001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    package org.apache.commons.collections.iterators;
018    
019    import java.util.Iterator;
020    
021    import org.apache.commons.collections.functors.UniquePredicate;
022    
023    /** 
024     * A FilterIterator which only returns "unique" Objects.  Internally,
025     * the Iterator maintains a Set of objects it has already encountered,
026     * and duplicate Objects are skipped.
027     *
028     * @since Commons Collections 2.1
029     * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
030     * 
031     * @author Morgan Delagrange
032     */
033    public class UniqueFilterIterator extends FilterIterator {
034           
035        //-------------------------------------------------------------------------
036        
037        /**
038         *  Constructs a new <code>UniqueFilterIterator</code>.
039         *
040         *  @param iterator  the iterator to use
041         */
042        public UniqueFilterIterator( Iterator iterator ) {
043            super(iterator, UniquePredicate.getInstance());
044        }
045    
046    }