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/*******************************************************************************
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* Copyright (c) 2000, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.draw2d;
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/**
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* The base class for accessible objects which provides accesibilty clients with
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* a unique ID.
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*/
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public class AccessibleBase {
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/**
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* Returns the id of this accessible object using {@link Object#hashCode()}.
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*
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* @return the id
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*/
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public final int getAccessibleID() {
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/*
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* This assumes that the native implementation of hashCode in Object is
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* to return the pointer to the Object, which should be U-unique.
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*/
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int value = super.hashCode();
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/*
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* Values -3, -2, and -1 are reserved by SWT's ACC class to have special
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* meaning. Therefore, a child cannot have this value.
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*/
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if (value < 0)
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value -= 4;
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return value;
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}
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}
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