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.functor.core.algorithm; 18 19 import java.io.Serializable; 20 import java.util.Iterator; 21 22 import org.apache.commons.functor.BinaryProcedure; 23 import org.apache.commons.functor.UnaryPredicate; 24 25 /** 26 * Remove elements from left Iterator that match right UnaryPredicate. 27 * 28 * @version $Revision: 1166325 $ $Date: 2011-09-07 21:29:00 +0200 (Wed, 07 Sep 2011) $ 29 */ 30 public final class RemoveMatching<T> 31 implements BinaryProcedure<Iterator<? extends T>, UnaryPredicate<? super T>>, Serializable { 32 /** 33 * serialVersionUID declaration. 34 */ 35 private static final long serialVersionUID = -8376577687898040683L; 36 private static final RemoveMatching<Object> INSTANCE = new RemoveMatching<Object>(); 37 38 /** 39 * {@inheritDoc} 40 * @param left {@link Iterator} 41 * @param right {@link UnaryPredicate} 42 */ 43 public void run(Iterator<? extends T> left, UnaryPredicate<? super T> right) { 44 while (left.hasNext()) { 45 if (right.test(left.next())) { 46 left.remove(); 47 } 48 } 49 } 50 51 /** 52 * {@inheritDoc} 53 */ 54 public boolean equals(Object obj) { 55 return obj == this || obj != null && obj.getClass().equals(getClass()); 56 } 57 58 /** 59 * {@inheritDoc} 60 */ 61 public int hashCode() { 62 return System.identityHashCode(INSTANCE); 63 } 64 65 /** 66 * Get a static {@link RemoveMatching} instance. 67 * @return {@link RemoveMatching} 68 */ 69 public static RemoveMatching<Object> instance() { 70 return INSTANCE; 71 } 72 73 }