// HttpAcceptList.java
// $Id: HttpAcceptList.java,v 1.7 2000/08/16 21:37:59 ylafon Exp $
// (c) COPYRIGHT MIT and INRIA, 1996.
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.www.http;

import java.util.Vector;

public class HttpAcceptList extends BasicValue {
    HttpAccept accept[] = null;

    protected void parse() {
	Vector     va = new Vector(4);
	ParseState ps = new ParseState(roff, rlen);
	ps.separator  = (byte) ',';
	ps.spaceIsSep = false;
	while (HttpParser.nextItem(raw, ps) >= 0) {
	    HttpAccept a = new HttpAccept(this, raw, ps.start, ps.end);
	    va.addElement(a);
	    ps.prepare();
	}
	accept = new HttpAccept[va.size()];
	va.copyInto(accept);
    }

    protected void updateByteValue() {
	HttpBuffer buf = new HttpBuffer();
	if ( accept != null ) {
	    for (int i = 0 ; i < accept.length; i++) {
		if ( i > 0 )
		    buf.append(',');
		accept[i].appendValue(buf);
	    }
	    raw  = buf.getByteCopy();
	    roff = 0;
	    rlen = raw.length;
	} else {
	    raw  = new byte[0];
	    roff = 0;
	    rlen = 0;
	}
    }

    public Object getValue() {
	validate();
	return accept;
    }

    /**
     * Add an accept clause to that list.
     * @param a The new accept clause, as an instance of HttpAccept.
     */

    public void addAccept(HttpAccept a) {
	if ( accept == null ) {
	    accept    = new HttpAccept[1];
	    accept[0] = a;
	} else {
	    HttpAccept newacc[] = new HttpAccept[accept.length+1];
	    System.arraycopy(accept, 0, newacc, 0, accept.length);
	    newacc[accept.length] = a ;
	    accept = newacc;
	}
    }

    HttpAcceptList() {
	this.isValid = false;
    }

    HttpAcceptList(HttpAccept accept[]) {
	this.isValid = true;
	this.accept  = accept;
    }

}
