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
21 import org.apache.commons.functor.Predicate;
22 import org.apache.commons.functor.Procedure;
23
24 /**
25 * Base class for predicated procedure algorithms.
26 *
27 * @version $Revision: 1156320 $ $Date: 2011-08-10 21:14:50 +0200 (Wed, 10 Aug 2011) $
28 */
29 abstract class PredicatedLoop implements Procedure, Serializable {
30 /**
31 * serialVersionUID declaration.
32 */
33 private static final long serialVersionUID = 3221684231735316893L;
34 private final Procedure body;
35 private final Predicate test;
36
37 /**
38 * Create a new PredicatedLoop.
39 * @param body to execute
40 * @param test whether to keep going
41 */
42 protected PredicatedLoop(Procedure body, Predicate test) {
43 this.body = body;
44 this.test = test;
45 }
46
47 /**
48 * Get the body of this loop.
49 * @return Procedure
50 */
51 protected Procedure getBody() {
52 return body;
53 }
54
55 /**
56 * Get the test for this loop.
57 * @return Predicate
58 */
59 protected Predicate getTest() {
60 return test;
61 }
62
63 /**
64 * {@inheritDoc}
65 */
66 public boolean equals(Object obj) {
67 if (obj == this) {
68 return true;
69 }
70 if (obj == null || !obj.getClass().equals(getClass())) {
71 return false;
72 }
73 PredicatedLoop other = (PredicatedLoop) obj;
74 return other.body.equals(body) && other.test.equals(test);
75 }
76
77 /**
78 * {@inheritDoc}
79 */
80 public int hashCode() {
81 String classname = getClass().getName();
82 int dot = classname.lastIndexOf('.');
83 int result = classname.substring(dot + 1).hashCode();
84 result <<= 2;
85 result ^= body.hashCode();
86 result <<= 2;
87 result ^= test.hashCode();
88 return result;
89 }
90 }