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 org.apache.commons.functor.Predicate;
20
21 /**
22 * {@link #test Tests} <code>true</code> iff
23 * none of its children test <code>false</code>.
24 * Note that by this definition, the "and" of
25 * an empty collection of predicates tests <code>true</code>.
26 * <p>
27 * Note that although this class implements
28 * {@link java.io.Serializable Serializable}, a given instance will
29 * only be truly <code>Serializable</code> if all the
30 * underlying functors are. Attempts to serialize
31 * an instance whose delegates are not all
32 * <code>Serializable</code> will result in an exception.
33 * </p>
34 * @version $Revision: 1345136 $ $Date: 2012-06-01 09:47:06 -0300 (Fri, 01 Jun 2012) $
35 */
36 public final class And extends BasePredicateList {
37
38 // constructor
39 // ------------------------------------------------------------------------
40
41 /**
42 * serialVersionUID declaration.
43 */
44 private static final long serialVersionUID = -6053343095016685571L;
45
46 /**
47 * Create a new And.
48 */
49 public And() {
50 super();
51 }
52
53 /**
54 * Create a new And instance.
55 *
56 * @param predicates the predicates to add
57 */
58 public And(Iterable<Predicate> predicates) {
59 super(predicates);
60 }
61
62 /**
63 * Create a new And instance.
64 *
65 * @param predicates the predicates to add
66 */
67 public And(Predicate... predicates) {
68 super(predicates);
69 }
70
71 // modifiers
72 // ------------------------------------------------------------------------
73 /**
74 * Add a Predicate.
75 * @param p Predicate to add
76 * @return this
77 */
78 public And and(Predicate p) {
79 super.addPredicate(p);
80 return this;
81 }
82
83 // predicate interface
84 // ------------------------------------------------------------------------
85 /**
86 * {@inheritDoc}
87 */
88 public boolean test() {
89 for (Predicate p : getPredicateList()) {
90 if (!p.test()) {
91 return false;
92 }
93 }
94 return true;
95 }
96
97 /**
98 * {@inheritDoc}
99 */
100 @Override
101 public boolean equals(Object that) {
102 return that == this || (that instanceof And && equals((And) that));
103 }
104
105 /**
106 * Learn whether a given And is equal to this.
107 * @param that the And to test
108 * @return boolean
109 */
110 public boolean equals(And that) {
111 return getPredicateListEquals(that);
112 }
113
114 /**
115 * {@inheritDoc}
116 */
117 @Override
118 public int hashCode() {
119 return "And".hashCode() ^ getPredicateListHashCode();
120 }
121
122 /**
123 * {@inheritDoc}
124 */
125 @Override
126 public String toString() {
127 return "And<" + getPredicateListToString() + ">";
128 }
129
130 }