Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
ConditionalBinaryPredicate |
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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.composite; | |
18 | ||
19 | import java.io.Serializable; | |
20 | ||
21 | import org.apache.commons.functor.BinaryPredicate; | |
22 | ||
23 | /** | |
24 | * A {@link BinaryPredicate BinaryPredicate} | |
25 | * similiar to Java's "ternary" | |
26 | * or "conditional" operator (<code>? :</code>). | |
27 | * Given three {@link BinaryPredicate predicates} | |
28 | * <i>p</i>, <i>q</i>, <i>r</i>, | |
29 | * {@link #test tests} | |
30 | * to | |
31 | * <code>p.test(x,y) ? q.test(x,y) : r.test(x,y)</code>. | |
32 | * <p> | |
33 | * Note that although this class implements | |
34 | * {@link Serializable}, a given instance will | |
35 | * only be truly <code>Serializable</code> if all the | |
36 | * underlying functors are. Attempts to serialize | |
37 | * an instance whose delegates are not all | |
38 | * <code>Serializable</code> will result in an exception. | |
39 | * </p> | |
40 | * @version $Revision: 1166383 $ $Date: 2011-09-07 22:21:04 +0200 (Wed, 07 Sep 2011) $ | |
41 | * @author Rodney Waldhoff | |
42 | */ | |
43 | public final class ConditionalBinaryPredicate<L, R> implements BinaryPredicate<L, R>, Serializable { | |
44 | /** | |
45 | * serialVersionUID declaration. | |
46 | */ | |
47 | private static final long serialVersionUID = -4511946801764080748L; | |
48 | ||
49 | /** Base hash integer used to shift hash */ | |
50 | private static final int HASH_SHIFT = 4; | |
51 | // attributes | |
52 | // ------------------------------------------------------------------------ | |
53 | private final BinaryPredicate<? super L, ? super R> ifPred; | |
54 | private final BinaryPredicate<? super L, ? super R> thenPred; | |
55 | private final BinaryPredicate<? super L, ? super R> elsePred; | |
56 | ||
57 | // constructor | |
58 | // ------------------------------------------------------------------------ | |
59 | /** | |
60 | * Create a new ConditionalBinaryPredicate. | |
61 | * @param ifPred if | |
62 | * @param thenPred then | |
63 | * @param elsePred else | |
64 | */ | |
65 | public ConditionalBinaryPredicate(BinaryPredicate<? super L, ? super R> ifPred, | |
66 | 22 | BinaryPredicate<? super L, ? super R> thenPred, BinaryPredicate<? super L, ? super R> elsePred) { |
67 | 22 | if (ifPred == null || thenPred == null || elsePred == null) { |
68 | 0 | throw new IllegalArgumentException("One or more BinaryPredicate arguments was null"); |
69 | } | |
70 | 22 | this.ifPred = ifPred; |
71 | 22 | this.thenPred = thenPred; |
72 | 22 | this.elsePred = elsePred; |
73 | 22 | } |
74 | ||
75 | // predicate interface | |
76 | // ------------------------------------------------------------------------ | |
77 | /** | |
78 | * {@inheritDoc} | |
79 | */ | |
80 | public boolean test(L left, R right) { | |
81 | 4 | return ifPred.test(left, right) ? thenPred.test(left, right) : elsePred.test(left, right); |
82 | } | |
83 | ||
84 | /** | |
85 | * {@inheritDoc} | |
86 | */ | |
87 | public boolean equals(Object that) { | |
88 | 24 | return that == this || (that instanceof ConditionalBinaryPredicate<?, ?> |
89 | && equals((ConditionalBinaryPredicate<?, ?>) that)); | |
90 | } | |
91 | ||
92 | /** | |
93 | * Learn whether another ConditionalBinaryPredicate is equal to this. | |
94 | * @param that ConditionalBinaryPredicate to test | |
95 | * @return boolean | |
96 | */ | |
97 | public boolean equals(ConditionalBinaryPredicate<?, ?> that) { | |
98 | 18 | return null != that |
99 | && (null == ifPred ? null == that.ifPred : ifPred.equals(that.ifPred)) | |
100 | && (null == thenPred ? null == that.thenPred : thenPred.equals(that.thenPred)) | |
101 | && (null == elsePred ? null == that.elsePred : elsePred.equals(that.elsePred)); | |
102 | } | |
103 | ||
104 | /** | |
105 | * {@inheritDoc} | |
106 | */ | |
107 | public int hashCode() { | |
108 | 26 | int hash = "ConditionalBinaryPredicate".hashCode(); |
109 | 26 | if (null != ifPred) { |
110 | 26 | hash <<= HASH_SHIFT; |
111 | 26 | hash ^= ifPred.hashCode(); |
112 | } | |
113 | 26 | if (null != thenPred) { |
114 | 26 | hash <<= HASH_SHIFT; |
115 | 26 | hash ^= thenPred.hashCode(); |
116 | } | |
117 | 26 | if (null != elsePred) { |
118 | 26 | hash <<= HASH_SHIFT; |
119 | 26 | hash ^= elsePred.hashCode(); |
120 | } | |
121 | 26 | return hash; |
122 | } | |
123 | ||
124 | /** | |
125 | * {@inheritDoc} | |
126 | */ | |
127 | public String toString() { | |
128 | 18 | return "ConditionalBinaryPredicate<" + ifPred + "?" + thenPred + ":" + elsePred + ">"; |
129 | } | |
130 | ||
131 | } |