KickJava   Java API By Example, From Geeks To Geeks.

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


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@ologix.com>
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"),
19  * in which case the provisions of the GPL or the LGPL are applicable instead
20  * of those above. If you wish to allow use of your version of this file only
21  * under the terms of either the GPL or the LGPL, and not to allow others to
22  * use your version of this file under the terms of the CPL, indicate your
23  * decision by deleting the provisions above and replace them with the notice
24  * and other provisions required by the GPL or the LGPL. If you do not delete
25  * the provisions above, a recipient may use your version of this file under
26  * the terms of any one of the CPL, the GPL or the LGPL.
27  ***** END LICENSE BLOCK *****/
28 /**
29  * $Id$
30  */
31 package org.jruby.util;
32
33 import java.io.IOException JavaDoc;
34 import java.io.Reader JavaDoc;
35
36 import org.jruby.RubyString;
37 import org.jruby.runtime.builtin.IRubyObject;
38
39 /**
40  * @author <a HREF="mailto:ola.bini@ki.se">Ola Bini</a>
41  * @version $Revision$
42  */
43 public class IOReader extends Reader JavaDoc {
44     private IRubyObject io;
45
46     public IOReader(final IRubyObject io) {
47         if(!io.respondsTo("read")) {
48             throw new IllegalArgumentException JavaDoc("Object: " + io + " is not a legal argument to this wrapper, cause it doesn't respond to \"read\".");
49         }
50         this.io = io;
51     }
52
53     public void close() throws IOException JavaDoc {
54         if(io.respondsTo("close")) {
55             io.callMethod(io.getRuntime().getCurrentContext(), "close");
56         }
57     }
58
59     public int read(final char[] arr, final int off, final int len) {
60         final IRubyObject read = io.callMethod(io.getRuntime().getCurrentContext(),"read", io.getRuntime().newFixnum(len));
61         if(read.isNil() || ((RubyString)read).getValue().length() == 0) {
62             return -1;
63         } else {
64             final RubyString str = (RubyString)read;
65             final CharSequence JavaDoc val = str.getValue();
66             System.arraycopy(val.toString().toCharArray(),0,arr,off,val.length());
67             return val.length();
68         }
69     }
70 }// IOReader
71
72
Popular Tags