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Java > Open Source Codes > org > jruby > runtime > load > JarredScript


1 /***** BEGIN LICENSE BLOCK *****
2  * Version: CPL 1.0/GPL 2.0/LGPL 2.1
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4  * The contents of this file are subject to the Common Public
5  * License Version 1.0 (the "License"); you may not use this file
6  * except in compliance with the License. You may obtain a copy of
7  * the License at http://www.eclipse.org/legal/cpl-v10.html
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10  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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12  * rights and limitations under the License.
13  *
14  * Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
15  * Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
16  * Copyright (C) 2005 Charles O Nutter <headius@headius.com>
17  * Copyright (C) 2005 Thomas E. Enebo <enebo@acm.org>
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31 package org.jruby.runtime.load;
32
33 import java.io.BufferedInputStream JavaDoc;
34 import java.io.FileNotFoundException JavaDoc;
35 import java.io.IOException JavaDoc;
36 import java.io.InputStreamReader JavaDoc;
37 import java.net.URL JavaDoc;
38 import java.util.jar.JarEntry JavaDoc;
39 import java.util.jar.JarInputStream JavaDoc;
40 import java.util.jar.Manifest JavaDoc;
41
42 import org.jruby.Ruby;
43 import org.jruby.runtime.builtin.IRubyObject;
44 import org.jruby.runtime.load.LoadServiceResource;
45
46 /**
47  * Loading of Ruby scripts packaged in Jar files.
48  *
49  * Usually the Ruby scripts are accompanied by Java class files in the Jar.
50  *
51  */
52 public class JarredScript implements Library {
53     private final LoadServiceResource resource;
54
55     public JarredScript(LoadServiceResource resource) {
56         this.resource = resource;
57     }
58
59     public LoadServiceResource getResource() {
60         return this.resource;
61     }
62
63     public void load(Ruby runtime) {
64         URL JavaDoc jarFile = resource.getURL();
65
66         // Make Java class files in the jar reachable from Ruby
67 runtime.getJavaSupport().addToClasspath(jarFile);
68
69         try {
70             JarInputStream JavaDoc in = new JarInputStream JavaDoc(new BufferedInputStream JavaDoc(jarFile.openStream()));
71
72             Manifest JavaDoc mf = in.getManifest();
73             String JavaDoc rubyInit = mf.getMainAttributes().getValue("Ruby-Init");
74             if (rubyInit != null) {
75                 JarEntry JavaDoc entry = in.getNextJarEntry();
76                 while (entry != null && !entry.getName().equals(rubyInit)) {
77                     entry = in.getNextJarEntry();
78                 }
79                 if (entry != null) {
80                     IRubyObject old = runtime.getGlobalVariables().isDefined("$JAR_URL") ? runtime.getGlobalVariables().get("$JAR_URL") : runtime.getNil();
81                     try {
82                         runtime.getGlobalVariables().set("$JAR_URL", runtime.newString("jar:" + jarFile + "!/"));
83                         runtime.loadScript("init", new InputStreamReader JavaDoc(in), false);
84                     } finally {
85                         runtime.getGlobalVariables().set("$JAR_URL", old);
86                     }
87                 }
88             }
89             in.close();
90         } catch (FileNotFoundException JavaDoc e) {
91             throw runtime.newIOErrorFromException(e);
92         } catch (IOException JavaDoc e) {
93             throw runtime.newIOErrorFromException(e);
94         }
95     }
96 }
97
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