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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package javafx.beans.property;

import javafx.beans.InvalidationListener;
import javafx.beans.value.ChangeListener;

import com.sun.javafx.binding.ExpressionHelper;

/**
 * Base class for all readonly properties wrapping an arbitrary {@code Object}. This class provides a default
 * implementation to attach listener.
 *
 * @see ReadOnlyObjectProperty
 *
 * @param  the type of the wrapped {@code Object}
 * @since JavaFX 2.0
 */
public abstract class ReadOnlyObjectPropertyBase extends ReadOnlyObjectProperty {
    
    ExpressionHelper helper;

    @Override 
    public void addListener(InvalidationListener listener) {
        helper = ExpressionHelper.addListener(helper, this, listener);
    }

    @Override 
    public void removeListener(InvalidationListener listener) {
        helper = ExpressionHelper.removeListener(helper, listener);
    }
    
    @Override
    public void addListener(ChangeListener listener) {
        helper = ExpressionHelper.addListener(helper, this, listener);
    }

    @Override 
    public void removeListener(ChangeListener listener) {
        helper = ExpressionHelper.removeListener(helper, listener);
    }
    
    /**
     * Sends notifications to all attached
     * {@link javafx.beans.InvalidationListener InvalidationListeners} and
     * {@link javafx.beans.value.ChangeListener ChangeListeners}.
     * 
     * This method needs to be called, if the value of this property changes.
     */
    protected void fireValueChangedEvent() {
        ExpressionHelper.fireValueChangedEvent(helper);
    }
    
}