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Java > Open Source Codes > com > jeantessier > diff > DecoratorDifferences


1 /*
2  * Copyright (c) 2001-2005, Jean Tessier
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * * Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *
12  * * Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  *
16  * * Neither the name of Jean Tessier nor the names of his contributors
17  * may be used to endorse or promote products derived from this software
18  * without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32
33 package com.jeantessier.diff;
34
35 /**
36  * Extension point for adding data and/or behavior to nodes in the
37  * Differences hierarchy.
38  */
39 public abstract class DecoratorDifferences implements Differences {
40     private Differences component;
41
42     /**
43      * Only the DifferencesFactory can create instances of this class.
44      */
45     DecoratorDifferences(Differences component) {
46         this.component = component;
47     }
48
49     public Differences getComponent() {
50         return component;
51     }
52
53     public Differences getLeafComponent() {
54         Differences result = null;
55         
56         if (getComponent() instanceof DecoratorDifferences) {
57             result = ((DecoratorDifferences) getComponent()).getLeafComponent();
58         } else {
59             result = getComponent();
60         }
61         
62         return result;
63     }
64
65     public String JavaDoc getName() {
66         return getComponent().getName();
67     }
68     
69     public String JavaDoc toString() {
70         return getComponent().toString();
71     }
72 }
73
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