content: /*
  * 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 gov2.nist.javax2.sip.parser;
  import gov2.nist.core.*;
  import gov2.nist.javax2.sip.header.*;
  
  import java.text.ParseException;
  
  import javax2.sip.*;
  
  /**
   * Accept-Encoding SIP (HTTP) Header parser.
   *
   * @version 1.2 $Revision: 1.7 $ $Date: 2009/07/17 18:57:56 $
   *
   * @author Olivier Deruelle
   * @author M. Ranganathan
   *
   *
   * <pre>
   *
   *   The Accept-Encoding request-header field is similar to Accept, but
   *   restricts the content-codings (section 3.5) that are acceptable in
   *   the response.
   *
   *
   *       Accept-Encoding  = "Accept-Encoding" ":"
   *                      ( encoding *( "," encoding) )
   *       encoding         = ( codings *[ ";" "q" "=" qvalue ] )
   *       codings          = ( content-coding | "*" )
   *
   *   Examples of its use are:
   *
   *       Accept-Encoding: compress, gzip
   *       Accept-Encoding:
   *       Accept-Encoding: *
   *       Accept-Encoding: compress;q=0.5, gzip;q=1.0
   *       Accept-Encoding: gzip;q=1.0, identity; q=0.5, *;q=0
   * </pre>
   *
   */
  public class AcceptEncodingParser extends HeaderParser {
  
      /**
       * Constructor
       * @param acceptEncoding message to parse
       */
      public AcceptEncodingParser(String acceptEncoding) {
          super(acceptEncoding);
      }
  
      /**
       * Constructor
       * @param lexer Lexer to set
       */
      protected AcceptEncodingParser(Lexer lexer) {
          super(lexer);
      }
  
      /**
       * parse the String message
       * @return SIPHeader (AcceptEncoding object)
       * @throws ParseException if the message does not respect the spec.
       */
      public SIPHeader parse() throws ParseException {
          AcceptEncodingList acceptEncodingList = new AcceptEncodingList();
          if (debug)
              dbg_enter("AcceptEncodingParser.parse");
  
          try {
              headerName(TokenTypes.ACCEPT_ENCODING);
              // empty body is fine for this header.
              if (lexer.lookAhead(0) == '\n') {
                  AcceptEncoding acceptEncoding = new AcceptEncoding();
                  acceptEncodingList.add(acceptEncoding);
              } else {
                  while (lexer.lookAhead(0) != '\n') {
                      AcceptEncoding acceptEncoding = new AcceptEncoding();
                      if (lexer.lookAhead(0) != ';') {
                          // Content-Coding:
                          lexer.match(TokenTypes.ID);
                          Token value = lexer.getNextToken();
                          acceptEncoding.setEncoding(value.getTokenValue());
                      }
  
                      while (lexer.lookAhead(0) == ';') {
                          this.lexer.match(';');
                          this.lexer.SPorHT();
                          this.lexer.match('q');
                          this.lexer.SPorHT();
                          this.lexer.match('=');
                          this.lexer.SPorHT();
                          lexer.match(TokenTypes.ID);
                          Token value = lexer.getNextToken();
                          try {
                              float qv = Float.parseFloat(value.getTokenValue());
                              acceptEncoding.setQValue(qv);
                          } catch (NumberFormatException ex) {
                              throw createParseException(ex.getMessage());
                          } catch (InvalidArgumentException ex) {
                              throw createParseException(ex.getMessage());
                          }
                          this.lexer.SPorHT();
                      }
  
                      acceptEncodingList.add(acceptEncoding);
                      if (lexer.lookAhead(0) == ',') {
                          this.lexer.match(',');
                          this.lexer.SPorHT();
                      }
  
                  }
              }
              return acceptEncodingList;
          } finally {
              if (debug)
                  dbg_leave("AcceptEncodingParser.parse");
          }
      }
  }
  /*
   * $Log: AcceptEncodingParser.java,v $
   * Revision 1.7  2009/07/17 18:57:56  emcho
   * Converts indentation tabs to spaces so that we have a uniform indentation policy in the whole project.
   *
   * Revision 1.6  2006/07/13 09:02:03  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 1.3  2006/06/19 06:47:27  mranga
   * javadoc fixups
   *
   * Revision 1.2  2006/06/16 15:26:28  mranga
   * Added NIST disclaimer to all public domain files. Clean up some javadoc. Fixed a leak
   *
   * Revision 1.1.1.1  2005/10/04 17:12:35  mranga
   *
   * Import
   *
   *
   * Revision 1.4  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.
   *
   */
  