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


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) 2006 Ola Bini <Ola.Bini@ki.se>
15  *
16  * Alternatively, the contents of this file may be used under the terms of
17  * either of the GNU General Public License Version 2 or later (the "GPL"),
18  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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27  ***** END LICENSE BLOCK *****/
28 package org.jruby.util;
29
30 import java.io.OutputStream JavaDoc;
31 import java.io.IOException JavaDoc;
32 import org.jruby.RubyString;
33 import org.jruby.runtime.builtin.IRubyObject;
34
35 /**
36  * This class wraps a IRubyObject in an OutputStream. Depending on which messages
37  * the IRubyObject answers to, it will have different functionality.
38  *
39  * The point is that the IRubyObject could exhibit duck typing, in the style of IO versus StringIO, for example.
40  *
41  * At the moment, the only functionality supported is writing, and the only requirement on the io-object is
42  * that it responds to write() like IO.
43  *
44  * @author <a HREF="mailto:Ola.Bini@ki.se">Ola Bini</a>
45  */
46 public class IOOutputStream extends OutputStream JavaDoc {
47     private IRubyObject io;
48
49     /**
50      * Creates a new OutputStream with the object provided.
51      *
52      * @param io the ruby object
53      */
54     public IOOutputStream(final IRubyObject io) {
55         if(!io.respondsTo("write")) {
56             throw new IllegalArgumentException JavaDoc("Object: " + io + " is not a legal argument to this wrapper, cause it doesn't respond to \"write\".");
57         }
58         this.io = io;
59     }
60     
61     public void write(final int bite) throws IOException JavaDoc {
62         io.callMethod(io.getRuntime().getCurrentContext(), "write", RubyString.newString(io.getRuntime(), new ByteList(new byte[]{(byte)bite},false)));
63     }
64
65     public void write(final byte[] b) throws IOException JavaDoc {
66         write(b,0,b.length);
67     }
68
69     public void write(final byte[] b,final int off, final int len) throws IOException JavaDoc {
70         io.callMethod(io.getRuntime().getCurrentContext(),"write", RubyString.newString(io.getRuntime(), new ByteList(b, off, len, false)));
71     }
72 }
73
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