01: /*
02: * @(#)ResourceInputStreamGenerator.java
03: *
04: * Copyright (C) 2001,,2003 2002 Matt Albrecht
05: * groboclown@users.sourceforge.net
06: * http://groboutils.sourceforge.net
07: *
08: * Permission is hereby granted, free of charge, to any person obtaining a
09: * 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;
30: import java.io.IOException;
31:
32: /**
33: * A type of class which can generate a new InputStream based on just a
34: * partial name. Useful if a resource is loaded from a specific location
35: * (classpath resource, file system, URL, etc), and it references other
36: * resources which must be loaded relative to it.
37: *
38: * @author Matt Albrecht <a href="mailto:groboclown@users.sourceforge.net">groboclown@users.sourceforge.net</a>
39: * @since 0.9.1d Alpha (sometime in 2001)
40: * @version $Date: 2003/02/10 22:52:45 $
41: */
42: public class ResourceInputStreamGenerator implements
43: IInputStreamGenerator {
44: private String root;
45: private String orig;
46:
47: /**
48: * Accepts the name of the 1st file loaded. All files generated from
49: * this generator will be relative to its location.
50: */
51: public ResourceInputStreamGenerator(String originalName) {
52: this .orig = originalName;
53: int pos = originalName.lastIndexOf('.');
54: if (pos >= 0) {
55: originalName = originalName.substring(0, pos + 1);
56: } else {
57: originalName = "";
58: }
59: this .root = originalName;
60: }
61:
62: public String getFullName(String relativeName) {
63: if (!this .orig.equals(relativeName)) {
64: relativeName = this .root + relativeName;
65: }
66: return relativeName;
67: }
68:
69: public InputStream createInputStream(String relativeName)
70: throws IOException {
71: return ClassLoader
72: .getSystemResourceAsStream(getFullName(relativeName));
73: }
74: }
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