private boolean isDataEnd()
		{
			String flag = buffer.substring( buffer.lastIndexOf( "\n" ) + 1,
					buffer.length() );
			int indexLeft = flag.lastIndexOf( "[" );
			int indexRight = flag.lastIndexOf( "@" );
			if ( indexLeft == -1 || indexRight == -1 || indexLeft > indexRight )
			{
				return false;
			}
			if ( flag.substring( indexLeft, indexRight )
					.equals( "[" + username ) )
			{
				return true;
			}
			return false;
		}