/*
 * (c) Copyright 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See endLog of file]
 */

package riot.comms;

import java.io.UnsupportedEncodingException ;
import java.util.List ;

import org.openjena.riot.tokens.Token ;
import org.openjena.riot.tokens.TokenType ;
import org.openjena.riot.tokens.TokenizerText ;


public class TokenComms
{
    public static final char endSectionMarker = 'Z' ;
    public static final char  endStreamMarker = 'Y' ;
    
    public static byte[] endSectionMarkerBytes ;
    public static  byte[] endStreamMarkerBytes  ;

    
    static
    {
        try
        {
            endSectionMarkerBytes = cntrlAsString(endSectionMarker).getBytes("ASCII") ;
            endStreamMarkerBytes = cntrlAsString(endStreamMarker).getBytes("ASCII") ;
        } catch (UnsupportedEncodingException ex)
        {   // ASCII is required
            throw new Error("ASCII encoding does nto work") ;
        }
    }
    
    //public static final String endMarkerStr = cntrlAsString(endMarker) ;

    public static String cntrlAsString(char cntrl)
    {
        return 
            Character.toString((char)TokenizerText.CTRL_CHAR)+Character.toString(cntrl);
    }
    
//    public static void sendEndMarker(TupleOutputStream output)
//    {
//        output.sendControl(endMarker) ;
////        output.startTuple() ;
////        output.sendString(endMarkerStr) ;
////        output.endTuple() ;
//    }
    
    public static boolean isEndSectionMarker(List<Token> tuple)
    {
        return isControl(tuple, endSectionMarker) ;
    }
    
    public static boolean isEndStreamMarker(List<Token> tuple)
    {
        return isControl(tuple, endStreamMarker) ;
    }
    
    public static boolean isControl(List<Token> tuple, int ctlCode)
    {
        if ( tuple.size() != 1 ) return false ; 
        if ( ! tuple.get(0).hasType(TokenType.CNTRL) )
            return false ;
        int x = tuple.get(0).getCntrlCode() ;
        if ( x == ctlCode )
            return true ; 
        return false ;
    }

}

/*
 * (c) Copyright 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */