gov.nist.javax.sip.parser.Parser Maven / Gradle / Ivy
/*
* 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
*
*
*/
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