/******************************************************************************* | |
* 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 2.0 | |
* which accompanies this distribution, and is available at | |
* https://www.eclipse.org/legal/epl-2.0/ | |
* | |
* SPDX-License-Identifier: EPL-2.0 | |
* | |
* 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; } | |
} |