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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;
import javax.sip.*;

/**
 * Parser for SIP Session Expires Header. 
 *
 * 
 */
public class SessionExpiresParser extends ParametersParser {

	/**
	 * protected constructor.
	 * @param text is the text of the header to parse
	 */
	public SessionExpiresParser(String text) {
		super(text);
	}

	/**
	 * constructor.
	 * @param lexer is the lexer passed in from the enclosing parser.
	 */
	protected SessionExpiresParser(Lexer lexer) {
		super(lexer);
	}

	/**
	 * Parse the header.
	 */
	public SIPHeader parse() throws ParseException {
		SessionExpires se = new SessionExpires();
		if (debug)
			dbg_enter("parse");
		try {
			headerName(TokenTypes.SESSIONEXPIRES_TO);

			String nextId = lexer.getNextId();

			try {
				int delta = Integer.parseInt(nextId);
				se.setExpires(delta);
			} catch (NumberFormatException ex) {
				throw createParseException("bad integer format");
			} catch (InvalidArgumentException ex) {
				throw createParseException(ex.getMessage());
			}
			// May have parameters...
			this.lexer.SPorHT();
			super.parse(se);
			return se;

		} finally {
			if (debug)
				dbg_leave("parse");
		}

	}
	
	public static void main(String args[]) throws ParseException {
		String to[] =
			{   "Session-Expires: 30\n",
				"Session-Expires: 45;refresher=uac\n",
			};

		for (int i = 0; i < to.length; i++) {
			SessionExpiresParser tp = new SessionExpiresParser(to[i]);
			SessionExpires t = (SessionExpires) tp.parse();
			System.out.println("encoded = " + t.encode());
			System.out.println("\ntime=" + t.getExpires() );
			if ( t.getParameter("refresher") != null)
				System.out.println("refresher=" + t.getParameter("refresher") );
			
		}
	}
	

}