bundles/org.eclipse.e4.languages.javascript/src/org/eclipse/e4/internal/languages/javascript/JSFrameworkImpl.java - e4/org.eclipse.e4.languages - Git at Google

 /*******************************************************************************
  * Copyright (c) 2009 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.e4.internal.languages.javascript;

 import java.io.BufferedInputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.Reader;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;

 import org.eclipse.e4.languages.javascript.JSBundle;
 import org.eclipse.e4.languages.javascript.JSBundleException;
 import org.eclipse.e4.languages.javascript.JSFramework;
 import org.eclipse.e4.languages.javascript.JSONUtil;
 import org.mozilla.javascript.Context;
 import org.mozilla.javascript.ContextAction;
 import org.mozilla.javascript.ContextFactory;
 import org.mozilla.javascript.LazilyLoadedCtor;
 import org.mozilla.javascript.Scriptable;
 import org.mozilla.javascript.ScriptableObject;
 import org.osgi.framework.Bundle;

 public class JSFrameworkImpl implements JSFramework {

 	private static final Comparator exportsComparator = new Comparator() {
 		// sorts in descending version order, then ascending bundle id
 		public int compare(Object arg0, Object arg1) {
 			JSExportPackage export0 = (JSExportPackage) arg0;
 			JSExportPackage export1 = (JSExportPackage) arg1;

 			// order switched for descending order
 			int result = export1.getVersion().compareTo(export0.getVersion());
 			if (result == 0)
 				result = export0.getBundleId() - export1.getBundleId();

 			return result;
 		}
 	};

 	private static final Comparator requireBundlesComparator = new Comparator() {
 		// sorts in descending version order, then ascending bundle id
 		public int compare(Object arg0, Object arg1) {
 			JSBundle bundle0 = (JSBundle) arg0;
 			JSBundle bundle1 = (JSBundle) arg1;

 			// order switched for descending order
 			int result = bundle1.getVersion().compareTo(bundle0.getVersion());
 			if (result == 0)
 				result = bundle0.getBundleId() - bundle1.getBundleId();

 			return result;
 		}
 	};

 	private List installOrderBundles = new ArrayList();
 	private List resolveOrderBundles = new ArrayList();
 	private Map exports = new HashMap();
 	private Map requiredBundles = new HashMap();
 	private int currentBundleId = 0;

 	private final Scriptable frameworkScope;

 	private final Map properties = new HashMap();

 	private ContextFactory contextFactory;

 	private static Map loadHeaders(String location) throws JSBundleException {
 		String contents;
 		try {
 			URL url = new URL(location);
 			contents = readContents(url);
 		} catch (IOException e) {
 			throw new JSBundleException("error reading contents from: " + location, e); //$NON-NLS-1$
 		}

 		try {
 			Object headers = JSONUtil.read(contents);
 			if (headers instanceof Map)
 				return (Map) headers;
 			throw new JSBundleException("invalid representation - JSON Object expected from: " + location); //$NON-NLS-1$
 		} catch (RuntimeException e) {
 			throw new JSBundleException("error parsing JSON contents from: " + location, e); //$NON-NLS-1$
 		}
 	}

 	private static String readContents(URL url) throws IOException {
 		Reader reader = new InputStreamReader(new BufferedInputStream(url.openStream()));
 		try {
 			StringBuffer buffer = new StringBuffer();
 			int read = 0;
 			char[] cbuf = new char[1024];
 			while (-1 != (read = reader.read(cbuf))) {
 				buffer.append(cbuf, 0, read);
 			}
 			return buffer.toString();
 		} finally {
 			try {
 				reader.close();
 			} catch (IOException e) {
 				// ignore
 			}
 		}
 	}

 	public JSFrameworkImpl() {
 		this(new ContextFactory());
 	}

 	public JSFrameworkImpl(ContextFactory contextFactory) {
 		this.contextFactory = contextFactory;
 		frameworkScope = (Scriptable) contextFactory.call(new ContextAction() {
 			public Object run(Context cx) {
 				return cx.initStandardObjects();
 			}
 		});
 	}


 	ContextFactory getContextFactory() {
 		return contextFactory;
 	}

 	public JSBundle installBundle(String location) throws JSBundleException {
 		Map headers = loadHeaders(location);
 		return installBundle(location, headers);
 	}

 	public JSBundle installBundle(String location, Map headers) throws JSBundleException {
 		return installBundle(location, headers, new RhinoClassLoader());
 	}

 	public JSBundle installBundle(String location, Bundle bundle) throws JSBundleException {
 		Map headers = loadHeaders(location);
 		return installBundle(location, headers, new RhinoClassLoader(bundle));
 	}

 	public JSBundle installBundle(String location, Map headers, Bundle bundle) throws JSBundleException {
 		if (bundle == null)
 			throw new IllegalArgumentException("Bundle cannot be null"); //$NON-NLS-1$
 		return installBundle(location, headers, new RhinoClassLoader(bundle));
 	}

 	/**
 	 * @throws JSBundleException
 	 */
 	public JSBundle installBundle(String location, Map headers, RhinoClassLoader contextClassLoader) throws JSBundleException {
 		if (location == null)
 			throw new IllegalArgumentException("Location cannot be null"); //$NON-NLS-1$

 		if (contextClassLoader == null)
 			contextClassLoader = new RhinoClassLoader();

 		JSBundleData bundleData = new JSBundleData(currentBundleId, location, headers, contextClassLoader);
 		JSBundle jsBundle = new JSBundleImpl(this, bundleData);
 		int index = installOrderBundles.indexOf(jsBundle);
 		if (index != -1)
 			return (JSBundle) installOrderBundles.get(index);

 		currentBundleId++;
 		installOrderBundles.add(jsBundle);
 		return jsBundle;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.e4.internal.javascript.JSFramework#getBundles()
 	 */
 	public JSBundle[] getBundles() {
 		return (JSBundle[]) installOrderBundles.toArray(new JSBundle[installOrderBundles.size()]);
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.e4.internal.javascript.JSFramework#refresh()
 	 */
 	public void refresh() {
 		boolean uninstalledBundleFound = false;
 		for (Iterator iterator = resolveOrderBundles.iterator(); iterator.hasNext();) {
 			JSBundleImpl bundle = (JSBundleImpl) iterator.next();
 			if (bundle.getState() == JSBundle.UNINSTALLED) {
 				uninstalledBundleFound = true;
 				installOrderBundles.remove(bundle);
 			}

 			if (uninstalledBundleFound) {
 				unresolveBundle(bundle);
 				iterator.remove();
 			}
 		}
 		if (uninstalledBundleFound)
 			resolve();
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.e4.internal.javascript.JSFramework#resolve()
 	 */
 	public void resolve() {
 		final List unresolvedBundles = new ArrayList();
 		for (Iterator iterator = installOrderBundles.iterator(); iterator.hasNext();) {
 			JSBundle bundle = (JSBundle) iterator.next();
 			if (bundle.getState() == JSBundle.INSTALLED)
 				unresolvedBundles.add(bundle);
 		}

 		contextFactory.call(new ContextAction() {
 			public Object run(Context cx) {
 				List resolvedBundles = new ArrayList();
 				while (!unresolvedBundles.isEmpty()) {
 					JSBundleImpl resolvedBundle = stepResolver(unresolvedBundles);
 					if (resolvedBundle != null)
 						resolvedBundles.add(resolvedBundle);
 					else
 						break;
 				}
 				for (Iterator iterator = resolvedBundles.iterator(); iterator.hasNext();) {
 					JSBundleImpl resolvedBundle = (JSBundleImpl) iterator.next();
 					if (resolvedBundle.isMarkedStarted())
 						resolvedBundle.start();
 				}
 				return null;
 			}
 		});
 	}

 	JSBundleImpl stepResolver(List unresolved) {
 		for (Iterator iterator = unresolved.iterator(); iterator.hasNext();) {
 			JSBundleImpl bundle = (JSBundleImpl) iterator.next();
 			if (resolveBundle(bundle)) {
 				resolveOrderBundles.add(bundle);
 				iterator.remove();

 				return bundle;
 			}
 		}
 		return null;
 	}

 	private boolean resolveBundle(JSBundleImpl jsBundle) {
 		if (jsBundle.isSingleton() && requiredBundles.containsKey(jsBundle.getSymbolicName()))
 			return false;

 		if (wire(jsBundle)) {
 			jsBundle.resolve();
 			addExports(jsBundle);
 			addRequiredBunde(jsBundle);
 			return true;
 		}
 		unwire(jsBundle);
 		return false;
 	}

 	private void unresolveBundle(JSBundleImpl jsBundle) {
 		removeExports(jsBundle);
 		removeRequiredBunde(jsBundle);
 		jsBundle.unresolve();
 		unwire(jsBundle);
 	}

 	private boolean wire(JSBundleImpl bundle) {
 		return wireRequires(bundle) && wireImports(bundle);
 	}

 	private boolean wireRequires(JSBundleImpl bundle) {
 		List requires = bundle.getRequires();
 		for (Iterator iterator = requires.iterator(); iterator.hasNext();) {
 			JSRequireBundle jsRequire = (JSRequireBundle) iterator.next();
 			String name = jsRequire.getName();
 			List candidates = (List) requiredBundles.get(name);
 			if (candidates == null)
 				return false;

 			boolean satisfied = false;
 			for (Iterator candidatesIterator = candidates.iterator(); candidatesIterator.hasNext();) {
 				JSBundleImpl candidate = (JSBundleImpl) candidatesIterator.next();
 				satisfied = jsRequire.wire(candidate);
 				if (satisfied)
 					break;
 			}
 			if (!satisfied && !jsRequire.isOptional())
 				return false;
 		}
 		return true;
 	}

 	private boolean wireImports(JSBundleImpl bundle) {
 		Collection imports = bundle.getImports();
 		for (Iterator iterator = imports.iterator(); iterator.hasNext();) {
 			JSImportPackage jsImport = (JSImportPackage) iterator.next();
 			String name = jsImport.getName();
 			List candidates = (List) exports.get(name);
 			if (candidates == null)
 				return false;

 			boolean satisfied = false;
 			for (Iterator candidatesIterator = candidates.iterator(); candidatesIterator.hasNext();) {
 				JSExportPackage candidate = (JSExportPackage) candidatesIterator.next();
 				satisfied = jsImport.wire(candidate);
 				if (satisfied)
 					break;
 			}
 			if (!satisfied && !jsImport.isOptional())
 				return false;
 		}
 		return true;
 	}

 	private void addExports(JSBundleImpl bundle) {
 		for (Iterator it = bundle.getExports().iterator(); it.hasNext();) {
 			JSExportPackage jsExport = (JSExportPackage) it.next();
 			String name = jsExport.getName();
 			List namedExports = (List) exports.get(name);
 			if (namedExports == null) {
 				namedExports = new ArrayList();
 				exports.put(name, namedExports);
 			}
 			namedExports.add(jsExport);
 			Collections.sort(namedExports, exportsComparator);
 		}
 	}

 	private void addRequiredBunde(JSBundle bundle) {
 		String name = bundle.getSymbolicName();
 		List namedBundles = (List) requiredBundles.get(name);
 		if (namedBundles == null) {
 			namedBundles = new ArrayList();
 			requiredBundles.put(name, namedBundles);
 		}
 		namedBundles.add(bundle);
 		Collections.sort(namedBundles, requireBundlesComparator);
 	}

 	private void unwire(JSBundleImpl jsBundle) {
 		unwireImports(jsBundle);
 		unwireRequires(jsBundle);
 	}

 	private void unwireImports(JSBundleImpl bundle) {
 		Collection imports = bundle.getImports();
 		for (Iterator iterator = imports.iterator(); iterator.hasNext();) {
 			JSImportPackage jsImport = (JSImportPackage) iterator.next();
 			jsImport.unwire();
 		}
 	}

 	private void unwireRequires(JSBundleImpl bundle) {
 		List requires = bundle.getRequires();
 		for (Iterator iterator = requires.iterator(); iterator.hasNext();) {
 			JSRequireBundle jsRequire = (JSRequireBundle) iterator.next();
 			jsRequire.unwire();
 		}
 	}

 	private void removeRequiredBunde(JSBundle bundle) {
 		String name = bundle.getSymbolicName();
 		List namedBundles = (List) requiredBundles.get(name);
 		if (namedBundles == null)
 			return;
 		namedBundles.remove(bundle);
 		if (namedBundles.isEmpty())
 			requiredBundles.remove(name);
 	}

 	private void removeExports(JSBundleImpl bundle) {
 		for (Iterator it = bundle.getExports().iterator(); it.hasNext();) {
 			JSExportPackage jsExport = (JSExportPackage) it.next();
 			String name = jsExport.getName();
 			List namedExports = (List) exports.get(name);
 			if (namedExports == null)
 				continue;
 			namedExports.remove(jsExport);
 			if (namedExports.isEmpty())
 				exports.remove(name);
 		}
 	}

 	protected Scriptable createScope(ClassLoader classLoader) {
 		Context cx = Context.getCurrentContext();
 		ClassLoader current = cx.getApplicationClassLoader();
 		cx.setApplicationClassLoader(classLoader);
 		try {
 			ScriptableObject scope = (ScriptableObject) cx.newObject(frameworkScope);
 			//scope.setPrototype(frameworkScope);
 			scope.setParentScope(frameworkScope);
 			// We want the Packages and other NativeJavaTopPackage(s) to be per class loader.
 			new LazilyLoadedCtor(scope, "Packages", "org.mozilla.javascript.NativeJavaTopPackage", false); //$NON-NLS-1$//$NON-NLS-2$
 			// this is done to prime the NativeJavaTopPackage (named Packages) with the correct class loader
 			scope.get("Packages", scope); //$NON-NLS-1$
 			return scope;
 		} finally {
 			cx.setApplicationClassLoader(current);
 		}
 	}

 	public JSBundleContext getBundleContext(JSBundle jsBundle) {
 		return new JSBundleContext(jsBundle, this);
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.e4.internal.javascript.JSFramework#getProperty(java.lang.String)
 	 */
 	public String getProperty(String name) {
 		return (String) properties.get(name);
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.e4.internal.javascript.JSFramework#setProperty(java.lang.String, java.lang.String)
 	 */
 	public void setProperty(String name, String value) {
 		properties.put(name, value);
 	}

 	public void shutdown() {
 		List reversed = new ArrayList(installOrderBundles);
 		Collections.reverse(reversed);
 		for (Iterator iterator = reversed.iterator(); iterator.hasNext();) {
 			JSBundle jsBundle = (JSBundle) iterator.next();
 			jsBundle.stop();
 			jsBundle.uninstall();
 		}
 		refresh();
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2009 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.e4.internal.languages.javascript;

	import java.io.BufferedInputStream;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.io.Reader;
	import java.net.URL;
	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.Comparator;
	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Map;

	import org.eclipse.e4.languages.javascript.JSBundle;
	import org.eclipse.e4.languages.javascript.JSBundleException;
	import org.eclipse.e4.languages.javascript.JSFramework;
	import org.eclipse.e4.languages.javascript.JSONUtil;
	import org.mozilla.javascript.Context;
	import org.mozilla.javascript.ContextAction;
	import org.mozilla.javascript.ContextFactory;
	import org.mozilla.javascript.LazilyLoadedCtor;
	import org.mozilla.javascript.Scriptable;
	import org.mozilla.javascript.ScriptableObject;
	import org.osgi.framework.Bundle;

	public class JSFrameworkImpl implements JSFramework {

	private static final Comparator exportsComparator = new Comparator() {
	// sorts in descending version order, then ascending bundle id
	public int compare(Object arg0, Object arg1) {
	JSExportPackage export0 = (JSExportPackage) arg0;
	JSExportPackage export1 = (JSExportPackage) arg1;

	// order switched for descending order
	int result = export1.getVersion().compareTo(export0.getVersion());
	if (result == 0)
	result = export0.getBundleId() - export1.getBundleId();

	return result;
	}
	};

	private static final Comparator requireBundlesComparator = new Comparator() {
	// sorts in descending version order, then ascending bundle id
	public int compare(Object arg0, Object arg1) {
	JSBundle bundle0 = (JSBundle) arg0;
	JSBundle bundle1 = (JSBundle) arg1;

	// order switched for descending order
	int result = bundle1.getVersion().compareTo(bundle0.getVersion());
	if (result == 0)
	result = bundle0.getBundleId() - bundle1.getBundleId();

	return result;
	}
	};

	private List installOrderBundles = new ArrayList();
	private List resolveOrderBundles = new ArrayList();
	private Map exports = new HashMap();
	private Map requiredBundles = new HashMap();
	private int currentBundleId = 0;

	private final Scriptable frameworkScope;

	private final Map properties = new HashMap();

	private ContextFactory contextFactory;

	private static Map loadHeaders(String location) throws JSBundleException {
	String contents;
	try {
	URL url = new URL(location);
	contents = readContents(url);
	} catch (IOException e) {
	throw new JSBundleException("error reading contents from: " + location, e); //$NON-NLS-1$
	}

	try {
	Object headers = JSONUtil.read(contents);
	if (headers instanceof Map)
	return (Map) headers;
	throw new JSBundleException("invalid representation - JSON Object expected from: " + location); //$NON-NLS-1$
	} catch (RuntimeException e) {
	throw new JSBundleException("error parsing JSON contents from: " + location, e); //$NON-NLS-1$
	}
	}

	private static String readContents(URL url) throws IOException {
	Reader reader = new InputStreamReader(new BufferedInputStream(url.openStream()));
	try {
	StringBuffer buffer = new StringBuffer();
	int read = 0;
	char[] cbuf = new char[1024];
	while (-1 != (read = reader.read(cbuf))) {
	buffer.append(cbuf, 0, read);
	}
	return buffer.toString();
	} finally {
	try {
	reader.close();
	} catch (IOException e) {
	// ignore
	}
	}
	}

	public JSFrameworkImpl() {
	this(new ContextFactory());
	}

	public JSFrameworkImpl(ContextFactory contextFactory) {
	this.contextFactory = contextFactory;
	frameworkScope = (Scriptable) contextFactory.call(new ContextAction() {
	public Object run(Context cx) {
	return cx.initStandardObjects();
	}
	});
	}


	ContextFactory getContextFactory() {
	return contextFactory;
	}

	public JSBundle installBundle(String location) throws JSBundleException {
	Map headers = loadHeaders(location);
	return installBundle(location, headers);
	}

	public JSBundle installBundle(String location, Map headers) throws JSBundleException {
	return installBundle(location, headers, new RhinoClassLoader());
	}

	public JSBundle installBundle(String location, Bundle bundle) throws JSBundleException {
	Map headers = loadHeaders(location);
	return installBundle(location, headers, new RhinoClassLoader(bundle));
	}

	public JSBundle installBundle(String location, Map headers, Bundle bundle) throws JSBundleException {
	if (bundle == null)
	throw new IllegalArgumentException("Bundle cannot be null"); //$NON-NLS-1$
	return installBundle(location, headers, new RhinoClassLoader(bundle));
	}

	/**
	* @throws JSBundleException
	*/
	public JSBundle installBundle(String location, Map headers, RhinoClassLoader contextClassLoader) throws JSBundleException {
	if (location == null)
	throw new IllegalArgumentException("Location cannot be null"); //$NON-NLS-1$

	if (contextClassLoader == null)
	contextClassLoader = new RhinoClassLoader();

	JSBundleData bundleData = new JSBundleData(currentBundleId, location, headers, contextClassLoader);
	JSBundle jsBundle = new JSBundleImpl(this, bundleData);
	int index = installOrderBundles.indexOf(jsBundle);
	if (index != -1)
	return (JSBundle) installOrderBundles.get(index);

	currentBundleId++;
	installOrderBundles.add(jsBundle);
	return jsBundle;
	}

	/* (non-Javadoc)
	* @see org.eclipse.e4.internal.javascript.JSFramework#getBundles()
	*/
	public JSBundle[] getBundles() {
	return (JSBundle[]) installOrderBundles.toArray(new JSBundle[installOrderBundles.size()]);
	}

	/* (non-Javadoc)
	* @see org.eclipse.e4.internal.javascript.JSFramework#refresh()
	*/
	public void refresh() {
	boolean uninstalledBundleFound = false;
	for (Iterator iterator = resolveOrderBundles.iterator(); iterator.hasNext();) {
	JSBundleImpl bundle = (JSBundleImpl) iterator.next();
	if (bundle.getState() == JSBundle.UNINSTALLED) {
	uninstalledBundleFound = true;
	installOrderBundles.remove(bundle);
	}

	if (uninstalledBundleFound) {
	unresolveBundle(bundle);
	iterator.remove();
	}
	}
	if (uninstalledBundleFound)
	resolve();
	}

	/* (non-Javadoc)
	* @see org.eclipse.e4.internal.javascript.JSFramework#resolve()
	*/
	public void resolve() {
	final List unresolvedBundles = new ArrayList();
	for (Iterator iterator = installOrderBundles.iterator(); iterator.hasNext();) {
	JSBundle bundle = (JSBundle) iterator.next();
	if (bundle.getState() == JSBundle.INSTALLED)
	unresolvedBundles.add(bundle);
	}

	contextFactory.call(new ContextAction() {
	public Object run(Context cx) {
	List resolvedBundles = new ArrayList();
	while (!unresolvedBundles.isEmpty()) {
	JSBundleImpl resolvedBundle = stepResolver(unresolvedBundles);
	if (resolvedBundle != null)
	resolvedBundles.add(resolvedBundle);
	else
	break;
	}
	for (Iterator iterator = resolvedBundles.iterator(); iterator.hasNext();) {
	JSBundleImpl resolvedBundle = (JSBundleImpl) iterator.next();
	if (resolvedBundle.isMarkedStarted())
	resolvedBundle.start();
	}
	return null;
	}
	});
	}

	JSBundleImpl stepResolver(List unresolved) {
	for (Iterator iterator = unresolved.iterator(); iterator.hasNext();) {
	JSBundleImpl bundle = (JSBundleImpl) iterator.next();
	if (resolveBundle(bundle)) {
	resolveOrderBundles.add(bundle);
	iterator.remove();

	return bundle;
	}
	}
	return null;
	}

	private boolean resolveBundle(JSBundleImpl jsBundle) {
	if (jsBundle.isSingleton() && requiredBundles.containsKey(jsBundle.getSymbolicName()))
	return false;

	if (wire(jsBundle)) {
	jsBundle.resolve();
	addExports(jsBundle);
	addRequiredBunde(jsBundle);
	return true;
	}
	unwire(jsBundle);
	return false;
	}

	private void unresolveBundle(JSBundleImpl jsBundle) {
	removeExports(jsBundle);
	removeRequiredBunde(jsBundle);
	jsBundle.unresolve();
	unwire(jsBundle);
	}

	private boolean wire(JSBundleImpl bundle) {
	return wireRequires(bundle) && wireImports(bundle);
	}

	private boolean wireRequires(JSBundleImpl bundle) {
	List requires = bundle.getRequires();
	for (Iterator iterator = requires.iterator(); iterator.hasNext();) {
	JSRequireBundle jsRequire = (JSRequireBundle) iterator.next();
	String name = jsRequire.getName();
	List candidates = (List) requiredBundles.get(name);
	if (candidates == null)
	return false;

	boolean satisfied = false;
	for (Iterator candidatesIterator = candidates.iterator(); candidatesIterator.hasNext();) {
	JSBundleImpl candidate = (JSBundleImpl) candidatesIterator.next();
	satisfied = jsRequire.wire(candidate);
	if (satisfied)
	break;
	}
	if (!satisfied && !jsRequire.isOptional())
	return false;
	}
	return true;
	}

	private boolean wireImports(JSBundleImpl bundle) {
	Collection imports = bundle.getImports();
	for (Iterator iterator = imports.iterator(); iterator.hasNext();) {
	JSImportPackage jsImport = (JSImportPackage) iterator.next();
	String name = jsImport.getName();
	List candidates = (List) exports.get(name);
	if (candidates == null)
	return false;

	boolean satisfied = false;
	for (Iterator candidatesIterator = candidates.iterator(); candidatesIterator.hasNext();) {
	JSExportPackage candidate = (JSExportPackage) candidatesIterator.next();
	satisfied = jsImport.wire(candidate);
	if (satisfied)
	break;
	}
	if (!satisfied && !jsImport.isOptional())
	return false;
	}
	return true;
	}

	private void addExports(JSBundleImpl bundle) {
	for (Iterator it = bundle.getExports().iterator(); it.hasNext();) {
	JSExportPackage jsExport = (JSExportPackage) it.next();
	String name = jsExport.getName();
	List namedExports = (List) exports.get(name);
	if (namedExports == null) {
	namedExports = new ArrayList();
	exports.put(name, namedExports);
	}
	namedExports.add(jsExport);
	Collections.sort(namedExports, exportsComparator);
	}
	}

	private void addRequiredBunde(JSBundle bundle) {
	String name = bundle.getSymbolicName();
	List namedBundles = (List) requiredBundles.get(name);
	if (namedBundles == null) {
	namedBundles = new ArrayList();
	requiredBundles.put(name, namedBundles);
	}
	namedBundles.add(bundle);
	Collections.sort(namedBundles, requireBundlesComparator);
	}

	private void unwire(JSBundleImpl jsBundle) {
	unwireImports(jsBundle);
	unwireRequires(jsBundle);
	}

	private void unwireImports(JSBundleImpl bundle) {
	Collection imports = bundle.getImports();
	for (Iterator iterator = imports.iterator(); iterator.hasNext();) {
	JSImportPackage jsImport = (JSImportPackage) iterator.next();
	jsImport.unwire();
	}
	}

	private void unwireRequires(JSBundleImpl bundle) {
	List requires = bundle.getRequires();
	for (Iterator iterator = requires.iterator(); iterator.hasNext();) {
	JSRequireBundle jsRequire = (JSRequireBundle) iterator.next();
	jsRequire.unwire();
	}
	}

	private void removeRequiredBunde(JSBundle bundle) {
	String name = bundle.getSymbolicName();
	List namedBundles = (List) requiredBundles.get(name);
	if (namedBundles == null)
	return;
	namedBundles.remove(bundle);
	if (namedBundles.isEmpty())
	requiredBundles.remove(name);
	}

	private void removeExports(JSBundleImpl bundle) {
	for (Iterator it = bundle.getExports().iterator(); it.hasNext();) {
	JSExportPackage jsExport = (JSExportPackage) it.next();
	String name = jsExport.getName();
	List namedExports = (List) exports.get(name);
	if (namedExports == null)
	continue;
	namedExports.remove(jsExport);
	if (namedExports.isEmpty())
	exports.remove(name);
	}
	}

	protected Scriptable createScope(ClassLoader classLoader) {
	Context cx = Context.getCurrentContext();
	ClassLoader current = cx.getApplicationClassLoader();
	cx.setApplicationClassLoader(classLoader);
	try {
	ScriptableObject scope = (ScriptableObject) cx.newObject(frameworkScope);
	//scope.setPrototype(frameworkScope);
	scope.setParentScope(frameworkScope);
	// We want the Packages and other NativeJavaTopPackage(s) to be per class loader.
	new LazilyLoadedCtor(scope, "Packages", "org.mozilla.javascript.NativeJavaTopPackage", false); //$NON-NLS-1$//$NON-NLS-2$
	// this is done to prime the NativeJavaTopPackage (named Packages) with the correct class loader
	scope.get("Packages", scope); //$NON-NLS-1$
	return scope;
	} finally {
	cx.setApplicationClassLoader(current);
	}
	}

	public JSBundleContext getBundleContext(JSBundle jsBundle) {
	return new JSBundleContext(jsBundle, this);
	}

	/* (non-Javadoc)
	* @see org.eclipse.e4.internal.javascript.JSFramework#getProperty(java.lang.String)
	*/
	public String getProperty(String name) {
	return (String) properties.get(name);
	}

	/* (non-Javadoc)
	* @see org.eclipse.e4.internal.javascript.JSFramework#setProperty(java.lang.String, java.lang.String)
	*/
	public void setProperty(String name, String value) {
	properties.put(name, value);
	}

	public void shutdown() {
	List reversed = new ArrayList(installOrderBundles);
	Collections.reverse(reversed);
	for (Iterator iterator = reversed.iterator(); iterator.hasNext();) {
	JSBundle jsBundle = (JSBundle) iterator.next();
	jsBundle.stop();
	jsBundle.uninstall();
	}
	refresh();
	}
	}