java-impl

java/java-impl/src/com/intellij/openapi/roots/libraries/LibrariesHelperImpl.java

@@ -0,0 +1,55 @@
+package com.intellij.openapi.roots.libraries;
+
+import com.intellij.openapi.roots.OrderRootType;
+import com.intellij.openapi.vfs.JarFileSystem;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.openapi.vfs.VirtualFileManager;
+import com.intellij.util.text.StringTokenizer;
+import org.jetbrains.annotations.NonNls;
+
+/**
+ * author: lesya
+ */
+public class LibrariesHelperImpl extends LibrariesHelper {
+
+  @Override
+  public VirtualFile findJarByClass(Library library, @NonNls String fqn) {
+    return library == null ? null : findJarByClass(library.getFiles(OrderRootType.CLASSES), fqn);
+  }
+
+  private VirtualFile findJarByClass(VirtualFile[] files, String fqn) {
+    for (VirtualFile file : files) {
+      if (findInFile(file, new StringTokenizer(fqn, "."))) return file;
+    }
+    return null;
+  }
+
+  public boolean isClassAvailableInLibrary(Library library, String fqn) {
+    final String[] urls = library.getUrls(OrderRootType.CLASSES);
+    return isClassAvailable(urls, fqn);
+  }
+
+  public boolean isClassAvailable(final String[] urls, String fqn) {
+    for (String url : urls) {
+      VirtualFile file = VirtualFileManager.getInstance().findFileByUrl(url);
+      if (file == null) continue;
+      if (!(file.getFileSystem() instanceof JarFileSystem) && !file.isDirectory()) {
+        file = JarFileSystem.getInstance().findFileByPath(file.getPath() + JarFileSystem.JAR_SEPARATOR);
+      }
+      if (file == null) continue;
+      if (findInFile(file, new StringTokenizer(fqn, "."))) return true;
+    }
+    return false;
+  }
+
+  private static boolean findInFile(VirtualFile root, final StringTokenizer filePath) {
+    if (!filePath.hasMoreTokens()) return true;
+    @NonNls String name = filePath.nextToken();
+    if (!filePath.hasMoreTokens()) {
+      name += ".class";
+    }
+    final VirtualFile child = root.findChild(name);
+    return child != null && findInFile(child, filePath);
+  }
+
+}