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Java > Open Source Codes > org > apache > hivemind > util > AbstractResource


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.hivemind.util;
16
17 import java.util.Locale JavaDoc;
18
19 import org.apache.hivemind.Resource;
20
21 /**
22  * Abstract implementation of {@link org.apache.hivemind.Resource}.
23  *
24  * <p>Resource instances act as a kind of factory for new instances
25  * of the same type, via {@link #newResource(String)}.
26  *
27  * @author Howard Lewis Ship
28  */
29 public abstract class AbstractResource implements Resource
30 {
31     private String JavaDoc _path;
32     private String JavaDoc _name;
33     private String JavaDoc _folderPath;
34     private Locale JavaDoc _locale;
35
36     protected AbstractResource(String JavaDoc path)
37     {
38         this(path, null);
39     }
40
41     protected AbstractResource(String JavaDoc path, Locale JavaDoc locale)
42     {
43         _path = path;
44         _locale = locale;
45     }
46
47     public String JavaDoc getName()
48     {
49         if (_name == null)
50             split();
51
52         return _name;
53     }
54
55     public Resource getRelativeResource(String JavaDoc name)
56     {
57         if (name.startsWith("/"))
58         {
59             if (name.equals(_path))
60                 return this;
61
62             return newResource(name);
63         }
64
65         if (_folderPath == null)
66             split();
67
68         if (name.equals(_name))
69             return this;
70
71         return newResource(_folderPath + name);
72     }
73
74     public String JavaDoc getPath()
75     {
76         return _path;
77     }
78
79     public Locale JavaDoc getLocale()
80     {
81         return _locale;
82     }
83
84
85     protected abstract Resource newResource(String JavaDoc path);
86
87     private void split()
88     {
89         int lastSlashx = _path.lastIndexOf('/');
90
91         _folderPath = _path.substring(0, lastSlashx + 1);
92         _name = _path.substring(lastSlashx + 1);
93     }
94
95
96     /**
97      * Returns true if the other object is an instance of the
98      * same class, and the paths are equal.
99      *
100      */
101
102     public boolean equals(Object JavaDoc obj)
103     {
104         if (obj == null)
105             return false;
106
107         if (obj.getClass().equals(getClass()))
108         {
109             AbstractResource otherLocation = (AbstractResource) obj;
110
111             return _path.equals(otherLocation._path);
112         }
113
114         return false;
115     }
116 }
117
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