1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.g2d.diagram.handler;
14 import org.simantics.g2d.diagram.IDiagram;
15 import org.simantics.g2d.element.IElement;
18 * Keeps a map between an element and its back-end object (KEY_OBJECT)
20 * @author Toni Kalajainen
22 public interface DataElementMap extends DiagramHandler {
25 * Get the element with given data (KEY_OBJECT)
27 * @param data the data object to find an element for
28 * @return element or null if no element has the data
30 * @throws NullPointerException if diagram or data is <code>null</code>
32 IElement getElement(IDiagram d, Object data);
35 * Get data related to an element
37 * @param element the element to get a back-end data object for
38 * @return data or null
40 * @throws NullPointerException if diagram or element is <code>null</code>
42 Object getData(IDiagram d, IElement element);