01: /*
02: * StringOutputStream.java
03: *
04: * Copyright (C) 2002-2003 Peter Graves
05: * $Id: StringOutputStream.java,v 1.6 2003/11/15 11:03:29 beedlem Exp $
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * 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: import java.io.StringWriter;
25:
26: public final class StringOutputStream extends CharacterOutputStream {
27: private final StringWriter stringWriter;
28:
29: public StringOutputStream() {
30: super ();
31: setWriter(stringWriter = new StringWriter());
32: }
33:
34: public LispClass classOf() {
35: return BuiltInClass.STRING_STREAM;
36: }
37:
38: public LispString getString() {
39: String s = stringWriter.toString();
40: stringWriter.getBuffer().setLength(0);
41: return new LispString(s);
42: }
43:
44: public String toString() {
45: StringBuffer sb = new StringBuffer("#<STRING-OUTPUT-STREAM ");
46: sb.append(super .toString());
47: sb.append('>');
48: return sb.toString();
49: }
50:
51: // ### make-string-output-stream
52: // make-string-output-stream &key element-type => string-stream
53: private static final Primitive MAKE_STRING_OUTPUT_STREAM = new Primitive(
54: "make-string-output-stream") {
55: public LispObject execute(LispObject[] args)
56: throws ConditionThrowable {
57: if (args.length > 1)
58: throw new ConditionThrowable(
59: new WrongNumberOfArgumentsException(this ));
60: // FIXME Ignore arg for now.
61: return new StringOutputStream();
62: }
63: };
64:
65: // ### get-output-stream-string
66: // get-output-stream-string string-output-stream => string
67: private static final Primitive1 GET_OUTPUT_STREAM_STRING = new Primitive1(
68: "get-output-stream-string") {
69: public LispObject execute(LispObject arg)
70: throws ConditionThrowable {
71: if (arg instanceof StringOutputStream)
72: return ((StringOutputStream) arg).getString();
73: throw new ConditionThrowable(new TypeError(this ,
74: "string output stream"));
75: }
76: };
77: }
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