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


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
8  *
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) 2004-2005 Charles O Nutter <headius@headius.com>
15  * Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either of the GNU General Public License Version 2 or later (the "GPL"),
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28  ***** END LICENSE BLOCK *****/
29 package org.jruby.util;
30
31 import java.io.BufferedInputStream JavaDoc;
32 import java.io.IOException JavaDoc;
33 import java.io.InputStream JavaDoc;
34
35 import org.ablaf.ast.IAstDecoder;
36 import org.jruby.Ruby;
37 import org.jruby.ast.Node;
38 import org.jruby.ast.util.RubyAstMarshal;
39 import org.jruby.runtime.load.Library;
40 import org.jruby.runtime.load.LoadServiceResource;
41
42 /**
43  * Loading of pre-parsed, serialized, Ruby scripts that are built into JRuby.
44  */
45 public class PreparsedScript implements Library {
46     private LoadServiceResource resource;
47
48     public PreparsedScript(LoadServiceResource resource) {
49         this.resource = resource;
50     }
51
52     public void load(Ruby runtime) throws IOException JavaDoc {
53         runtime.loadNode("preparsed", getNode(runtime), false);
54     }
55
56     private Node getNode(Ruby runtime) throws IOException JavaDoc {
57         InputStream JavaDoc in;
58         try {
59             in = new BufferedInputStream JavaDoc(resource.getURL().openStream());
60         } catch (IOException JavaDoc e) {
61             throw runtime.newIOError("Resource not found: " + resource.getName());
62         }
63         IAstDecoder decoder = RubyAstMarshal.getInstance().openDecoder(in);
64         try {
65             return decoder.readNode();
66         } finally {
67             decoder.close();
68         }
69     }
70 }
71
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