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.functor.core.algorithm; 018 019import java.util.ListIterator; 020 021import org.apache.commons.functor.BinaryProcedure; 022import org.apache.commons.functor.Function; 023 024/** 025 * Implements an in-place transformation of a ListIterator's contents. 026 * 027 * @param <T> the arguments type 028 * @version $Revision: 1537906 $ $Date: 2013-11-01 12:47:33 +0100 (Fr, 01 Nov 2013) $ 029 */ 030public final class InPlaceTransform<T> 031 implements BinaryProcedure<ListIterator<T>, Function<? super T, ? extends T>> { 032 /** 033 * A static {@code InPlaceTransform} instance reference. 034 */ 035 private static final InPlaceTransform<Object> INSTANCE = new InPlaceTransform<Object>(); 036 037 /** 038 * {@inheritDoc} 039 * @param left {@link ListIterator} 040 * @param right {@link Function} 041 */ 042 public void run(ListIterator<T> left, Function<? super T, ? extends T> right) { 043 while (left.hasNext()) { 044 left.set(right.evaluate(left.next())); 045 } 046 } 047 048 /** 049 * {@inheritDoc} 050 */ 051 @Override 052 public boolean equals(Object obj) { 053 return obj == this || obj != null && obj.getClass().equals(getClass()); 054 } 055 056 /** 057 * {@inheritDoc} 058 */ 059 @Override 060 public int hashCode() { 061 return System.identityHashCode(INSTANCE); 062 } 063 064 /** 065 * {@inheritDoc} 066 */ 067 @Override 068 public String toString() { 069 return "InPlaceTransform"; 070 } 071 072 /** 073 * Get an {@link InPlaceTransform} instance. 074 * @return InPlaceTransform 075 */ 076 public static InPlaceTransform<Object> instance() { 077 return INSTANCE; 078 } 079 080}