package org.apache.ojb.broker.util;

 /* Copyright 2004-2006 The Apache Software Foundation

  *

  * 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.

  */

 import java.util.ArrayList;

 import java.util.Iterator;

 import java.util.Collection;

 /**

  * Object identity based {@link java.util.List}, use <tt>"=="</tt> instead of

  * <tt>element_1.equals(element_2)</tt> to compare objects.

  *

  * @version $Id: IdentityArrayList.java,v 1.1 2007-08-24 22:17:36 ewestfal Exp $

  */

 public class IdentityArrayList extends ArrayList

 {

     public IdentityArrayList()

     {

     }

     public IdentityArrayList(int initialCapacity)

     {

         super(initialCapacity);

     }

     public IdentityArrayList(Collection c)

     {

         super(c);

     }

     public boolean contains(Object elem)

     {

         return indexOf(elem) >= 0;

     }

     public int indexOf(Object elem)

     {

         for(int i = 0; i < size(); i++)

             if(elem == get(i))

                 return i;

         return -1;

     }

     public int lastIndexOf(Object elem)

     {

         for(int i = size() - 1; i >= 0; i--)

             if(elem == get(i))

                 return i;

         return -1;

     }

     public boolean remove(Object o)

     {

         Iterator e = iterator();

         if(o == null)

         {

             while(e.hasNext())

             {

                 if(e.next() == null)

                 {

                     e.remove();

                     return true;

                 }

             }

         }

         else

         {

             while(e.hasNext())

             {

                 if(o == e.next())

                 {

                     e.remove();

                     return true;

                 }

             }

         }

         return false;

     }

 }