Ptidej-v5.2-master/Ptidej Reporting Tests/src/net/sf/jasperreports/engine/base/JRBasePropertyExpression.java
/*
 * ============================================================================
 * GNU Lesser General Public License
 * ============================================================================
 *
 * JasperReports - Free Java report-generating library.
 * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
 * 
 * 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; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * 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.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
 * 
 * JasperSoft Corporation
 * 303 Second Street, Suite 450 North
 * San Francisco, CA 94107
 * http://www.jaspersoft.com
 */
package net.sf.jasperreports.engine.base;

import java.io.Serializable;

import net.sf.jasperreports.engine.JRConstants;
import net.sf.jasperreports.engine.JRExpression;
import net.sf.jasperreports.engine.JRPropertyExpression;
import net.sf.jasperreports.engine.design.events.JRChangeEventsSupport;
import net.sf.jasperreports.engine.design.events.JRPropertyChangeSupport;

/**
 * Base implementation of {@link JRPropertyExpression}.
 * 
 * @author Lucian Chirita (lucianc@users.sourceforge.net)
 * @version $Id: JRBasePropertyExpression.java,v 1.1 2008/09/29 16:21:16 guehene Exp $
 */
public class JRBasePropertyExpression implements JRPropertyExpression, Serializable, JRChangeEventsSupport
{
	
	private static final long serialVersionUID = JRConstants.SERIAL_VERSION_UID;
	
	public static final String PROPERTY_NAME = "name";
	public static final String pROPERTY_VALUE_EXPRESSION = "valueExpression";

	private String name;
	private JRExpression valueExpression;

	protected JRBasePropertyExpression()
	{
		//empty
	}
	
	public JRBasePropertyExpression(JRPropertyExpression propertyExpression,
			JRBaseObjectFactory factory)
	{
		this.name = propertyExpression.getName();
		this.valueExpression = factory.getExpression(propertyExpression.getValueExpression());
	}

	public String getName()
	{
		return this.name;
	}

	public void setName(String name)
	{
		Object old = this.name;
		this.name = name;
		getEventSupport().firePropertyChange(PROPERTY_NAME, old, this.name);
	}

	public JRExpression getValueExpression()
	{
		return this.valueExpression;
	}

	protected void setValueExpression(JRExpression valueExpression)
	{
		Object old = this.valueExpression;
		this.valueExpression = valueExpression;
		getEventSupport().firePropertyChange(pROPERTY_VALUE_EXPRESSION, old, this.valueExpression);
	}
	
	private transient JRPropertyChangeSupport eventSupport;
	
	public JRPropertyChangeSupport getEventSupport()
	{
		synchronized (this)
		{
			if (this.eventSupport == null)
			{
				this.eventSupport = new JRPropertyChangeSupport(this);
			}
		}
		
		return this.eventSupport;
	}

}
