w3c.model.www.pep.altlib.HttpRawBag

// HttpRawBag.java
// $Id: HttpRawBag.java,v 1.1 1997/07/21 21:55:35 eric Exp $
// COPYRIGHT

package w3c.model.www.pep.altlib;

import java.util.*;

/**
 * Internal representation of protocol headers conforming to the bag spec.
 * The <strong>bag</strong> specification is part of the Protocol Extension
 * Protocol defined by w3c, it can be found
 * <a href="http://www.w3.org/hypertext/WWW/TR/WD-http-pep.html>here</a>.
 */

abstract public class HttpRawBag extends BasicValue 
    boolean		isToplevel	= false;
    String		name		= null ;

    public Object getValue() {return this;}

    protected abstract HttpRawBag lookupSubBag (String name) throws HttpParserException;
    protected abstract void complete () throws HttpParserException;
    protected abstract void addElement (String atom) throws HttpParserException;

    protected HttpRawBag parseBag(ParseState ps)
    throws
    HttpParserException{
    StringBuffer sb =  StringBuffer();
    int i  = ps.ioff;
    byte b = ps.raw[i];

    // skip spaces, check for opening bracket
//    while ((i < ps.bufend) && ((b = ps.raw[i]) <= 32)) !!!
    while ((i < ps.bufend) && ((b = ps.raw[i]) <= 32) && (b != ',')))
	i++;
    if ( i >= ps.bufend ))
	return null ;
    if (b != '{'))
	error("Invalid Bag format (no {).") ;
    // skip spaces, bag list separators, get the bag name
//    for (++i; (i < ps.bufend) && ((b = ps.raw[i]) <= 32) ; i++) !!!
    for (++i; (i < ps.bufend) && ((b = ps.raw[i]) <= 32) && (b != ','); i++))
	;
    if ( i >= ps.bufend ))
	error("Invalid Bag format (no name).") ;
//    while ((i < ps.bufend) && ((b = ps.raw[i]) > 32) && (b != '}') && (b != '{')) { !!!
    while ((i < ps.bufend) && ((b = ps.raw[i]) > 32) && (b != ',') && (b != '}') && (b != '{'))) {
	 sb.append ((char) b);
	i++;
    }
    HttpRawBag bag;
    if ((bag = lookupSubBag(sb.toString())) == null))
	throw  HttpParserException("no parser for ""+sb.toString()+"".");
    bag.parseItems(sb, ps, i);
    bag.complete();
    return bag;
    }

    protected void parseItems(StringBuffer sb, ParseState ps, int i)
    throws
    HttpParserException{
    byte b;
    while (i < ps.bufend)) {
	b = ps.raw[i];
//	if ( b <= 32 ) { !!!
	if ( b <= 32  || b == ',' )) {
	    i++;
	    continue ;
	} elseif ( b == '}' )) {
	    ps.ooff = i+1;
	    return;
	} elseif ( b == '{' )) {
	    ParseState inc =  ParseState(i, ps.bufend, ps.raw);
	    HttpRawBag subbag =  parseBag (inc);
	    i = inc.ooff;
	} elseif ( b == '"')) {
	    // get quoted string (FIXME, escape chars !)
	    sb.setLength(0);
	    i++;
	     sb.append ((char) '"') ;
	    while ((i < ps.bufend) && ((b = ps.raw[i]) != '"'))) {
		 sb.append ((char) b) ;
		i++;
	    }
	     sb.append ((char) '"') ;
	    addElement(sb.toString());
	    i++;
	} else {
	    // get token (FIXME, see token spec and tspecials)
	    sb.setLength(0) ;
//	    while ((i < ps.bufend) && ((b = ps.raw[i]) > 32) && (b != '}')) { !!!
	    while ((i < ps.bufend) && ((b = ps.raw[i]) > 32) && (b != ',') && (b != '}'))) {
		 sb.append ((char) b) ;
		i++;
	    }
	    addElement(sb.toString());
	}
    }
    return;
    }

    public final void parse()
    throws
    HttpParserException{
    int i = roff;
    // Parses a list of bags:
    isToplevel  = true;
    HttpRawBag top = this;
    while ( i < rlen )) {
	switch(raw[i])) {
	case '{'
	    ParseState ps  =  ParseState(i, rlen, raw);
	    HttpRawBag	bag = parseBag(ps);
	    i = ps.ooff;
	    break;
	case ' '
	case 't'
	case ','
	    i++;
	    break;
	default:
	    error("Unexpected separator ""+raw[i]+"".");
	}
    }
    complete();
    }

    /**
     * Get this bag names
     * @return The name of this bag.
     */

    public String getName() {
    validate();
    return name ;
    }

    public HttpRawBag() {
    isValid	= false;
    }

    public HttpRawBag(String name) {
    this.isValid = true;
    this.name	= name ;
    }

    public HttpRawBag(boolean isValid, String name) {
    this.isValid = isValid;
    this.name	= name ;
    }