org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/contexts/DebugWindowContextService.java - gerrit/platform/eclipse.platform.debug - Git at Google

 /*******************************************************************************
  *  Copyright (c) 2005, 2010 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
  *     Wind River - Pawel Piech - added an evaluation context source provider (bug 229219)
  *     Patrick Chuong (Texas Instruments) and Pawel Piech (Wind River) -
  *     		Allow multiple debug views and multiple debug context providers (Bug 327263)
  *******************************************************************************/
 package org.eclipse.debug.internal.ui.contexts;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;

 import org.eclipse.core.runtime.ISafeRunnable;
 import org.eclipse.core.runtime.ListenerList;
 import org.eclipse.core.runtime.SafeRunner;
 import org.eclipse.debug.internal.ui.DebugUIPlugin;
 import org.eclipse.debug.ui.contexts.DebugContextEvent;
 import org.eclipse.debug.ui.contexts.IDebugContextListener;
 import org.eclipse.debug.ui.contexts.IDebugContextProvider;
 import org.eclipse.debug.ui.contexts.IDebugContextProvider2;
 import org.eclipse.debug.ui.contexts.IDebugContextService;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.StructuredSelection;
 import org.eclipse.ui.IPartListener2;
 import org.eclipse.ui.IViewSite;
 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.IWorkbenchPart;
 import org.eclipse.ui.IWorkbenchPartReference;
 import org.eclipse.ui.IWorkbenchWindow;
 import org.eclipse.ui.services.IEvaluationService;

 /**
  * Context service for a specific window.
  *
  * @since 3.2
  */
 public class DebugWindowContextService implements IDebugContextService, IPartListener2, IDebugContextListener {

 	private Map fListenersByPartId = new HashMap();
 	private Map fProvidersByPartId = new HashMap();
 	private Map fPostListenersByPartId = new HashMap();

 	private IWorkbenchWindow fWindow;
 	private List fProviders = new ArrayList();

 	private DebugContextSourceProvider fSourceProvider;

 	public DebugWindowContextService(IWorkbenchWindow window) {
 		fWindow = window;
 		fWindow.getPartService().addPartListener(this);

 		IEvaluationService evaluationService = (IEvaluationService)window.getService(IEvaluationService.class);
 		fSourceProvider = new DebugContextSourceProvider(this, evaluationService);
 	}

 	public void dispose() {
 		fSourceProvider.dispose();
 		fWindow.getPartService().removePartListener(this);
 		fWindow = null;
 	}

 	public synchronized void addDebugContextProvider(IDebugContextProvider provider) {
 	    if (fWindow == null) return; // disposed

 		IWorkbenchPart part = provider.getPart();
 		fProvidersByPartId.put( getCombinedPartId(part), provider );

 		// Check if provider is a window context provider
 		boolean canSetActive = true;
         if (provider instanceof IDebugContextProvider2) {
             canSetActive = ((IDebugContextProvider2) provider).isWindowContextProvider();
         }
         // Make the provider active if matches the active part. Otherwise, it
         // may still become the active provider if fProviders.isEmpty().
 		if (canSetActive) {
 	        IWorkbenchPart activePart = null;
 	        IWorkbenchPage activePage = fWindow.getActivePage();
 	        if (activePage != null) {
 	            activePart = activePage.getActivePart();
 	        }
 	        canSetActive = (activePart == null && part == null) || (activePart != null && activePart.equals(part));
 		}

 		if (canSetActive) {
 		    fProviders.add(0, provider);
 		} else {
 		    fProviders.add(provider);
 		}
         notify(provider);
 		provider.addDebugContextListener(this);
 	}

 	public synchronized void removeDebugContextProvider(IDebugContextProvider provider) {
 		int index = fProviders.indexOf(provider);
 		if (index >= 0) {
 			fProvidersByPartId.remove( getCombinedPartId(provider.getPart()) );
 			fProviders.remove(index);
 			IDebugContextProvider activeProvider = getActiveProvider();
 			if (index == 0) {
     			if (activeProvider != null) {
     				notify(activeProvider);
     			} else {
     			    // Removed last provider.  Send empty selection to all listeners.
     				notify(new DebugContextEvent(provider, StructuredSelection.EMPTY, DebugContextEvent.ACTIVATED));
     			}
 			} else {
 			    // Notify listeners of the removed provider with the active window context.
 			    notifyPart(provider.getPart(),
 			        new DebugContextEvent(activeProvider, getActiveContext(), DebugContextEvent.ACTIVATED));
 			}
 		}
 		provider.removeDebugContextListener(this);
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService#addDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener)
 	 */
 	public void addDebugContextListener(IDebugContextListener listener) {
 		addDebugContextListener(listener, null);
 	}

 	public void addPostDebugContextListener(IDebugContextListener listener, String partId) {
 		ListenerList list = (ListenerList) fPostListenersByPartId.get(partId);
 		if (list == null) {
 			list = new ListenerList();
 			fPostListenersByPartId.put(partId, list);
 		}
 		list.add(listener);
 	}

 	public void addPostDebugContextListener(IDebugContextListener listener) {
 		addPostDebugContextListener(listener, null);
 	}

 	public void removePostDebugContextListener(IDebugContextListener listener, String partId) {
 		ListenerList list = (ListenerList) fPostListenersByPartId.get(partId);
 		if (list != null) {
 			list.remove(listener);
 		}
 	}

 	public void removePostDebugContextListener(IDebugContextListener listener) {
 		removePostDebugContextListener(listener, null);
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService#removeDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener)
 	 */
 	public void removeDebugContextListener(IDebugContextListener listener) {
 		removeDebugContextListener(listener, null);
 	}

 	/**
 	 * Notifies listeners of the context in the specified provider.
 	 *
 	 * @param provdier context provider
 	 */
 	protected void notify(IDebugContextProvider provdier) {
 		ISelection activeContext = provdier.getActiveContext();
 		if (activeContext == null) {
 			activeContext = new StructuredSelection();
 		}
 		notify(new DebugContextEvent(provdier, activeContext, DebugContextEvent.ACTIVATED));
 	}

 	protected void notify(DebugContextEvent event) {
 	    // Allow handling for case where getActiveProvider() == null.
 	    // This can happen upon removeContextProvider() called on last available
 	    // provider (bug 360637).
 		IDebugContextProvider provider = getActiveProvider();
 		IWorkbenchPart part = event.getDebugContextProvider().getPart();

 		// Once for listeners
 		if (provider == null || provider == event.getDebugContextProvider()) {
 			notify(event, getListeners(null));
 		}
 		if (part != null) {
 			notify(event, getListeners(part));
 		}

 		// Again for post-listeners
 		if (provider == null || provider == event.getDebugContextProvider()) {
 			notify(event, getPostListeners(null));
 		}
 		if (part != null) {
 			notify(event, getPostListeners(part));
 		}
 	}

 	protected void notifyPart(IWorkbenchPart part, DebugContextEvent event) {
         if (part != null) {
             notify(event, getListeners(part));
             notify(event, getPostListeners(part));
         }
     }

 	protected void notify(final DebugContextEvent event, Object[] listeners) {
 		for (int i = 0; i < listeners.length; i++) {
 			final IDebugContextListener listener = (IDebugContextListener) listeners[i];
 			SafeRunner.run(new ISafeRunnable() {
 				public void run() throws Exception {
 					listener.debugContextChanged(event);
 				}
 				public void handleException(Throwable exception) {
 					DebugUIPlugin.log(exception);
 				}
 			});
 		}
 	}

 	protected Object[] getListeners(IWorkbenchPart part) {
         String id = null;
         if (part != null) {
             id = getCombinedPartId(part);
             ListenerList listenerList = (ListenerList)fListenersByPartId.get(id);
             return listenerList != null ? listenerList.getListeners() : new Object[0];
         } else {
             List retVal = new ArrayList();
             retVal.addAll(Arrays.asList(((ListenerList)fListenersByPartId.get(null)).getListeners()) );
             outer: for (Iterator itr = fListenersByPartId.keySet().iterator(); itr.hasNext();) {
                 String listenerPartId = (String)itr.next();
                 for (int i = 0; i < fProviders.size(); i++) {
                     String providerPartId = getCombinedPartId(((IDebugContextProvider)fProviders.get(i)).getPart());
                     if ((listenerPartId == null && providerPartId == null) ||
                         (listenerPartId != null && listenerPartId.equals(providerPartId)))
                     {
                         continue outer;
                     }
                 }

                 List toAdd = Arrays.asList(((ListenerList)fListenersByPartId.get(listenerPartId)).getListeners());
                 for (Iterator addItr = toAdd.iterator(); addItr.hasNext();) {
                 	Object element = addItr.next();
                 	if (!retVal.contains(element)) retVal.add(element);

                 }
             }
             return retVal.toArray();
         }
 	}

 	protected Object[] getPostListeners(IWorkbenchPart part) {
 		String id = null;
         if (part != null) {
             id = getCombinedPartId(part);
             ListenerList listenerList = (ListenerList)fPostListenersByPartId.get(id);
             return listenerList != null ? listenerList.getListeners() : new Object[0];
         } else {
             List retVal = new ArrayList();
             ListenerList postListenersList = (ListenerList)fPostListenersByPartId.get(null);
             if (postListenersList != null) {
                 retVal.addAll( Arrays.asList(postListenersList.getListeners()) );
             }

             outer: for (Iterator itr = fPostListenersByPartId.keySet().iterator(); itr.hasNext();) {
                 String listenerPartId = (String)itr.next();
                 for (int i = 0; i < fProviders.size(); i++) {
                     String providerPartId = getCombinedPartId(((IDebugContextProvider)fProviders.get(i)).getPart());
                     if ((listenerPartId == null && providerPartId == null) ||
                         (listenerPartId != null && listenerPartId.equals(providerPartId)))
                     {
                         continue outer;
                     }
                 }
                 retVal.addAll( Arrays.asList(((ListenerList)fPostListenersByPartId.get(listenerPartId)).getListeners()) );
             }
             return retVal.toArray();
         }
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService#addDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String)
 	 */
 	public synchronized void addDebugContextListener(IDebugContextListener listener, String partId) {
 		ListenerList list = (ListenerList) fListenersByPartId.get(partId);
 		if (list == null) {
 			list = new ListenerList();
 			fListenersByPartId.put(partId, list);
 		}
 		list.add(listener);
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService#removeDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String)
 	 */
 	public void removeDebugContextListener(IDebugContextListener listener, String partId) {
 		ListenerList list = (ListenerList) fListenersByPartId.get(partId);
 		if (list != null) {
 			list.remove(listener);
 			if (list.size() == 0)
 				fListenersByPartId.remove(partId);
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService#getActiveContext(java.lang.String)
 	 */
 	public ISelection getActiveContext(String partId) {
 		IDebugContextProvider provider = (IDebugContextProvider) fProvidersByPartId.get(partId);
 		if (provider != null) {
 			return provider.getActiveContext();
 		}
 		return getActiveContext();
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService#getActiveContext()
 	 */
 	public ISelection getActiveContext() {
 		IDebugContextProvider activeProvider = getActiveProvider();
 		if (activeProvider != null) {
 			return activeProvider.getActiveContext();
 		}
 		return null;
 	}

 	/**
 	 * Returns the active provider or <code>null</code>
 	 *
 	 * @return active provider or <code>null</code>
 	 */
 	private IDebugContextProvider getActiveProvider() {
 		if (!fProviders.isEmpty()) {
 			return (IDebugContextProvider)fProviders.get(0);
 		}
 		return null;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.ui.IPartListener2#partActivated(org.eclipse.ui.IWorkbenchPartReference)
 	 */
 	public void partActivated(IWorkbenchPartReference partRef) {
 		IDebugContextProvider provider = (IDebugContextProvider) fProvidersByPartId.get(partRef.getId());
 		if (provider != null) {
 			boolean canSetActive = true;
 			if (provider instanceof IDebugContextProvider2) {
 				canSetActive = ((IDebugContextProvider2) provider).isWindowContextProvider();
 			}

 			if (canSetActive) {
 				int index = fProviders.indexOf(provider);
 				if (index > 0) {
 					fProviders.remove(index);
 					fProviders.add(0, provider);
 					notify(provider);
 				}
 			}
 		}

 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.ui.IPartListener2#partBroughtToTop(org.eclipse.ui.IWorkbenchPartReference)
 	 */
 	public void partBroughtToTop(IWorkbenchPartReference partRef) {
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.ui.IPartListener2#partClosed(org.eclipse.ui.IWorkbenchPartReference)
 	 */
 	public synchronized void partClosed(IWorkbenchPartReference partRef) {
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.ui.IPartListener2#partDeactivated(org.eclipse.ui.IWorkbenchPartReference)
 	 */
 	public void partDeactivated(IWorkbenchPartReference partRef) {
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.ui.IPartListener2#partOpened(org.eclipse.ui.IWorkbenchPartReference)
 	 */
 	public void partOpened(IWorkbenchPartReference partRef) {
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.ui.IPartListener2#partHidden(org.eclipse.ui.IWorkbenchPartReference)
 	 */
 	public void partHidden(IWorkbenchPartReference partRef) {
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.ui.IPartListener2#partVisible(org.eclipse.ui.IWorkbenchPartReference)
 	 */
 	public void partVisible(IWorkbenchPartReference partRef) {
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.ui.IPartListener2#partInputChanged(org.eclipse.ui.IWorkbenchPartReference)
 	 */
 	public void partInputChanged(IWorkbenchPartReference partRef) {
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.internal.ui.contexts.provisional.IDebugContextEventListener#contextEvent(org.eclipse.debug.internal.ui.contexts.provisional.DebugContextEvent)
 	 */
 	public void debugContextChanged(DebugContextEvent event) {
 		notify(event);
 	}

 	private String getCombinedPartId(IWorkbenchPart part) {
 	    if (part == null) {
 	        return null;
 	    } else if (part.getSite() instanceof IViewSite) {
             IViewSite site = (IViewSite)part.getSite();
             return getCombinedPartId(site.getId(), site.getSecondaryId());

         } else {
             return part.getSite().getId();
         }
     }

 	private String getCombinedPartId(String id, String secondaryId) {
 		return id + (secondaryId != null ? ":" + secondaryId : "");   //$NON-NLS-1$//$NON-NLS-2$
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService2#addDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String, java.lang.String)
 	 */
 	public void addDebugContextListener(IDebugContextListener listener, String partId, String partSecondaryId) {
 		addDebugContextListener(listener, getCombinedPartId(partId, partSecondaryId));
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService2#removeDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String, java.lang.String)
 	 */
 	public void removeDebugContextListener(IDebugContextListener listener, String partId, String partSecondaryId) {
 		removeDebugContextListener(listener, getCombinedPartId(partId, partSecondaryId));
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService2#addPostDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String, java.lang.String)
 	 */
 	public void addPostDebugContextListener(IDebugContextListener listener, String partId, String partSecondaryId) {
 		addPostDebugContextListener(listener, getCombinedPartId(partId, partSecondaryId));
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService2#removePostDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String, java.lang.String)
 	 */
 	public void removePostDebugContextListener(IDebugContextListener listener, String partId, String partSecondaryId) {
 		removePostDebugContextListener(listener, getCombinedPartId(partId, partSecondaryId));
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.ui.contexts.IDebugContextService2#getActiveContext(java.lang.String, java.lang.String)
 	 */
 	public ISelection getActiveContext(String partId, String partSecondaryId) {
 		return getActiveContext(getCombinedPartId(partId, partSecondaryId));
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2005, 2010 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
	* Wind River - Pawel Piech - added an evaluation context source provider (bug 229219)
	* Patrick Chuong (Texas Instruments) and Pawel Piech (Wind River) -
	* Allow multiple debug views and multiple debug context providers (Bug 327263)
	*******************************************************************************/
	package org.eclipse.debug.internal.ui.contexts;

	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Map;

	import org.eclipse.core.runtime.ISafeRunnable;
	import org.eclipse.core.runtime.ListenerList;
	import org.eclipse.core.runtime.SafeRunner;
	import org.eclipse.debug.internal.ui.DebugUIPlugin;
	import org.eclipse.debug.ui.contexts.DebugContextEvent;
	import org.eclipse.debug.ui.contexts.IDebugContextListener;
	import org.eclipse.debug.ui.contexts.IDebugContextProvider;
	import org.eclipse.debug.ui.contexts.IDebugContextProvider2;
	import org.eclipse.debug.ui.contexts.IDebugContextService;
	import org.eclipse.jface.viewers.ISelection;
	import org.eclipse.jface.viewers.StructuredSelection;
	import org.eclipse.ui.IPartListener2;
	import org.eclipse.ui.IViewSite;
	import org.eclipse.ui.IWorkbenchPage;
	import org.eclipse.ui.IWorkbenchPart;
	import org.eclipse.ui.IWorkbenchPartReference;
	import org.eclipse.ui.IWorkbenchWindow;
	import org.eclipse.ui.services.IEvaluationService;

	/**
	* Context service for a specific window.
	*
	* @since 3.2
	*/
	public class DebugWindowContextService implements IDebugContextService, IPartListener2, IDebugContextListener {

	private Map fListenersByPartId = new HashMap();
	private Map fProvidersByPartId = new HashMap();
	private Map fPostListenersByPartId = new HashMap();

	private IWorkbenchWindow fWindow;
	private List fProviders = new ArrayList();

	private DebugContextSourceProvider fSourceProvider;

	public DebugWindowContextService(IWorkbenchWindow window) {
	fWindow = window;
	fWindow.getPartService().addPartListener(this);

	IEvaluationService evaluationService = (IEvaluationService)window.getService(IEvaluationService.class);
	fSourceProvider = new DebugContextSourceProvider(this, evaluationService);
	}

	public void dispose() {
	fSourceProvider.dispose();
	fWindow.getPartService().removePartListener(this);
	fWindow = null;
	}

	public synchronized void addDebugContextProvider(IDebugContextProvider provider) {
	if (fWindow == null) return; // disposed

	IWorkbenchPart part = provider.getPart();
	fProvidersByPartId.put( getCombinedPartId(part), provider );

	// Check if provider is a window context provider
	boolean canSetActive = true;
	if (provider instanceof IDebugContextProvider2) {
	canSetActive = ((IDebugContextProvider2) provider).isWindowContextProvider();
	}
	// Make the provider active if matches the active part. Otherwise, it
	// may still become the active provider if fProviders.isEmpty().
	if (canSetActive) {
	IWorkbenchPart activePart = null;
	IWorkbenchPage activePage = fWindow.getActivePage();
	if (activePage != null) {
	activePart = activePage.getActivePart();
	}
	canSetActive = (activePart == null && part == null) \|\| (activePart != null && activePart.equals(part));
	}

	if (canSetActive) {
	fProviders.add(0, provider);
	} else {
	fProviders.add(provider);
	}
	notify(provider);
	provider.addDebugContextListener(this);
	}

	public synchronized void removeDebugContextProvider(IDebugContextProvider provider) {
	int index = fProviders.indexOf(provider);
	if (index >= 0) {
	fProvidersByPartId.remove( getCombinedPartId(provider.getPart()) );
	fProviders.remove(index);
	IDebugContextProvider activeProvider = getActiveProvider();
	if (index == 0) {
	if (activeProvider != null) {
	notify(activeProvider);
	} else {
	// Removed last provider. Send empty selection to all listeners.
	notify(new DebugContextEvent(provider, StructuredSelection.EMPTY, DebugContextEvent.ACTIVATED));
	}
	} else {
	// Notify listeners of the removed provider with the active window context.
	notifyPart(provider.getPart(),
	new DebugContextEvent(activeProvider, getActiveContext(), DebugContextEvent.ACTIVATED));
	}
	}
	provider.removeDebugContextListener(this);
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService#addDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener)
	*/
	public void addDebugContextListener(IDebugContextListener listener) {
	addDebugContextListener(listener, null);
	}

	public void addPostDebugContextListener(IDebugContextListener listener, String partId) {
	ListenerList list = (ListenerList) fPostListenersByPartId.get(partId);
	if (list == null) {
	list = new ListenerList();
	fPostListenersByPartId.put(partId, list);
	}
	list.add(listener);
	}

	public void addPostDebugContextListener(IDebugContextListener listener) {
	addPostDebugContextListener(listener, null);
	}

	public void removePostDebugContextListener(IDebugContextListener listener, String partId) {
	ListenerList list = (ListenerList) fPostListenersByPartId.get(partId);
	if (list != null) {
	list.remove(listener);
	}
	}

	public void removePostDebugContextListener(IDebugContextListener listener) {
	removePostDebugContextListener(listener, null);
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService#removeDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener)
	*/
	public void removeDebugContextListener(IDebugContextListener listener) {
	removeDebugContextListener(listener, null);
	}

	/**
	* Notifies listeners of the context in the specified provider.
	*
	* @param provdier context provider
	*/
	protected void notify(IDebugContextProvider provdier) {
	ISelection activeContext = provdier.getActiveContext();
	if (activeContext == null) {
	activeContext = new StructuredSelection();
	}
	notify(new DebugContextEvent(provdier, activeContext, DebugContextEvent.ACTIVATED));
	}

	protected void notify(DebugContextEvent event) {
	// Allow handling for case where getActiveProvider() == null.
	// This can happen upon removeContextProvider() called on last available
	// provider (bug 360637).
	IDebugContextProvider provider = getActiveProvider();
	IWorkbenchPart part = event.getDebugContextProvider().getPart();

	// Once for listeners
	if (provider == null \|\| provider == event.getDebugContextProvider()) {
	notify(event, getListeners(null));
	}
	if (part != null) {
	notify(event, getListeners(part));
	}

	// Again for post-listeners
	if (provider == null \|\| provider == event.getDebugContextProvider()) {
	notify(event, getPostListeners(null));
	}
	if (part != null) {
	notify(event, getPostListeners(part));
	}
	}

	protected void notifyPart(IWorkbenchPart part, DebugContextEvent event) {
	if (part != null) {
	notify(event, getListeners(part));
	notify(event, getPostListeners(part));
	}
	}

	protected void notify(final DebugContextEvent event, Object[] listeners) {
	for (int i = 0; i < listeners.length; i++) {
	final IDebugContextListener listener = (IDebugContextListener) listeners[i];
	SafeRunner.run(new ISafeRunnable() {
	public void run() throws Exception {
	listener.debugContextChanged(event);
	}
	public void handleException(Throwable exception) {
	DebugUIPlugin.log(exception);
	}
	});
	}
	}

	protected Object[] getListeners(IWorkbenchPart part) {
	String id = null;
	if (part != null) {
	id = getCombinedPartId(part);
	ListenerList listenerList = (ListenerList)fListenersByPartId.get(id);
	return listenerList != null ? listenerList.getListeners() : new Object[0];
	} else {
	List retVal = new ArrayList();
	retVal.addAll(Arrays.asList(((ListenerList)fListenersByPartId.get(null)).getListeners()) );
	outer: for (Iterator itr = fListenersByPartId.keySet().iterator(); itr.hasNext();) {
	String listenerPartId = (String)itr.next();
	for (int i = 0; i < fProviders.size(); i++) {
	String providerPartId = getCombinedPartId(((IDebugContextProvider)fProviders.get(i)).getPart());
	if ((listenerPartId == null && providerPartId == null) \|\|
	(listenerPartId != null && listenerPartId.equals(providerPartId)))
	{
	continue outer;
	}
	}

	List toAdd = Arrays.asList(((ListenerList)fListenersByPartId.get(listenerPartId)).getListeners());
	for (Iterator addItr = toAdd.iterator(); addItr.hasNext();) {
	Object element = addItr.next();
	if (!retVal.contains(element)) retVal.add(element);

	}
	}
	return retVal.toArray();
	}
	}

	protected Object[] getPostListeners(IWorkbenchPart part) {
	String id = null;
	if (part != null) {
	id = getCombinedPartId(part);
	ListenerList listenerList = (ListenerList)fPostListenersByPartId.get(id);
	return listenerList != null ? listenerList.getListeners() : new Object[0];
	} else {
	List retVal = new ArrayList();
	ListenerList postListenersList = (ListenerList)fPostListenersByPartId.get(null);
	if (postListenersList != null) {
	retVal.addAll( Arrays.asList(postListenersList.getListeners()) );
	}

	outer: for (Iterator itr = fPostListenersByPartId.keySet().iterator(); itr.hasNext();) {
	String listenerPartId = (String)itr.next();
	for (int i = 0; i < fProviders.size(); i++) {
	String providerPartId = getCombinedPartId(((IDebugContextProvider)fProviders.get(i)).getPart());
	if ((listenerPartId == null && providerPartId == null) \|\|
	(listenerPartId != null && listenerPartId.equals(providerPartId)))
	{
	continue outer;
	}
	}
	retVal.addAll( Arrays.asList(((ListenerList)fPostListenersByPartId.get(listenerPartId)).getListeners()) );
	}
	return retVal.toArray();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService#addDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String)
	*/
	public synchronized void addDebugContextListener(IDebugContextListener listener, String partId) {
	ListenerList list = (ListenerList) fListenersByPartId.get(partId);
	if (list == null) {
	list = new ListenerList();
	fListenersByPartId.put(partId, list);
	}
	list.add(listener);
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService#removeDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String)
	*/
	public void removeDebugContextListener(IDebugContextListener listener, String partId) {
	ListenerList list = (ListenerList) fListenersByPartId.get(partId);
	if (list != null) {
	list.remove(listener);
	if (list.size() == 0)
	fListenersByPartId.remove(partId);
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService#getActiveContext(java.lang.String)
	*/
	public ISelection getActiveContext(String partId) {
	IDebugContextProvider provider = (IDebugContextProvider) fProvidersByPartId.get(partId);
	if (provider != null) {
	return provider.getActiveContext();
	}
	return getActiveContext();
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService#getActiveContext()
	*/
	public ISelection getActiveContext() {
	IDebugContextProvider activeProvider = getActiveProvider();
	if (activeProvider != null) {
	return activeProvider.getActiveContext();
	}
	return null;
	}

	/**
	* Returns the active provider or <code>null</code>
	*
	* @return active provider or <code>null</code>
	*/
	private IDebugContextProvider getActiveProvider() {
	if (!fProviders.isEmpty()) {
	return (IDebugContextProvider)fProviders.get(0);
	}
	return null;
	}

	/* (non-Javadoc)
	* @see org.eclipse.ui.IPartListener2#partActivated(org.eclipse.ui.IWorkbenchPartReference)
	*/
	public void partActivated(IWorkbenchPartReference partRef) {
	IDebugContextProvider provider = (IDebugContextProvider) fProvidersByPartId.get(partRef.getId());
	if (provider != null) {
	boolean canSetActive = true;
	if (provider instanceof IDebugContextProvider2) {
	canSetActive = ((IDebugContextProvider2) provider).isWindowContextProvider();
	}

	if (canSetActive) {
	int index = fProviders.indexOf(provider);
	if (index > 0) {
	fProviders.remove(index);
	fProviders.add(0, provider);
	notify(provider);
	}
	}
	}

	}

	/* (non-Javadoc)
	* @see org.eclipse.ui.IPartListener2#partBroughtToTop(org.eclipse.ui.IWorkbenchPartReference)
	*/
	public void partBroughtToTop(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	* @see org.eclipse.ui.IPartListener2#partClosed(org.eclipse.ui.IWorkbenchPartReference)
	*/
	public synchronized void partClosed(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	* @see org.eclipse.ui.IPartListener2#partDeactivated(org.eclipse.ui.IWorkbenchPartReference)
	*/
	public void partDeactivated(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	* @see org.eclipse.ui.IPartListener2#partOpened(org.eclipse.ui.IWorkbenchPartReference)
	*/
	public void partOpened(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	* @see org.eclipse.ui.IPartListener2#partHidden(org.eclipse.ui.IWorkbenchPartReference)
	*/
	public void partHidden(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	* @see org.eclipse.ui.IPartListener2#partVisible(org.eclipse.ui.IWorkbenchPartReference)
	*/
	public void partVisible(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	* @see org.eclipse.ui.IPartListener2#partInputChanged(org.eclipse.ui.IWorkbenchPartReference)
	*/
	public void partInputChanged(IWorkbenchPartReference partRef) {
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.internal.ui.contexts.provisional.IDebugContextEventListener#contextEvent(org.eclipse.debug.internal.ui.contexts.provisional.DebugContextEvent)
	*/
	public void debugContextChanged(DebugContextEvent event) {
	notify(event);
	}

	private String getCombinedPartId(IWorkbenchPart part) {
	if (part == null) {
	return null;
	} else if (part.getSite() instanceof IViewSite) {
	IViewSite site = (IViewSite)part.getSite();
	return getCombinedPartId(site.getId(), site.getSecondaryId());

	} else {
	return part.getSite().getId();
	}
	}

	private String getCombinedPartId(String id, String secondaryId) {
	return id + (secondaryId != null ? ":" + secondaryId : ""); //$NON-NLS-1$//$NON-NLS-2$
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService2#addDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String, java.lang.String)
	*/
	public void addDebugContextListener(IDebugContextListener listener, String partId, String partSecondaryId) {
	addDebugContextListener(listener, getCombinedPartId(partId, partSecondaryId));
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService2#removeDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String, java.lang.String)
	*/
	public void removeDebugContextListener(IDebugContextListener listener, String partId, String partSecondaryId) {
	removeDebugContextListener(listener, getCombinedPartId(partId, partSecondaryId));
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService2#addPostDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String, java.lang.String)
	*/
	public void addPostDebugContextListener(IDebugContextListener listener, String partId, String partSecondaryId) {
	addPostDebugContextListener(listener, getCombinedPartId(partId, partSecondaryId));
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService2#removePostDebugContextListener(org.eclipse.debug.ui.contexts.IDebugContextListener, java.lang.String, java.lang.String)
	*/
	public void removePostDebugContextListener(IDebugContextListener listener, String partId, String partSecondaryId) {
	removePostDebugContextListener(listener, getCombinedPartId(partId, partSecondaryId));
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.ui.contexts.IDebugContextService2#getActiveContext(java.lang.String, java.lang.String)
	*/
	public ISelection getActiveContext(String partId, String partSecondaryId) {
	return getActiveContext(getCombinedPartId(partId, partSecondaryId));
	}
	}