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.ListIterator;
21
22 import org.apache.commons.functor.BinaryProcedure;
23 import org.apache.commons.functor.UnaryFunction;
24
25 /**
26 * Implements an in-place transformation of a ListIterator's contents.
27 *
28 * @version $Revision: 1156337 $ $Date: 2011-08-10 21:44:54 +0200 (Wed, 10 Aug 2011) $
29 */
30 public final class InPlaceTransform<T>
31 implements BinaryProcedure<ListIterator<T>, UnaryFunction<? super T, ? extends T>>, Serializable {
32 /**
33 * serialVersionUID declaration.
34 */
35 private static final long serialVersionUID = 4365206078517376006L;
36 private static final InPlaceTransform<Object> INSTANCE = new InPlaceTransform<Object>();
37
38 /**
39 * {@inheritDoc}
40 * @param left {@link ListIterator}
41 * @param right {@link UnaryFunction}
42 */
43 public void run(ListIterator<T> left, UnaryFunction<? super T, ? extends T> right) {
44 while (left.hasNext()) {
45 left.set(right.evaluate(left.next()));
46 }
47 }
48
49 /**
50 * {@inheritDoc}
51 */
52 public boolean equals(Object obj) {
53 return obj == this || obj != null && obj.getClass().equals(getClass());
54 }
55
56 /**
57 * {@inheritDoc}
58 */
59 public int hashCode() {
60 return System.identityHashCode(INSTANCE);
61 }
62
63 /**
64 * Get an {@link InPlaceTransform} instance.
65 * @return InPlaceTransform
66 */
67 public static InPlaceTransform<Object> instance() {
68 return INSTANCE;
69 }
70
71 }