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 */ 017package org.apache.commons.collections4.iterators; 018 019import java.util.Iterator; 020 021import org.apache.commons.collections4.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 2.1 029 */ 030public class UniqueFilterIterator<E> extends FilterIterator<E> { 031 032 //------------------------------------------------------------------------- 033 034 /** 035 * Constructs a new <code>UniqueFilterIterator</code>. 036 * 037 * @param iterator the iterator to use 038 */ 039 public UniqueFilterIterator(final Iterator<? extends E> iterator) { 040 super(iterator, UniquePredicate.uniquePredicate()); 041 } 042 043}