1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.browsing.ui.common.internal;
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16 * An abstract reference to a single concrete graph explorer control item.
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18 * @author Tuukka Lehtonen
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20 public interface UIElementReference {
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23 * @return <code>true</code> if this TreeReference actually contains an
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24 * element behind it.
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26 public boolean hasReference();
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29 * @return <code>false</code> only if {@link #hasReference()} returns true
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30 * and the referenced control item not disposed. Note that
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31 * this method must return <code>true</code> if
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32 * {@link #hasReference()} returns <code>false</code>.
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34 public boolean isDisposed();
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