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.functor.core.algorithm; 018 019 import java.io.Serializable; 020 import java.util.ListIterator; 021 022 import org.apache.commons.functor.BinaryProcedure; 023 import org.apache.commons.functor.UnaryFunction; 024 025 /** 026 * Implements an in-place transformation of a ListIterator's contents. 027 * 028 * @version $Revision: 1156337 $ $Date: 2011-08-10 21:44:54 +0200 (Wed, 10 Aug 2011) $ 029 */ 030 public final class InPlaceTransform<T> 031 implements BinaryProcedure<ListIterator<T>, UnaryFunction<? super T, ? extends T>>, Serializable { 032 /** 033 * serialVersionUID declaration. 034 */ 035 private static final long serialVersionUID = 4365206078517376006L; 036 private static final InPlaceTransform<Object> INSTANCE = new InPlaceTransform<Object>(); 037 038 /** 039 * {@inheritDoc} 040 * @param left {@link ListIterator} 041 * @param right {@link UnaryFunction} 042 */ 043 public void run(ListIterator<T> left, UnaryFunction<? super T, ? extends T> right) { 044 while (left.hasNext()) { 045 left.set(right.evaluate(left.next())); 046 } 047 } 048 049 /** 050 * {@inheritDoc} 051 */ 052 public boolean equals(Object obj) { 053 return obj == this || obj != null && obj.getClass().equals(getClass()); 054 } 055 056 /** 057 * {@inheritDoc} 058 */ 059 public int hashCode() { 060 return System.identityHashCode(INSTANCE); 061 } 062 063 /** 064 * Get an {@link InPlaceTransform} instance. 065 * @return InPlaceTransform 066 */ 067 public static InPlaceTransform<Object> instance() { 068 return INSTANCE; 069 } 070 071 }