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  /*
   * 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;
 
 
 
Lexer class for the parser.

Author(s):
M. Ranganathan
Version:
1.2
public class Lexer extends LexerCore {
    
get the header name of the line

Returns:
the header name (stuff before the :) bug fix submitted by zvali@dev.java.net
    public static String getHeaderName(String line) {
        if (line == null)
            return null;
        String headerName = null;
        try {
            int begin = line.indexOf(":");
            headerName = null;
            if (begin >= 1)
                headerName = line.substring(0, begin).trim();
        } catch (IndexOutOfBoundsException e) {
            return null;
        }
        return headerName;
    }
    public Lexer(String lexerNameString buffer) {
        super(lexerNamebuffer);
        this.selectLexer(lexerName);
    }

    
get the header value of the line

Returns:
String
    public static String getHeaderValue(String line) {
        if (line == null)
            return null;
        String headerValue = null;
        try {
            int begin = line.indexOf(":");
            headerValue = line.substring(begin + 1);
        } catch (IndexOutOfBoundsException e) {
            return null;
        }
        return headerValue;
    }
    public void selectLexer(String lexerName) {
        // Synchronization Bug fix by Robert Rosen.
    	ConcurrentHashMap<StringIntegerlexer = .get(lexerName);
        this. = lexerName;
        if (lexer == null) {
        	ConcurrentHashMap<StringIntegernewLexer  = new ConcurrentHashMap<StringInteger>();
        	lexer = .putIfAbsent(lexerNamenewLexer);
            if (lexer == null) {
                // put succeeded, use new value
                lexer = newLexer;                    
            }
             = lexer;
//          addLexer(lexerName);
            if (lexerName.equals("method_keywordLexer")) {
                addKeyword(..);
                addKeyword(..);
                addKeyword(..);
                addKeyword(..);
                addKeyword(..);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..);
                addKeyword(..);
                addKeyword(..);
                // JvB: added to support RFC3903
                addKeyword(..);
            } else if (lexerName.equals("command_keywordLexer")) {
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                // And now the dreaded short forms....
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .); // JvB: added
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .); // Bug
                                                                            // fix
                                                                            // by
                                                                            // Mario
                                                                            // Mantak
                addKeyword(..toUpperCase(), .); // Bug fix by Jozef Saniga
                
                // JvB: added to support RFC3903
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                // pmusgrave: Add RFC4028 and ReferredBy
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                // pmusgrave RFC3891
                addKeyword(..toUpperCase(),
                        .);
                //jean deruelle RFC3911
                addKeyword(..toUpperCase(),
                        .);
                // IMS Headers
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                // issued by Miguel Freitas
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(.
                        .toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                addKeyword(..toUpperCase(),
                        .);
                // added by aayush@rancore
                addKeyword(..toUpperCase(),
                        .);
                // added by aayush@rancore
                addKeyword(..toUpperCase(),
                        .);
                // added by aayush@rancore
                addKeyword(..toUpperCase(),
                        .);
                // added by aayush@rancore
                addKeyword(..toUpperCase(),
                        .);
                // added by aayush@rancore
                addKeyword(..toUpperCase(),
                        .);
                
                // added References header
                // end //
            } else if (lexerName.equals("status_lineLexer")) {
                addKeyword(..toUpperCase(), .);
            } else if (lexerName.equals("request_lineLexer")) {
                addKeyword(..toUpperCase(), .);
            } else if (lexerName.equals("sip_urlLexer")) {
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .);
                addKeyword(..toUpperCase(), .);
            }
        } else {
        	 = lexer;
        }
    }
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