01: /*
02: * Portions Copyright 2000-2007 Sun Microsystems, Inc. All Rights
03: * Reserved. Use is subject to license terms.
04: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
05: *
06: * This program is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU General Public License version
08: * 2 only, as published by the Free Software Foundation.
09: *
10: * This program is distributed in the hope that it will be useful, but
11: * WITHOUT ANY WARRANTY; without even the implied warranty of
12: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13: * General Public License version 2 for more details (a copy is
14: * included at /legal/license.txt).
15: *
16: * You should have received a copy of the GNU General Public License
17: * version 2 along with this work; if not, write to the Free Software
18: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
19: * 02110-1301 USA
20: *
21: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
22: * Clara, CA 95054 or visit www.sun.com if you need additional
23: * information or have any questions.
24: */
25: package gov.nist.siplite.parser;
26:
27: import gov.nist.core.*;
28: import gov.nist.siplite.header.*;
29:
30: /**
31: * Parser for Max Forwards Header.
32: *
33: * @version JAIN-SIP-1.1
34: *
35: *
36: * <a href="{@docRoot}/uncopyright.html">This code is in the public domain.</a>
37: *
38: * @version 1.0
39: */
40: public class MaxForwardsParser extends HeaderParser {
41: /** Default constructor. */
42: MaxForwardsParser() {
43: }
44:
45: /**
46: * Constructor with initial content length header string.
47: * @param contentLength initial contentlength header
48: */
49: public MaxForwardsParser(String contentLength) {
50: super (contentLength);
51: }
52:
53: /**
54: * Constructor with initial lexer engine.
55: * @param lexer initial lexer engine
56: */
57: protected MaxForwardsParser(Lexer lexer) {
58: super (lexer);
59: }
60:
61: /**
62: * Invokes parser for maximum forwards header field.
63: * @return the parsed maximum forwards header
64: * @exception ParseException if a parsing error occurs
65: */
66: public Header parse() throws ParseException {
67: if (debug)
68: dbg_enter("MaxForwardsParser.enter");
69: try {
70: MaxForwardsHeader maxForwards = new MaxForwardsHeader();
71: headerName(TokenTypes.MAX_FORWARDS);
72: String number = this .lexer.number();
73: maxForwards.setMaxForwards(Integer.parseInt(number));
74: this .lexer.SPorHT();
75: this .lexer.match('\n');
76: return maxForwards;
77: } catch (IllegalArgumentException ex) {
78: throw createParseException(ex.getMessage());
79: } finally {
80: if (debug)
81: dbg_leave("MaxForwardsParser.leave");
82: }
83: }
84: }
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