Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
ConditionalUnaryProcedure |
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| 3.4285714285714284;3.429 |
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.UnaryPredicate; | |
22 | import org.apache.commons.functor.UnaryProcedure; | |
23 | import org.apache.commons.functor.core.NoOp; | |
24 | ||
25 | /** | |
26 | * A {@link UnaryProcedure UnaryProcedure} | |
27 | * similiar to Java's "ternary" | |
28 | * or "conditional" operator (<code>? :</code>). | |
29 | * Given a {@link UnaryPredicate predicate} | |
30 | * <i>p</i> and {@link UnaryProcedure procedures} | |
31 | * <i>q</i> and <i>r</i>, {@link #run runs} | |
32 | * <code>if (p.test(x)) { q.run(x); } else { r.run(x); }</code>. | |
33 | * <p> | |
34 | * Note that although this class implements | |
35 | * {@link Serializable}, a given instance will | |
36 | * only be truly <code>Serializable</code> if all the | |
37 | * underlying functors are. Attempts to serialize | |
38 | * an instance whose delegates are not all | |
39 | * <code>Serializable</code> will result in an exception. | |
40 | * </p> | |
41 | * @version $Revision: 1170782 $ $Date: 2011-09-14 21:18:31 +0200 (Wed, 14 Sep 2011) $ | |
42 | * @author Rodney Waldhoff | |
43 | */ | |
44 | public final class ConditionalUnaryProcedure<A> implements UnaryProcedure<A>, Serializable { | |
45 | /** | |
46 | * serialVersionUID declaration. | |
47 | */ | |
48 | private static final long serialVersionUID = -895833369740247391L; | |
49 | ||
50 | /** Base hash integer used to shift hash */ | |
51 | private static final int HASH_SHIFT = 4; | |
52 | // attributes | |
53 | // ------------------------------------------------------------------------ | |
54 | private final UnaryPredicate<? super A> ifPred; | |
55 | private final UnaryProcedure<? super A> thenProc; | |
56 | private final UnaryProcedure<? super A> elseProc; | |
57 | ||
58 | // constructor | |
59 | // ------------------------------------------------------------------------ | |
60 | /** | |
61 | * Create a new ConditionalUnaryProcedure. | |
62 | * @param ifPred if | |
63 | * @param thenProc then | |
64 | */ | |
65 | public ConditionalUnaryProcedure(UnaryPredicate<? super A> ifPred, UnaryProcedure<? super A> thenProc) { | |
66 | 28 | this(ifPred, thenProc, NoOp.instance()); |
67 | 28 | } |
68 | ||
69 | /** | |
70 | * Create a new ConditionalUnaryProcedure. | |
71 | * @param ifPred if | |
72 | * @param thenProc then | |
73 | * @param elseProc else | |
74 | */ | |
75 | public ConditionalUnaryProcedure(UnaryPredicate<? super A> ifPred, | |
76 | UnaryProcedure<? super A> thenProc, | |
77 | 46 | UnaryProcedure<? super A> elseProc) { |
78 | 46 | if (ifPred == null) { |
79 | 0 | throw new IllegalArgumentException("UnaryPredicate argument was null"); |
80 | } | |
81 | 46 | this.ifPred = ifPred; |
82 | 46 | if (thenProc == null || elseProc == null) { |
83 | 0 | throw new IllegalArgumentException("One or more UnaryProcedure arguments was null"); |
84 | } | |
85 | 46 | this.thenProc = thenProc; |
86 | 46 | this.elseProc = elseProc; |
87 | 46 | } |
88 | ||
89 | // predicate interface | |
90 | // ------------------------------------------------------------------------ | |
91 | /** | |
92 | * {@inheritDoc} | |
93 | */ | |
94 | public void run(A obj) { | |
95 | 472 | if (ifPred.test(obj)) { |
96 | 236 | thenProc.run(obj); |
97 | } else { | |
98 | 236 | elseProc.run(obj); |
99 | } | |
100 | 472 | } |
101 | ||
102 | /** | |
103 | * {@inheritDoc} | |
104 | */ | |
105 | public boolean equals(Object that) { | |
106 | 20 | return that == this || (that instanceof ConditionalUnaryProcedure<?> |
107 | && equals((ConditionalUnaryProcedure<?>) that)); | |
108 | } | |
109 | ||
110 | /** | |
111 | * Learn whether another ConditionalUnaryProcedure is equal to this. | |
112 | * @param that ConditionalUnaryProcedure to test | |
113 | * @return boolean | |
114 | */ | |
115 | public boolean equals(ConditionalUnaryProcedure<?> that) { | |
116 | 14 | return null != that |
117 | && (null == ifPred ? null == that.ifPred : ifPred.equals(that.ifPred)) | |
118 | && (null == thenProc ? null == that.thenProc : thenProc.equals(that.thenProc)) | |
119 | && (null == elseProc ? null == that.elseProc : elseProc.equals(that.elseProc)); | |
120 | } | |
121 | ||
122 | /** | |
123 | * {@inheritDoc} | |
124 | */ | |
125 | public int hashCode() { | |
126 | 22 | int hash = "ConditionalUnaryProcedure".hashCode(); |
127 | 22 | if (null != ifPred) { |
128 | 22 | hash <<= HASH_SHIFT; |
129 | 22 | hash ^= ifPred.hashCode(); |
130 | } | |
131 | 22 | if (null != thenProc) { |
132 | 22 | hash <<= HASH_SHIFT; |
133 | 22 | hash ^= thenProc.hashCode(); |
134 | } | |
135 | 22 | if (null != elseProc) { |
136 | 22 | hash <<= HASH_SHIFT; |
137 | 22 | hash ^= elseProc.hashCode(); |
138 | } | |
139 | 22 | return hash; |
140 | } | |
141 | ||
142 | /** | |
143 | * {@inheritDoc} | |
144 | */ | |
145 | public String toString() { | |
146 | 14 | return "ConditionalUnaryProcedure<" + ifPred + "?" + thenProc + ":" + elseProc + ">"; |
147 | } | |
148 | ||
149 | } |