Package net.sf.jasperreports.engine.base

Source Code of net.sf.jasperreports.engine.base.JRBasePropertyExpression

/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2009 Jaspersoft Corporation. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports 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 3 of the License, or
* (at your option) any later version.
*
* JasperReports 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 JasperReports. If not, see <http://www.gnu.org/licenses/>.
*/
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 3033 2009-08-27 11:46:22Z teodord $
*/
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 name;
  }

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

  public JRExpression getValueExpression()
  {
    return 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 (eventSupport == null)
      {
        eventSupport = new JRPropertyChangeSupport(this);
      }
    }
   
    return eventSupport;
  }

}
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