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/*
 * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

package javax.media.j3d;

/**
 * During a cloneTree call an updated reference was requested
 * for a node that did not get cloned.  This happens when a sub-graph is
 * duplicated via cloneTree and has at least one Leaf node
 * that contains a reference to a Node that has no corresponding node in
 * the cloned sub-graph. This results in two Leaf nodes wanting to share
 * access to the same Node.
 * 
 * If dangling references are to be allowed during the cloneTree call,
 * cloneTree should be called with the
 * allowDanglingReferences parameter set to true.
 * @see Node#cloneTree
 */
public class DanglingReferenceException extends RuntimeException {

    /**
     * Create the exception object with default values.
     */
    public DanglingReferenceException() {
    }

    /**
     * Create the exception object that outputs message.
     * @param str the message string to be output.
     */
    public DanglingReferenceException(String str) {
	super(str);
    }

}