bundles/org.eclipse.osgi/eclipseAdaptor/src/org/eclipse/core/runtime/adaptor/EclipseClassLoader.java - gerrit/equinox/rt.equinox.framework - Git at Google

 /*******************************************************************************
  * Copyright (c) 2003, 2005 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.core.runtime.adaptor;

 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
 import java.security.ProtectionDomain;
 import java.util.ArrayList;
 import java.util.StringTokenizer;
 import java.util.jar.Attributes;
 import java.util.jar.Manifest;
 import org.eclipse.osgi.framework.adaptor.*;
 import org.eclipse.osgi.framework.adaptor.core.*;
 import org.eclipse.osgi.framework.internal.core.AbstractBundle;
 import org.eclipse.osgi.framework.internal.core.Msg;
 import org.eclipse.osgi.framework.internal.defaultadaptor.DefaultClassLoader;
 import org.eclipse.osgi.framework.internal.defaultadaptor.DevClassPathHelper;
 import org.eclipse.osgi.framework.log.FrameworkLogEntry;
 import org.eclipse.osgi.framework.stats.*;
 import org.eclipse.osgi.util.NLS;
 import org.osgi.framework.*;

 /**
  * Internal class.
  */
 public class EclipseClassLoader extends DefaultClassLoader {
 	private static String[] NL_JAR_VARIANTS = buildNLJarVariants(EnvironmentInfo.getDefault().getNL());
 	private static boolean DEFINE_PACKAGES;
 	private static final String VARIABLE_DELIM_STRING = "$"; //$NON-NLS-1$
 	private static final char VARIABLE_DELIM_CHAR = '$';
 	private static final String EXTERNAL_LIB_PREFIX = "external:"; //$NON-NLS-1$
 	static {
 		try {
 			Class.forName("java.lang.Package"); //$NON-NLS-1$
 			DEFINE_PACKAGES = true;
 		} catch (ClassNotFoundException e) {
 			DEFINE_PACKAGES = false;
 		}
 	}

 	public EclipseClassLoader(ClassLoaderDelegate delegate, ProtectionDomain domain, String[] classpath, ClassLoader parent, BundleData bundleData) {
 		super(delegate, domain, classpath, parent, (EclipseBundleData) bundleData);
 	}

 	public Class findLocalClass(String className) throws ClassNotFoundException {
 		if (StatsManager.MONITOR_CLASSES) //Suport for performance analysis
 			ClassloaderStats.startLoadingClass(getClassloaderId(), className);
 		boolean found = true;

 		try {
 			AbstractBundle bundle = (AbstractBundle) hostdata.getBundle();
 			// If the bundle is active, uninstalled or stopping then the bundle has already
 			// been initialized (though it may have been destroyed) so just return the class.
 			if ((bundle.getState() & (Bundle.ACTIVE | Bundle.UNINSTALLED | Bundle.STOPPING)) != 0)
 				return basicFindLocalClass(className);

 			// The bundle is not active and does not require activation, just return the class
 			if (!shouldActivateFor(className))
 				return basicFindLocalClass(className);

 			// The bundle is starting.  Note that if the state changed between the tests
 			// above and this test (e.g., it was not ACTIVE but now is), that's ok, we will
 			// just try to start it again (else case).
 			// TODO need an explanation here of why we duplicated the mechanism
 			// from the framework rather than just calling start() and letting it sort it out.
 			if (bundle.getState() == Bundle.STARTING) {
 				// If the thread trying to load the class is the one trying to activate the bundle, then return the class
 				if (bundle.testStateChanging(Thread.currentThread()) || bundle.testStateChanging(null))
 					return basicFindLocalClass(className);

 				// If it's another thread, we wait and try again. In any case the class is returned.
 				// The difference is that an exception can be logged.
 				// TODO do we really need this test?  We just did it on the previous line?
 				if (!bundle.testStateChanging(Thread.currentThread())) {
 					Thread threadChangingState = bundle.getStateChanging();
 					if (StatsManager.TRACE_BUNDLES && threadChangingState != null) {
 						System.out.println("Concurrent startup of bundle " + bundle.getSymbolicName() + " by " + Thread.currentThread() + " and " + threadChangingState.getName() + ". Waiting up to 5000ms for " + threadChangingState + " to finish the initialization."); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
 					}
 					long start = System.currentTimeMillis();
 					long delay = 5000;
 					long timeLeft = delay;
 					while (true) {
 						try {
 							Thread.sleep(100); // do not release the classloader lock (bug 86713)
 							if (bundle.testStateChanging(null) || timeLeft <= 0)
 								break;
 						} catch (InterruptedException e) {
 							//Ignore and keep waiting
 						}
 						timeLeft = start + delay - System.currentTimeMillis();
 					}
 					if (timeLeft <= 0 || bundle.getState() != Bundle.ACTIVE) {
 						String bundleName = bundle.getSymbolicName() == null ? Long.toString(bundle.getBundleId()) : bundle.getSymbolicName();
 						String message = NLS.bind(EclipseAdaptorMsg.ECLIPSE_CLASSLOADER_CONCURRENT_STARTUP, new Object[] {Thread.currentThread().getName(), className, threadChangingState.getName(), bundleName, Long.toString(delay)});
 						EclipseAdaptor.getDefault().getFrameworkLog().log(new FrameworkLogEntry(FrameworkAdaptor.FRAMEWORK_SYMBOLICNAME, message, 0, new Exception(EclipseAdaptorMsg.ECLIPSE_CLASSLOADER_GENERATED_EXCEPTION), null));
 					}
 					return basicFindLocalClass(className);
 				}
 			}

 			//The bundle must be started.
 			try {
 				hostdata.getBundle().start();
 			} catch (BundleException e) {
 				String message = NLS.bind(EclipseAdaptorMsg.ECLIPSE_CLASSLOADER_ACTIVATION, bundle.getSymbolicName(), Long.toString(bundle.getBundleId())); //$NON-NLS-1$
 				EclipseAdaptor.getDefault().getFrameworkLog().log(new FrameworkLogEntry(FrameworkAdaptor.FRAMEWORK_SYMBOLICNAME, message, 0, e, null));
 				throw new ClassNotFoundException(className, e);
 			}
 			return basicFindLocalClass(className);
 		} catch (ClassNotFoundException e) {
 			found = false;
 			throw e;
 		} finally {
 			if (StatsManager.MONITOR_CLASSES)
 				ClassloaderStats.endLoadingClass(getClassloaderId(), className, found);
 		}
 	}

 	/**
 	 * Do the basic work for finding a class. This avoids the activation detection etc
 	 * and can be used by subclasses to override the default (from the superclass)
 	 * way of finding classes.
 	 * @param name the class to look for
 	 * @return the found class
 	 * @throws ClassNotFoundException if the requested class cannot be found
 	 */
 	protected Class basicFindLocalClass(String name) throws ClassNotFoundException {
 		return super.findLocalClass(name);
 	}

 	/**
 	 * Determines if for loading the given class we should activate the bundle.
 	 */
 	private boolean shouldActivateFor(String className) throws ClassNotFoundException {
 		//Don't reactivate on shut down
 		if (hostdata.getAdaptor().isStopping()) {
 			BundleStopper stopper = EclipseAdaptor.getDefault().getBundleStopper();
 			if (stopper != null && stopper.isStopped(hostdata.getBundle())) {
 				String message = NLS.bind(EclipseAdaptorMsg.ECLIPSE_CLASSLOADER_ALREADY_STOPPED, className, hostdata.getSymbolicName());
 				throw new ClassNotFoundException(message);
 			}
 		}
 		boolean autoStart = ((EclipseBundleData) hostdata).isAutoStart();
 		String[] autoStartExceptions = ((EclipseBundleData) hostdata).getAutoStartExceptions();
 		// no exceptions, it is easy to figure it out
 		if (autoStartExceptions == null)
 			return autoStart;
 		// otherwise, we need to check if the package is in the exceptions list
 		int dotPosition = className.lastIndexOf('.');
 		// the class has no package name... no exceptions apply
 		if (dotPosition == -1)
 			return autoStart;
 		String packageName = className.substring(0, dotPosition);
 		// should activate if autoStart and package is not an exception, or if !autoStart and package is exception
 		return autoStart ^ contains(autoStartExceptions, packageName);
 	}

 	private boolean contains(String[] array, String element) {
 		for (int i = 0; i < array.length; i++)
 			if (array[i].equals(element))
 				return true;
 		return false;
 	}

 	/**
 	 * Override defineClass to allow for package defining.
 	 */
 	protected Class defineClass(String name, byte[] classbytes, int off, int len, ClasspathEntry classpathEntry) throws ClassFormatError {
 		if (!DEFINE_PACKAGES)
 			return super.defineClass(name, classbytes, off, len, classpathEntry);

 		// Define the package if it is not the default package.
 		int lastIndex = name.lastIndexOf('.');
 		if (lastIndex != -1) {
 			String packageName = name.substring(0, lastIndex);
 			Package pkg = getPackage(packageName);
 			if (pkg == null) {
 				// get info about the package from the classpath entry's manifest.
 				String specTitle = null, specVersion = null, specVendor = null, implTitle = null, implVersion = null, implVendor = null;
 				Manifest mf = ((EclipseClasspathEntry) classpathEntry).getManifest();
 				if (mf != null) {
 					Attributes mainAttributes = mf.getMainAttributes();
 					String dirName = packageName.replace('.', '/') + '/';
 					Attributes packageAttributes = mf.getAttributes(dirName);
 					boolean noEntry = false;
 					if (packageAttributes == null) {
 						noEntry = true;
 						packageAttributes = mainAttributes;
 					}
 					specTitle = packageAttributes.getValue(Attributes.Name.SPECIFICATION_TITLE);
 					if (specTitle == null && !noEntry)
 						specTitle = mainAttributes.getValue(Attributes.Name.SPECIFICATION_TITLE);
 					specVersion = packageAttributes.getValue(Attributes.Name.SPECIFICATION_VERSION);
 					if (specVersion == null && !noEntry)
 						specVersion = mainAttributes.getValue(Attributes.Name.SPECIFICATION_VERSION);
 					specVendor = packageAttributes.getValue(Attributes.Name.SPECIFICATION_VENDOR);
 					if (specVendor == null && !noEntry)
 						specVendor = mainAttributes.getValue(Attributes.Name.SPECIFICATION_VENDOR);
 					implTitle = packageAttributes.getValue(Attributes.Name.IMPLEMENTATION_TITLE);
 					if (implTitle == null && !noEntry)
 						implTitle = mainAttributes.getValue(Attributes.Name.IMPLEMENTATION_TITLE);
 					implVersion = packageAttributes.getValue(Attributes.Name.IMPLEMENTATION_VERSION);
 					if (implVersion == null && !noEntry)
 						implVersion = mainAttributes.getValue(Attributes.Name.IMPLEMENTATION_VERSION);
 					implVendor = packageAttributes.getValue(Attributes.Name.IMPLEMENTATION_VENDOR);
 					if (implVendor == null && !noEntry)
 						implVendor = mainAttributes.getValue(Attributes.Name.IMPLEMENTATION_VENDOR);
 				}
 				// The package is not defined yet define it before we define the class.
 				// TODO still need to seal packages.
 				definePackage(packageName, specTitle, specVersion, specVendor, implTitle, implVersion, implVendor, null);
 			}
 		}
 		return super.defineClass(name, classbytes, off, len, classpathEntry);
 	}

 	private String getClassloaderId() {
 		return hostdata.getBundle().getSymbolicName();
 	}

 	public URL getResource(String name) {
 		URL result = super.getResource(name);
 		if (StatsManager.MONITOR_RESOURCES) {
 			if (result != null && name.endsWith(".properties")) { //$NON-NLS-1$
 				ClassloaderStats.loadedBundle(getClassloaderId(), new ResourceBundleStats(getClassloaderId(), name, result));
 			}
 		}
 		return result;
 	}

 	protected void findClassPathEntry(ArrayList result, String entry, AbstractBundleData bundledata, ProtectionDomain domain) {
 		String var = hasPrefix(entry);
 		if (var != null) {
 			// find internal library using eclipse predefined vars
 			findInternalClassPath(var, result, entry, bundledata, domain);
 			return;
 		}
 		if (entry.startsWith(EXTERNAL_LIB_PREFIX)) {
 			entry = entry.substring(EXTERNAL_LIB_PREFIX.length());
 			// find external library using system property substitution
 			ClasspathEntry cpEntry = getExternalClassPath(substituteVars(entry), bundledata, domain);
 			if (cpEntry != null)
 				result.add(cpEntry);
 			return;
 		}
 		// if we get here just do the default searching
 		super.findClassPathEntry(result, entry, bundledata, domain);
 	}

 	private void findInternalClassPath(String var, ArrayList result, String entry, AbstractBundleData bundledata, ProtectionDomain domain) {
 		if (var.equals("ws")) { //$NON-NLS-1$
 			super.findClassPathEntry(result, "ws/" + EnvironmentInfo.getDefault().getWS() + entry.substring(4), bundledata, domain); //$NON-NLS-1$
 			return;
 		}
 		if (var.equals("os")) { //$NON-NLS-1$
 			super.findClassPathEntry(result, "os/" + EnvironmentInfo.getDefault().getOS() + entry.substring(4), bundledata, domain); //$NON-NLS-1$
 			return;
 		}
 		if (var.equals("nl")) { //$NON-NLS-1$
 			entry = entry.substring(4);
 			for (int i = 0; i < NL_JAR_VARIANTS.length; i++) {
 				if (addClassPathEntry(result, "nl/" + NL_JAR_VARIANTS[i] + entry, bundledata, domain)) //$NON-NLS-1$ //$NON-NLS-2$
 					return;
 			}
 			// is we are not in development mode, post some framework errors.
 			if (!DevClassPathHelper.inDevelopmentMode()) {
 				//BundleException be = new BundleException(Msg.formatter.getString("BUNDLE_CLASSPATH_ENTRY_NOT_FOUND_EXCEPTION", entry, hostdata.getLocation())); //$NON-NLS-1$
 				BundleException be = new BundleException(NLS.bind(Msg.BUNDLE_CLASSPATH_ENTRY_NOT_FOUND_EXCEPTION, entry)); //$NON-NLS-1$
 				bundledata.getAdaptor().getEventPublisher().publishFrameworkEvent(FrameworkEvent.ERROR, bundledata.getBundle(), be);
 			}
 		}
 	}

 	private static String[] buildNLJarVariants(String nl) {
 		ArrayList result = new ArrayList();
 		nl = nl.replace('_', '/');
 		while (nl.length() > 0) {
 			result.add("nl/" + nl + "/"); //$NON-NLS-1$ //$NON-NLS-2$
 			int i = nl.lastIndexOf('/'); //$NON-NLS-1$
 			nl = (i < 0) ? "" : nl.substring(0, i); //$NON-NLS-1$
 		}
 		result.add(""); //$NON-NLS-1$
 		return (String[]) result.toArray(new String[result.size()]);
 	}

 	//return a String representing the string found between the $s
 	private String hasPrefix(String libPath) {
 		if (libPath.startsWith("$ws$")) //$NON-NLS-1$
 			return "ws"; //$NON-NLS-1$
 		if (libPath.startsWith("$os$")) //$NON-NLS-1$
 			return "os"; //$NON-NLS-1$
 		if (libPath.startsWith("$nl$")) //$NON-NLS-1$
 			return "nl"; //$NON-NLS-1$
 		return null;
 	}

 	private String substituteVars(String cp) {
 		StringBuffer buf = new StringBuffer(cp.length());
 		StringTokenizer st = new StringTokenizer(cp, VARIABLE_DELIM_STRING, true);
 		boolean varStarted = false; // indicates we are processing a var subtitute
 		String var = null; // the current var key
 		while (st.hasMoreElements()) {
 			String tok = st.nextToken();
 			if (VARIABLE_DELIM_STRING.equals(tok)) {
 				if (!varStarted) {
 					varStarted = true; // we found the start of a var
 					var = ""; //$NON-NLS-1$
 				} else {
 					// we have found the end of a var
 					String prop = null;
 					// get the value of the var from system properties
 					if (var != null && var.length() > 0)
 						prop = System.getProperty(var);
 					if (prop != null)
 						// found a value; use it
 						buf.append(prop);
 					else
 						// could not find a value append the var name w/o delims
 						buf.append(var == null ? "" : var); //$NON-NLS-1$
 					varStarted = false;
 					var = null;
 				}
 			} else {
 				if (!varStarted)
 					buf.append(tok); // the token is not part of a var
 				else
 					var = tok; // the token is the var key; save the key to process when we find the end token
 			}
 		}
 		if (var != null)
 			// found a case of $var at the end of the cp with no trailing $; just append it as is.
 			buf.append(VARIABLE_DELIM_CHAR).append(var);
 		return buf.toString();
 	}

 	/**
 	 * Override to create EclipseClasspathEntry objects.  EclipseClasspathEntry
 	 * allows access to the manifest file for the classpath entry.
 	 */
 	protected ClasspathEntry createClassPathEntry(BundleFile bundlefile, ProtectionDomain domain) {
 		return new EclipseClasspathEntry(bundlefile, domain);
 	}

 	/**
 	 * A ClasspathEntry that has a manifest associated with it.
 	 */
 	protected class EclipseClasspathEntry extends ClasspathEntry {
 		Manifest mf;
 		boolean initMF = false;

 		protected EclipseClasspathEntry(BundleFile bundlefile, ProtectionDomain domain) {
 			super(bundlefile, domain);
 		}

 		public Manifest getManifest() {
 			if (initMF)
 				return mf;

 			BundleEntry mfEntry = getBundleFile().getEntry(org.eclipse.osgi.framework.internal.core.Constants.OSGI_BUNDLE_MANIFEST);
 			if (mfEntry != null)
 				try {
 					InputStream manIn = mfEntry.getInputStream();
 					mf = new Manifest(manIn);
 					manIn.close();
 				} catch (IOException e) {
 					// do nothing
 				}
 			initMF = true;
 			return mf;
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2003, 2005 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.core.runtime.adaptor;

	import java.io.IOException;
	import java.io.InputStream;
	import java.net.URL;
	import java.security.ProtectionDomain;
	import java.util.ArrayList;
	import java.util.StringTokenizer;
	import java.util.jar.Attributes;
	import java.util.jar.Manifest;
	import org.eclipse.osgi.framework.adaptor.*;
	import org.eclipse.osgi.framework.adaptor.core.*;
	import org.eclipse.osgi.framework.internal.core.AbstractBundle;
	import org.eclipse.osgi.framework.internal.core.Msg;
	import org.eclipse.osgi.framework.internal.defaultadaptor.DefaultClassLoader;
	import org.eclipse.osgi.framework.internal.defaultadaptor.DevClassPathHelper;
	import org.eclipse.osgi.framework.log.FrameworkLogEntry;
	import org.eclipse.osgi.framework.stats.*;
	import org.eclipse.osgi.util.NLS;
	import org.osgi.framework.*;

	/**
	* Internal class.
	*/
	public class EclipseClassLoader extends DefaultClassLoader {
	private static String[] NL_JAR_VARIANTS = buildNLJarVariants(EnvironmentInfo.getDefault().getNL());
	private static boolean DEFINE_PACKAGES;
	private static final String VARIABLE_DELIM_STRING = "$"; //$NON-NLS-1$
	private static final char VARIABLE_DELIM_CHAR = '$';
	private static final String EXTERNAL_LIB_PREFIX = "external:"; //$NON-NLS-1$
	static {
	try {
	Class.forName("java.lang.Package"); //$NON-NLS-1$
	DEFINE_PACKAGES = true;
	} catch (ClassNotFoundException e) {
	DEFINE_PACKAGES = false;
	}
	}

	public EclipseClassLoader(ClassLoaderDelegate delegate, ProtectionDomain domain, String[] classpath, ClassLoader parent, BundleData bundleData) {
	super(delegate, domain, classpath, parent, (EclipseBundleData) bundleData);
	}

	public Class findLocalClass(String className) throws ClassNotFoundException {
	if (StatsManager.MONITOR_CLASSES) //Suport for performance analysis
	ClassloaderStats.startLoadingClass(getClassloaderId(), className);
	boolean found = true;

	try {
	AbstractBundle bundle = (AbstractBundle) hostdata.getBundle();
	// If the bundle is active, uninstalled or stopping then the bundle has already
	// been initialized (though it may have been destroyed) so just return the class.
	if ((bundle.getState() & (Bundle.ACTIVE \| Bundle.UNINSTALLED \| Bundle.STOPPING)) != 0)
	return basicFindLocalClass(className);

	// The bundle is not active and does not require activation, just return the class
	if (!shouldActivateFor(className))
	return basicFindLocalClass(className);

	// The bundle is starting. Note that if the state changed between the tests
	// above and this test (e.g., it was not ACTIVE but now is), that's ok, we will
	// just try to start it again (else case).
	// TODO need an explanation here of why we duplicated the mechanism
	// from the framework rather than just calling start() and letting it sort it out.
	if (bundle.getState() == Bundle.STARTING) {
	// If the thread trying to load the class is the one trying to activate the bundle, then return the class
	if (bundle.testStateChanging(Thread.currentThread()) \|\| bundle.testStateChanging(null))
	return basicFindLocalClass(className);

	// If it's another thread, we wait and try again. In any case the class is returned.
	// The difference is that an exception can be logged.
	// TODO do we really need this test? We just did it on the previous line?
	if (!bundle.testStateChanging(Thread.currentThread())) {
	Thread threadChangingState = bundle.getStateChanging();
	if (StatsManager.TRACE_BUNDLES && threadChangingState != null) {
	System.out.println("Concurrent startup of bundle " + bundle.getSymbolicName() + " by " + Thread.currentThread() + " and " + threadChangingState.getName() + ". Waiting up to 5000ms for " + threadChangingState + " to finish the initialization."); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
	}
	long start = System.currentTimeMillis();
	long delay = 5000;
	long timeLeft = delay;
	while (true) {
	try {
	Thread.sleep(100); // do not release the classloader lock (bug 86713)
	if (bundle.testStateChanging(null) \|\| timeLeft <= 0)
	break;
	} catch (InterruptedException e) {
	//Ignore and keep waiting
	}
	timeLeft = start + delay - System.currentTimeMillis();
	}
	if (timeLeft <= 0 \|\| bundle.getState() != Bundle.ACTIVE) {
	String bundleName = bundle.getSymbolicName() == null ? Long.toString(bundle.getBundleId()) : bundle.getSymbolicName();
	String message = NLS.bind(EclipseAdaptorMsg.ECLIPSE_CLASSLOADER_CONCURRENT_STARTUP, new Object[] {Thread.currentThread().getName(), className, threadChangingState.getName(), bundleName, Long.toString(delay)});
	EclipseAdaptor.getDefault().getFrameworkLog().log(new FrameworkLogEntry(FrameworkAdaptor.FRAMEWORK_SYMBOLICNAME, message, 0, new Exception(EclipseAdaptorMsg.ECLIPSE_CLASSLOADER_GENERATED_EXCEPTION), null));
	}
	return basicFindLocalClass(className);
	}
	}

	//The bundle must be started.
	try {
	hostdata.getBundle().start();
	} catch (BundleException e) {
	String message = NLS.bind(EclipseAdaptorMsg.ECLIPSE_CLASSLOADER_ACTIVATION, bundle.getSymbolicName(), Long.toString(bundle.getBundleId())); //$NON-NLS-1$
	EclipseAdaptor.getDefault().getFrameworkLog().log(new FrameworkLogEntry(FrameworkAdaptor.FRAMEWORK_SYMBOLICNAME, message, 0, e, null));
	throw new ClassNotFoundException(className, e);
	}
	return basicFindLocalClass(className);
	} catch (ClassNotFoundException e) {
	found = false;
	throw e;
	} finally {
	if (StatsManager.MONITOR_CLASSES)
	ClassloaderStats.endLoadingClass(getClassloaderId(), className, found);
	}
	}

	/**
	* Do the basic work for finding a class. This avoids the activation detection etc
	* and can be used by subclasses to override the default (from the superclass)
	* way of finding classes.
	* @param name the class to look for
	* @return the found class
	* @throws ClassNotFoundException if the requested class cannot be found
	*/
	protected Class basicFindLocalClass(String name) throws ClassNotFoundException {
	return super.findLocalClass(name);
	}

	/**
	* Determines if for loading the given class we should activate the bundle.
	*/
	private boolean shouldActivateFor(String className) throws ClassNotFoundException {
	//Don't reactivate on shut down
	if (hostdata.getAdaptor().isStopping()) {
	BundleStopper stopper = EclipseAdaptor.getDefault().getBundleStopper();
	if (stopper != null && stopper.isStopped(hostdata.getBundle())) {
	String message = NLS.bind(EclipseAdaptorMsg.ECLIPSE_CLASSLOADER_ALREADY_STOPPED, className, hostdata.getSymbolicName());
	throw new ClassNotFoundException(message);
	}
	}
	boolean autoStart = ((EclipseBundleData) hostdata).isAutoStart();
	String[] autoStartExceptions = ((EclipseBundleData) hostdata).getAutoStartExceptions();
	// no exceptions, it is easy to figure it out
	if (autoStartExceptions == null)
	return autoStart;
	// otherwise, we need to check if the package is in the exceptions list
	int dotPosition = className.lastIndexOf('.');
	// the class has no package name... no exceptions apply
	if (dotPosition == -1)
	return autoStart;
	String packageName = className.substring(0, dotPosition);
	// should activate if autoStart and package is not an exception, or if !autoStart and package is exception
	return autoStart ^ contains(autoStartExceptions, packageName);
	}

	private boolean contains(String[] array, String element) {
	for (int i = 0; i < array.length; i++)
	if (array[i].equals(element))
	return true;
	return false;
	}

	/**
	* Override defineClass to allow for package defining.
	*/
	protected Class defineClass(String name, byte[] classbytes, int off, int len, ClasspathEntry classpathEntry) throws ClassFormatError {
	if (!DEFINE_PACKAGES)
	return super.defineClass(name, classbytes, off, len, classpathEntry);

	// Define the package if it is not the default package.
	int lastIndex = name.lastIndexOf('.');
	if (lastIndex != -1) {
	String packageName = name.substring(0, lastIndex);
	Package pkg = getPackage(packageName);
	if (pkg == null) {
	// get info about the package from the classpath entry's manifest.
	String specTitle = null, specVersion = null, specVendor = null, implTitle = null, implVersion = null, implVendor = null;
	Manifest mf = ((EclipseClasspathEntry) classpathEntry).getManifest();
	if (mf != null) {
	Attributes mainAttributes = mf.getMainAttributes();
	String dirName = packageName.replace('.', '/') + '/';
	Attributes packageAttributes = mf.getAttributes(dirName);
	boolean noEntry = false;
	if (packageAttributes == null) {
	noEntry = true;
	packageAttributes = mainAttributes;
	}
	specTitle = packageAttributes.getValue(Attributes.Name.SPECIFICATION_TITLE);
	if (specTitle == null && !noEntry)
	specTitle = mainAttributes.getValue(Attributes.Name.SPECIFICATION_TITLE);
	specVersion = packageAttributes.getValue(Attributes.Name.SPECIFICATION_VERSION);
	if (specVersion == null && !noEntry)
	specVersion = mainAttributes.getValue(Attributes.Name.SPECIFICATION_VERSION);
	specVendor = packageAttributes.getValue(Attributes.Name.SPECIFICATION_VENDOR);
	if (specVendor == null && !noEntry)
	specVendor = mainAttributes.getValue(Attributes.Name.SPECIFICATION_VENDOR);
	implTitle = packageAttributes.getValue(Attributes.Name.IMPLEMENTATION_TITLE);
	if (implTitle == null && !noEntry)
	implTitle = mainAttributes.getValue(Attributes.Name.IMPLEMENTATION_TITLE);
	implVersion = packageAttributes.getValue(Attributes.Name.IMPLEMENTATION_VERSION);
	if (implVersion == null && !noEntry)
	implVersion = mainAttributes.getValue(Attributes.Name.IMPLEMENTATION_VERSION);
	implVendor = packageAttributes.getValue(Attributes.Name.IMPLEMENTATION_VENDOR);
	if (implVendor == null && !noEntry)
	implVendor = mainAttributes.getValue(Attributes.Name.IMPLEMENTATION_VENDOR);
	}
	// The package is not defined yet define it before we define the class.
	// TODO still need to seal packages.
	definePackage(packageName, specTitle, specVersion, specVendor, implTitle, implVersion, implVendor, null);
	}
	}
	return super.defineClass(name, classbytes, off, len, classpathEntry);
	}

	private String getClassloaderId() {
	return hostdata.getBundle().getSymbolicName();
	}

	public URL getResource(String name) {
	URL result = super.getResource(name);
	if (StatsManager.MONITOR_RESOURCES) {
	if (result != null && name.endsWith(".properties")) { //$NON-NLS-1$
	ClassloaderStats.loadedBundle(getClassloaderId(), new ResourceBundleStats(getClassloaderId(), name, result));
	}
	}
	return result;
	}

	protected void findClassPathEntry(ArrayList result, String entry, AbstractBundleData bundledata, ProtectionDomain domain) {
	String var = hasPrefix(entry);
	if (var != null) {
	// find internal library using eclipse predefined vars
	findInternalClassPath(var, result, entry, bundledata, domain);
	return;
	}
	if (entry.startsWith(EXTERNAL_LIB_PREFIX)) {
	entry = entry.substring(EXTERNAL_LIB_PREFIX.length());
	// find external library using system property substitution
	ClasspathEntry cpEntry = getExternalClassPath(substituteVars(entry), bundledata, domain);
	if (cpEntry != null)
	result.add(cpEntry);
	return;
	}
	// if we get here just do the default searching
	super.findClassPathEntry(result, entry, bundledata, domain);
	}

	private void findInternalClassPath(String var, ArrayList result, String entry, AbstractBundleData bundledata, ProtectionDomain domain) {
	if (var.equals("ws")) { //$NON-NLS-1$
	super.findClassPathEntry(result, "ws/" + EnvironmentInfo.getDefault().getWS() + entry.substring(4), bundledata, domain); //$NON-NLS-1$
	return;
	}
	if (var.equals("os")) { //$NON-NLS-1$
	super.findClassPathEntry(result, "os/" + EnvironmentInfo.getDefault().getOS() + entry.substring(4), bundledata, domain); //$NON-NLS-1$
	return;
	}
	if (var.equals("nl")) { //$NON-NLS-1$
	entry = entry.substring(4);
	for (int i = 0; i < NL_JAR_VARIANTS.length; i++) {
	if (addClassPathEntry(result, "nl/" + NL_JAR_VARIANTS[i] + entry, bundledata, domain)) //$NON-NLS-1$ //$NON-NLS-2$
	return;
	}
	// is we are not in development mode, post some framework errors.
	if (!DevClassPathHelper.inDevelopmentMode()) {
	//BundleException be = new BundleException(Msg.formatter.getString("BUNDLE_CLASSPATH_ENTRY_NOT_FOUND_EXCEPTION", entry, hostdata.getLocation())); //$NON-NLS-1$
	BundleException be = new BundleException(NLS.bind(Msg.BUNDLE_CLASSPATH_ENTRY_NOT_FOUND_EXCEPTION, entry)); //$NON-NLS-1$
	bundledata.getAdaptor().getEventPublisher().publishFrameworkEvent(FrameworkEvent.ERROR, bundledata.getBundle(), be);
	}
	}
	}

	private static String[] buildNLJarVariants(String nl) {
	ArrayList result = new ArrayList();
	nl = nl.replace('_', '/');
	while (nl.length() > 0) {
	result.add("nl/" + nl + "/"); //$NON-NLS-1$ //$NON-NLS-2$
	int i = nl.lastIndexOf('/'); //$NON-NLS-1$
	nl = (i < 0) ? "" : nl.substring(0, i); //$NON-NLS-1$
	}
	result.add(""); //$NON-NLS-1$
	return (String[]) result.toArray(new String[result.size()]);
	}

	//return a String representing the string found between the $s
	private String hasPrefix(String libPath) {
	if (libPath.startsWith("$ws$")) //$NON-NLS-1$
	return "ws"; //$NON-NLS-1$
	if (libPath.startsWith("$os$")) //$NON-NLS-1$
	return "os"; //$NON-NLS-1$
	if (libPath.startsWith("$nl$")) //$NON-NLS-1$
	return "nl"; //$NON-NLS-1$
	return null;
	}

	private String substituteVars(String cp) {
	StringBuffer buf = new StringBuffer(cp.length());
	StringTokenizer st = new StringTokenizer(cp, VARIABLE_DELIM_STRING, true);
	boolean varStarted = false; // indicates we are processing a var subtitute
	String var = null; // the current var key
	while (st.hasMoreElements()) {
	String tok = st.nextToken();
	if (VARIABLE_DELIM_STRING.equals(tok)) {
	if (!varStarted) {
	varStarted = true; // we found the start of a var
	var = ""; //$NON-NLS-1$
	} else {
	// we have found the end of a var
	String prop = null;
	// get the value of the var from system properties
	if (var != null && var.length() > 0)
	prop = System.getProperty(var);
	if (prop != null)
	// found a value; use it
	buf.append(prop);
	else
	// could not find a value append the var name w/o delims
	buf.append(var == null ? "" : var); //$NON-NLS-1$
	varStarted = false;
	var = null;
	}
	} else {
	if (!varStarted)
	buf.append(tok); // the token is not part of a var
	else
	var = tok; // the token is the var key; save the key to process when we find the end token
	}
	}
	if (var != null)
	// found a case of $var at the end of the cp with no trailing $; just append it as is.
	buf.append(VARIABLE_DELIM_CHAR).append(var);
	return buf.toString();
	}

	/**
	* Override to create EclipseClasspathEntry objects. EclipseClasspathEntry
	* allows access to the manifest file for the classpath entry.
	*/
	protected ClasspathEntry createClassPathEntry(BundleFile bundlefile, ProtectionDomain domain) {
	return new EclipseClasspathEntry(bundlefile, domain);
	}

	/**
	* A ClasspathEntry that has a manifest associated with it.
	*/
	protected class EclipseClasspathEntry extends ClasspathEntry {
	Manifest mf;
	boolean initMF = false;

	protected EclipseClasspathEntry(BundleFile bundlefile, ProtectionDomain domain) {
	super(bundlefile, domain);
	}

	public Manifest getManifest() {
	if (initMF)
	return mf;

	BundleEntry mfEntry = getBundleFile().getEntry(org.eclipse.osgi.framework.internal.core.Constants.OSGI_BUNDLE_MANIFEST);
	if (mfEntry != null)
	try {
	InputStream manIn = mfEntry.getInputStream();
	mf = new Manifest(manIn);
	manIn.close();
	} catch (IOException e) {
	// do nothing
	}
	initMF = true;
	return mf;
	}
	}
	}