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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;

import gov.nist.javax.sip.address.AddressImpl;
import gov.nist.javax.sip.address.SipUri;
import gov.nist.javax.sip.header.Contact;
import gov.nist.javax.sip.header.ContactList;
import gov.nist.javax.sip.header.SIPHeader;

import javax.sip.address.URI;
import java.text.ParseException;
import java.util.HashSet;
import java.util.Iterator;

/**
 * A parser for The SIP contact header.
 * 
 * @version 1.2 $Revision: 1.11 $ $Date: 2007/02/06 16:40:02 $
 * @since 1.1
 */
public class ContactParser extends AddressParametersParser {

	public ContactParser(String contact) {
		super(contact);
	}

	protected ContactParser(Lexer lexer) {
		super(lexer);
		this.lexer = lexer;
	}

	public SIPHeader parse() throws ParseException {
		// past the header name and the colon.
		headerName(TokenTypes.CONTACT);
		ContactList retval = new ContactList();
		while (true) {
			Contact contact = new Contact();
			if (lexer.lookAhead(0) == '*') {
				final char next = lexer.lookAhead(1);
				if (next == ' ' || next == '\t' || next == '\r' || next == '\n') {
					this.lexer.match('*');
					contact.setWildCardFlag(true);
				} else {
					super.parse(contact);
				}
			} else {
				super.parse(contact);
			}
			AddressImpl address = (AddressImpl) contact.getAddress();
			URI uri = contact.getAddress().getURI();
			/*
			 * When the header field value contains a display name, the URI
			 * including all URI parameters is enclosed in "<" and ">". If no "<"
			 * and ">" are present, all parameters after the URI are header
			 * parameters, not URI parameters.
			 */
			if (address.getAddressType() == AddressImpl.ADDRESS_SPEC
					&& uri instanceof SipUri) {
				SipUri	 sipUri = (SipUri) uri;
				HashSet parameterNames = new HashSet();
				for (Iterator it = sipUri.getParameterNames(); it.hasNext(); ) {
					parameterNames.add(it.next());
				}
				// This avoids the concurrent modification exception.
				for (Iterator it = parameterNames.iterator(); it.hasNext();) {
					String name = (String) it.next();
					String val = sipUri.getParameter(name);
					sipUri.removeParameter(name);
					contact.setParameter(name,val);
				}
			}
			retval.add(contact);
			this.lexer.SPorHT();
			char la = lexer.lookAhead(0);
			if (la == ',') {
				this.lexer.match(',');
				this.lexer.SPorHT();
			} else if (la == '\n' || la == '\0')
				break;
			else
				throw createParseException("unexpected char");
		}
		return retval;
	}

}