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 gov.nist.core.*;
29:
30: /**
31: * Parameters parser 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: */
39: public abstract class ParametersParser extends HeaderParser {
40: /** Current parsed parameters from the header line. */
41: protected ParametersHeader parametersHeader;
42:
43: /** Default constructor. */
44: protected ParametersParser() {
45: }
46:
47: /**
48: * Constructor with initial parameters header string.
49: * @param buffer initial parameters header
50: */
51: protected ParametersParser(String buffer) {
52: super (buffer);
53: }
54:
55: /**
56: * Constructor with initial lexer engine.
57: * @param lexer initial lexer engine
58: */
59: protected ParametersParser(Lexer lexer) {
60: super ((Lexer) lexer);
61: }
62:
63: /**
64: * Invokes parser for header field parameters.
65: * @param parametersHeader the parsed header field parameters
66: * @exception ParseException if a parsing error occurs
67: */
68: protected void parse(ParametersHeader parametersHeader)
69: throws ParseException {
70: this .lexer.SPorHT();
71: while (lexer.lookAhead(0) == ';') {
72: this .lexer.consume(1);
73: // this.lexer.match(';');
74: // eat white space
75: this .lexer.SPorHT();
76: NameValue nv = nameValue();
77:
78: // RFC 3261, p. 32:
79: // Even though an arbitrary number of parameter pairs may be
80: // attached to a header field value, any given parameter-name
81: // MUST NOT appear more than once.
82: if (parametersHeader.hasParameter(nv.getName())) {
83: throw new ParseException("Duplicated parameter: "
84: + nv.getName(), 0);
85: }
86:
87: parametersHeader.setParameter(nv);
88:
89: // eat white space
90: this.lexer.SPorHT();
91: }
92: }
93:
94: }
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