org.netbeans.ProxyURLStreamHandlerFactory Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.netbeans;
import java.lang.reflect.Field;
import java.net.URL;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.openide.util.Lookup;
import org.openide.util.LookupEvent;
import org.openide.util.LookupListener;
/**
* A stream handler factory that delegates to others in lookup.
*/
public class ProxyURLStreamHandlerFactory implements URLStreamHandlerFactory, LookupListener {
private static final Logger LOG = Logger.getLogger(ProxyURLStreamHandlerFactory.class.getName());
private static boolean proxyFactoryInitialized;
private static URLStreamHandler originalJarHandler;
public static synchronized void register() {
LOG.log(Level.FINE, "register: {0}", proxyFactoryInitialized); // NOI18N
LOG.log(Level.FINER, null, new Exception("Initialized by")); // NOI18N
if (!proxyFactoryInitialized) {
if (!ProxyURLStreamHandlerFactory.class.getClassLoader().getClass().getName().equals("com.sun.jnlp.JNLPClassLoader")) { // #196970
try {
List candidates = new ArrayList();
for (Field f : URL.class.getDeclaredFields()) {
if (f.getType() == URLStreamHandler.class) {
candidates.add(f);
}
}
if (candidates.size() != 1) {
throw new Exception("No, or multiple, URLStreamHandler-valued fields in URL: " + candidates);
}
Field f = candidates.get(0);
f.setAccessible(true);
originalJarHandler = (URLStreamHandler) f.get(new URL("jar:file:/sample.jar!/"));
LOG.log(Level.FINE, "found originalJarHandler: {0}", originalJarHandler);
} catch (Throwable t) {
if (originalJarHandler == null) {
LOG.log(Level.SEVERE, "No way to find original stream handler for jar protocol", t); // NOI18N
}
}
}
try {
URL.setURLStreamHandlerFactory(new ProxyURLStreamHandlerFactory(null));
} catch (Error e) {
LOG.log(Level.CONFIG, "Problems registering URLStreamHandlerFactory, trying reflection", e); // NOI18N
try {
URLStreamHandlerFactory prev = null;
for (Field f : URL.class.getDeclaredFields()) {
LOG.log(Level.FINEST, "Found field {0}", f);
if (f.getType() == URLStreamHandlerFactory.class) {
LOG.log(Level.FINEST, "Clearing field {0}");
f.setAccessible(true);
prev = (URLStreamHandlerFactory) f.get(null);
LOG.log(Level.CONFIG, "Previous value was {0}", prev);
f.set(null, null);
LOG.config("Field is supposed to be empty");
break;
}
}
if (prev != null && prev.getClass().getName().equals(ProxyURLStreamHandlerFactory.class.getName())) {
prev = null;
}
URL.setURLStreamHandlerFactory(new ProxyURLStreamHandlerFactory(prev));
} catch (Throwable t) {
LOG.log(Level.SEVERE, "No way to register URLStreamHandlerFactory; NetBeans is unlikely to work", t); // NOI18N
}
}
proxyFactoryInitialized = true;
}
}
static URLStreamHandler originalJarHandler() {
return originalJarHandler;
}
private final URLStreamHandlerFactory delegate;
private Lookup.Result r;
private URLStreamHandlerFactory[] handlers;
private ProxyURLStreamHandlerFactory(URLStreamHandlerFactory delegate) {
this.delegate = delegate;
LOG.log(Level.FINE, "new ProxyURLStreamHandlerFactory. delegate={0} originalJarHandler={1}", new Object[]{delegate, originalJarHandler});
}
@Override
public URLStreamHandler createURLStreamHandler(String protocol) {
if (protocol.equals("jar")) {
return originalJarHandler != null ? new JarClassLoader.JarURLStreamHandler(originalJarHandler) : null;
} else if (protocol.equals("file") || protocol.equals("http") || protocol.equals("https") || protocol.equals("resource")) { // NOI18N
// Well-known handlers in JRE. Do not try to initialize lookup, etc.
// (delegate already ignores these, but we cannot afford to look for URLSHFs in default lookup either.)
return null;
} else {
if (delegate != null) {
URLStreamHandler h = delegate.createURLStreamHandler(protocol);
if (h != null) {
return h;
}
}
URLStreamHandlerFactory[] _handlers;
synchronized (this) {
if (handlers == null) {
r = Lookup.getDefault().lookupResult(URLStreamHandlerFactory.class);
r.addLookupListener(this);
resultChanged(null);
}
_handlers = handlers;
}
for (URLStreamHandlerFactory f : _handlers) {
URLStreamHandler h = f.createURLStreamHandler(protocol);
if (h != null) {
return h;
}
}
return null;
}
}
@Override
public void resultChanged(LookupEvent ev) {
Collection c = r.allInstances();
synchronized (this) {
handlers = c.toArray(new URLStreamHandlerFactory[c.size()]);
}
}
}