content: package org.java_websocket;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.ByteChannel;
  
  import org.java_websocket.WebSocket.Role;
  
  public class SocketChannelIOHelper {
  
  	public static boolean read( final ByteBuffer buf, WebSocketImpl ws, ByteChannel channel ) throws IOException {
  		buf.clear();
  		int read = channel.read( buf );
  		buf.flip();
  
  		if( read == -1 ) {
  			ws.eot();
  			return false;
  		}
  		return read != 0;
  	}
  
  	/**
  	 * @see WrappedByteChannel#readMore(ByteBuffer)
  	 * @return returns whether there is more data left which can be obtained via {@link #readMore(ByteBuffer, WebSocketImpl, WrappedByteChannel)}
  	 **/
  	public static boolean readMore( final ByteBuffer buf, WebSocketImpl ws, WrappedByteChannel channel ) throws IOException {
  		buf.clear();
  		int read = channel.readMore( buf );
  		buf.flip();
  
  		if( read == -1 ) {
  			ws.eot();
  			return false;
  		}
  		return channel.isNeedRead();
  	}
  
  	/** Returns whether the whole outQueue has been flushed */
  	public static boolean batch( WebSocketImpl ws, ByteChannel sockchannel ) throws IOException {
  		ByteBuffer buffer = ws.outQueue.peek();
  		WrappedByteChannel c = null;
  
  		if( buffer == null ) {
  			if( sockchannel instanceof WrappedByteChannel ) {
  				c = (WrappedByteChannel) sockchannel;
  				if( c.isNeedWrite() ) {
  					c.writeMore();
  				}
  			}
  		} else {
  			do {// FIXME writing as much as possible is unfair!!
  				/*int written = */sockchannel.write( buffer );
  				if( buffer.remaining() > 0 ) {
  					return false;
  				} else {
  					ws.outQueue.poll(); // Buffer finished. Remove it.
  					buffer = ws.outQueue.peek();
  				}
  			} while ( buffer != null );
  		}
  
  		if( ws.outQueue.isEmpty() && ws.isFlushAndClose() && ws.getDraft().getRole() == Role.SERVER ) {//
  			synchronized ( ws ) {
  				ws.closeConnection();
  			}
  		}
  		return c != null ? !( (WrappedByteChannel) sockchannel ).isNeedWrite() : true;
  	}
  }
  