/*
 *   
 *
 * Copyright  1990-2009 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 only, as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License version 2 for more details (a copy is
 * included at /legal/license.txt).
 * 
 * You should have received a copy of the GNU General Public License
 * version 2 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions.
 */

package gov.nist.siplite.parser;

import gov.nist.core.*;
import gov.nist.siplite.header.*;

/**
 * Parser for content type header.
 *
 *
 *
 */
public class AcceptContactParser extends ParametersParser {
    /** Default constructor. */
    AcceptContactParser() {}
    
    /**
     * Constructor with initial lexer engine.
     * @param lexer initial lexer engine
     */
    protected AcceptContactParser(Lexer lexer) {
        super(lexer);
    }
    
    /**
     * Invokes parser for content type header field.
     * @return the parsed content type header
     * @exception ParseException if a parsing error occurs
     */
    public Header parse() throws ParseException {
        HeaderList hdrList = new HeaderList(Header.ACCEPT_CONTACT);
        
        this.headerName(TokenTypes.ACCEPT_CONTACT);
        
        // first symbol must be star (RFC 3841)
        lexer.match(TokenTypes.STAR);
        this.lexer.SPorHT();
        
        while (true) {
            AcceptContactHeader acceptContact = new AcceptContactHeader();
            super.parse(acceptContact);
            hdrList.add(acceptContact);
            this.lexer.SPorHT();
            if (lexer.lookAhead(0) == ',') {
                this.lexer.match(',');
                this.lexer.SPorHT();
            } else if (lexer.lookAhead(0) == '\n') {
                break;
            } else {
                throw createParseException("unexpected char");
            }            
        }
        return hdrList;        
    }
    
}