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 * @param <A> the predicate argument type.
27 * @version $Revision: 1537602 $ $Date: 2013-10-31 20:53:09 +0100 (Do, 31 Okt 2013) $
28 */
29 public final class And<A> extends BasePredicateList<A> {
30
31 // constructor
32 // ------------------------------------------------------------------------
33 /**
34 * Create a new And.
35 */
36 public And() {
37 super();
38 }
39
40 /**
41 * Create a new And instance.
42 *
43 * @param predicates the predicates to put in and.
44 */
45 public And(Iterable<Predicate<? super A>> predicates) {
46 super(predicates);
47 }
48
49 /**
50 * Create a new And instance.
51 *
52 * @param predicates the predicates to put in and.
53 */
54 public And(Predicate<? super A>... predicates) {
55 super(predicates);
56 }
57
58 // modifiers
59 // ------------------------------------------------------------------------
60 /**
61 * Fluently add a Predicate.
62 * @param p Predicate to add
63 * @return this
64 */
65 public And<A> and(Predicate<? super A> p) {
66 super.addPredicate(p);
67 return this;
68 }
69
70 // predicate interface
71 // ------------------------------------------------------------------------
72 /**
73 * {@inheritDoc}
74 */
75 public boolean test(A obj) {
76 for (Predicate<? super A> p : getPredicateList()) {
77 if (!p.test(obj)) {
78 return false;
79 }
80 }
81 return true;
82 }
83
84 /**
85 * {@inheritDoc}
86 */
87 @Override
88 public boolean equals(Object obj) {
89 if (obj == this) {
90 return true;
91 }
92 if (!(obj instanceof And<?>)) {
93 return false;
94 }
95 And<?> that = (And<?>) obj;
96 return getPredicateListEquals(that);
97 }
98
99 /**
100 * {@inheritDoc}
101 */
102 @Override
103 public int hashCode() {
104 return "And".hashCode() ^ getPredicateListHashCode();
105 }
106
107 /**
108 * {@inheritDoc}
109 */
110 @Override
111 public String toString() {
112 return "And<" + getPredicateListToString() + ">";
113 }
114
115 }