/*
 *    GeoTools - OpenSource mapping toolkit
 *    http://geotools.org
 *    (C) 2005-2006, GeoTools Project Managment Committee (PMC)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library 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
 *    Lesser General Public License for more details.
 */
package org.geotools.event;


/**
 * Indicates a constant immutable data object, may be shared (and will
 * not issue change notifications).
 *
 * @author Jody Garnett, Refractions Research, Inc.
 *
 * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/api/src/main/java/org/geotools/event/GTConstant.java $
 */
public class GTConstant implements GTComponent {
    public static final GTRoot SHARED = GTRoot.NO_PARENT;

    public Object clone() {
        return this; // we are constant
    }

    public GTComponent getParent() {
        return getNote().getParent();
    }

    public void removed(GTDelta delta) {
        throw new IllegalStateException("A child has changed in an immutable Default!");
    }

    public void changed(GTDelta delta) {
        throw new IllegalStateException("A child has changed in an immutable Default!");
    }

    public GTNote getNote() {
        return GTNote.EMPTY;
    }

    public void setNote(GTNote container) {
        // TODO Auto-generated method stub		
    }
}
