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.siplite.header.*;
28: import java.util.*;
29: import gov.nist.core.*;
30:
31: /**
32: * Parser for SIP Date field. Converts from SIP Date to the
33: * internal storage (Calendar).
34: */
35: public class DateParser extends HeaderParser {
36: /** Default constructor. */
37: DateParser() {
38: }
39:
40: /**
41: * Constructor with initial date header string.
42: * @param date initial string to be parsed
43: */
44: public DateParser(String date) {
45: super (date);
46: }
47:
48: /**
49: * Constructor with initial lexer engine.
50: * @param lexer initial lexer engine
51: */
52: protected DateParser(Lexer lexer) {
53: super (lexer);
54: }
55:
56: /**
57: * Invokes parser for date header field.
58: * @return the parsed date header
59: */
60: public Header parse() throws ParseException {
61: if (debug)
62: dbg_enter("DateParser.parse");
63: try {
64: headerName(TokenTypes.DATE);
65: int w = wkday();
66: lexer.match(',');
67: lexer.match(' ');
68: Calendar cal = date();
69: lexer.match(' ');
70: time(cal);
71: lexer.match(' ');
72: String tzone = this .lexer.ttoken().toLowerCase();
73: if (!"gmt".equals(tzone))
74: throw createParseException("Bad Time Zone " + tzone);
75: DateHeader retval = new DateHeader();
76: retval.setDate(cal);
77: return retval;
78: } finally {
79: if (debug)
80: dbg_leave("DateParser.parse");
81: }
82: }
83: }
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