/*
* Copyright 2000-2007 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.util.lang;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.Nullable;
import sun.misc.Resource;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.*;
public class UrlClassLoader extends ClassLoader {
private final ClassPath myClassPath;
private final List<URL> myURLs;
@NonNls static final String CLASS_EXTENSION = ".class";
protected static boolean myDebugTime = false;
protected static final long NS_THRESHOLD = 10000000;
public UrlClassLoader(ClassLoader parent) {
this(Arrays.asList(((URLClassLoader)parent).getURLs()), null, true, true);
}
public UrlClassLoader(List<URL> urls, ClassLoader parent) {
this(urls, parent, false, false);
}
public UrlClassLoader(URL[] urls, ClassLoader parent) {
this(Arrays.asList(urls), parent, false, false);
}
public UrlClassLoader(List<URL> urls, ClassLoader parent, boolean canLockJars, boolean canUseCache) {
super(parent);
myClassPath = new ClassPath(urls.toArray(new URL[urls.size()]), canLockJars, canUseCache);
myURLs = new ArrayList<URL>(urls);
}
public void addURL(URL url) {
myClassPath.addURL(url);
myURLs.add(url);
}
public List<URL> getUrls() {
return Collections.unmodifiableList(myURLs);
}
protected Class findClass(final String name) throws ClassNotFoundException {
Resource res = myClassPath.getResource(name.replace('.', '/').concat(CLASS_EXTENSION), false);
if (res == null) {
throw new ClassNotFoundException(name);
}
try {
return defineClass(name, res);
}
catch (IOException e) {
throw new ClassNotFoundException(name, e);
}
}
protected final synchronized Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {
Class c = _loadClass(name, resolve);
if (c == null) throw new ClassNotFoundException(name);
return c;
}
@Nullable
public Class _loadClass(final String name, final boolean resolve) {
try {
return super.loadClass(name, resolve);
}
catch (ClassNotFoundException e) {
return null;
}
}
@Nullable
protected Class _findClass(final String name) {
Resource res = myClassPath.getResource(name.replace('.', '/').concat(CLASS_EXTENSION), false);
if (res == null) {
return null;
}
try {
return defineClass(name, res);
}
catch (IOException e) {
return null;
}
}
private Class defineClass(String name, Resource res) throws IOException {
int i = name.lastIndexOf('.');
if (i != -1) {
String pkgname = name.substring(0, i);
// Check if package already loaded.
Package pkg = getPackage(pkgname);
if (pkg == null) {
try {
definePackage(pkgname, null, null, null, null, null, null, null);
}
catch (IllegalArgumentException e) {
// do nothing, package already defined by some other thread
}
}
}
byte[] b = res.getBytes();
return _defineClass(name, b);
}
protected Class _defineClass(final String name, final byte[] b) {
return defineClass(name, b, 0, b.length);
}
@Nullable
public URL findResource(final String name) {
final long started = myDebugTime ? System.nanoTime():0;
try {
return findResourceImpl(name);
} finally {
long doneFor = myDebugTime ? (System.nanoTime() - started):0;
if (doneFor > NS_THRESHOLD) {
System.out.println((doneFor / 1000000) + " ms for UrlClassLoader.getResource, resource:"+name);
}
}
}
protected URL findResourceImpl(final String name) {
Resource res = _getResource(name);
if (res == null) return null;
return res.getURL();
}
@Nullable
private Resource _getResource(final String name) {
String n = name;
if (n.startsWith("/")) n = n.substring(1);
return myClassPath.getResource(n, true);
}
@Nullable
@Override
public InputStream getResourceAsStream(final String name) {
try {
Resource res = _getResource(name);
if (res == null) return null;
return res.getInputStream();
}
catch (IOException e) {
return null;
}
}
protected Enumeration<URL> findResources(String name) throws IOException {
return myClassPath.getResources(name, true);
}
}