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package gov.nist.javax.sip.parser.extensions;

import gov.nist.javax.sip.header.*;
import gov.nist.javax.sip.header.extensions.*;
import gov.nist.javax.sip.parser.*;

import java.text.ParseException;

// Parser for Replaces Header (RFC3891)
// Extension by pmusgrave
//
// Replaces        = "Replaces" HCOLON callid *(SEMI replaces-param)
// replaces-param  = to-tag / from-tag / early-flag / generic-param
// to-tag          = "to-tag" EQUAL token
// from-tag        = "from-tag" EQUAL token
// early-flag      = "early-only"
//
// TODO Should run a test case on early-only
//

public class ReplacesParser extends ParametersParser {
	
	/**
	 * Creates new CallIDParser
	 * @param callID message to parse
	 */
	public ReplacesParser(String callID) {
		super(callID);
	}

	/**
	 * Constructor
	 * @param lexer Lexer to set
	 */
	protected ReplacesParser(Lexer lexer) {
		super(lexer);
	}

	/**
	 * parse the String message
	 * @return SIPHeader (CallID object)
	 * @throws ParseException if the message does not respect the spec.
	 */
	public SIPHeader parse() throws ParseException {
		if (debug)
			dbg_enter("parse");
		try {
			headerName(TokenTypes.REPLACES_TO);

			Replaces replaces = new Replaces();
			this.lexer.SPorHT();
			String callId = lexer.byteStringNoSemicolon();
			this.lexer.SPorHT();
			super.parse(replaces);
			replaces.setCallId(callId);
			return replaces;
		} finally {
			if (debug)
				dbg_leave("parse");
		}
	}

	public static void main(String args[]) throws ParseException {
		String to[] =
			{   "Replaces: 12345th5z8z\n",
				"Replaces: 12345th5z8z;to-tag=tozght6-45;from-tag=fromzght789-337-2\n",
			};

		for (int i = 0; i < to.length; i++) {
			ReplacesParser tp = new ReplacesParser(to[i]);
			Replaces t = (Replaces) tp.parse();
			System.out.println("Parsing => " + to[i]);
			System.out.print("encoded = " + t.encode() + "==> ");
			System.out.println("callId " + t.getCallId() + " from-tag=" + t.getFromTag()
					+ " to-tag=" + t.getToTag()) ; 
			
		}
	}

}