/*
    *  File: WatchableArrayList.java 
    *  Copyright (c) 2004-2007  Peter Kliem (Peter.Kliem@jaret.de)
    *  A commercial license is available, see http://www.jaret.de.
    *
    * All rights reserved. This program and the accompanying materials
    * are made available under the terms of the Common Public License v1.0
    * which accompanies this distribution, and is available at
    * http://www.eclipse.org/legal/cpl-v10.html
   */
  package de.jaret.util.collections;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  import java.util.ListIterator;
  
  /**
   * @author Peter Kliem
   * @version $id$
   */
  public class WatchableArrayList implements List {
      private List<ListWatcher> _listeners;
      private List _content;
  
      /**
       * 
       */
      public WatchableArrayList() {
          _content = new ArrayList();
      }
  
      public void addListWatcher(ListWatcher watcher) {
          if (_listeners == null) {
              _listeners = new ArrayList<ListWatcher>();
          }
          _listeners.add(watcher);
      }
  
      public void removeListWatcher(ListWatcher watcher) {
          if (_listeners != null) {
              _listeners.remove(watcher);
          }
      }
  
      private void fireElementAdded(Object o) {
          if (_listeners != null) {
              for (ListWatcher watcher : _listeners) {
                  watcher.elementAdded(o);
              }
          }
      }
  
      private void fireElementRemoved(Object o) {
          if (_listeners != null) {
              for (ListWatcher watcher : _listeners) {
                  watcher.elementRemoved(o);
              }
          }
      }
  
      /*
       * (non-Javadoc)
       * 
       * @see java.util.List#size()
       */
      public int size() {
          return _content.size();
      }
  
      /*
       * (non-Javadoc)
       * 
       * @see java.util.List#isEmpty()
       */
      public boolean isEmpty() {
          return _content.isEmpty();
      }
  
      /*
       * (non-Javadoc)
       * 
       * @see java.util.List#contains(java.lang.Object)
       */
      public boolean contains(Object o) {
          return _content.contains(o);
      }
  
      /*
       * (non-Javadoc)
       * 
       * @see java.util.List#iterator()
       */
      public Iterator iterator() {
          return _content.iterator();
      }
  
      /*
      * (non-Javadoc)
      * 
      * @see java.util.List#toArray()
      */
     public Object[] toArray() {
         return _content.toArray();
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#toArray(java.lang.Object[])
      */
     public Object[] toArray(Object[] a) {
         return _content.toArray(a);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#add(java.lang.Object)
      */
     public boolean add(Object o) {
         boolean result = _content.add(o);
         fireElementAdded(o);
         return result;
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#remove(java.lang.Object)
      */
     public boolean remove(Object o) {
         boolean wasInList = _content.contains(o);
         boolean result = _content.remove(o);
         if (wasInList) {
             fireElementRemoved(o);
         }
         return result;
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#containsAll(java.util.Collection)
      */
     public boolean containsAll(Collection c) {
         return _content.containsAll(c);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#addAll(java.util.Collection)
      */
     public boolean addAll(Collection c) {
         // TODO listener
         return _content.addAll(c);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#addAll(int, java.util.Collection)
      */
     public boolean addAll(int index, Collection c) {
         // TODO listener
         return _content.addAll(index, c);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#removeAll(java.util.Collection)
      */
     public boolean removeAll(Collection c) {
         // TODO listener
         return _content.removeAll(c);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#retainAll(java.util.Collection)
      */
     public boolean retainAll(Collection c) {
         // TODO listener
         return _content.retainAll(c);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#clear()
      */
     public void clear() {
         // TODO listener
         _content.clear();
 
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#get(int)
      */
     public Object get(int index) {
         return _content.get(index);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#set(int, java.lang.Object)
      */
     public Object set(int index, Object element) {
         // TODO listener
         return _content.set(index, element);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#add(int, java.lang.Object)
      */
     public void add(int index, Object element) {
         _content.add(index, element);
         fireElementAdded(element);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#remove(int)
      */
     public Object remove(int index) {
         Object o = _content.remove(index);
         fireElementRemoved(o);
         return o;
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#indexOf(java.lang.Object)
      */
     public int indexOf(Object o) {
         return _content.indexOf(o);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#lastIndexOf(java.lang.Object)
      */
     public int lastIndexOf(Object o) {
         return _content.lastIndexOf(o);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#listIterator()
      */
     public ListIterator listIterator() {
         return _content.listIterator();
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#listIterator(int)
      */
     public ListIterator listIterator(int index) {
         return _content.listIterator(index);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.util.List#subList(int, int)
      */
     public List subList(int fromIndex, int toIndex) {
         return _content.subList(fromIndex, toIndex);
     }
 
 }