/******************************************************************************* | |
* 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 add a model object to a list in a target model object. | |
* | |
* (For example, AddPropertyCommand is used to add a Property to the list of properties | |
* in a CorrelationSet). | |
*/ | |
public abstract class AddToListCommand extends AutoUndoCommand { | |
protected EObject target; | |
protected Object newElement; | |
public AddToListCommand(EObject target, Object newElement, String cmdLabel) { | |
super(cmdLabel, target); | |
this.target = target; | |
this.newElement = newElement; | |
} | |
public AddToListCommand(EObject target, String cmdLabel) { | |
super(cmdLabel, target); | |
this.target = target; | |
} | |
/** | |
* Called before adding to the list, if getList() returns null or if it returns an empty list. | |
*/ | |
protected void createList() { } | |
/** | |
* Called when undoing the add results in an empty list. | |
*/ | |
protected void deleteList() { } | |
/** | |
* Subclasses should override this to return the intended list from target. | |
*/ | |
protected abstract List getList(); | |
@Override | |
public void doExecute() { | |
if (newElement == null) throw new IllegalStateException(); | |
List list = getList(); | |
if (list == null || list.isEmpty()) { | |
createList(); | |
list = getList(); | |
} | |
list.add(newElement); | |
} | |
public Object getNewElement() { return newElement; } | |
public void setNewElement(Object object) { newElement = object; } | |
} |