cvs commit: james-server/src/java/org/apache/james/util ListUtils.java

[mc...@apache.org]

mcconnell    2004/07/09 10:43:07

  Added:       src/java/org/apache/james/util ListUtils.java
  Log:
  Add ListUtils from excalibur-collections to the util package (this 3k source is the only usage of excalibur-collections).
  
  Revision  Changes    Path
  1.1                  james-server/src/java/org/apache/james/util/ListUtils.java
  
  Index: ListUtils.java
  ===================================================================
  /* 
   * Copyright 2002-2004 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.
   */
  package org.apache.james.util;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  /**
   * Miscelaneous utilities to manipulate Lists.
   *
   * @deprecated use org.apache.commons.collections.ListUtils instead
   * @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
   * @version CVS $Revision: 1.1 $ $Date: 2004/07/09 17:43:07 $
   * @since 4.0
   */
  public class ListUtils
  {
      public static List intersection( final List list1, final List list2 )
      {
          final ArrayList result = new ArrayList();
          final Iterator iterator = list2.iterator();
  
          while( iterator.hasNext() )
          {
              final Object o = iterator.next();
  
              if( list1.contains( o ) )
              {
                  result.add( o );
              }
          }
  
          return result;
      }
  
      public static List subtract( final List list1, final List list2 )
      {
          final ArrayList result = new ArrayList( list1 );
          final Iterator iterator = list2.iterator();
  
          while( iterator.hasNext() )
          {
              result.remove( iterator.next() );
          }
  
          return result;
      }
  
      public static List sum( final List list1, final List list2 )
      {
          return subtract( union( list1, list2 ),
                           intersection( list1, list2 ) );
      }
  
      public static List union( final List list1, final List list2 )
      {
          final ArrayList result = new ArrayList( list1 );
  
          final Iterator iterator = list2.iterator();
          while( iterator.hasNext() )
          {
              final Object o = iterator.next();
              if( !result.contains( o ) )
              {
                  result.add( o );
              }
          }
          return result;
      }
  }
  
  
  

---------------------------------------------------------------------
To unsubscribe, e-mail: server-dev-unsubscribe@james.apache.org
For additional commands, e-mail: server-dev-help@james.apache.org