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/*******************************************************************************
* Copyright (c) 2003, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.loader;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashSet;
import org.eclipse.osgi.framework.adaptor.BundleData;
import org.eclipse.osgi.framework.internal.core.BundleFragment;
import org.eclipse.osgi.framework.internal.core.BundleHost;
import org.eclipse.osgi.service.resolver.ExportPackageDescription;
import org.osgi.framework.BundleException;
/**
* The System Bundle's BundleLoader. This BundleLoader is used by ImportClassLoaders
* to load a resource that is exported by the System Bundle.
*/
public class SystemBundleLoader extends BundleLoader {
public static final String EQUINOX_EE = "x-equinox-ee"; //$NON-NLS-1$
private final ClassLoader classLoader;
private final HashSet eePackages;
private final HashSet extPackages;
private final ClassLoader extClassLoader;
/**
* @param bundle The system bundle.
* @param proxy The BundleLoaderProxy for the system bundle
* @throws BundleException On any error.
*/
protected SystemBundleLoader(BundleHost bundle, BundleLoaderProxy proxy) throws BundleException {
super(bundle, proxy);
ExportPackageDescription[] exports = proxy.getBundleDescription().getSelectedExports();
if (exports == null || exports.length == 0)
eePackages = null;
else {
eePackages = new HashSet(exports.length);
for (int i = 0; i < exports.length; i++)
if (((Integer) exports[i].getDirective(EQUINOX_EE)).intValue() >= 0)
eePackages.add(exports[i].getName());
}
this.classLoader = getClass().getClassLoader();
extPackages = new HashSet(0); // not common; start with 0
BundleFragment[] fragments = bundle.getFragments();
if (fragments != null)
for (int i = 0; i < fragments.length; i++)
addExtPackages(fragments[i]);
ClassLoader extCL = ClassLoader.getSystemClassLoader();
if (extCL == null)
extClassLoader = null;
else {
while (extCL.getParent() != null)
extCL = extCL.getParent();
// make sure extCL is not already on the parent chain of the system classloader
boolean found = false;
ClassLoader systemExtCL = this.classLoader;
while (systemExtCL.getParent() != null && !found) {
if (systemExtCL.getParent() == extCL)
found = true;
else
systemExtCL = systemExtCL.getParent();
}
extClassLoader = found ? null : extCL;
}
}
private void addExtPackages(BundleFragment fragment) {
if ((fragment.getBundleData().getType() & BundleData.TYPE_EXTCLASSPATH_EXTENSION) == 0)
return;
ExportPackageDescription[] extExports = fragment.getBundleDescription().getExportPackages();
for (int j = 0; j < extExports.length; j++)
extPackages.add(extExports[j].getName());
}
synchronized public void attachFragment(BundleFragment fragment) throws BundleException {
super.attachFragment(fragment);
synchronized (extPackages) {
addExtPackages(fragment);
}
}
/**
* The ClassLoader that loads OSGi framework classes is used to find the class.
* This method never gets called because there is no BundleClassLoader for the framework.
*/
public Class findClass(String name) throws ClassNotFoundException {
Class result = findLocalClass(name);
if (result == null)
throw new ClassNotFoundException(name);
return result;
}
/**
* This method will always return null.
* This method never gets called because there is no BundleClassLoader for the framework.
*/
public String findLibrary(String name) {
return null;
}
/**
* The ClassLoader that loads OSGi framework classes is used to find the class.
*/
Class findLocalClass(String name) {
try {
return classLoader.loadClass(name);
} catch (ClassNotFoundException e) {
if (extClassLoader != null)
synchronized (extPackages) {
if (extPackages.size() > 0 && extPackages.contains(BundleLoader.getPackageName(name)))
try {
return extClassLoader.loadClass(name);
} catch (ClassNotFoundException e2) {
return null;
}
}
}
return null;
}
/**
* The ClassLoader that loads OSGi framework classes is used to find the resource.
*/
URL findLocalResource(String name) {
URL result = classLoader.getResource(name);
if (result == null && extClassLoader != null)
synchronized (extPackages) {
if (extPackages.size() > 0 && extPackages.contains(BundleLoader.getResourcePackageName(name)))
result = extClassLoader.getResource(name);
}
return result;
}
/**
* The ClassLoader that loads OSGi framework classes is used to find the resource.
*/
Enumeration findLocalResources(String name) {
Enumeration result = null;
try {
result = classLoader.getResources(name);
} catch (IOException e) {
// do nothing
}
if ((result == null || !result.hasMoreElements()) && extClassLoader != null)
synchronized (extPackages) {
if (extPackages.size() > 0 && extPackages.contains(BundleLoader.getResourcePackageName(name)))
try {
result = extClassLoader.getResources(name);
} catch (IOException e) {
// do nothing
}
}
return result;
}
/**
* The ClassLoader that loads OSGi framework classes is used to find the resource.
* This method never gets called because there is no BundleClassLoader for the framework.
*/
public URL findResource(String name) {
return findLocalResource(name);
}
/**
* The ClassLoader that loads OSGi framework classes is used to find the resource.
* This method never gets called because there is no BundleClassLoader for the framework.
*/
public Enumeration findResources(String name) throws IOException {
return findLocalResources(name);
}
/**
* Do nothing on a close.
*/
protected synchronized void close() {
// Do nothing.
}
public boolean isEEPackage(String pkgName) {
return eePackages.contains(pkgName);
}
}
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