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package com.sun.grizzly.util;

import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
/**
 * Generic parsing interface that can be used to implement protocol
 * specific logic parsing.
 *
 * @deprecated Use the ProtocolParser instead.
 * 
 * @author Jean-Francois Arcand
 */
public interface StreamAlgorithm{
    
    
    /**
     * Return the stream content-length. If the content-length wasn't parsed,
     * return -1.
     * @return  content length or -1 if content length was not parsed
     */
    public int contentLength();
    
    
    /**
     * Return the stream header length. The header length is the length between
     * the start of the stream and the first occurance of character '\r\n' .
     * @return  header length
     */
    public int headerLength();
    
    
    /**
     * Allocate a {@link ByteBuffer}
     * @param useDirect allocate a direct {@link ByteBuffer}.
     * @param useView allocate a view {@link ByteBuffer}.
     * @param size the size of the newly created {@link ByteBuffer}.
     * @return a new {@link ByteBuffer}
     */
    public ByteBuffer allocate(boolean useDirect, boolean useView, int size);
    
    
    /**
     * Before parsing the bytes, initialize and prepare the algorithm.
     * @param byteBuffer the {@link ByteBuffer} used by this algorithm
     * @return {@link ByteBuffer} used by this algorithm
     */
    public ByteBuffer preParse(ByteBuffer byteBuffer);
    
    
    /**
     * Parse the {@link ByteBuffer} and try to determine if the bytes
     * stream has been fully read from the {@link SocketChannel}.
     * @param byteBuffer the bytes read.
     * @return true if the algorithm determines the end of the stream.
     */
    public boolean parse(ByteBuffer byteBuffer);
    
    
    /**
     * After parsing the bytes, post process the {@link ByteBuffer} 
     * @param byteBuffer the {@link ByteBuffer} used by this algorithm
     * @return {@link ByteBuffer} used by this algorithm
     */
    public ByteBuffer postParse(ByteBuffer byteBuffer);  
    
    
    /**
     * Recycle the algorithm.
     */
    public void recycle();
    
    
    /**
     * Rollback the {@link ByteBuffer} to its previous state in case
     * an error as occured.
     * @param byteBuffer
     * @return  {@link ByteBuffer}
     */
    public ByteBuffer rollbackParseState(ByteBuffer byteBuffer);  
    
    
    /**
     * The {@link Interceptor} associated with this algorithm.
     * @return {@link Interceptor}
     */
    public Interceptor getHandler();

    
    /**
     * Set the {@link Channel} used by this algorithm
     * @param channek set {@link Channel}
     */
    public void setChannel(E channel);
    
    
    /**
     * Set the port this algorithm is used.
     * @param port  port number
     */
    public void setPort(int port);
    
    
    /**
     * Return the port
     * @return  port number being used
     */
    public int getPort();

}