| /****************************************************************************** |
| * Copyright (c) 2006, 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.gmf.runtime.diagram.ui.commands; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.LinkedHashSet; |
| |
| import org.eclipse.core.commands.operations.IUndoableOperation; |
| import org.eclipse.gef.commands.Command; |
| import org.eclipse.gef.commands.CompoundCommand; |
| import org.eclipse.gmf.runtime.common.core.command.ICommand; |
| |
| /** |
| * Class containing commands utility methods. |
| * |
| * @author aboyko |
| * |
| */ |
| public class CommandUtilities { |
| |
| /** |
| * This utility function determines whether the command is redoable. |
| * Since GEF commands API doesn't support for canRedo method, this |
| * utility will help to travel through the contents of GEF wrapper |
| * commands and determine redoability of the GEF command based on |
| * the redoability of the commands it contains. |
| * |
| * @param command The command to be examined |
| * @return <code>true</code> if the passed command is redoable |
| */ |
| public static boolean canRedo(Command command) |
| { |
| if (command == null) |
| return false; |
| |
| if (command instanceof IUndoableOperation) |
| { |
| return ((IUndoableOperation) command).canRedo(); |
| } |
| else if (command instanceof CompoundCommand) |
| { |
| for ( Iterator iter = ((CompoundCommand)command).getCommands().iterator(); iter.hasNext(); ) |
| { |
| try |
| { |
| if (!canRedo((Command)iter.next())) |
| return false; |
| } |
| catch (ClassCastException e) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| else if (command instanceof ICommandProxy) |
| { |
| return ((ICommandProxy)command).getICommand().canRedo(); |
| } |
| return command.canUndo(); |
| } |
| |
| /** |
| * Determines the files affected by <code>command</code>. Since GEF |
| * command API has no support for #getAffectedFiles, this utility will |
| * traverse the contents of GEF wrapper commands and determine the files |
| * affected by the <code>ICommands</code> it contains. |
| * |
| * @param command |
| * the command |
| * @return the affected files |
| */ |
| public static Collection getAffectedFiles(Command command) |
| { |
| if (command == null) |
| return Collections.EMPTY_LIST; |
| |
| if (command instanceof ICommand) { |
| return ((ICommand) command).getAffectedFiles(); |
| |
| } else if (command instanceof ICommandProxy) { |
| return ((ICommandProxy)command).getICommand().getAffectedFiles(); |
| |
| } else if (command instanceof CompoundCommand) { |
| LinkedHashSet result = new LinkedHashSet(); |
| |
| for (Iterator iter = ((CompoundCommand)command).getCommands().iterator(); iter.hasNext();) { |
| result.addAll(getAffectedFiles((Command) iter.next())); |
| } |
| return result; |
| } |
| return Collections.EMPTY_LIST; |
| } |
| |
| } |