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.browsing.ui.common.internal;
16 * An abstract reference to a single concrete graph explorer control item.
18 * @author Tuukka Lehtonen
20 public interface UIElementReference {
23 * @return <code>true</code> if this TreeReference actually contains an
26 public boolean hasReference();
29 * @return <code>false</code> only if {@link #hasReference()} returns true
30 * and the referenced control item not disposed. Note that
31 * this method must return <code>true</code> if
32 * {@link #hasReference()} returns <code>false</code>.
34 public boolean isDisposed();