for (int i=0; i < certs.length; i++) {
|
|
match = false;
|
|
for (int j=0; j < pcerts.length; j++) {
|
|
if (certs[i].equals(pcerts[j])) {
|
|
match = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!match) return false;
|
|
}
|
|
|
|
// now do the same for pcerts
|
|
for (int i=0; i < pcerts.length; i++) {
|
|
match = false;
|
|
for (int j=0; j < certs.length; j++) {
|
|
if (pcerts[i].equals(certs[j])) {
|
|
match = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!match) return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Links the specified class.
|
|
* This (misleadingly named) method may be used by a class loader to
|
|
* link a class. If the class <code>c</code> has already been linked,
|
|
* then this method simply returns. Otherwise, the class is linked
|
|
* as described in the "Execution" chapter of the <i>Java Language
|
|
* Specification</i>.
|
|
*
|
|
* @param c the class to link
|
|
* @exception NullPointerException if <code>c</code> is <code>null</code>.
|
|
* @see java.lang.ClassLoader#defineClass(java.lang.String,byte[],int,int)
|
|
*/
|
|
protected final void resolveClass(Class c) {
|
|
check();
|
|
resolveClass0(c);
|
|
}
|
|
|
|
/**
|
|
* Finds a class with the specified name, loading it if necessary.<p>
|
|
*
|
|
* Prior to the Java 2 SDK, this method loads a class from the local file
|
|
* system in a platform-dependent manner, and returns a class object
|
|
* that has no associated class loader.<p>
|
|
*
|
|
* Since the Java 2 SDK v1.2, this method loads the class through the
|
|
* system class loader(see {@link #getSystemClassLoader()}). Class objects
|
|
* returned might have <code>ClassLoader</code>s associated with them.
|
|
* Subclasses of <code>ClassLoader</code> need not usually call this
|
|
* method, because most class loaders need to override just {@link
|
|
* #findClass(String)}.<p>
|
|
*
|
|
* @param name the name of the class that is to be found
|
|
* @return the <code>Class</code> object for the specified
|
|
* <code>name</code>
|
|
* @exception ClassNotFoundException if the class could not be found
|
|
* @see #ClassLoader(ClassLoader)
|
|
* @see #getParent()
|
|
*/
|
|
protected final Class findSystemClass(String name)
|
|
throws ClassNotFoundException
|
|
{
|
|
check();
|
|
ClassLoader system = getSystemClassLoader();
|
|
if (system == null) {
|
|
return findBootstrapClass(name);
|
|
}
|
|
return system.loadClass(name);
|
|
}
|
|
|
|
/**
|
|
* Returns the parent class loader for delegation. Some implementations
|
|
* may use <code>null</code> to represent the bootstrap class
|
|
* loader. This method will return <code>null</code> in such
|
|
* implementations if this class loader's parent is the bootstrap
|
|
* class loader.
|
|
* <p>
|
|
* If a security manager is present, and the caller's class loader is
|
|
* not null and is not an ancestor of this class loader, then
|
|
* this method calls the security manager's <code>checkPermission</code>
|
|
* method with a <code>RuntimePermission("getClassLoader")</code>
|
|
* permission to ensure it's ok to access the parent class loader.
|
|
* If not, a <code>SecurityException</code> will be thrown.
|
|
*
|
|
* @return the parent <code>ClassLoader</code>
|
|
* @throws SecurityException
|
|
* if a security manager exists and its
|
|
* <code>checkPermission</code> method doesn't allow
|
|
* access to this class loader's parent class loader.
|
|
*
|
|
* @see SecurityManager#checkPermission
|
|
* @see java.lang.RuntimePermission
|
|
*
|
|
* @since 1.2
|
|
*/
|
|
public final ClassLoader getParent() {
|
|
if (parent == null)
|
|
return null;
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
ClassLoader ccl = getCallerClassLoader();
|
|
if (ccl != null && !isAncestor(ccl)) {
|
|
sm.checkPermission(getGetClassLoaderPerm());
|
|
}
|
|
}
|
|
return parent;
|
|
}
|
|
|
|
/**
|
|
* Sets the signers of a class. This should be called after defining a
|
|
* class.
|
|
*
|
|
* @param c the <code>Class</code> object
|
|
* @param signers the signers for the class
|
|
* @since JDK1.1
|
|
*/
|
|
protected final void setSigners(Class c, Object[] signers) {
|
|
check();
|
|
c.setSigners(signers);
|
|
}
|
|
|
|
private Class findBootstrapClass0(String name)
|
|
throws ClassNotFoundException {
|
|
check();
|
|
return findBootstrapClass(name);
|
|
}
|
|
|
|
private native Class defineClass0(String name, byte[] b, int off, int len,
|
|
ProtectionDomain pd);
|
|
private native void resolveClass0(Class c);
|
|
private native Class findBootstrapClass(String name)
|
|
throws ClassNotFoundException;
|
|
|
|
/*
|
|
* Check to make sure the class loader has been initialized.
|
|
*/
|
|
private void check() {
|
|
if (!initialized) {
|
|
throw new SecurityException("ClassLoader object not initialized");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Finds the class with the given name if it had been previously loaded
|
|
* through this class loader.
|
|
*
|
|
* @param name the class name
|
|
* @return the <code>Class</code> object, or <code>null</code> if
|
|
* the class has not been loaded
|
|
* @since JDK1.1
|
|
*/
|
|
protected native final Class findLoadedClass(String name);
|
|
|
|
/**
|
|
* Finds the resource with the given name. A resource is some data
|
|
* (images, audio, text, etc) that can be accessed by class code in a way
|
|
* that is independent of the location of the code.<p>
|
|
*
|
|
* The name of a resource is a "/"-separated path name that identifies
|
|
* the resource.<p>
|
|
*
|
|
* This method will first search the parent class loader for the resource;
|
|
* if the parent is <code>null</code> the path of the class loader
|
|
* built-in to the virtual machine is searched. That failing, this method
|
|
* will call <code>findResource</code> to find the resource.<p>
|
|
*
|
|
* @param name resource name
|
|
* @return a URL for reading the resource, or <code>null</code> if
|
|
* the resource could not be found or the caller doesn't have
|
|
* adequate privileges to get the resource.
|
|
* @since JDK1.1
|
|
* @see #findResource(String)
|
|
*/
|
|
public URL getResource(String name) {
|
|
URL url;
|
|
if (parent != null) {
|
|
url = parent.getResource(name);
|
|
} else {
|
|
url = getBootstrapResource(name);
|
|
}
|
|
if (url == null) {
|
|
url = findResource(name);
|
|
}
|
|
return url;
|
|
}
|
|
|
|
/**
|
|
* Finds all the resources with the given name. A resource is some data
|
|
* (images, audio, text, etc) that can be accessed by class code in a way
|
|
* that is independent of the location of the code.<p>
|
|
*
|
|
* The name of a resource is a "/"-separated path name that identifies the
|
|
* resource.<p>
|
|
*
|
|
* The search order is described in the documentation for {@link
|
|
* #getResource(String)}.<p>
|
|
*
|
|
* @param name resource name
|
|
* @return an enumeration of URL to the resource. If no resources could
|
|
* be found, the enumeration will be empty. Resources that the
|
|
* doesn't have access to will not be in the enumeration.
|
|
* @throws IOException if I/O errors occur
|
|
* @since 1.2
|
|
* @see #getResource
|
|
* @see #findResources
|
|
*/
|
|
public final Enumeration getResources(String name) throws IOException {
|
|
Enumeration[] tmp = new Enumeration[2];
|
|
if (parent != null) {
|
|
tmp[0] = parent.getResources(name);
|
|
} else {
|
|
tmp[0] = getBootstrapResources(name);
|
|
}
|
|
tmp[1] = findResources(name);
|
|
|
|
return new CompoundEnumeration(tmp);
|
|
}
|
|
|
|
/**
|
|
* Returns an Enumeration of URLs representing all the resources with
|
|
* the given name. Class loader implementations should override this
|
|
* method to specify where to load resources from.
|
|
*
|
|
* @param name the resource name
|
|
* @return an Enumeration of URLs for the resources
|
|
* @throws IOException if I/O errors occur
|
|
* @since 1.2
|
|
*/
|
|
protected Enumeration findResources(String name) throws IOException {
|
|
return new CompoundEnumeration(new Enumeration[0]);
|
|
}
|
|
|
|
/**
|
|
* Finds the resource with the given name. Class loader
|
|
* implementations should override this method to specify where to
|
|
* find resources.
|
|
*
|
|
* @param name the resource name
|
|
* @return a URL for reading the resource, or <code>null</code>
|
|
* if the resource could not be found
|
|
* @since 1.2
|
|
*/
|
|
protected URL findResource(String name) {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Find a resource of the specified name from the search path used to load
|
|
* classes.<p>
|
|
*
|
|
* In JDK1.1, the search path used is that of the virtual machine's
|
|
* built-in class loader.<p>
|
|
*
|
|
* Since the Java 2 SDK v1.2, this method locates the resource through the system class
|
|
* loader (see {@link #getSystemClassLoader()}).
|
|
*
|
|
* @param name the resource name
|
|
* @return a URL for reading the resource, or <code>null</code> if
|
|
* the resource could not be found
|
|
* @since JDK1.1
|
|
*/
|
|
public static URL getSystemResource(String name) {
|
|
ClassLoader system = getSystemClassLoader();
|
|
if (system == null) {
|
|
return getBootstrapResource(name);
|
|
}
|
|
return system.getResource(name);
|
|
}
|
|
|
|
/**
|
|
* Find resources from the VM's built-in classloader.
|
|
*/
|
|
private static URL getBootstrapResource(String name) {
|
|
URLClassPath ucp = getBootstrapClassPath();
|
|
Resource res = ucp.getResource(name);
|
|
return res != null ? res.getURL() : null;
|
|
}
|
|
|
|
/**
|
|
* Finds all resources of the specified name from the search path used to
|
|
* load classes. The resources thus found are returned as an
|
|
* <code>Enumeration</code> of <code>URL</code> objects. <p>
|
|
*
|
|
* The search order is described in the documentation for {@link
|
|
* #getSystemResource(String)}. <p>
|
|
*
|
|
* @param name the resource name
|
|
* @return an enumeration of resource URLs
|
|
* @throws IOException if I/O errors occur
|
|
* @since 1.2
|
|
*/
|
|
public static Enumeration getSystemResources(String name)
|
|
throws IOException
|
|
{
|
|
ClassLoader system = getSystemClassLoader();
|
|
if (system == null) {
|
|
return getBootstrapResources(name);
|
|
}
|
|
return system.getResources(name);
|
|
}
|
|
|
|
/**
|
|
* Find resources from the VM's built-in classloader.
|
|
*/
|
|
private static Enumeration getBootstrapResources(String name)
|
|
throws IOException
|
|
{
|
|
final Enumeration e = getBootstrapClassPath().getResources(name);
|
|
return new Enumeration () {
|
|
public Object nextElement() {
|
|
return ((Resource)e.nextElement()).getURL();
|
|
}
|
|
public boolean hasMoreElements() {
|
|
return e.hasMoreElements();
|
|
}
|
|
};
|
|
}
|
|
|
|
/*
|
|
* Returns the URLClassPath that is used for finding system resources.
|
|
*/
|
|
static URLClassPath getBootstrapClassPath() {
|
|
if (bootstrapClassPath == null) {
|
|
bootstrapClassPath = sun.misc.Launcher.getBootstrapClassPath();
|
|
}
|
|
return bootstrapClassPath;
|
|
}
|
|
|
|
private static URLClassPath bootstrapClassPath;
|
|
|
|
/**
|
|
* Returns an input stream for reading the specified resource.
|
|
*
|
|
* The search order is described in the documentation for {@link
|
|
* #getResource(String)}.<p>
|
|
*
|
|
* @param name the resource name
|
|
* @return an input stream for reading the resource, or <code>null</code>
|
|
* if the resource could not be found
|
|
* @since JDK1.1
|
|
*/
|
|
public InputStream getResourceAsStream(String name) {
|
|
URL url = getResource(name);
|
|
try {
|
|
return url != null ? url.openStream() : null;
|
|
} catch (IOException e) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Open for reading, a resource of the specified name from the search path
|
|
* used to load classes.<p>
|
|
*
|
|
* The search order is described in the documentation for {@link
|
|
* #getSystemResource(String)}. <p>
|
|
*
|
|
* @param name the resource name
|
|
* @return an input stream for reading the resource, or <code>null</code>
|
|
* if the resource could not be found
|
|
* @since JDK1.1
|
|
*/
|
|
public static InputStream getSystemResourceAsStream(String name) {
|
|
URL url = getSystemResource(name);
|
|
try {
|
|
return url != null ? url.openStream() : null;
|
|
} catch (IOException e) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the system class loader for delegation. This is the default
|
|
* delegation parent for new <code>ClassLoader</code> instances, and
|
|
* is typically the class loader used to start the application.
|
|
* <p>
|
|
* This method is first invoked early in the runtime's startup
|
|
* sequence, at which point it creates the system class loader
|
|
* and sets it as the context class loader of the invoking
|
|
* <tt>Thread</tt>.
|
|
* <p>
|
|
* The default system class loader is an implementation-dependent
|
|
* instance of this class.
|
|
* <p>
|
|
* If the system property <tt>java.system.class.loader</tt> is
|
|
* defined when this method is first invoked then the value of that
|
|
* property is taken to be the name of a class that will be returned as
|
|
* the system class loader. The class is loaded using the default system
|
|
* class loader and must define a public constructor that takes a single
|
|
* parameter of type <tt>ClassLoader</tt> which is used
|
|
* as the delegation parent. An instance is then created using this
|
|
* constructor with the default system class loader as the parameter.
|
|
* The resulting class loader is defined to be the system class loader.
|
|
* <p>
|
|
* If a security manager is present, and the caller's class loader is
|
|
* not null and the caller's class loader is not the same as or an ancestor of
|
|
* the system class loader, then
|
|
* this method calls the security manager's <code>checkPermission</code>
|
|
* method with a <code>RuntimePermission("getClassLoader")</code>
|
|
* permission to ensure it's ok to access the system class loader.
|
|
* If not, a <code>SecurityException</code> will be thrown.
|
|
*
|
|
* @return the system <code>ClassLoader</code> for delegation, or
|
|
* <code>null</code> if none
|
|
* @throws SecurityException
|
|
* if a security manager exists and its
|
|
* <code>checkPermission</code> method doesn't allow
|
|
* access to the system class loader.
|
|
* @throws IllegalStateException
|
|
* if invoked recursively during the construction
|
|
* of the class loader specified by the
|
|
* <code>java.system.class.loader</code> property.
|
|
* @throws Error
|
|
* if the system property <tt>java.system.class.loader</tt>
|
|
* is defined but the named class could not be loaded, the
|
|
* provider class does not define the required constructor, or an
|
|
* exception is thrown by that constructor when it is invoked. The
|
|
* underlying cause of the error can be retrieved via the
|
|
* {@link Throwable#getCause()} method.
|
|
* @see SecurityManager#checkPermission
|
|
* @see java.lang.RuntimePermission
|
|
* @revised 1.4
|
|
*/
|
|
public static ClassLoader getSystemClassLoader() {
|
|
initSystemClassLoader();
|
|
if (scl == null) {
|
|
return null;
|
|
}
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
ClassLoader ccl = getCallerClassLoader();
|
|
if (ccl != null && ccl != scl && !scl.isAncestor(ccl)) {
|
|
sm.checkPermission(getGetClassLoaderPerm());
|
|
}
|
|
}
|
|
return scl;
|
|
}
|
|
|
|
private static synchronized void initSystemClassLoader() {
|
|
if (!sclSet) {
|
|
if (scl != null)
|
|
throw new IllegalStateException("recursive call");
|
|
sun.misc.Launcher l = sun.misc.Launcher.getLauncher();
|
|
if (l != null) {
|
|
Throwable oops = null;
|
|
scl = l.getClassLoader();
|
|
try {
|
|
PrivilegedExceptionAction a;
|
|
a = new SystemClassLoaderAction(scl);
|
|
scl = (ClassLoader) AccessController.doPrivileged(a);
|
|
} catch (PrivilegedActionException pae) {
|
|
oops = pae.getCause();
|
|
if (oops instanceof InvocationTargetException) {
|
|
oops = oops.getCause();
|
|
}
|
|
}
|
|
if (oops != null) {
|
|
if (oops instanceof Error) {
|
|
throw (Error) oops;
|
|
} else {
|
|
// wrap the exception
|
|
throw new Error(oops);
|
|
}
|
|
}
|
|
}
|
|
sclSet = true;
|
|
}
|
|
}
|
|
|
|
// Returns true if the specified class loader can be found
|
|
// in this class loader's delegation chain.
|
|
boolean isAncestor(ClassLoader cl) {
|
|
ClassLoader acl = this;
|
|
do {
|
|
acl = acl.parent;
|
|
if (cl == acl) {
|
|
return true;
|
|
}
|
|
} while (acl != null);
|
|
return false;
|
|
}
|
|
|
|
// Returns the caller's class loader, or null if none.
|
|
// NOTE this must always be called when there is exactly one
|
|
// intervening frame from the core libraries on the stack between
|
|
// this method's invocation and the desired caller.
|
|
static ClassLoader getCallerClassLoader() {
|
|
// NOTE use of more generic Reflection.getCallerClass()
|
|
Class caller = Reflection.getCallerClass(3);
|
|
// This can be null if the VM is requesting it
|
|
if (caller == null) {
|
|
return null;
|
|
}
|
|
// Circumvent security check since this is package-private
|
|
return caller.getClassLoader0();
|
|
}
|
|
|
|
// The class loader for the system
|
|
private static ClassLoader scl;
|
|
|
|
// Set to true once the system class loader has been set
|
|
private static boolean sclSet;
|
|
|
|
// Permission to access system or parent class loader
|
|
private static RuntimePermission getClassLoaderPerm = null;
|
|
|
|
static RuntimePermission getGetClassLoaderPerm()
|
|
{
|
|
if (getClassLoaderPerm == null)
|
|
getClassLoaderPerm = new RuntimePermission("getClassLoader");
|
|
return getClassLoaderPerm;
|
|
}
|
|
|
|
/**
|
|
* Defines a package by name in this ClassLoader. This allows class
|
|
* loaders to define the packages for their classes. Packages must be
|
|
* created before the class is defined, and package names must be
|
|
* unique within a class loader and cannot be redefined or changed
|
|
* once created.
|
|
*
|
|
* @param name the package name
|
|
* @param specTitle the specification title
|
|
* @param specVersion the specification version
|
|
* @param specVendor the specification vendor
|
|
* @param implTitle the implementation title
|
|
* @param implVersion the implementation version
|
|
* @param implVendor the implementation vendor
|
|
* @param sealBase If not null, then this package is sealed with
|
|
* respect to the given code source URL. Otherwise,
|
|
* the package is not sealed.
|
|
* @return the newly defined <code>Package</code> object
|
|
* @exception IllegalArgumentException if package name duplicates an
|
|
* existing package either in this class loader or one of
|
|
* its ancestors
|
|
* @since 1.2
|
|
*/
|
|
protected Package definePackage(String name, String specTitle,
|
|
String specVersion, String specVendor,
|
|
String implTitle, String implVersion,
|
|
String implVendor, URL sealBase)
|
|
throws IllegalArgumentException
|
|
{
|
|
synchronized (packages) {
|
|
Package pkg = getPackage(name);
|
|
if (pkg != null) {
|
|
throw new IllegalArgumentException(name);
|
|
}
|
|
pkg = new Package(name, specTitle, specVersion, specVendor,
|
|
implTitle, implVersion, implVendor,
|
|
sealBase);
|
|
packages.put(name, pkg);
|
|
return pkg;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns a Package that has been defined by this class loader or any
|
|
* of its ancestors.
|
|
*
|
|
* @param name the package name
|
|
* @return the Package corresponding to the given name, or null if not
|
|
* found
|
|
* @since 1.2
|
|
*/
|
|
protected Package getPackage(String name) {
|
|
synchronized (packages) {
|
|
Package pkg = (Package)packages.get(name);
|
|
if (pkg == null) {
|
|
if (parent != null) {
|
|
pkg = parent.getPackage(name);
|
|
} else {
|
|
pkg = Package.getSystemPackage(name);
|
|
}
|
|
if (pkg != null) {
|
|
packages.put(name, pkg);
|
|
}
|
|
}
|
|
return pkg;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns all of the Packages defined by this class loader and its
|
|
* ancestors.
|
|
*
|
|
* @return the array of <code>Package</code> objects defined by this
|
|
* <code>ClassLoader</code>
|
|
* @since 1.2
|
|
*/
|
|
protected Package[] getPackages() {
|
|
Map map;
|
|
synchronized (packages) {
|
|
map = (Map)packages.clone();
|
|
}
|
|
Package[] pkgs;
|
|
if (parent != null) {
|
|
pkgs = parent.getPackages();
|
|
} else {
|
|
pkgs = Package.getSystemPackages();
|
|
}
|
|
if (pkgs != null) {
|
|
for (int i = 0; i < pkgs.length; i++) {
|
|
String pkgName = pkgs[i].getName();
|
|
if (map.get(pkgName) == null) {
|
|
map.put(pkgName, pkgs[i]);
|
|
}
|
|
}
|
|
}
|
|
return (Package[])map.values().toArray(new Package[map.size()]);
|
|
}
|
|
|
|
/**
|
|
* Returns the absolute path name of a native library. The VM
|
|
* invokes this method to locate the native libraries that belong
|
|
* to classes loaded with this class loader. If this method returns
|
|
* <code>null</code>, the VM searches the library along the path
|
|
* specified as the <code>java.library.path</code> property.
|
|
*
|
|
* @param libname the library name
|
|
* @return the absolute path of the native library
|
|
* @see java.lang.System#loadLibrary(java.lang.String)
|
|
* @see java.lang.System#mapLibraryName(java.lang.String)
|
|
* @since 1.2
|
|
*/
|
|
protected String findLibrary(String libname) {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* The inner class NativeLibrary denotes a loaded native library
|
|
* instance. Every classloader contains a vector of loaded native
|
|
* libraries in the private field <code>nativeLibraries</code>.
|
|
* The native libraries loaded into the system are entered into
|
|
* the <code>systemNativeLibraries</code> vector.
|
|
*
|
|
* Every native library reuqires a particular version of JNI. This
|
|
* is denoted by the private jniVersion field. This field is set
|
|
* by the VM when it loads the library, and used by the VM to pass
|
|
* the correct version of JNI to the native methods.
|
|
*
|
|
* @version 1.162, 03/19/02
|
|
* @see java.lang.ClassLoader
|
|
* @since 1.2
|
|
*/
|
|
static class NativeLibrary {
|
|
/* opaque handle to native library, used in native code. */
|
|
long handle;
|
|
/* the version of JNI environment the native library requires. */
|
|
private int jniVersion;
|
|
/* the class from which the library is loaded, also indicates
|
|
the loader this native library belongs. */
|
|
private Class fromClass;
|
|
/* the canonicalized name of the native library. */
|
|
String name;
|
|
|
|
native void load(String name);
|
|
native long find(String name);
|
|
native void unload();
|
|
|
|
public NativeLibrary(Class fromClass, String name) {
|
|
this.name = name;
|
|
this.fromClass = fromClass;
|
|
}
|
|
|
|
protected void finalize() {
|
|
synchronized (loadedLibraryNames) {
|
|
if (fromClass.getClassLoader() != null && handle != 0) {
|
|
/* remove the native library name */
|
|
int size = loadedLibraryNames.size();
|
|
for (int i = 0; i < size; i++) {
|
|
if (name.equals(loadedLibraryNames.elementAt(i))) {
|
|
loadedLibraryNames.removeElementAt(i);
|
|
break;
|
|
}
|
|
}
|
|
/* unload the library. */
|
|
ClassLoader.nativeLibraryContext.push(this);
|
|
try {
|
|
unload();
|
|
} finally {
|
|
ClassLoader.nativeLibraryContext.pop();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* Called in the VM to determine the context class in
|
|
JNI_Load/JNI_Unload */
|
|
static Class getFromClass() {
|
|
return ((NativeLibrary)
|
|
(ClassLoader.nativeLibraryContext.peek())).fromClass;
|
|
}
|
|
}
|
|
|
|
/* the "default" domain. Set as the default ProtectionDomain
|
|
* on newly created classses.
|
|
*/
|
|
private ProtectionDomain defaultDomain = null;
|
|
|
|
/*
|
|
* returns (and initializes) the default domain.
|
|
*/
|
|
|
|
private synchronized ProtectionDomain getDefaultDomain() {
|
|
if (defaultDomain == null) {
|
|
CodeSource cs = new CodeSource(null, null);
|
|
defaultDomain = new ProtectionDomain(cs, null, this, null);
|
|
}
|
|
return defaultDomain;
|
|
}
|
|
|
|
/* All native library names we've loaded. */
|
|
private static Vector loadedLibraryNames = new Vector();
|
|
/* Native libraries belonging to system classes. */
|
|
private static Vector systemNativeLibraries = new Vector();
|
|
/* Native libraries associated with the class loader. */
|
|
private Vector nativeLibraries = new Vector();
|
|
|
|
/* native libraries being loaded/unloaded. */
|
|
private static Stack nativeLibraryContext = new Stack();
|
|
|
|
/* The paths searched for libraries */
|
|
static private String usr_paths[];
|
|
static private String sys_paths[];
|
|
|
|
private static String[] initializePath(String propname) {
|
|
String ldpath = System.getProperty(propname, "");
|
|
String ps = File.pathSeparator;
|
|
int ldlen = ldpath.length();
|
|
int i, j, n;
|
|
// Count the separators in the path
|
|
i = ldpath.indexOf(ps);
|
|
n = 0;
|
|
while (i >= 0) {
|
|
n++;
|
|
i = ldpath.indexOf(ps, i+1);
|
|
}
|
|
|
|
// allocate the array of paths - n :'s = n + 1 path elements
|
|
String[] paths = new String[n + 1];
|
|
|
|
// Fill the array with paths from the ldpath
|
|
n = i = 0;
|
|
j = ldpath.indexOf(ps);
|
|
while (j >= 0) {
|
|
if (j - i > 0) {
|
|
paths[n++] = ldpath.substring(i, j);
|
|
} else if (j - i == 0) {
|
|
paths[n++] = ".";
|
|
}
|
|
i = j + 1;
|
|
j = ldpath.indexOf(ps, i);
|
|
}
|
|
paths[n] = ldpath.substring(i, ldlen);
|
|
return paths;
|
|
}
|
|
|
|
|
|
/* Called in the java.lang.Runtime class to implement load
|
|
* and loadLibrary.
|
|
*/
|
|
static void loadLibrary(Class fromClass, String name,
|
|
boolean isAbsolute) {
|
|
ClassLoader loader =
|
|
(fromClass == null) ? null : fromClass.getClassLoader();
|
|
if (sys_paths == null) {
|
|
usr_paths = initializePath("java.library.path");
|
|
sys_paths = initializePath("sun.boot.library.path");
|
|
}
|
|
if (isAbsolute) {
|
|
if (loadLibrary0(fromClass, new File(name))) {
|
|
return;
|
|
}
|
|
throw new UnsatisfiedLinkError("Can't load library: " + name);
|
|
}
|
|
if (loader != null) {
|
|
String libfilename = loader.findLibrary(name);
|
|
if (libfilename != null) {
|
|
File libfile = new File(libfilename);
|
|
if (!libfile.isAbsolute()) {
|
|
throw new UnsatisfiedLinkError(
|
|
"ClassLoader.findLibrary failed to return an absolute path: " + libfilename);
|
|
}
|
|
if (loadLibrary0(fromClass, libfile)) {
|
|
return;
|
|
}
|
|
throw new UnsatisfiedLinkError ("Can't load " + libfilename);
|
|
}
|
|
}
|
|
for (int i = 0 ; i < sys_paths.length ; i++) {
|
|
File libfile = new File(sys_paths[i], System.mapLibraryName(name));
|
|
if (loadLibrary0(fromClass, libfile)) {
|
|
return;
|
|
}
|
|
}
|
|
if (loader != null) {
|
|
for (int i = 0 ; i < usr_paths.length ; i++) {
|
|
File libfile = new File(usr_paths[i],
|
|
System.mapLibraryName(name));
|
|
if (loadLibrary0(fromClass, libfile)) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
// Oops, it failed
|
|
throw new UnsatisfiedLinkError("no " + name + " in java.library.path");
|
|
}
|
|
|
|
private static boolean loadLibrary0(Class fromClass, final File file) {
|
|
Boolean exists = (Boolean)
|
|
AccessController.doPrivileged(new PrivilegedAction() {
|
|
public Object run() {
|
|
return new Boolean(file.exists());
|
|
}
|
|
});
|
|
if (!exists.booleanValue()) {
|
|
return false;
|
|
}
|
|
String name;
|
|
try {
|
|
name = file.getCanonicalPath();
|
|
} catch (IOException e) {
|
|
return false;
|
|
}
|
|
ClassLoader loader =
|
|
(fromClass == null) ? null : fromClass.getClassLoader();
|
|
Vector libs =
|
|
loader != null ? loader.nativeLibraries : systemNativeLibraries;
|
|
synchronized (libs) {
|
|
int size = libs.size();
|
|
for (int i = 0; i < size; i++) {
|
|
NativeLibrary lib = (NativeLibrary)libs.elementAt(i);
|
|
if (name.equals(lib.name)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
synchronized (loadedLibraryNames) {
|
|
if (loadedLibraryNames.contains(name)) {
|
|
throw new UnsatisfiedLinkError
|
|
("Native Library " +
|
|
name +
|
|
" already loaded in another classloader");
|
|
}
|
|
/* If the library is being loaded (must be by
|
|
* the same thread, because Runtime.load and
|
|
* Runtime.loadLibrary are synchronous). The
|
|
* reason is can occur is that the JNI_OnLoad
|
|
* function can cause another loadLibrary call.
|
|
*
|
|
* Thus we can use a static stack to hold the list
|
|
* of libraries we are loading.
|
|
*
|
|
* If there is a pending load operation for the
|
|
* library, we immediately return success; otherwise,
|
|
* we raise UnsatisfiedLinkError.
|
|
*/
|
|
int n = nativeLibraryContext.size();
|
|
for (int i = 0; i < n; i++) {
|
|
NativeLibrary lib = (NativeLibrary)
|
|
nativeLibraryContext.elementAt(i);
|
|
if (name.equals(lib.name)) {
|
|
if (loader == lib.fromClass.getClassLoader()) {
|
|
return true;
|
|
} else {
|
|
throw new UnsatisfiedLinkError
|
|
("Native Library " +
|
|
name +
|
|
" is being loaded in another classloader");
|
|
}
|
|
}
|
|
}
|
|
NativeLibrary lib = new NativeLibrary(fromClass, name);
|
|
nativeLibraryContext.push(lib);
|
|
try {
|
|
lib.load(name);
|
|
} finally {
|
|
nativeLibraryContext.pop();
|
|
}
|
|
if (lib.handle != 0) {
|
|
loadedLibraryNames.addElement(name);
|
|
libs.addElement(lib);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Called in the VM class linking code. */
|
|
static long findNative(ClassLoader loader, String name) {
|
|
Vector libs =
|
|
loader != null ? loader.nativeLibraries : systemNativeLibraries;
|
|
synchronized (libs) {
|
|
int size = libs.size();
|
|
for (int i = 0; i < size; i++) {
|
|
NativeLibrary lib = (NativeLibrary)libs.elementAt(i);
|
|
long entry = lib.find(name);
|
|
if (entry != 0)
|
|
return entry;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The default toggle for assertion checking.
|
|
*/
|
|
private boolean defaultAssertionStatus = false;
|
|
|
|
/*
|
|
* Maps String packageName to Boolean package default assertion status
|
|
* Note that the default package is placed under a null map key.
|
|
* If this field is null then we are delegating assertion status queries
|
|
* to the VM, i.e., none of this ClassLoader's assertion status
|
|
* modification methods have been called.
|
|
*/
|
|
private Map packageAssertionStatus = null;
|
|
|
|
/*
|
|
* Maps String fullyQualifiedClassName to Boolean assertionStatus
|
|
* If this field is null then we are delegating assertion status queries
|
|
* to the VM, i.e., none of this ClassLoader's assertion status
|
|
* modification methods have been called.
|
|
*/
|
|
Map classAssertionStatus = null;
|
|
|
|
/**
|
|
* Sets the default assertion status for this class loader. This setting
|
|
* determines whether classes loaded by this class loader and initialized
|
|
* in the future will have assertions enabled or disabled by default.
|
|
* This setting may be overridden on a per-package or per-class basis by
|
|
* invoking {@link #setPackageAssertionStatus(String,boolean)} or {@link
|
|
* #setClassAssertionStatus(String,boolean)}.
|
|
*
|
|
* @param enabled <tt>true</tt> if classes loaded by this class loader
|
|
* will henceforth have assertions enabled by default,
|
|
* <tt>false</tt> if they will have assertions disabled by default.
|
|
* @since 1.4
|
|
*/
|
|
public synchronized void setDefaultAssertionStatus(boolean enabled) {
|
|
if (classAssertionStatus == null)
|
|
initializeJavaAssertionMaps();
|
|
|
|
defaultAssertionStatus = enabled;
|
|
}
|
|
|
|
/**
|
|
* Sets the package default assertion status for the named
|
|
* package. The package default assertion status determines the
|
|
* assertion status for classes initialized in the future that belong
|
|
* to the named package or any of its "subpackages."
|
|
* <p>
|
|
* A subpackage of a package named p is any package whose name
|
|
* begins with "p." . For example, <tt>javax.swing.text</tt> is
|
|
* a subpackage of <tt>javax.swing</tt>, and both <tt>java.util</tt>
|
|
* and <tt>java.lang.reflect</tt> are subpackages of <tt>java</tt>.
|
|
* <p>
|
|
* In the event that multiple package defaults apply to a given
|
|
* class, the package default pertaining to the most specific package
|
|
* takes precedence over the others. For example, if
|
|
* <tt>javax.lang</tt> and <tt>javax.lang.reflect</tt> both have
|
|
* package defaults associated with them, the latter package
|
|
* default applies to classes in <tt>javax.lang.reflect</tt>.
|
|
* <p>
|
|
* Package defaults take precedence over the class loader's default
|
|
* assertion status, and may be overridden on a per-class basis by
|
|
* invoking {@link #setClassAssertionStatus(String,boolean)}.
|
|
*
|
|
* @param packageName the name of the package whose package default
|
|
* assertion status is to be set. A null value
|
|
* indicates the unnamed package that is "current"
|
|
* (JLS 7.4.2).
|
|
* @param enabled <tt>true</tt> if classes loaded by this classloader
|
|
* and belonging to the named package or any of its subpackages
|
|
* will have assertions enabled by default, <tt>false</tt> if they
|
|
* will have assertions disabled by default.
|
|
* @since 1.4
|
|
*/
|
|
public synchronized void setPackageAssertionStatus(String packageName,
|
|
boolean enabled)
|
|
{
|
|
if (packageAssertionStatus == null)
|
|
initializeJavaAssertionMaps();
|
|
|
|
packageAssertionStatus.put(packageName, Boolean.valueOf(enabled));
|
|
}
|
|
|
|
/**
|
|
* Sets the desired assertion status for the named top-level class in
|
|
* this class loader and any nested classes contained therein.
|
|
* This setting takes precedence over the class loader's default
|
|
* assertion status, and over any applicable per-package default.
|
|
* This method has no effect if the named class has already been
|
|
* initialized. (Once a class is initialized, its assertion status cannot
|
|
* change.)
|
|
* <p>
|
|
* If the named class is not a top-level class, this call will have no
|
|
* effect on the actual assertion status of any class, and its return
|
|
* value is undefined.
|
|
*
|
|
* @param className the fully qualified class name of the top-level class
|
|
* whose assertion status is to be set.
|
|
* @param enabled <tt>true</tt> if the named class is to have assertions
|
|
* enabled when (and if) it is initialized, <tt>false</tt> if the
|
|
* class is to have assertions disabled.
|
|
* @since 1.4
|
|
*/
|
|
public synchronized void setClassAssertionStatus(String className,
|
|
boolean enabled)
|
|
{
|
|
if (classAssertionStatus == null)
|
|
initializeJavaAssertionMaps();
|
|
|
|
classAssertionStatus.put(className, Boolean.valueOf(enabled));
|
|
}
|
|
|
|
/**
|
|
* Sets the default assertion status for this class loader to
|
|
* <tt>false</tt> and discards any package defaults or class assertion
|
|
* status settings associated with the class loader. This call is
|
|
* provided so that class loaders can be made to ignore any command line
|
|
* or persistent assertion status settings and "start with a clean slate."
|
|
*
|
|
* @since 1.4
|
|
*/
|
|
public synchronized void clearAssertionStatus() {
|
|
/*
|
|
* Whether or not "Java assertion maps" are initialized, set
|
|
* them to empty maps, effectively ignoring any present settings.
|
|
*/
|
|
classAssertionStatus = new HashMap();
|
|
packageAssertionStatus = new HashMap();
|
|
|
|
defaultAssertionStatus = false;
|
|
}
|
|
|
|
/**
|
|
* Returns the assertion status that would be assigned to the specified
|
|
* class if it were to be initialized at the time this method is invoked.
|
|
* If the named class has had its assertion status set, the most recent
|
|
* setting will be returned; otherwise, if any package default assertion
|
|
* status pertains to this class, the most recent setting for the most
|
|
* specific pertinent package default assertion status is returned;
|
|
* otherwise, this class loader's default assertion status is returned.
|
|
*
|
|
* @param className the fully qualified class name of the class whose
|
|
* desired assertion status is being queried.
|
|
* @return the desired assertion status of the specified class.
|
|
* @see #setClassAssertionStatus(String,boolean)
|
|
* @see #setPackageAssertionStatus(String,boolean)
|
|
* @see #setDefaultAssertionStatus(boolean)
|
|
* @since 1.4
|
|
*/
|
|
synchronized boolean desiredAssertionStatus(String className) {
|
|
Boolean result;
|
|
|
|
// assert classAssertionStatus != null;
|
|
// assert packageAssertionStatus != null;
|
|
|
|
// Check for a class entry
|
|
result = (Boolean)classAssertionStatus.get(className);
|
|
if (result != null)
|
|
return result.booleanValue();
|
|
|
|
// Check for most specific package entry
|
|
int dotIndex = className.lastIndexOf(".");
|
|
if (dotIndex < 0) { // default package
|
|
result = (Boolean)packageAssertionStatus.get(null);
|
|
if (result != null)
|
|
return result.booleanValue();
|
|
}
|
|
while(dotIndex > 0) {
|
|
className = className.substring(0, dotIndex);
|
|
result = (Boolean)packageAssertionStatus.get(className);
|
|
if (result != null)
|
|
return result.booleanValue();
|
|
dotIndex = className.lastIndexOf(".", dotIndex-1);
|
|
}
|
|
|
|
// Return the classloader default
|
|
return defaultAssertionStatus;
|
|
}
|
|
|
|
// Set up the assertions with information provided by the VM.
|
|
private void initializeJavaAssertionMaps() {
|
|
// assert Thread.holdsLock(this);
|
|
|
|
classAssertionStatus = new HashMap();
|
|
packageAssertionStatus = new HashMap();
|
|
AssertionStatusDirectives directives = retrieveDirectives();
|
|
|
|
for(int i=0; i<directives.classes.length; i++)
|
|
classAssertionStatus.put(directives.classes[i],
|
|
Boolean.valueOf(directives.classEnabled[i]));
|
|
|
|
for(int i=0; i<directives.packages.length; i++)
|
|
packageAssertionStatus.put(directives.packages[i],
|
|
Boolean.valueOf(directives.packageEnabled[i]));
|
|
|
|
defaultAssertionStatus = directives.deflt;
|
|
}
|
|
|
|
// Retrieves the assertion directives from the VM.
|
|
private static native AssertionStatusDirectives retrieveDirectives();
|
|
|
|
}
|
|
|
|
|
|
class SystemClassLoaderAction implements PrivilegedExceptionAction {
|
|
private ClassLoader parent;
|
|
|
|
SystemClassLoaderAction(ClassLoader parent) {
|
|
this.parent = parent;
|
|
}
|
|
|
|
public Object run() throws Exception {
|
|
ClassLoader sys;
|
|
Constructor ctor;
|
|
Class c;
|
|
Class cp[] = { ClassLoader.class };
|
|
Object params[] = { parent };
|
|
|
|
String cls = System.getProperty("java.system.class.loader");
|
|
if (cls == null) {
|
|
return parent;
|
|
}
|
|
|
|
c = Class.forName(cls, true, parent);
|
|
ctor = c.getDeclaredConstructor(cp);
|
|
sys = (ClassLoader) ctor.newInstance(params);
|
|
Thread.currentThread().setContextClassLoader(sys);
|
|
return sys;
|
|
}
|
|
}
|