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Java > Open Source Codes > net > sourceforge > groboutils > util > io > v1 > ResourceInputStreamGenerator


1 /*
2  * @(#)ResourceInputStreamGenerator.java
3  *
4  * Copyright (C) 2001,,2003 2002 Matt Albrecht
5  * groboclown@users.sourceforge.net
6  * http://groboutils.sourceforge.net
7  *
8  * Permission is hereby granted, free of charge, to any person obtaining a
9  * copy of this software and associated documentation files (the "Software"),
10  * to deal in the Software without restriction, including without limitation
11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12  * and/or sell copies of the Software, and to permit persons to whom the
13  * Software is furnished to do so, subject to the following conditions:
14  *
15  * The above copyright notice and this permission notice shall be included in
16  * all copies or substantial portions of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24  * DEALINGS IN THE SOFTWARE.
25  */
26
27 package net.sourceforge.groboutils.util.io.v1;
28
29 import java.io.InputStream JavaDoc;
30 import java.io.IOException JavaDoc;
31
32
33
34 /**
35  * A type of class which can generate a new InputStream based on just a
36  * partial name. Useful if a resource is loaded from a specific location
37  * (classpath resource, file system, URL, etc), and it references other
38  * resources which must be loaded relative to it.
39  *
40  * @author Matt Albrecht <a HREF="mailto:groboclown@users.sourceforge.net">groboclown@users.sourceforge.net</a>
41  * @since 0.9.1d Alpha (sometime in 2001)
42  * @version $Date: 2003/02/10 22:52:45 $
43  */
44 public class ResourceInputStreamGenerator implements IInputStreamGenerator
45 {
46     private String JavaDoc root;
47     private String JavaDoc orig;
48     
49     /**
50      * Accepts the name of the 1st file loaded. All files generated from
51      * this generator will be relative to its location.
52      */
53     public ResourceInputStreamGenerator( String JavaDoc originalName )
54     {
55         this.orig = originalName;
56         int pos = originalName.lastIndexOf('.');
57         if (pos >= 0)
58         {
59             originalName = originalName.substring( 0, pos+1 );
60         }
61         else
62         {
63             originalName = "";
64         }
65         this.root = originalName;
66     }
67     
68     
69     public String JavaDoc getFullName( String JavaDoc relativeName )
70     {
71         if (!this.orig.equals( relativeName ))
72         {
73             relativeName = this.root + relativeName;
74         }
75         return relativeName;
76     }
77     
78     
79     public InputStream JavaDoc createInputStream( String JavaDoc relativeName )
80             throws IOException JavaDoc
81     {
82         return ClassLoader.getSystemResourceAsStream(
83             getFullName( relativeName ) );
84     }
85 }
86
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