java/gov/nist/javax/sip/parser/RecordRouteParser.java

/*
* 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.javax.sip.header.RecordRoute;
import gov.nist.javax.sip.header.RecordRouteList;
import gov.nist.javax.sip.header.SIPHeader;

import java.text.ParseException;

/**
 * Parser for a list of route headers.
 *
 * @version 1.2 $Revision: 1.9 $ $Date: 2009/07/17 18:58:03 $
 *
 * @author Olivier Deruelle   <br/>
 * @author M. Ranganathan   <br/>
 *
 */
public class RecordRouteParser extends AddressParametersParser {

    /**
     * Constructor
     * @param recordRoute message to parse to set
     */
    public RecordRouteParser(String recordRoute) {
        super(recordRoute);
    }

    protected RecordRouteParser(Lexer lexer) {
        super(lexer);
    }

    /**
     * parse the String message and generate the RecordRoute List Object
     * @return SIPHeader the RecordRoute List object
     * @throws ParseException if errors occur during the parsing
     */
    public SIPHeader parse() throws ParseException {
        RecordRouteList recordRouteList = new RecordRouteList();

        if (debug)
            dbg_enter("RecordRouteParser.parse");

        try {
            this.lexer.match(TokenTypes.RECORD_ROUTE);
            this.lexer.SPorHT();
            this.lexer.match(':');
            this.lexer.SPorHT();
            while (true) {
                RecordRoute recordRoute = new RecordRoute();
                super.parse(recordRoute);
                recordRouteList.add(recordRoute);
                this.lexer.SPorHT();
                char la = lexer.lookAhead(0);
                if (la == ',') {
                    this.lexer.match(',');
                    this.lexer.SPorHT();
                } else if (la == '\n')
                    break;
                else
                    throw createParseException("unexpected char");
            }
            return recordRouteList;
        } finally {
            if (debug)
                dbg_leave("RecordRouteParser.parse");
        }

    }


}