| /******************************************************************************* |
| * Copyright (c) 2006, 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.debug.internal.ui.commands.actions; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| |
| import org.eclipse.core.runtime.jobs.Job; |
| import org.eclipse.debug.core.DebugPlugin; |
| import org.eclipse.debug.core.commands.IDebugCommandHandler; |
| import org.eclipse.debug.ui.DebugUITools; |
| import org.eclipse.debug.ui.contexts.DebugContextEvent; |
| import org.eclipse.debug.ui.contexts.IDebugContextListener; |
| import org.eclipse.debug.ui.contexts.IDebugContextService; |
| import org.eclipse.jface.action.Action; |
| import org.eclipse.jface.action.IAction; |
| import org.eclipse.jface.viewers.ISelection; |
| import org.eclipse.jface.viewers.IStructuredSelection; |
| import org.eclipse.ui.IWindowListener; |
| 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 actions to update |
| */ |
| 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 = DebugUITools.getDebugContextManager().getContextService(window); |
| fContextService.addPostDebugContextListener(this); |
| PlatformUI.getWorkbench().addWindowListener(new IWindowListener() { |
| |
| public void windowOpened(IWorkbenchWindow w) { |
| } |
| |
| public void windowDeactivated(IWorkbenchWindow w) { |
| } |
| |
| public void windowClosed(IWorkbenchWindow w) { |
| if (fWindow == w) { |
| dispose(); |
| } |
| } |
| |
| public void windowActivated(IWorkbenchWindow w) { |
| } |
| |
| }); |
| } |
| |
| 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, Action action) { |
| synchronized (fCommandUpdates) { |
| Job.getJobManager().cancel(commandType); |
| List actions = (List) fCommandUpdates.get(commandType); |
| if (actions == null) { |
| actions = new ArrayList(); |
| fCommandUpdates.put(commandType, actions); |
| } |
| actions.add(action); |
| } |
| } |
| |
| /** |
| * Updates the given command type based on the active context. |
| * |
| * @param commandType |
| * @param requestMonitor |
| */ |
| public void updateCommand(Class commandType, IAction action) { |
| ISelection context = fContextService.getActiveContext(); |
| if (context instanceof IStructuredSelection && !context.isEmpty()) { |
| Object[] elements = ((IStructuredSelection)context).toArray(); |
| updateCommand(commandType, elements, new IAction[]{action}); |
| } else { |
| action.setEnabled(false); |
| } |
| } |
| |
| private void postUpdate(ISelection context) { |
| Map commands = null; |
| synchronized (fCommandUpdates) { |
| commands = fCommandUpdates; |
| fCommandUpdates = new HashMap(commands.size()); |
| } |
| if (context instanceof IStructuredSelection && !context.isEmpty()) { |
| Object[] elements = ((IStructuredSelection)context).toArray(); |
| Iterator iterator = commands.entrySet().iterator(); |
| while (iterator.hasNext()) { |
| Entry entry = (Entry) iterator.next(); |
| Class commandType = (Class)entry.getKey(); |
| List actions = (List) entry.getValue(); |
| updateCommand(commandType, elements, (IAction[]) actions.toArray(new IAction[actions.size()])); |
| } |
| } else { |
| Iterator iterator = commands.values().iterator(); |
| while (iterator.hasNext()) { |
| List actionList = (List) iterator.next(); |
| Iterator actions = actionList.iterator(); |
| while (actions.hasNext()) { |
| ((IAction)actions.next()).setEnabled(false); |
| } |
| } |
| } |
| commands.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 handlerType, Object[] elements, IAction[] actions) { |
| if (elements.length == 1) { |
| // usual case - one element |
| Object element = elements[0]; |
| IDebugCommandHandler handler = getHandler(element, handlerType); |
| if (handler != null) { |
| UpdateActionsRequest request = new UpdateActionsRequest(elements, actions); |
| handler.canExecute(request); |
| return; |
| } |
| } else { |
| Map map = collate(elements, handlerType); |
| if (map != null) { |
| ActionsUpdater updater = new ActionsUpdater(actions, map.size()); |
| Iterator entries = map.entrySet().iterator(); |
| while (entries.hasNext()) { |
| Entry entry = (Entry) entries.next(); |
| IDebugCommandHandler handler = (IDebugCommandHandler) entry.getKey(); |
| List list = (List) entry.getValue(); |
| UpdateHandlerRequest request = new UpdateHandlerRequest(list.toArray(), updater); |
| handler.canExecute(request); |
| } |
| return; |
| } |
| } |
| // ABORT - no command processors |
| for (int i = 0; i < actions.length; i++) { |
| actions[i].setEnabled(false); |
| } |
| } |
| |
| /** |
| * 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 |
| */ |
| public boolean executeCommand(Class handlerType, Object[] elements, ICommandParticipant participant) { |
| if (elements.length == 1) { |
| // usual case - one element |
| Object element = elements[0]; |
| IDebugCommandHandler handler = getHandler(element, handlerType); |
| if (handler != null) { |
| ExecuteActionRequest request = new ExecuteActionRequest(elements); |
| request.setCommandParticipant(participant); |
| return handler.execute(request); |
| } |
| } else { |
| Map map = collate(elements, handlerType); |
| if (map != null) { |
| boolean enabled = true; |
| Iterator entries = map.entrySet().iterator(); |
| while (entries.hasNext()) { |
| Entry entry = (Entry) entries.next(); |
| IDebugCommandHandler handler = (IDebugCommandHandler) entry.getKey(); |
| List list = (List) entry.getValue(); |
| ExecuteActionRequest request = new ExecuteActionRequest(list.toArray()); |
| request.setCommandParticipant(participant); |
| // specifically use & so handler is executed |
| enabled = enabled & handler.execute(request); |
| } |
| return enabled; |
| } |
| } |
| // ABORT - no command processors |
| return false; |
| } |
| |
| public void debugContextChanged(DebugContextEvent event) { |
| postUpdate(event.getContext()); |
| } |
| |
| /** |
| * Returns a map of command handlers to associated elements, or <code>null</code> if |
| * one is missing. |
| * |
| * @param elements |
| * @return map of command handlers to associated elements or <code>null</code> |
| */ |
| private Map collate(Object[] elements, Class handlerType) { |
| Map map = new HashMap(); |
| for (int i = 0; i < elements.length; i++) { |
| Object element = elements[i]; |
| IDebugCommandHandler handler = getHandler(element, handlerType); |
| if (handler == null) { |
| return null; |
| } else { |
| List list = (List) map.get(handler); |
| if (list == null) { |
| list = new ArrayList(); |
| map.put(handler, list); |
| } |
| list.add(element); |
| } |
| } |
| return map; |
| } |
| |
| private IDebugCommandHandler getHandler(Object element, Class handlerType) { |
| return (IDebugCommandHandler)DebugPlugin.getAdapter(element, handlerType); |
| } |
| |
| } |