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Java > Open Source Codes > org > jruby > util > BuiltinScript


1 /***** BEGIN LICENSE BLOCK *****
2  * Version: CPL 1.0/GPL 2.0/LGPL 2.1
3  *
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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9  * Software distributed under the License is distributed on an "AS
10  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
11  * implied. See the License for the specific language governing
12  * rights and limitations under the License.
13  *
14  * Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
15  * Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
16  * Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
17  * Copyright (C) 2005 Charles O Nutter <headius@headius.com>
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30  ***** END LICENSE BLOCK *****/
31 package org.jruby.util;
32
33 import java.io.BufferedInputStream JavaDoc;
34 import java.io.IOException JavaDoc;
35 import java.io.InputStream JavaDoc;
36
37 import org.ablaf.ast.IAstDecoder;
38 import org.jruby.Ruby;
39 import org.jruby.ast.Node;
40 import org.jruby.ast.util.RubyAstMarshal;
41 import org.jruby.runtime.load.Library;
42
43 /**
44  * Loading of pre-parsed, serialized, Ruby scripts that are built into JRuby.
45  */
46 public class BuiltinScript implements Library {
47     private final String JavaDoc name;
48
49     public BuiltinScript(String JavaDoc name) {
50         this.name = name;
51     }
52
53     public void load(Ruby runtime) throws IOException JavaDoc {
54         runtime.loadNode("jruby builtin", getNode(runtime), false);
55     }
56
57     private Node getNode(Ruby runtime) throws IOException JavaDoc {
58         String JavaDoc resourceName = "/builtin/" + name + ".rb.ast.ser";
59         InputStream JavaDoc in = getClass().getResourceAsStream(resourceName);
60         if (in == null) {
61             throw runtime.newIOError("Resource not found: " + resourceName);
62         }
63         in = new BufferedInputStream JavaDoc(in);
64         IAstDecoder decoder = RubyAstMarshal.getInstance().openDecoder(in);
65         try {
66             return decoder.readNode();
67         } finally {
68             decoder.close();
69         }
70     }
71 }
72
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