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


1 /*
2  * @(#)URLInputStreamGenerator.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 import java.net.URL JavaDoc;
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 URLInputStreamGenerator implements IInputStreamGenerator
45 {
46     private URL 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 URLInputStreamGenerator( String JavaDoc originalName )
54             throws IOException JavaDoc
55     {
56         this.orig = originalName;
57         URL JavaDoc url = new URL JavaDoc( originalName );
58         
59         // JDK 1.3 allows for getPath()...
60 String JavaDoc path = url.getFile();
61         int lastPos = path.lastIndexOf( '/' );
62         if (lastPos >= 0)
63         {
64             path = path.substring( 0, lastPos+1 );
65         }
66         this.root = new URL JavaDoc( url.getProtocol(), url.getHost(),
67             url.getPort(), path );
68     }
69     
70     public URL JavaDoc getURL( String JavaDoc relativeName )
71             throws IOException JavaDoc
72     {
73         URL JavaDoc url;
74         if (this.orig.equals( relativeName ))
75         {
76             url = new URL JavaDoc( relativeName );
77         }
78         else
79         {
80             url = new URL JavaDoc( this.root, relativeName );
81         }
82         return url;
83     }
84     
85     
86     public String JavaDoc getFullName( String JavaDoc relativeName )
87     {
88         try
89         {
90             return getURL( relativeName ).toString();
91         }
92         catch (IOException JavaDoc e)
93         {
94             return e.toString();
95         }
96     }
97     
98     
99     public InputStream JavaDoc createInputStream( String JavaDoc relativeName )
100             throws IOException JavaDoc
101     {
102         return getURL( relativeName ).openStream();
103     }
104 }
105
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