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