/*
* Conditions Of Use
*
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), an agency of the Federal Government.
* Pursuant to title 15 Untied States Code Section 105, works of NIST
* employees are not subject to copyright protection in the United States
* and are considered to be in the public domain. As a result, a formal
* license is not needed to use the software.
*
* This software is provided by NIST as a service and is expressly
* provided "AS IS." NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY. NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
*
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement
*
* .
*
*/
package gov.nist.javax.sip.parser;
import gov.nist.core.Debug;
import gov.nist.core.LexerCore;
import gov.nist.core.ParserCore;
import gov.nist.core.Token;
import java.text.ParseException;
/**
* Base parser class.
*
* @version 1.2 $Revision: 1.10 $ $Date: 2009-07-17 18:58:01 $
*
* @author M. Ranganathan <br/>
*
*
*/
public abstract class Parser extends ParserCore implements TokenTypes {
protected ParseException createParseException(String exceptionString) {
return new ParseException(
lexer.getBuffer() + ":" + exceptionString,
lexer.getPtr());
}
protected Lexer getLexer() {
return (Lexer) this.lexer;
}
protected String sipVersion() throws ParseException {
if (debug)
dbg_enter("sipVersion");
try {
Token tok = lexer.match(SIP);
if (!tok.getTokenValue().equalsIgnoreCase("SIP"))
createParseException("Expecting SIP");
lexer.match('/');
tok = lexer.match(ID);
if (!tok.getTokenValue().equals("2.0"))
createParseException("Expecting SIP/2.0");
return "SIP/2.0";
} finally {
if (debug)
dbg_leave("sipVersion");
}
}
/**
* parses a method. Consumes if a valid method has been found.
*/
protected String method() throws ParseException {
try {
if (debug)
dbg_enter("method");
Token[] tokens = this.lexer.peekNextToken(1);
Token token = (Token) tokens[0];
if (token.getTokenType() == INVITE
|| token.getTokenType() == ACK
|| token.getTokenType() == OPTIONS
|| token.getTokenType() == BYE
|| token.getTokenType() == REGISTER
|| token.getTokenType() == CANCEL
|| token.getTokenType() == SUBSCRIBE
|| token.getTokenType() == NOTIFY
|| token.getTokenType() == PUBLISH
|| token.getTokenType() == MESSAGE
|| token.getTokenType() == ID) {
lexer.consume();
return token.getTokenValue();
} else {
throw createParseException("Invalid Method");
}
} finally {
if (Debug.debug)
dbg_leave("method");
}
}
/**
* Verifies that a given string matches the 'token' production in RFC3261
*
* @param token
* @throws ParseException - if there are invalid characters
*
* @author JvB
*/
public static final void checkToken( String token ) throws ParseException {
if (token == null || token.length()==0 ) {
throw new ParseException("null or empty token", -1 );
} else {
// JvB: check that it is a valid token
for ( int i=0; i<token.length(); ++i ) {
if ( !LexerCore.isTokenChar( token.charAt(i) )) {
throw new ParseException( "Invalid character(s) in string (not allowed in 'token')", i );
}
}
}
}
}
/*
* $Log: not supported by cvs2svn $
* Revision 1.9 2008/01/18 11:19:24 jbemmel
* added a method to check strings for valid token characters
*
* Revision 1.8 2007/02/23 14:56:05 belangery
* Added performance improvement around header name lowercase conversion.
*
* Revision 1.7 2006/09/27 15:02:43 mranga
* Issue number:
* Obtained from:
* Submitted by:
* Reviewed by: mranga
* rfc 2543 transaction matching. fix for MESSAGE request type parsing.
* CVS: ----------------------------------------------------------------------
* CVS: Issue number:
* CVS: If this change addresses one or more issues,
* CVS: then enter the issue number(s) here.
* CVS: Obtained from:
* CVS: If this change has been taken from another system,
* CVS: then name the system in this line, otherwise delete it.
* CVS: Submitted by:
* CVS: If this code has been contributed to the project by someone else; i.e.,
* CVS: they sent us a patch or a set of diffs, then include their name/email
* CVS: address here. If this is your work then delete this line.
* CVS: Reviewed by:
* CVS: If we are doing pre-commit code reviews and someone else has
* CVS: reviewed your changes, include their name(s) here.
* CVS: If you have not had it reviewed then delete this line.
*
* Revision 1.6 2006/07/13 09:02:18 mranga
* Issue number:
* Obtained from:
* Submitted by: jeroen van bemmel
* Reviewed by: mranga
* Moved some changes from jain-sip-1.2 to java.net
*
* CVS: ----------------------------------------------------------------------
* CVS: Issue number:
* CVS: If this change addresses one or more issues,
* CVS: then enter the issue number(s) here.
* CVS: Obtained from:
* CVS: If this change has been taken from another system,
* CVS: then name the system in this line, otherwise delete it.
* CVS: Submitted by:
* CVS: If this code has been contributed to the project by someone else; i.e.,
* CVS: they sent us a patch or a set of diffs, then include their name/email
* CVS: address here. If this is your work then delete this line.
* CVS: Reviewed by:
* CVS: If we are doing pre-commit code reviews and someone else has
* CVS: reviewed your changes, include their name(s) here.
* CVS: If you have not had it reviewed then delete this line.
*
* Revision 1.5 2006/06/19 06:47:27 mranga
* javadoc fixups
*
* Revision 1.4 2006/06/16 15:26:28 mranga
* Added NIST disclaimer to all public domain files. Clean up some javadoc. Fixed a leak
*
* Revision 1.3 2005/11/21 23:24:49 jeroen
* "SIP" is case insensitive
*
* Revision 1.2 2005/10/27 20:49:00 jeroen
* added support for RFC3903 PUBLISH
*
* Revision 1.1.1.1 2005/10/04 17:12:35 mranga
*
* Import
*
*
* Revision 1.3 2004/01/22 13:26:31 sverker
* Issue number:
* Obtained from:
* Submitted by: sverker
* Reviewed by: mranga
*
* Major reformat of code to conform with style guide. Resolved compiler and javadoc warnings. Added CVS tags.
*
* CVS: ----------------------------------------------------------------------
* CVS: Issue number:
* CVS: If this change addresses one or more issues,
* CVS: then enter the issue number(s) here.
* CVS: Obtained from:
* CVS: If this change has been taken from another system,
* CVS: then name the system in this line, otherwise delete it.
* CVS: Submitted by:
* CVS: If this code has been contributed to the project by someone else; i.e.,
* CVS: they sent us a patch or a set of diffs, then include their name/email
* CVS: address here. If this is your work then delete this line.
* CVS: Reviewed by:
* CVS: If we are doing pre-commit code reviews and someone else has
* CVS: reviewed your changes, include their name(s) here.
* CVS: If you have not had it reviewed then delete this line.
*
*/