Source Code Cross Referenced for AndPredicate.java in  » Library » Apache-common-Collections » org » apache » commons » collections » functors » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache common Collections » org.apache.commons.collections.functors 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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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