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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.rapiddweller.common.bean;

import com.rapiddweller.common.NullSafeComparator;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.IOException;
import java.io.ObjectInputStream;

/**
 * Default implementation for {@link ObservableBean}.
 * Created at 17.07.2008 14:47:55
 *
 * @author Volker Bergmann
 * @since 0.4.5
 */
public class AbstractObservableBean implements ObservableBean {

  private static final long serialVersionUID = 8228948623675990966L;

  /**
   * The Property change support.
   */
  protected transient PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);

  @Override
  public void addPropertyChangeListener(PropertyChangeListener listener) {
    propertyChangeSupport.addPropertyChangeListener(listener);
  }

  @Override
  public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {
    propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
  }

  @Override
  public void removePropertyChangeListener(PropertyChangeListener listener) {
    propertyChangeSupport.removePropertyChangeListener(listener);
  }

  @Override
  public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) {
    propertyChangeSupport.removePropertyChangeListener(propertyName, listener);
  }

  /**
   * Fire property change.
   *
   * @param source       the source
   * @param propertyName the property name
   * @param oldValue     the old value
   * @param newValue     the new value
   */
  protected void firePropertyChange(Object source, String propertyName, Object oldValue, Object newValue) {
    if (!NullSafeComparator.equals(oldValue, newValue)) {
      PropertyChangeEvent event = new PropertyChangeEvent(source, propertyName, oldValue, newValue);
      propertyChangeSupport.firePropertyChange(event);
    }
  }

  private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
    in.defaultReadObject();
    this.propertyChangeSupport = new PropertyChangeSupport(this);
  }

}