1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.collections4.iterators; 18 19 import java.util.Iterator; 20 21 import org.apache.commons.collections4.functors.UniquePredicate; 22 23 /** 24 * A FilterIterator which only returns "unique" Objects. Internally, 25 * the Iterator maintains a Set of objects it has already encountered, 26 * and duplicate Objects are skipped. 27 * 28 * @param <E> the type of elements returned by this iterator. 29 * @since 2.1 30 */ 31 public class UniqueFilterIterator<E> extends FilterIterator<E> { 32 33 /** 34 * Constructs a new {@code UniqueFilterIterator}. 35 * 36 * @param iterator the iterator to use 37 */ 38 public UniqueFilterIterator(final Iterator<? extends E> iterator) { 39 super(iterator, UniquePredicate.uniquePredicate()); 40 } 41 42 }