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/*******************************************************************************
* Copyright (c) 2008, 2014 Martin Lippert and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Martin Lippert initial implementation
* Martin Lippert fragment handling fixed
*******************************************************************************/
package org.eclipse.equinox.weaving.hooks;
import java.io.FileNotFoundException;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.equinox.service.weaving.ISupplementerRegistry;
import org.eclipse.equinox.service.weaving.Supplementer;
import org.eclipse.osgi.internal.hookregistry.ClassLoaderHook;
import org.eclipse.osgi.internal.loader.ModuleClassLoader;
import org.osgi.framework.Bundle;
/**
* This class implements the delegate hook for the class loader to allow
* supplemented bundles find types and resources from theirs supplementer
* bundles
*
* This works together with the supplementer registry to handle the
* supplementing mechanism. The supplementer registry controls which bundle is
* supplemented by which other bundle. This hook implementation uses this
* information to broaden type and resource visibility according to the
* supplementer registry information.
*/
public class WeavingLoaderDelegateHook extends ClassLoaderHook {
private final ThreadLocal<Set<String>> postFindClassCalls = new ThreadLocal<Set<String>>() {
@Override
protected Set<String> initialValue() {
return new HashSet<String>();
}
};
private final ThreadLocal<Set<String>> postFindResourceCalls = new ThreadLocal<Set<String>>() {
@Override
protected Set<String> initialValue() {
return new HashSet<String>();
}
};
private final ThreadLocal<Set<String>> postFindResourcesCalls = new ThreadLocal<Set<String>>() {
@Override
protected Set<String> initialValue() {
return new HashSet<String>();
}
};
private final ISupplementerRegistry supplementerRegistry;
/**
* Create the hook instance for broaden the visibility according to the
* supplementing mechansism.
*
* @param supplementerRegistry The supplementer registry to be used by this
* hook for information retrieval which bundles are supplemented
* by which other bundles (needs to not be null)
*/
public WeavingLoaderDelegateHook(
final ISupplementerRegistry supplementerRegistry) {
this.supplementerRegistry = supplementerRegistry;
}
/**
*
* @see org.eclipse.osgi.internal.hookregistry.ClassLoaderHook#postFindClass(java.lang.String,
* org.eclipse.osgi.internal.loader.ModuleClassLoader)
*/
@Override
public Class<?> postFindClass(final String name,
final ModuleClassLoader classLoader) throws ClassNotFoundException {
final long bundleID = classLoader.getBundle().getBundleId();
final String callKey = bundleID + name;
if (postFindClassCalls.get().contains(callKey)) {
return null;
}
postFindClassCalls.get().add(callKey);
try {
final Supplementer[] supplementers = supplementerRegistry
.getSupplementers(bundleID);
if (supplementers != null) {
for (int i = 0; i < supplementers.length; i++) {
try {
final Bundle bundle = supplementers[i]
.getSupplementerHost();
if (bundle.getState() != Bundle.UNINSTALLED) {
final Class<?> clazz = bundle.loadClass(name);
if (clazz != null) {
return clazz;
}
}
} catch (final ClassNotFoundException e) {
}
}
}
} finally {
postFindClassCalls.get().remove(callKey);
}
return null;
}
/**
*
* @see org.eclipse.osgi.internal.hookregistry.ClassLoaderHook#postFindResource(java.lang.String,
* org.eclipse.osgi.internal.loader.ModuleClassLoader)
*/
@Override
public URL postFindResource(final String name,
final ModuleClassLoader classLoader) throws FileNotFoundException {
final long bundleID = classLoader.getBundle().getBundleId();
final String callKey = bundleID + name;
if (postFindResourceCalls.get().contains(callKey)) {
return null;
}
postFindResourceCalls.get().add(callKey);
try {
final Supplementer[] supplementers = supplementerRegistry
.getSupplementers(bundleID);
if (supplementers != null) {
for (int i = 0; i < supplementers.length; i++) {
try {
final URL resource = supplementers[i]
.getSupplementerHost().getResource(name);
if (resource != null) {
return resource;
}
} catch (final Exception e) {
e.printStackTrace();
}
}
}
} finally {
postFindResourceCalls.get().remove(callKey);
}
return null;
}
/**
*
* @see org.eclipse.osgi.internal.hookregistry.ClassLoaderHook#postFindResources(java.lang.String,
* org.eclipse.osgi.internal.loader.ModuleClassLoader)
*/
@Override
public Enumeration<URL> postFindResources(final String name,
final ModuleClassLoader classLoader) throws FileNotFoundException {
final long bundleID = classLoader.getBundle().getBundleId();
final String callKey = bundleID + name;
if (postFindResourcesCalls.get().contains(callKey)) {
return null;
}
postFindResourcesCalls.get().add(callKey);
try {
final Supplementer[] supplementers = supplementerRegistry
.getSupplementers(bundleID);
if (supplementers != null) {
for (int i = 0; i < supplementers.length; i++) {
try {
final Enumeration<URL> resource = supplementers[i]
.getSupplementerHost().getResources(name);
if (resource != null) {
// TODO: if more than one enumeration is found, we should return all items
return resource;
}
} catch (final Exception e) {
e.printStackTrace();
}
}
}
} finally {
postFindResourcesCalls.get().remove(callKey);
}
return null;
}
}
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