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lazy init for NIO-related reflection stuff

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This commit is contained in:
Eugene Zhuravlev
2015-03-12 13:35:26 +01:00
parent d642e2fde6
commit d6acba346a
2 changed files with 74 additions and 74 deletions
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platform/util-rt/src/com/intellij/openapi/util/io/FileUtilRt.java
+73 -73
View File
@@ -69,85 +69,85 @@ public class FileUtilRt {
private static String ourCanonicalTempPathCache = null;
protected static final boolean NIO_FILE_API_AVAILABLE;
protected static final class NIOReflect {
// NIO-reflection initialization placed in a separate class for lazy loading
static final boolean IS_AVAILABLE;
// todo: replace reflection with normal code after migration to JDK 1.8
private static Method ourFilesDeleteIfExistsMethod;
private static Method ourFilesWalkMethod;
private static Method ourFileToPathMethod;
private static Object ourDeletionVisitor;
private static Class ourNoSuchFileExceptionClass;
static {
boolean initSuccess = false;
try {
final Class<?> pathClass = Class.forName("java.nio.file.Path");
final Class<?> visitorClass = Class.forName("java.nio.file.FileVisitor");
final Class<?> filesClass = Class.forName("java.nio.file.Files");
ourNoSuchFileExceptionClass = Class.forName("java.nio.file.NoSuchFileException");
// todo: replace reflection with normal code after migration to JDK 1.8
private static Method ourFilesDeleteIfExistsMethod;
private static Method ourFilesWalkMethod;
private static Method ourFileToPathMethod;
private static Object ourDeletionVisitor;
private static Class ourNoSuchFileExceptionClass;
ourFileToPathMethod = Class.forName("java.io.File").getMethod("toPath");
ourFilesWalkMethod = filesClass.getMethod("walkFileTree", pathClass, visitorClass);
ourFilesDeleteIfExistsMethod = filesClass.getMethod("deleteIfExists", pathClass);
final Class<?> fileVisitResultClass = Class.forName("java.nio.file.FileVisitResult");
final Object Result_Continue = fileVisitResultClass.getDeclaredField("CONTINUE").get(null);
final Object Result_Terminate = fileVisitResultClass.getDeclaredField("TERMINATE").get(null);
ourDeletionVisitor = Proxy.newProxyInstance(FileUtilRt.class.getClassLoader(), new Class[]{visitorClass}, new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (args.length == 2) {
final Object second = args[1];
if (second instanceof Throwable) {
throw (Throwable)second;
}
final String methodName = method.getName();
if ("visitFile".equals(methodName) || "postVisitDirectory".equals(methodName)) {
if (!performDelete(args[0])) {
return Result_Terminate;
static {
boolean initSuccess = false;
try {
final Class<?> pathClass = Class.forName("java.nio.file.Path");
final Class<?> visitorClass = Class.forName("java.nio.file.FileVisitor");
final Class<?> filesClass = Class.forName("java.nio.file.Files");
ourNoSuchFileExceptionClass = Class.forName("java.nio.file.NoSuchFileException");
ourFileToPathMethod = Class.forName("java.io.File").getMethod("toPath");
ourFilesWalkMethod = filesClass.getMethod("walkFileTree", pathClass, visitorClass);
ourFilesDeleteIfExistsMethod = filesClass.getMethod("deleteIfExists", pathClass);
final Class<?> fileVisitResultClass = Class.forName("java.nio.file.FileVisitResult");
final Object Result_Continue = fileVisitResultClass.getDeclaredField("CONTINUE").get(null);
final Object Result_Terminate = fileVisitResultClass.getDeclaredField("TERMINATE").get(null);
ourDeletionVisitor = Proxy.newProxyInstance(FileUtilRt.class.getClassLoader(), new Class[]{visitorClass}, new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (args.length == 2) {
final Object second = args[1];
if (second instanceof Throwable) {
throw (Throwable)second;
}
}
}
return Result_Continue;
}
private boolean performDelete(@NotNull final Object fileObject) {
Boolean result = doIOOperation(new RepeatableIOOperation<Boolean, RuntimeException>() {
public Boolean execute(boolean lastAttempt) {
try {
//Files.deleteIfExists(file);
ourFilesDeleteIfExistsMethod.invoke(null, fileObject);
return Boolean.TRUE;
}
catch (InvocationTargetException e) {
if (!(e.getCause() instanceof IOException)) {
return Boolean.FALSE;
final String methodName = method.getName();
if ("visitFile".equals(methodName) || "postVisitDirectory".equals(methodName)) {
if (!performDelete(args[0])) {
return Result_Terminate;
}
}
catch (IllegalAccessException e) {
return Boolean.FALSE;
}
return lastAttempt? Boolean.FALSE : null;
}
});
return Boolean.TRUE.equals(result);
}
return Result_Continue;
}
});
initSuccess = true;
private boolean performDelete(@NotNull final Object fileObject) {
Boolean result = doIOOperation(new RepeatableIOOperation<Boolean, RuntimeException>() {
public Boolean execute(boolean lastAttempt) {
try {
//Files.deleteIfExists(file);
ourFilesDeleteIfExistsMethod.invoke(null, fileObject);
return Boolean.TRUE;
}
catch (InvocationTargetException e) {
if (!(e.getCause() instanceof IOException)) {
return Boolean.FALSE;
}
}
catch (IllegalAccessException e) {
return Boolean.FALSE;
}
return lastAttempt ? Boolean.FALSE : null;
}
});
return Boolean.TRUE.equals(result);
}
});
initSuccess = true;
}
catch (Throwable ignored) {
logger().info("Was not able to detect NIO API");
ourFileToPathMethod = null;
ourFilesWalkMethod = null;
ourFilesDeleteIfExistsMethod = null;
ourDeletionVisitor = null;
ourNoSuchFileExceptionClass = null;
}
IS_AVAILABLE = initSuccess;
}
catch (Throwable ignored) {
//noinspection UseOfSystemOutOrSystemErr
System.err.println("INFO: was not able to detect NIO API");
ourFileToPathMethod = null;
ourFilesWalkMethod = null;
ourFilesDeleteIfExistsMethod = null;
ourDeletionVisitor = null;
ourNoSuchFileExceptionClass = null;
}
NIO_FILE_API_AVAILABLE = initSuccess;
}
@NotNull
public static String getExtension(@NotNull String fileName) {
int index = fileName.lastIndexOf('.');
@@ -619,7 +619,7 @@ public class FileUtilRt {
* @return true if the file did not exist or was successfully deleted
*/
public static boolean delete(@NotNull File file) {
if (NIO_FILE_API_AVAILABLE) {
if (NIOReflect.IS_AVAILABLE) {
return deleteRecursivelyNIO(file);
}
return deleteRecursively(file);
@@ -642,12 +642,12 @@ public class FileUtilRt {
}
});
*/
final Object pathObject = ourFileToPathMethod.invoke(file);
ourFilesWalkMethod.invoke(null, pathObject, ourDeletionVisitor);
final Object pathObject = NIOReflect.ourFileToPathMethod.invoke(file);
NIOReflect.ourFilesWalkMethod.invoke(null, pathObject, NIOReflect.ourDeletionVisitor);
}
catch (InvocationTargetException e) {
final Throwable cause = e.getCause();
if (cause == null || !ourNoSuchFileExceptionClass.isInstance(cause)) {
if (cause == null || !NIOReflect.ourNoSuchFileExceptionClass.isInstance(cause)) {
logger().info(e);
return false;
}
platform/util/src/com/intellij/openapi/util/io/FileUtil.java
+1 -1
View File
@@ -421,7 +421,7 @@ public class FileUtil extends FileUtilRt {
}
public static boolean delete(@NotNull File file) {
if (NIO_FILE_API_AVAILABLE) {
if (NIOReflect.IS_AVAILABLE) {
return deleteRecursivelyNIO(file);
}
return deleteRecursively(file);