Source Code Cross Referenced for ConstantFactory.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.Factory;
21:
22:        /**
23:         * Factory implementation that returns the same constant each time.
24:         * <p>
25:         * No check is made that the object is immutable. In general, only immutable
26:         * objects should use the constant factory. Mutable objects should
27:         * use the prototype factory.
28:         * 
29:         * @since Commons Collections 3.0
30:         * @version $Revision: 348444 $ $Date: 2005-11-23 14:06:56 +0000 (Wed, 23 Nov 2005) $
31:         *
32:         * @author Stephen Colebourne
33:         */
34:        public class ConstantFactory implements  Factory, Serializable {
35:
36:            /** Serial version UID */
37:            private static final long serialVersionUID = -3520677225766901240L;
38:
39:            /** Returns null each time */
40:            public static final Factory NULL_INSTANCE = new ConstantFactory(
41:                    null);
42:
43:            /** The closures to call in turn */
44:            private final Object iConstant;
45:
46:            /**
47:             * Factory method that performs validation.
48:             *
49:             * @param constantToReturn  the constant object to return each time in the factory
50:             * @return the <code>constant</code> factory.
51:             */
52:            public static Factory getInstance(Object constantToReturn) {
53:                if (constantToReturn == null) {
54:                    return NULL_INSTANCE;
55:                }
56:                return new ConstantFactory(constantToReturn);
57:            }
58:
59:            /**
60:             * Constructor that performs no validation.
61:             * Use <code>getInstance</code> if you want that.
62:             * 
63:             * @param constantToReturn  the constant to return each time
64:             */
65:            public ConstantFactory(Object constantToReturn) {
66:                super ();
67:                iConstant = constantToReturn;
68:            }
69:
70:            /**
71:             * Always return constant.
72:             * 
73:             * @return the stored constant value
74:             */
75:            public Object create() {
76:                return iConstant;
77:            }
78:
79:            /**
80:             * Gets the constant.
81:             * 
82:             * @return the constant
83:             * @since Commons Collections 3.1
84:             */
85:            public Object getConstant() {
86:                return iConstant;
87:            }
88:
89:        }
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