extract abstract bean superclass

[jSite2.git] / src / net / pterodactylus / util / beans / AbstractBean.java

diff --git a/src/net/pterodactylus/util/beans/AbstractBean.java b/src/net/pterodactylus/util/beans/AbstractBean.java
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+++ b/src/net/pterodactylus/util/beans/AbstractBean.java
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+/*
+ * jSite2 - AbstractBean.java
+ * Copyright © 2008 David Roden
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+package net.pterodactylus.util.beans;
+
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Abstract bean super class that contains property change listener management.
+ * 
+ * @author David ‘Bombe’ Roden <bombe@freenetproject.org>
+ * @version $Id$
+ */
+public class AbstractBean {
+
+       /** Property change listeners. */
+       private final List<PropertyChangeListener> propertyChangeListeners = Collections.synchronizedList(new ArrayList<PropertyChangeListener>());
+
+       /**
+        * Adds a property change listener.
+        * 
+        * @param propertyChangeListener
+        *            The property change listener to add
+        */
+       public void addPropertyChangeListener(PropertyChangeListener propertyChangeListener) {
+               propertyChangeListeners.add(propertyChangeListener);
+       }
+
+       /**
+        * Removes a property change listener.
+        * 
+        * @param propertyChangeListener
+        *            The property change listener to remove
+        */
+       public void removePropertyChangeListener(PropertyChangeListener propertyChangeListener) {
+               propertyChangeListeners.remove(propertyChangeListener);
+       }
+
+       /**
+        * Notifies all listeners that a property has changed.
+        * 
+        * @param property
+        *            The name of the property
+        * @param oldValue
+        *            The old value of the property
+        * @param newValue
+        *            The new value of the property
+        */
+       protected void firePropertyChange(String property, Object oldValue, Object newValue) {
+               PropertyChangeEvent propertyChangeEvent = new PropertyChangeEvent(this, property, oldValue, newValue);
+               for (PropertyChangeListener propertyChangeListener: propertyChangeListeners) {
+                       propertyChangeListener.propertyChange(propertyChangeEvent);
+               }
+
+       }
+
+}