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Java > Open Source Codes > org > armedbear > lisp > input_stream_p


1 /*
2  * input_stream_p.java
3  *
4  * Copyright (C) 2004 Peter Graves
5  * $Id: input_stream_p.java,v 1.4 2004/01/31 20:11:13 piso Exp $
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20  */
21
22 package org.armedbear.lisp;
23
24 // ### input-stream-p
25 public final class input_stream_p extends Primitive1
26 {
27     private input_stream_p()
28     {
29         super("input-stream-p");
30     }
31
32     public LispObject execute(LispObject arg) throws ConditionThrowable
33     {
34         try {
35             return ((Stream)arg).isInputStream() ? T : NIL;
36         }
37         catch (ClassCastException JavaDoc e) {
38             return signal(new TypeError(arg, Symbol.STREAM));
39         }
40     }
41
42     private static final Primitive1 INPUT_STREAM_P = new input_stream_p();
43 }
44
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