01: /*
02: *
03: *
04: * Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
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 version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: */
26:
27: package gov.nist.siplite.parser;
28:
29: import gov.nist.core.*;
30: import gov.nist.siplite.header.*;
31:
32: /**
33: * Parser for parameterless headers.
34: */
35: public class ParameterLessParser extends HeaderParser {
36: /** Default constructor. */
37: protected ParameterLessParser() {
38: }
39:
40: /**
41: * Constructor with header value.
42: * @param value full header value respresented as a string
43: */
44: public ParameterLessParser(String value) {
45: super (value);
46: }
47:
48: /**
49: * Constructor with initial lexer engine.
50: * @param lexer initial lexer engine
51: */
52: protected ParameterLessParser(Lexer lexer) {
53: super (lexer);
54: }
55:
56: /**
57: * Invokes parser for a parameterless header.
58: * @return the parsed ParameterLessHeader
59: * @throws ParseException if a parsing error occurs
60: */
61: public Header parse() throws ParseException {
62: try {
63: String name = lexer.getNextToken(':');
64: lexer.consume(1);
65: String value = lexer.getLine().trim();
66:
67: // Some parameterless headers (for ex., RACK) have corresponding
68: // classes but share this parser so we have to check the name
69: // of header to decide which class to create.
70: ParameterLessHeader retval;
71:
72: if (name.equalsIgnoreCase(Header.RACK)) {
73: retval = new RAckHeader();
74: retval.setHeaderValue(value);
75: } else if (name.equalsIgnoreCase(Header.RSEQ)) {
76: retval = new RSeqHeader();
77: retval.setHeaderValue(value);
78: } else {
79: retval = new ParameterLessHeader(name, value);
80: }
81:
82: return retval;
83: } catch (Exception e) {
84: throw new ParseException("Error in parse(): "
85: + e.getMessage(), 0);
86: }
87: }
88: }
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