| /******************************************************************************* |
| * Copyright (c) 2005, 2012 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.bpel.ui.commands; |
| |
| import java.util.List; |
| |
| import org.eclipse.bpel.ui.commands.util.AutoUndoCommand; |
| import org.eclipse.emf.ecore.EObject; |
| |
| |
| /** |
| * Subclasses of this command remove a model object from a list in a target model object. |
| * |
| * (For example, RemovePropertyCommand is used to remove a Property from the list of properties |
| * in a CorrelationSet). |
| */ |
| public abstract class RemoveFromListCommand extends AutoUndoCommand { |
| |
| protected EObject target; |
| protected Object oldElement; |
| |
| protected int oldIndex; |
| |
| public RemoveFromListCommand(EObject target, String cmdLabel) { |
| super(cmdLabel, target); |
| this.target = target; |
| } |
| |
| public RemoveFromListCommand(EObject target, Object oldElement, String cmdLabel) { |
| super(cmdLabel, target); |
| this.target = target; |
| this.oldElement = oldElement; |
| } |
| |
| /** |
| * Subclasses should override this to return the intended list from target. |
| */ |
| protected abstract List getList(); |
| |
| /** |
| * Called before undoing a remove if getList() is empty or null. |
| */ |
| protected void createList() { } |
| |
| /** |
| * Called after removing an element from the list, if the list is now empty. |
| */ |
| protected void deleteList() { } |
| |
| |
| @Override |
| public boolean canDoExecute() { |
| if (oldElement == null) return false; |
| if (getList().indexOf(oldElement) < 0) return false; |
| |
| return true; // !getList().contains(newElement) |
| } |
| |
| @Override |
| public void doExecute() { |
| if (oldElement == null) throw new IllegalStateException(); |
| |
| List list = getList(); |
| oldIndex = list.indexOf(oldElement); |
| if (oldIndex >= 0) |
| list.remove(oldIndex); |
| if (list.isEmpty()) deleteList(); |
| } |
| |
| public Object getOldElement() { return oldElement; } |
| public void setOldElement(Object object) { oldElement = object; } |
| } |