Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
IsLessThan |
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| 1.8888888888888888;1.889 |
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.comparator; | |
18 | ||
19 | import java.io.Serializable; | |
20 | import java.util.Comparator; | |
21 | ||
22 | import org.apache.commons.functor.BinaryPredicate; | |
23 | import org.apache.commons.functor.UnaryPredicate; | |
24 | import org.apache.commons.functor.adapter.RightBoundPredicate; | |
25 | ||
26 | /** | |
27 | * A {@link BinaryPredicate BinaryPredicate} that {@link #test tests} | |
28 | * <code>true</code> iff the left argument is greater than the | |
29 | * right argument under the specified {@link Comparator}. | |
30 | * When no (or a <code>null</code> <code>Comparator</code> is specified, | |
31 | * a {@link Comparable Comparable} <code>Comparator</code> is used. | |
32 | * | |
33 | * @version $Revision: 1166345 $ $Date: 2011-09-07 21:47:15 +0200 (Wed, 07 Sep 2011) $ | |
34 | * @author Rodney Waldhoff | |
35 | */ | |
36 | public final class IsLessThan<T> implements BinaryPredicate<T, T>, Serializable { | |
37 | ||
38 | /** | |
39 | * Basic IsLessThan instance. | |
40 | */ | |
41 | 2 | public static final IsLessThan<Comparable<?>> INSTANCE = IsLessThan.<Comparable<?>>instance(); |
42 | ||
43 | /** | |
44 | * serialVersionUID declaration. | |
45 | */ | |
46 | private static final long serialVersionUID = 1809153179639613842L; | |
47 | ||
48 | private final Comparator<? super T> comparator; | |
49 | ||
50 | /** | |
51 | * Construct a <code>IsLessThan</code> {@link BinaryPredicate predicate} | |
52 | * for {@link Comparable Comparable}s. | |
53 | */ | |
54 | @SuppressWarnings("unchecked") | |
55 | public IsLessThan() { | |
56 | 30 | this(ComparableComparator.INSTANCE); |
57 | 30 | } |
58 | ||
59 | /** | |
60 | * Construct a <code>IsLessThan</code> {@link BinaryPredicate predicate} | |
61 | * for the given {@link Comparator Comparator}. | |
62 | * | |
63 | * @param comparator the {@link Comparator Comparator}, when <code>null</code>, | |
64 | * a <code>Comparator</code> for {@link Comparable Comparable}s will | |
65 | * be used. | |
66 | */ | |
67 | 32 | public IsLessThan(Comparator<? super T> comparator) { |
68 | 32 | if (comparator == null) { |
69 | 0 | throw new IllegalArgumentException("Comparator argument must not be null"); |
70 | } | |
71 | 32 | this.comparator = comparator; |
72 | 32 | } |
73 | ||
74 | /** | |
75 | * Return <code>true</code> iff the <i>left</i> parameter is | |
76 | * less than the <i>right</i> parameter under my current | |
77 | * {@link Comparator Comparator}. | |
78 | * {@inheritDoc} | |
79 | */ | |
80 | public boolean test(T left, T right) { | |
81 | 122 | return comparator.compare(left, right) < 0; |
82 | } | |
83 | ||
84 | /** | |
85 | * {@inheritDoc} | |
86 | */ | |
87 | public boolean equals(Object that) { | |
88 | 26 | return that == this || (that instanceof IsLessThan<?> && equals((IsLessThan<?>) that)); |
89 | } | |
90 | ||
91 | /** | |
92 | * Learn whether a given IsLessThan is equal to this. | |
93 | * @param that IsLessThan to test | |
94 | * @return boolean | |
95 | */ | |
96 | public boolean equals(IsLessThan<?> that) { | |
97 | 18 | if (null != that) { |
98 | 18 | if (null == comparator) { |
99 | 0 | return null == that.comparator; |
100 | } | |
101 | 18 | return comparator.equals(that.comparator); |
102 | } | |
103 | 0 | return false; |
104 | } | |
105 | ||
106 | /** | |
107 | * {@inheritDoc} | |
108 | */ | |
109 | public int hashCode() { | |
110 | 28 | int hash = "IsLessThan".hashCode(); |
111 | // by construction, comparator is never null | |
112 | 28 | hash ^= comparator.hashCode(); |
113 | 28 | return hash; |
114 | } | |
115 | ||
116 | /** | |
117 | * {@inheritDoc} | |
118 | */ | |
119 | public String toString() { | |
120 | 20 | return "IsLessThan<" + comparator + ">"; |
121 | } | |
122 | ||
123 | /** | |
124 | * Get a typed IsLessThan instance. | |
125 | * @param <T> | |
126 | * @return IsLessThan<T> | |
127 | */ | |
128 | public static <T extends Comparable<?>> IsLessThan<T> instance() { | |
129 | 8 | return new IsLessThan<T>(); |
130 | } | |
131 | ||
132 | /** | |
133 | * Get an IsLessThan UnaryPredicate. | |
134 | * @param right the right side object of the comparison. | |
135 | * @return UnaryPredicate | |
136 | */ | |
137 | public static <T extends Comparable<?>> UnaryPredicate<T> instance(T right) { | |
138 | 4 | return RightBoundPredicate.bind(new IsLessThan<T>(), right); |
139 | } | |
140 | ||
141 | } |