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/*******************************************************************************
* Copyright (c) 2006 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.debug.internal.ui.commands.actions;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.debug.internal.ui.commands.provisional.IBooleanRequestMonitor;
import org.eclipse.debug.internal.ui.commands.provisional.IDebugCommand;
import org.eclipse.debug.internal.ui.contexts.DebugContextManager;
import org.eclipse.debug.internal.ui.contexts.provisional.IDebugContextListener;
import org.eclipse.debug.internal.ui.contexts.provisional.IDebugContextService;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWindowListener;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
/**
* Updates commands for a window. Coalesces update requests by command type.
*
* @since 3.3
*/
public class DebugCommandService implements IDebugContextListener {
/**
* Maps command types to update monitors
*/
private Map fCommandUpdates = new HashMap();
/**
* Window this service is for.
*/
private IWorkbenchWindow fWindow = null;
/**
* The context service for this command service.
*/
private IDebugContextService fContextService = null;
/**
* Service per window
*/
private static Map fgServices = new HashMap();
/**
* Returns the service for a window.
*
* @param window
* @return service
*/
public synchronized static DebugCommandService getService(IWorkbenchWindow window) {
DebugCommandService service = (DebugCommandService) fgServices.get(window);
if (service == null) {
service = new DebugCommandService(window);
fgServices.put(window, service);
}
return service;
}
public DebugCommandService(IWorkbenchWindow window) {
fWindow = window;
fContextService = DebugContextManager.getDefault().getContextService(window);
fContextService.addPostDebugContextListener(this);
PlatformUI.getWorkbench().addWindowListener(new IWindowListener() {
public void windowOpened(IWorkbenchWindow window) {
}
public void windowDeactivated(IWorkbenchWindow window) {
}
public void windowClosed(IWorkbenchWindow window) {
if (fWindow == window) {
dispose();
}
}
public void windowActivated(IWorkbenchWindow window) {
}
});
}
private void dispose() {
fContextService.removeDebugContextListener(this);
fgServices.remove(fWindow);
fCommandUpdates.clear();
fWindow = null;
}
/**
* Updates the given command type after the next context change.
*
* @param commandType
* @param monitor
*/
public void postUpdateCommand(Class commandType, IBooleanRequestMonitor monitor) {
ProxyBooleanRequestMonitor proxy = (ProxyBooleanRequestMonitor) fCommandUpdates.get(commandType);
if (proxy == null) {
proxy = new ProxyBooleanRequestMonitor();
fCommandUpdates.put(commandType, proxy);
}
proxy.addMonitor(monitor);
}
/**
* Updates the given command type based on the active context.
*
* @param commandType
* @param requestMonitor
*/
public void updateCommand(Class commandType, IBooleanRequestMonitor requestMonitor) {
ISelection context = fContextService.getActiveContext();
if (context instanceof IStructuredSelection && !context.isEmpty()) {
Object[] elements = ((IStructuredSelection)context).toArray();
ProxyBooleanRequestMonitor monitor = new ProxyBooleanRequestMonitor();
monitor.addMonitor(requestMonitor);
updateCommand(commandType, elements, monitor);
} else {
requestMonitor.setCanceled(true);
requestMonitor.done();
}
}
private void postUpdate(ISelection context) {
if (context instanceof IStructuredSelection && !context.isEmpty()) {
Object[] elements = ((IStructuredSelection)context).toArray();
Iterator iterator = fCommandUpdates.entrySet().iterator();
while (iterator.hasNext()) {
Entry entry = (Entry) iterator.next();
Class commandType = (Class)entry.getKey();
ProxyBooleanRequestMonitor monitor = (ProxyBooleanRequestMonitor) entry.getValue();
updateCommand(commandType, elements, monitor);
}
} else {
Iterator iterator = fCommandUpdates.values().iterator();
while (iterator.hasNext()) {
ProxyBooleanRequestMonitor monitor = (ProxyBooleanRequestMonitor) iterator.next();
monitor.setCanceled(true);
monitor.done();
}
}
fCommandUpdates.clear();
}
/**
* Updates the given command type for the specified elements.
*
* @param commandType command class to update
* @param elements elements to update for
* @param monitor status monitor
*/
private void updateCommand(Class commandType, Object[] elements, ProxyBooleanRequestMonitor monitor) {
IDebugCommand[] commands = new IDebugCommand[elements.length];
int numVoters = 0;
for (int i = 0; i < elements.length; i++) {
Object element = elements[i];
if (element instanceof IAdaptable) {
IDebugCommand command = (IDebugCommand) ((IAdaptable)element).getAdapter(commandType);
if (command != null) {
commands[i] = command;
numVoters++;
} else {
monitor.setCanceled(true);
monitor.done();
return;
}
}
}
if (!monitor.isCanceled()) {
monitor.setNumVoters(numVoters);
for (int i = 0; i < commands.length; i++) {
IDebugCommand command = commands[i];
command.canExecute(elements[i], monitor);
}
}
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.contexts.provisional.IDebugContextListener#contextActivated(org.eclipse.jface.viewers.ISelection, org.eclipse.ui.IWorkbenchPart, org.eclipse.debug.internal.ui.contexts.provisional.IDebugContextService)
*/
public void contextActivated(ISelection selection, IWorkbenchPart part) {
postUpdate(selection);
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.contexts.provisional.IDebugContextListener#contextChanged(org.eclipse.jface.viewers.ISelection, org.eclipse.ui.IWorkbenchPart, org.eclipse.debug.internal.ui.contexts.provisional.IDebugContextService)
*/
public void contextChanged(ISelection selection, IWorkbenchPart part) {
postUpdate(selection);
}
}
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