Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
TransformedFunction |
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| 1.5;1.5 | ||||
TransformedFunction$1 |
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| 1.5;1.5 | ||||
TransformedFunction$Helper |
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| 1.5;1.5 |
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.Function; | |
22 | import org.apache.commons.functor.UnaryFunction; | |
23 | ||
24 | /** | |
25 | * A Function whose result is then run through a UnaryFunction. | |
26 | * @version $Revision: 1171154 $ $Date: 2011-09-15 17:58:38 +0200 (Thu, 15 Sep 2011) $ | |
27 | * @author Matt Benson | |
28 | */ | |
29 | public class TransformedFunction<T> implements Function<T>, Serializable { | |
30 | /** | |
31 | * serialVersionUID declaration. | |
32 | */ | |
33 | private static final long serialVersionUID = 1201423110871342081L; | |
34 | ||
35 | /** | |
36 | * Type-remembering helper | |
37 | * @param <X> | |
38 | */ | |
39 | 0 | private static final class Helper<X, T> implements Function<T>, Serializable { |
40 | /** | |
41 | * serialVersionUID declaration. | |
42 | */ | |
43 | private static final long serialVersionUID = -7177784125292465809L; | |
44 | private Function<? extends X> preceding; | |
45 | private UnaryFunction<? super X, ? extends T> following; | |
46 | ||
47 | /** | |
48 | * Create a new Helper. | |
49 | * @param preceding Function | |
50 | * @param following UnaryFunction | |
51 | */ | |
52 | 0 | private Helper(Function<? extends X> preceding, UnaryFunction<? super X, ? extends T> following) { |
53 | 0 | this.preceding = preceding; |
54 | 0 | this.following = following; |
55 | 0 | } |
56 | ||
57 | /** | |
58 | * {@inheritDoc} | |
59 | */ | |
60 | public T evaluate() { | |
61 | 0 | return following.evaluate(preceding.evaluate()); |
62 | } | |
63 | } | |
64 | ||
65 | private final Helper<?, T> helper; | |
66 | ||
67 | /** | |
68 | * Create a new TransformedFunction. | |
69 | * @param <X> | |
70 | * @param preceding Function | |
71 | * @param following UnaryFunction | |
72 | */ | |
73 | public <X> TransformedFunction(Function<? extends X> preceding, | |
74 | 0 | UnaryFunction<? super X, ? extends T> following) { |
75 | 0 | this.helper = new Helper<X, T>(preceding, following); |
76 | 0 | } |
77 | ||
78 | /** | |
79 | * {@inheritDoc} | |
80 | */ | |
81 | public final T evaluate() { | |
82 | 0 | return helper.evaluate(); |
83 | } | |
84 | ||
85 | /** | |
86 | * {@inheritDoc} | |
87 | */ | |
88 | @Override | |
89 | public final boolean equals(Object obj) { | |
90 | 0 | return obj == this || obj instanceof TransformedFunction<?> && equals((TransformedFunction<?>) obj); |
91 | } | |
92 | ||
93 | /** | |
94 | * Learn whether another TransformedFunction is equal to <code>this</code>. | |
95 | * @param that instance to test | |
96 | * @return whether equal | |
97 | */ | |
98 | public final boolean equals(TransformedFunction<?> that) { | |
99 | 0 | return that != null && that.helper.preceding.equals(this.helper.preceding) |
100 | && that.helper.following.equals(this.helper.following); | |
101 | } | |
102 | ||
103 | /** | |
104 | * {@inheritDoc} | |
105 | */ | |
106 | @Override | |
107 | public int hashCode() { | |
108 | 0 | int result = "TransformedFunction".hashCode(); |
109 | 0 | result <<= 2; |
110 | 0 | result |= helper.following.hashCode(); |
111 | 0 | result <<= 2; |
112 | 0 | result |= helper.preceding.hashCode(); |
113 | 0 | return result; |
114 | } | |
115 | ||
116 | /** | |
117 | * {@inheritDoc} | |
118 | */ | |
119 | @Override | |
120 | public String toString() { | |
121 | 0 | return "TransformedFunction<" + helper.preceding + "; " + helper.following + ">"; |
122 | } | |
123 | } |