Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
UnaryCompositeBinaryPredicate |
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| 2.25;2.25 | ||||
UnaryCompositeBinaryPredicate$Helper |
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| 2.25;2.25 |
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 | import org.apache.commons.functor.UnaryFunction; | |
23 | ||
24 | /** | |
25 | * A {@link BinaryPredicate BinaryPredicate} composed of | |
26 | * one binary predicate, <i>p</i>, and two unary | |
27 | * functions, <i>f</i> and <i>g</i>, | |
28 | * evaluating the ordered parameters <i>x</i>, <i>y</i> | |
29 | * to <code><i>p</i>(<i>f</i>(<i>x</i>),<i>g</i>(<i>y</i>))</code>. | |
30 | * <p> | |
31 | * Note that although this class implements | |
32 | * {@link Serializable}, a given instance will | |
33 | * only be truly <code>Serializable</code> if all the | |
34 | * underlying functors are. Attempts to serialize | |
35 | * an instance whose delegates are not all | |
36 | * <code>Serializable</code> will result in an exception. | |
37 | * </p> | |
38 | * @version $Revision: 1156337 $ $Date: 2011-08-10 21:44:54 +0200 (Wed, 10 Aug 2011) $ | |
39 | * @author Rodney Waldhoff | |
40 | */ | |
41 | public class UnaryCompositeBinaryPredicate<L, R> implements BinaryPredicate<L, R>, Serializable { | |
42 | /** | |
43 | * serialVersionUID declaration. | |
44 | */ | |
45 | private static final long serialVersionUID = 3841123079006929493L; | |
46 | ||
47 | 216 | private static class Helper<G, H, L, R> implements BinaryPredicate<L, R>, Serializable { |
48 | /** | |
49 | * serialVersionUID declaration. | |
50 | */ | |
51 | private static final long serialVersionUID = -3463108273324567825L; | |
52 | private BinaryPredicate<? super G, ? super H> f; | |
53 | private UnaryFunction<? super L, ? extends G> g; | |
54 | private UnaryFunction<? super R, ? extends H> h; | |
55 | ||
56 | /** | |
57 | * Create a new Helper. | |
58 | * @param f BinaryPredicate to test <i>output(</i><code>f</code><i>), output(</i><code>g</code><i>)</i> | |
59 | * @param g left UnaryFunction | |
60 | * @param h right UnaryFunction | |
61 | */ | |
62 | public Helper(BinaryPredicate<? super G, ? super H> f, UnaryFunction<? super L, ? extends G> g, | |
63 | 24 | UnaryFunction<? super R, ? extends H> h) { |
64 | 24 | this.f = f; |
65 | 24 | this.g = g; |
66 | 24 | this.h = h; |
67 | 24 | } |
68 | ||
69 | /** | |
70 | * {@inheritDoc} | |
71 | */ | |
72 | public boolean test(L left, R right) { | |
73 | 100 | return f.test(g.evaluate(left), h.evaluate(right)); |
74 | } | |
75 | } | |
76 | ||
77 | // attributes | |
78 | // ------------------------------------------------------------------------ | |
79 | private final Helper<?, ?, L, R> helper; | |
80 | ||
81 | // constructor | |
82 | // ------------------------------------------------------------------------ | |
83 | /** | |
84 | * Create a new UnaryCompositeBinaryPredicate. | |
85 | * @param f BinaryPredicate to test <i>output(</i><code>f</code><i>), output(</i><code>g</code><i>)</i> | |
86 | * @param g left UnaryFunction | |
87 | * @param h right UnaryFunction | |
88 | */ | |
89 | public <G, H> UnaryCompositeBinaryPredicate(final BinaryPredicate<? super G, ? super H> f, | |
90 | 24 | final UnaryFunction<? super L, ? extends G> g, final UnaryFunction<? super R, ? extends H> h) { |
91 | 24 | if (f == null) { |
92 | 0 | throw new IllegalArgumentException("BinaryPredicate must not be null"); |
93 | } | |
94 | 24 | if (g == null || h == null) { |
95 | 0 | throw new IllegalArgumentException("Left and right UnaryFunctions may not be null"); |
96 | } | |
97 | 24 | helper = new Helper<G, H, L, R>(f, g, h); |
98 | 24 | } |
99 | ||
100 | // function interface | |
101 | // ------------------------------------------------------------------------ | |
102 | /** | |
103 | * {@inheritDoc} | |
104 | */ | |
105 | public boolean test(L left, R right) { | |
106 | 100 | return helper.test(left, right); |
107 | } | |
108 | ||
109 | /** | |
110 | * {@inheritDoc} | |
111 | */ | |
112 | public boolean equals(Object that) { | |
113 | 24 | return that == this || (that instanceof UnaryCompositeBinaryPredicate<?, ?> |
114 | && equals((UnaryCompositeBinaryPredicate<?, ?>) that)); | |
115 | } | |
116 | ||
117 | /** | |
118 | * Learn whether another UnaryCompositeBinaryPredicate is equal to this. | |
119 | * @param that UnaryCompositeBinaryPredicate to test | |
120 | * @return boolean | |
121 | */ | |
122 | public boolean equals(UnaryCompositeBinaryPredicate<?, ?> that) { | |
123 | 18 | return null != that && helper.f.equals(that.helper.f) && helper.g.equals(that.helper.g) |
124 | && helper.h.equals(that.helper.h); | |
125 | } | |
126 | ||
127 | /** | |
128 | * {@inheritDoc} | |
129 | */ | |
130 | public int hashCode() { | |
131 | 26 | int hash = "UnaryCompositeBinaryPredicate".hashCode(); |
132 | 26 | hash <<= 4; |
133 | 26 | hash ^= helper.f.hashCode(); |
134 | 26 | hash <<= 4; |
135 | 26 | hash ^= helper.g.hashCode(); |
136 | 26 | hash <<= 4; |
137 | 26 | hash ^= helper.h.hashCode(); |
138 | 26 | return hash; |
139 | } | |
140 | ||
141 | /** | |
142 | * {@inheritDoc} | |
143 | */ | |
144 | public String toString() { | |
145 | 18 | return "UnaryCompositeBinaryPredicate<" + helper.f + ";" + helper.g + ";" + helper.h + ">"; |
146 | } | |
147 | ||
148 | } |