org.polymap.model2.runtime.event.PropertyChangeSupport.java Source code

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Here is the source code for org.polymap.model2.runtime.event.PropertyChangeSupport.java

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/* 
 * polymap.org
 * Copyright (C) 2012-2014, Falko Brutigam. All rights reserved.
 *
 * This 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; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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.polymap.model2.runtime.event;

import java.beans.PropertyChangeEvent;

import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;

import org.polymap.core.runtime.event.EventManager;

import org.polymap.model2.Entity;
import org.polymap.model2.ManyAssociation;
import org.polymap.model2.Property;
import org.polymap.model2.PropertyConcern;
import org.polymap.model2.PropertyConcernBase;
import org.polymap.model2.runtime.PropertyInfo;
import org.polymap.model2.runtime.ValueInitializer;

/**
 * Fires {@link PropertyChangeEvent}s via {@link EventManager} when a
 * {@link Property} changes.
 * 
 * @author <a href="http://www.polymap.de">Falko Brutigam</a>
 */
public class PropertyChangeSupport extends PropertyConcernBase implements PropertyConcern, ManyAssociation {

    private static final Log log = LogFactory.getLog(PropertyChangeSupport.class);

    @Override
    public Object get() {
        return ((Property) delegate).get();
    }

    @Override
    public Object createValue(ValueInitializer initializer) {
        return ((Property) delegate).createValue(initializer);
    }

    @Override
    public void set(Object value) {
        ((Property) delegate).set(value);
        fireEvent(null, value);
    }

    @Override
    public boolean add(Object e) {
        boolean result = ((ManyAssociation) delegate).add(e);
        fireEvent(null, e);
        return result;
    }

    protected void fireEvent(Object oldValue, Object newValue) {
        PropertyInfo info = delegate.info();
        Entity entity = context.getCompositePart(Entity.class);
        PropertyChangeEvent event = new PropertyChangeEvent(entity, info.getName(), oldValue, newValue);
        EventManager.instance().publish(event);
    }

}