01: /*
02: * Copyright 2001-2004 The Apache Software Foundation
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16: package org.apache.commons.collections.functors;
17:
18: import java.io.Serializable;
19:
20: import org.apache.commons.collections.Predicate;
21:
22: /**
23: * Predicate implementation that returns true if both the predicates return true.
24: *
25: * @since Commons Collections 3.0
26: * @version $Revision: 348444 $ $Date: 2005-11-23 14:06:56 +0000 (Wed, 23 Nov 2005) $
27: *
28: * @author Stephen Colebourne
29: */
30: public final class AndPredicate implements Predicate,
31: PredicateDecorator, Serializable {
32:
33: /** Serial version UID */
34: private static final long serialVersionUID = 4189014213763186912L;
35:
36: /** The array of predicates to call */
37: private final Predicate iPredicate1;
38: /** The array of predicates to call */
39: private final Predicate iPredicate2;
40:
41: /**
42: * Factory to create the predicate.
43: *
44: * @param predicate1 the first predicate to check, not null
45: * @param predicate2 the second predicate to check, not null
46: * @return the <code>and</code> predicate
47: * @throws IllegalArgumentException if either predicate is null
48: */
49: public static Predicate getInstance(Predicate predicate1,
50: Predicate predicate2) {
51: if (predicate1 == null || predicate2 == null) {
52: throw new IllegalArgumentException(
53: "Predicate must not be null");
54: }
55: return new AndPredicate(predicate1, predicate2);
56: }
57:
58: /**
59: * Constructor that performs no validation.
60: * Use <code>getInstance</code> if you want that.
61: *
62: * @param predicate1 the first predicate to check, not null
63: * @param predicate2 the second predicate to check, not null
64: */
65: public AndPredicate(Predicate predicate1, Predicate predicate2) {
66: super ();
67: iPredicate1 = predicate1;
68: iPredicate2 = predicate2;
69: }
70:
71: /**
72: * Evaluates the predicate returning true if both predicates return true.
73: *
74: * @param object the input object
75: * @return true if both decorated predicates return true
76: */
77: public boolean evaluate(Object object) {
78: return (iPredicate1.evaluate(object) && iPredicate2
79: .evaluate(object));
80: }
81:
82: /**
83: * Gets the two predicates being decorated as an array.
84: *
85: * @return the predicates
86: * @since Commons Collections 3.1
87: */
88: public Predicate[] getPredicates() {
89: return new Predicate[] { iPredicate1, iPredicate2 };
90: }
91:
92: }
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