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From t...@apache.org
Subject cvs commit: db-ojb/src/java/org/apache/ojb/broker/util/collections RemovalAwareList.java
Date Mon, 23 Feb 2004 15:14:35 GMT
thma        2004/02/23 07:14:35

  Added:       src/java/org/apache/ojb/broker/util/collections
                        RemovalAwareList.java
  Log:
  added Edsons Removal Aware ArrayList
  
  Revision  Changes    Path
  1.1                  db-ojb/src/java/org/apache/ojb/broker/util/collections/RemovalAwareList.java
  
  Index: RemovalAwareList.java
  ===================================================================
  package org.apache.ojb.broker.util.collections;
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache ObjectRelationalBridge" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache ObjectRelationalBridge", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  import org.apache.ojb.broker.PersistenceBroker;
  import org.apache.ojb.broker.PersistenceBrokerException;
  
  import java.util.Iterator;
  import java.util.Vector;
  
  /**
   * This is a list that tracks removal and addition of elements.
   * This tracking allow the PersistenceBroker to delete elements from
   * the database that have been removed from the collection before a
   * PB.store() orperation occurs.
   * This will allow to use the PB api in way pretty close to ODMG persistent
   * collections!
   * @author Thomas Mahler, adapted to ManageableArrayList by Edson C. E. Richter
   */
  public class RemovalAwareList extends ManageableArrayList
  {
      private Vector allObjectsToBeRemoved = new Vector();
  
      /**
       * @see org.apache.ojb.broker.ManageableCollection#afterStore(PersistenceBroker broker)
       */
      public void afterStore(PersistenceBroker broker) throws PersistenceBrokerException
      {
          // make sure allObjectsToBeRemoved does not contain
          // any instances that got re-added to the list
          allObjectsToBeRemoved.removeAll(this);
  
          Iterator iter = allObjectsToBeRemoved.iterator();
          while (iter.hasNext())
          {
              broker.delete(iter.next());
          }
          allObjectsToBeRemoved.clear();
      }
  
      /**
       * @see java.util.List#remove(int)
       */
      public Object remove(int index)
      {
          Object toBeRemoved = super.remove(index);
          registerForDeletion(toBeRemoved);
          return toBeRemoved;
      }
  
      protected void registerForDeletion(Object toBeRemoved)
      {
          //only add objects once to avoid double deletions
          if (!allObjectsToBeRemoved.contains(toBeRemoved))
          {
              this.allObjectsToBeRemoved.add(toBeRemoved);
          }
      }
  
      /**
       * @see java.util.Collection#remove(Object)
       */
      public boolean remove(Object o)
      {
          boolean result = super.remove(o);
          registerForDeletion(o);
          return result;
      }
  
      /**
       * @see java.util.Vector#removeAllElements()
       */
      public synchronized void removeAllElements()
      {
          for (int i = 0; i < this.size(); i++)
          {
              registerForDeletion(this.get(i));
          }
          super.clear();
      }
  
  
      /**
       * @see java.util.Vector#removeElementAt(int)
       */
      public synchronized void removeElementAt(int index)
      {
          Object toBeDeleted = this.get(index);
          registerForDeletion(toBeDeleted);
          super.remove(index);
      }
  
      public synchronized void clear() {
        removeAllElements();
      }
      
      /**
       * @see java.util.AbstractList#removeRange(int, int)
       */
      protected void removeRange(int fromIndex, int toIndex)
      {
          for (int i = fromIndex; i < toIndex; i++)
          {
              registerForDeletion(this.get(i));
          }
          super.removeRange(fromIndex, toIndex);
      }
  
      public void resetDeleted() {
        this.allObjectsToBeRemoved.clear();
      }
      
  }
  
  

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