/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.debug.internal.core;


import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;

import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IMarkerDelta;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.IWorkspaceRunnable;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.IBreakpointListener;
import org.eclipse.debug.core.IBreakpointManager;
import org.eclipse.debug.core.IBreakpointsListener;
import org.eclipse.debug.core.model.IBreakpoint;

/**
 * The breakpoint manager manages all registered breakpoints
 * for the debug plugin. It is instantiated by the debug plugin at startup.
 *
 * @see IBreakpointManager
 */
public class BreakpointManager implements IBreakpointManager, IResourceChangeListener {
	
	/**
	 * Constants for breakpoint add/remove/change updates
	 */
	private final static int ADDED = 0;
	private final static int REMOVED = 1;
	private final static int CHANGED = 2;
	
	/**
	 * String constants corresponding to XML extension keys
	 */
	private final static String CLASS = "class"; //$NON-NLS-1$
	
	/**
	 * Attribute name for the <code>"markerType"</code> attribute of
	 * a breakpoint extension.
	 */
	private static final String MARKER_TYPE= "markerType";	 //$NON-NLS-1$	

	/**
	 * A collection of breakpoints registered with this manager.
	 */
	private Vector fBreakpoints= null;
	
	/**
	 * Collection of breakpoints being added currently. Used to 
	 * suppress change notication of "REGISTERED" attribute when
	 * being added.
	 */
	private List fSuppressChange = new ArrayList();
	
	/**
	 * A table of breakpoint extension points, keyed by
	 * marker type
	 * key: a marker type
	 * value: the breakpoint extension which corresponds to that marker type
	 */
	private HashMap fBreakpointExtensions;
	
	/**
	 * Collection of markers that associates markers to breakpoints
	 * key: a marker
	 * value: the breakpoint which contains that marker
	 */	
	private HashMap fMarkersToBreakpoints;

	/**
	 * Collection of breakpoint listeners.
	 */
	private ListenerList fBreakpointListeners= new ListenerList(6);
		
	/**
	 * Collection of (multi) breakpoint listeners.
	 */
	private ListenerList fBreakpointsListeners= new ListenerList(6);	
	
	/**
	 * Singleton resource delta visitor which handles marker
	 * additions, changes, and removals.
	 */
	private static BreakpointManagerVisitor fgVisitor;

	/**
	 * Constructs a new breakpoint manager.
	 */
	public BreakpointManager() {
		fMarkersToBreakpoints= new HashMap(10);	
		fBreakpointExtensions = new HashMap(15);	
	}
	
	/**
	 * Loads all the breakpoints on the given resource.
	 * 
	 * @param resource the resource which contains the breakpoints
	 */
	private void loadBreakpoints(IResource resource) throws CoreException {
		initBreakpointExtensions();
		IMarker[] markers= getPersistedMarkers(resource);
		List added = new ArrayList();
		for (int i = 0; i < markers.length; i++) {
			IMarker marker= markers[i];
			try {
				IBreakpoint breakpoint = createBreakpoint(marker);
				if (breakpoint.isRegistered()) {
					added.add(breakpoint);
				}
			} catch (DebugException e) {
				DebugPlugin.log(e);
			}
		}
		addBreakpoints((IBreakpoint[])added.toArray(new IBreakpoint[added.size()]));
	}
	
	/**
	 * Returns the persisted markers associated with the given resource.
	 * 
	 * Delete any invalid breakpoint markers. This is done at startup rather
	 * than shutdown, since the changes made at shutdown are not persisted as
	 * the workspace state has already been saved. See bug 7683.
	 * 
	 * Since the <code>TRANSIENT</code> marker attribute/feature has been added,
	 * we no longer have to manully delete non-persisted markers - the platform
	 * does this for us (at shutdown, transient markers are not saved). However,
	 * the code is still present to delete non-persisted markers from old
	 * workspaces.
	 */
	protected IMarker[] getPersistedMarkers(IResource resource) throws CoreException {
		IMarker[] markers= resource.findMarkers(IBreakpoint.BREAKPOINT_MARKER, true, IResource.DEPTH_INFINITE);
		final List delete = new ArrayList();
		List persisted= new ArrayList();
		for (int i = 0; i < markers.length; i++) {
			IMarker marker= markers[i];
			// ensure the marker has a valid model identifier attribute
			// and delete the breakpoint if not
			String modelId = marker.getAttribute(IBreakpoint.ID, null);
			if (modelId == null) {
				// marker with old/invalid format - delete
				delete.add(marker);
			} else if (!marker.getAttribute(IBreakpoint.PERSISTED, true)) {
				// the breakpoint is marked as not to be persisted,
				// schedule for deletion
				delete.add(marker);
			} else {
				persisted.add(marker);
			}
		}
		// delete any markers that are not to be restored
		if (!delete.isEmpty()) {
			IWorkspaceRunnable wr = new IWorkspaceRunnable() {
				public void run(IProgressMonitor pm) throws CoreException {
					ResourcesPlugin.getWorkspace().deleteMarkers((IMarker[])delete.toArray(new IMarker[delete.size()]));
				}
			};
			fork(wr);
		}
		return (IMarker[])persisted.toArray(new IMarker[persisted.size()]);
	}
	
	/**
	 * Removes this manager as a resource change listener
	 * and removes all breakpoint listeners.
	 */
	public void shutdown() {
		getWorkspace().removeResourceChangeListener(this);
		fBreakpointListeners.removeAll();
	}

	/**
	 * Find the defined breakpoint extensions and cache them for use in recreating
	 * breakpoints from markers.
	 */
	private void initBreakpointExtensions() {
		IExtensionPoint ep= DebugPlugin.getDefault().getDescriptor().getExtensionPoint(DebugPlugin.EXTENSION_POINT_BREAKPOINTS);
		IConfigurationElement[] elements = ep.getConfigurationElements();
		for (int i= 0; i < elements.length; i++) {
			String markerType = elements[i].getAttribute(MARKER_TYPE);
			String className = elements[i].getAttribute(CLASS);
			if (markerType == null) {
				invalidBreakpointExtension(MessageFormat.format(DebugCoreMessages.getString("BreakpointManager.Breakpoint_extension_{0}_missing_required_attribute__markerType_1"), new String[]{elements[i].getDeclaringExtension().getUniqueIdentifier()})); //$NON-NLS-1$
			} else if (className == null){
				invalidBreakpointExtension(MessageFormat.format(DebugCoreMessages.getString("BreakpointManager.Breakpoint_extension_{0}_missing_required_attribute__class_2"), new String[]{elements[i].getDeclaringExtension().getUniqueIdentifier()})); //$NON-NLS-1$
			} else {
				fBreakpointExtensions.put(markerType, elements[i]);
			}
		}
	}
	
	private void invalidBreakpointExtension(String message) {
		IStatus status = new Status(IStatus.ERROR, DebugPlugin.getUniqueIdentifier(), DebugPlugin.INTERNAL_ERROR, message, null);
		DebugPlugin.log(status);
	}

	/**
	 * Convenience method to get the workspace
	 */
	private IWorkspace getWorkspace() {
		return ResourcesPlugin.getWorkspace();
	}

	/**
	 * @see IBreakpointManager#getBreakpoint(IMarker)
	 */
	public IBreakpoint getBreakpoint(IMarker marker) {
		// ensure that breakpoints are initialized
		getBreakpoints0();
		return (IBreakpoint)fMarkersToBreakpoints.get(marker);
	}

	/**
	 * @see IBreakpointManager#getBreakpoints()
	 */
	public IBreakpoint[] getBreakpoints() {
		Vector breakpoints= getBreakpoints0();
		IBreakpoint[] temp= new IBreakpoint[breakpoints.size()];
		breakpoints.copyInto(temp);
		return temp;
	}
	
	/**
	 * The BreakpointManager waits to load the breakpoints
	 * of the workspace until a request is made to retrieve the 
	 * breakpoints.
	 */
	private Vector getBreakpoints0() {
		if (fBreakpoints == null) {
			initializeBreakpoints();
		}
		return fBreakpoints;
	}	
	
	/**
	 * @see IBreakpointManager#getBreakpoints(String)
	 */
	public IBreakpoint[] getBreakpoints(String modelIdentifier) {
		Vector allBreakpoints= getBreakpoints0();
		ArrayList temp= new ArrayList(allBreakpoints.size());
		Iterator breakpoints= allBreakpoints.iterator();
		while (breakpoints.hasNext()) {
			IBreakpoint breakpoint= (IBreakpoint) breakpoints.next();
			String id= breakpoint.getModelIdentifier();
			if (id != null && id.equals(modelIdentifier)) {
				temp.add(breakpoint);
			}
		}
		return (IBreakpoint[]) temp.toArray(new IBreakpoint[temp.size()]);
	}

	/**
	 * Loads the list of breakpoints from the breakpoint markers in the
	 * workspace. Start listening to resource deltas.
	 */
	private void initializeBreakpoints() {
		setBreakpoints(new Vector(10));
		try {
			loadBreakpoints(getWorkspace().getRoot());
			getWorkspace().addResourceChangeListener(this, IResourceChangeEvent.POST_AUTO_BUILD);
		} catch (CoreException ce) {
			DebugPlugin.log(ce);
			setBreakpoints(new Vector(0));
		} 
	}
	
	/**
	 * @see IBreakpointManager#isRegistered(IBreakpoint)
	 */
	public boolean isRegistered(IBreakpoint breakpoint) {
		return getBreakpoints0().contains(breakpoint);
	}

	
	/**
	 * @see IBreakpointManager#removeBreakpoint(IBreakpoint, boolean)
	 */
	public void removeBreakpoint(IBreakpoint breakpoint, boolean delete) throws CoreException {
		removeBreakpoints(new IBreakpoint[]{breakpoint}, delete);
	}
	
	/**
	 * @see IBreakpointManager#removeBreakpoints(IBreakpoint[], boolean)
	 */
	public void removeBreakpoints(IBreakpoint[] breakpoints, final boolean delete) throws CoreException {
		final List remove = new ArrayList(breakpoints.length);
		for (int i = 0; i < breakpoints.length; i++) {
			IBreakpoint breakpoint = breakpoints[i];
			if (getBreakpoints0().contains(breakpoint)) {
				remove.add(breakpoint);
			}
		}
		if (!remove.isEmpty()) {
			Iterator iter = remove.iterator();
			while (iter.hasNext()) {
				IBreakpoint breakpoint = (IBreakpoint)iter.next();
				getBreakpoints0().remove(breakpoint);
				fMarkersToBreakpoints.remove(breakpoint.getMarker());
			}
			fireUpdate(remove, null, REMOVED);
			IWorkspaceRunnable r = new IWorkspaceRunnable() {
				public void run(IProgressMonitor montitor) throws CoreException {
					Iterator iter = remove.iterator();
					while (iter.hasNext()) {
						IBreakpoint breakpoint = (IBreakpoint)iter.next();
						if (delete) {
							breakpoint.delete();
						} else {
							// if the breakpoint is being removed from the manager
							// because the project is closing, the breakpoint should
							// remain as registered, otherwise, the breakpoint should
							// be marked as deregistered
							IMarker marker = breakpoint.getMarker();
							if (marker.exists()) {
								IProject project = breakpoint.getMarker().getResource().getProject();
								if (project == null || project.isOpen()) {
									breakpoint.setRegistered(false);
								}
							}
						}
					}					
				}
			};
			getWorkspace().run(r, null);
		}
	}	
	
	/**
	 * Create a breakpoint for the given marker. The created breakpoint
	 * is of the type specified in the breakpoint extension associated
	 * with the given marker type.
	 * 
	 * @return a breakpoint on this marker
	 * @exception DebugException if breakpoint creation fails. Reasons for 
	 *  failure include:
	 * <ol>
	 * <li>The breakpoint manager cannot determine what kind of breakpoint
	 *     to instantiate for the given marker type</li>
	 * <li>A lower level exception occurred while accessing the given marker</li>
	 * </ol>
	 */
	private IBreakpoint createBreakpoint(IMarker marker) throws DebugException {
		IBreakpoint breakpoint= (IBreakpoint) fMarkersToBreakpoints.get(marker);
		if (breakpoint != null) {
			return breakpoint;
		}
		try {
			IConfigurationElement config = (IConfigurationElement)fBreakpointExtensions.get(marker.getType());
			if (config == null) {
				throw new DebugException(new Status(IStatus.ERROR, DebugPlugin.getUniqueIdentifier(), 
					DebugException.CONFIGURATION_INVALID, MessageFormat.format(DebugCoreMessages.getString("BreakpointManager.Missing_breakpoint_definition"), new String[] {marker.getType()}), null)); //$NON-NLS-1$
			}
			Object object = config.createExecutableExtension(CLASS);
			if (object instanceof IBreakpoint) {
				breakpoint = (IBreakpoint)object;
				breakpoint.setMarker(marker);
			} else {
				invalidBreakpointExtension(MessageFormat.format(DebugCoreMessages.getString("BreakpointManager.Class_{0}_specified_by_breakpoint_extension_{1}_does_not_implement_required_interface_IBreakpoint._3"), new String[]{config.getAttribute(CLASS), config.getDeclaringExtension().getUniqueIdentifier()})); //$NON-NLS-1$
			}
			return breakpoint;		
		} catch (CoreException e) {
			throw new DebugException(e.getStatus());
		}
	}	

	/**
	 * @see IBreakpointManager#addBreakpoint(IBreakpoint)
	 */
	public void addBreakpoint(IBreakpoint breakpoint) throws CoreException {
		addBreakpoints(new IBreakpoint[]{breakpoint});
	}
	
	/**
	 * @see IBreakpointManager#addBreakpoints(IBreakpoint[])
	 */
	public void addBreakpoints(IBreakpoint[] breakpoints) throws CoreException {
		List added = new ArrayList(breakpoints.length);
		final List update = new ArrayList();
		for (int i = 0; i < breakpoints.length; i++) {
			IBreakpoint breakpoint = breakpoints[i];
			if (!getBreakpoints0().contains(breakpoint)) {
				verifyBreakpoint(breakpoint);
				if (breakpoint.isRegistered()) {
					added.add(breakpoint);
					getBreakpoints0().add(breakpoint);
					fMarkersToBreakpoints.put(breakpoint.getMarker(), breakpoint);
				} else {
					// need to update the 'registered' attribute
					update.add(breakpoint);
				}
			}	
		}
		fireUpdate(added, null, ADDED);
		if (!update.isEmpty()) {
			IWorkspaceRunnable r = new IWorkspaceRunnable() {
				public void run(IProgressMonitor monitor) throws CoreException {
					Iterator iter = update.iterator();
					while (iter.hasNext()) {
						IBreakpoint breakpoint = (IBreakpoint)iter.next();
						getBreakpoints0().add(breakpoint);
						breakpoint.setRegistered(true);
						fMarkersToBreakpoints.put(breakpoint.getMarker(), breakpoint);						
					}
				}
			};
			// Need to suppress change notification, since this is really
			// an add notification			
			fSuppressChange.addAll(update);
			getWorkspace().run(r, null);
			fSuppressChange.removeAll(update);
			fireUpdate(update, null, ADDED);
		}			
	}	
	
	/**
	 * Returns whether change notification is to be suppressed for the given breakpoint.
	 * Used when adding breakpoints and changing the "REGISTERED" attribute.
	 * 
	 * @param breakpoint
	 * @return boolean whether change notification is suppressed
	 */
	protected boolean isChangeSuppressed(IBreakpoint breakpoint) {
		return fSuppressChange.contains(breakpoint);
	}
	
	/**
	 * @see IBreakpointManager#fireBreakpointChanged(IBreakpoint)
	 */
	public void fireBreakpointChanged(IBreakpoint breakpoint) {
		if (getBreakpoints0().contains(breakpoint)) {
			List changed = new ArrayList();
			changed.add(breakpoint);
			fireUpdate(changed, null, CHANGED);
		}
	}

	/**
	 * Verifies that the breakpoint marker has the minimal required attributes,
	 * and throws a debug exception if not.
	 */
	private void verifyBreakpoint(IBreakpoint breakpoint) throws DebugException {
		try {
			String id= breakpoint.getModelIdentifier();
			if (id == null) {
				throw new DebugException(new Status(IStatus.ERROR, DebugPlugin.getUniqueIdentifier(), 
					DebugException.CONFIGURATION_INVALID, DebugCoreMessages.getString("BreakpointManager.Missing_model_identifier"), null)); //$NON-NLS-1$
			}
		} catch (CoreException e) {
			throw new DebugException(e.getStatus());
		}
	}

	/**
	 * A resource has changed. Traverses the delta for breakpoint changes.
	 */
	public void resourceChanged(IResourceChangeEvent event) {
		IResourceDelta delta= event.getDelta();
		if (delta != null) {
			try {
				if (fgVisitor == null) {
					fgVisitor= new BreakpointManagerVisitor();
				}
				delta.accept(fgVisitor);
				fgVisitor.update();
			} catch (CoreException ce) {
				DebugPlugin.log(ce);
			}
		}
	}

	/**
	 * Visitor for handling resource deltas
	 */
	class BreakpointManagerVisitor implements IResourceDeltaVisitor {
		/**
		 * Moved markers
		 */
		private List fMoved = new ArrayList();
		/**
		 * Removed breakpoints
		 */
		private List fRemoved = new ArrayList();
		/**
		 * Changed breakpoints and associated marker deltas
		 */
		private List fChanged = new ArrayList();
		private List fChangedDeltas = new ArrayList();
		
		/**
		 * Resets the visitor for a delta traversal - empties
		 * collections of removed/changed breakpoints.
		 */
		protected void reset() {
			fMoved.clear();
			fRemoved.clear();
			fChanged.clear();
			fChangedDeltas.clear();
		}
		
		/**
		 * Performs updates on accumlated changes, and fires change notification after
		 * a traversal. Accumlated updates are reset.
		 */
		public void update() {
			if (!fMoved.isEmpty()) {
				// delete moved markers
				IWorkspaceRunnable wRunnable= new IWorkspaceRunnable() {
					public void run(IProgressMonitor monitor) throws CoreException {
						getWorkspace().deleteMarkers((IMarker[])fMoved.toArray(new IMarker[fMoved.size()]));
					}
				};
				try {
					getWorkspace().run(wRunnable, null);
				} catch (CoreException e) {
				}
			}
			if (!fRemoved.isEmpty()) {
				try {
					removeBreakpoints((IBreakpoint[])fRemoved.toArray(new IBreakpoint[fRemoved.size()]), false);
				} catch (CoreException e) {
					DebugPlugin.log(e);
				}
			}
			if (!fChanged.isEmpty()) {
				fireUpdate(fChanged, fChangedDeltas, CHANGED);
			}
			reset();
		} 
				
		/**
		 * @see IResourceDeltaVisitor#visit(IResourceDelta)
		 */
		public boolean visit(IResourceDelta delta) {
			if (delta == null) {
				return false;
			}
			if (0 != (delta.getFlags() & IResourceDelta.OPEN)) {
				handleProjectResourceOpenStateChange(delta.getResource());
				return false;
			}
			IMarkerDelta[] markerDeltas= delta.getMarkerDeltas();
			for (int i= 0; i < markerDeltas.length; i++) {
				IMarkerDelta markerDelta= markerDeltas[i];
				if (markerDelta.isSubtypeOf(IBreakpoint.BREAKPOINT_MARKER)) {
					switch (markerDelta.getKind()) {
						case IResourceDelta.ADDED :
							handleAddBreakpoint(delta, markerDelta.getMarker(), markerDelta);
							break;
						case IResourceDelta.REMOVED :
							handleRemoveBreakpoint(markerDelta.getMarker(), markerDelta);
							break;
						case IResourceDelta.CHANGED :
							handleChangeBreakpoint(markerDelta.getMarker(), markerDelta);
							break;
					}
				}
			}

			return true;
		}		

		/**
		 * Wrapper for handling adds
		 */
		protected void handleAddBreakpoint(IResourceDelta rDelta, final IMarker marker, IMarkerDelta mDelta) {
			if (0 != (rDelta.getFlags() & IResourceDelta.MOVED_FROM)) {
				// This breakpoint has actually been moved - already removed
				// from the Breakpoint manager during the remove callback.
				// Schedule the marker associated with the new resource for deletion.
				fMoved.add(marker);
			} else {
				// do nothing - we do not add until explicitly added
			}
		}
		
		/**
		 * Wrapper for handling removes
		 */
		protected void handleRemoveBreakpoint(IMarker marker, IMarkerDelta delta) {
			IBreakpoint breakpoint= getBreakpoint(marker);
			if (breakpoint != null) {
				fRemoved.add(breakpoint);
			}
		}

		/**
		 * Wrapper for handling changes
		 */
		protected void handleChangeBreakpoint(IMarker marker, IMarkerDelta delta) {
			final IBreakpoint breakpoint= getBreakpoint(marker);
			if (breakpoint != null && isRegistered(breakpoint) && !isChangeSuppressed(breakpoint)) {
				fChanged.add(breakpoint);
				fChangedDeltas.add(delta);
			}
		}
		
		/**
		 * A project has been opened or closed.  Updates the breakpoints for
		 * that project
		 */
		private void handleProjectResourceOpenStateChange(final IResource project) {
			if (!project.isAccessible()) {
				//closed
				Enumeration breakpoints= ((Vector)getBreakpoints0().clone()).elements();
				while (breakpoints.hasMoreElements()) {
					IBreakpoint breakpoint= (IBreakpoint) breakpoints.nextElement();
					IResource markerResource= breakpoint.getMarker().getResource();
					if (project.getFullPath().isPrefixOf(markerResource.getFullPath())) {
						fRemoved.add(breakpoint);
					}
				}
				return;
			} else {
				try {
					loadBreakpoints(project);
				} catch (CoreException e) {
					DebugPlugin.log(e);
				}
			}
		}		
	}

	/**
	 * @see IBreakpointManager#addBreakpointListener(IBreakpointListener)
	 */
	public void addBreakpointListener(IBreakpointListener listener) {
		fBreakpointListeners.add(listener);
	}

	/**
	 * @see IBreakpointManager#removeBreakpointListener(IBreakpointListener)
	 */
	public void removeBreakpointListener(IBreakpointListener listener) {
		fBreakpointListeners.remove(listener);
	}
	
	/**
	 * Notifies listeners of the adds/removes/changes
	 * 
	 * @param breakpoints associated breakpoints
	 * @param deltas or <code>null</code>
	 * @param update type of change
	 */
	private void fireUpdate(List breakpoints, List deltas, int update) {
		if (breakpoints.isEmpty()) {
			return; 
		}
		IBreakpoint[] bpArray = (IBreakpoint[])breakpoints.toArray(new IBreakpoint[breakpoints.size()]);
		IMarkerDelta[] deltaArray = new IMarkerDelta[bpArray.length];
		if (deltas != null) {
			deltaArray = (IMarkerDelta[])deltas.toArray(deltaArray);
		}
		// single listeners
		getBreakpointNotifier().notify(bpArray, deltaArray, update);
		
		// multi listeners
		getBreakpointsNotifier().notify(bpArray, deltaArray, update);
	}	

	protected void setBreakpoints(Vector breakpoints) {
		fBreakpoints = breakpoints;
	}
	
	protected void fork(final IWorkspaceRunnable wRunnable) {
		Runnable runnable= new Runnable() {
			public void run() {
				try {
					getWorkspace().run(wRunnable, null);
				} catch (CoreException ce) {
					DebugPlugin.log(ce);
				}
			}
		};
		new Thread(runnable).start();
	}		

	/**
	 * @see IBreakpointManager#hasBreakpoints()
	 */
	public boolean hasBreakpoints() {
		return !getBreakpoints0().isEmpty();
	}
	/**
	 * @see org.eclipse.debug.core.IBreakpointManager#addBreakpointListener(org.eclipse.debug.core.IBreakpointsListener)
	 */
	public void addBreakpointListener(IBreakpointsListener listener) {
		fBreakpointsListeners.add(listener);
	}

	/**
	 * @see org.eclipse.debug.core.IBreakpointManager#removeBreakpointListener(org.eclipse.debug.core.IBreakpointsListener)
	 */
	public void removeBreakpointListener(IBreakpointsListener listener) {
		fBreakpointsListeners.remove(listener);
	}

	private BreakpointNotifier getBreakpointNotifier() {
		return new BreakpointNotifier();
	}
	
	/**
	 * Notifies breakpoint listener (single breakpoint) in a safe runnable to
	 * handle exceptions.
	 */
	class BreakpointNotifier implements ISafeRunnable {
		
		private IBreakpointListener fListener;
		private int fType;
		private IMarkerDelta fDelta;
		private IBreakpoint fBreakpoint;
		
		/**
		 * @see org.eclipse.core.runtime.ISafeRunnable#handleException(java.lang.Throwable)
		 */
		public void handleException(Throwable exception) {
			IStatus status = new Status(IStatus.ERROR, DebugPlugin.getUniqueIdentifier(), DebugPlugin.INTERNAL_ERROR, DebugCoreMessages.getString("BreakpointManager.An_exception_occurred_during_breakpoint_change_notification._4"), exception); //$NON-NLS-1$
			DebugPlugin.log(status);
		}

		/**
		 * @see org.eclipse.core.runtime.ISafeRunnable#run()
		 */
		public void run() throws Exception {
			switch (fType) {
				case ADDED:
					fListener.breakpointAdded(fBreakpoint);
					break;
				case REMOVED:
					fListener.breakpointRemoved(fBreakpoint, fDelta);
					break;
				case CHANGED:
					fListener.breakpointChanged(fBreakpoint, fDelta);		
					break;
			}			
		}

		/**
		 * Notifies the listeners of the add/change/remove
		 * 
		 * @param breakpoints the breakpoints that changed
		 * @param deltas the deltas associated with the change
		 * @param update the type of change
		 */
		public void notify(IBreakpoint[] breakpoints, IMarkerDelta[] deltas, int update) {
			fType = update;
			Object[] copiedListeners= fBreakpointListeners.getListeners();
			for (int i= 0; i < copiedListeners.length; i++) {
				fListener = (IBreakpointListener)copiedListeners[i];
				for (int j = 0; j < breakpoints.length; j++) {
					fBreakpoint = breakpoints[j];
					fDelta = deltas[j];
					Platform.run(this);				
				}
			}
			fListener = null;
			fDelta = null;
			fBreakpoint = null;			
		}
	}
	
	private BreakpointsNotifier getBreakpointsNotifier() {
		return new BreakpointsNotifier();
	}
	
	/**
	 * Notifies breakpoint listener (multiple breakpoints) in a safe runnable to
	 * handle exceptions.
	 */
	class BreakpointsNotifier implements ISafeRunnable {
		
		private IBreakpointsListener fListener;
		private int fType;
		private IMarkerDelta[] fDeltas;
		private IBreakpoint[] fBreakpoints;
		
		/**
		 * @see org.eclipse.core.runtime.ISafeRunnable#handleException(java.lang.Throwable)
		 */
		public void handleException(Throwable exception) {
			IStatus status = new Status(IStatus.ERROR, DebugPlugin.getUniqueIdentifier(), DebugPlugin.INTERNAL_ERROR, DebugCoreMessages.getString("BreakpointManager.An_exception_occurred_during_breakpoint_change_notification._5"), exception); //$NON-NLS-1$
			DebugPlugin.log(status);
		}

		/**
		 * @see org.eclipse.core.runtime.ISafeRunnable#run()
		 */
		public void run() throws Exception {
			switch (fType) {
				case ADDED:
					fListener.breakpointsAdded(fBreakpoints);
					break;
				case REMOVED:
					fListener.breakpointsRemoved(fBreakpoints, fDeltas);
					break;
				case CHANGED:
					fListener.breakpointsChanged(fBreakpoints, fDeltas);		
					break;
			}			
		}

		/**
		 * Notifies the listeners of the adds/changes/removes
		 * 
		 * @param breakpoints the breakpoints that changed
		 * @param deltas the deltas associated with the changed breakpoints
		 * @param update the type of change
		 */
		public void notify(IBreakpoint[] breakpoints, IMarkerDelta[] deltas, int update) {
			fType = update;
			fBreakpoints = breakpoints;
			fDeltas = deltas;
			Object[] copiedListeners = fBreakpointsListeners.getListeners();
			for (int i= 0; i < copiedListeners.length; i++) {
				fListener = (IBreakpointsListener)copiedListeners[i];
				Platform.run(this);
			}
			fDeltas = null;
			fBreakpoints = null;
			fListener = null;
		}
	}	
}