//License
/***
* Java Modbus Library (jamod)
* Copyright (c) 2002-2004, jamod development team
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of the author nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
***/
package net.wimpi.modbus.io;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.DataInput;
/**
* Interface implementing a non word data handler for the
* read/write multiple register commands (class 0).
*
* @author Dieter Wimberger
* @version 1.2rc2 (14/04/2014)
*/
public interface NonWordDataHandler {
/**
* Returns the intermediate raw non-word data.
*
* @return the raw data as <tt>byte[]</tt>.
*/
public byte[] getData();
/**
* Reads the non-word raw data based on an arbitrary
* implemented structure.
*
* @param in the <tt>DataInput</tt> to read from.
* @param reference to specify the offset as <tt>int</tt>.
* @param count to sepcify the amount of bytes as <tt>int</tt>.
*
* @throws IOException if I/O fails.
* @throws EOFException if the stream ends before all data is read.
*/
public void readData(DataInput in, int reference, int count)
throws IOException, EOFException;
/**
* Returns the word count of the data.
* Note that this should be the length of the byte
* array divided by two.
*
* @return the number of words the data consists of.
*/
public int getWordCount();
/**
* Commits the data if it has been read into an intermediate
* repository.
* This method is called by a <tt>WriteMultipleRegistersRequest</tt>
* instance when finished with reading, for creating a response.
*
* @return -1 if the commit was successful, a Modbus exception code
* valid for the read/write multiple registers commands
* otherwise.
*/
public int commitUpdate();
/**
* Prepares the raw data, putting it together from a
* backing data store.
* This method is called by a <tt>ReadMultipleRegistersRequest</tt>
* instance when finshed with reading, for creating a response.
*
* @param reference to specify the offset as <tt>int</tt>.
* @param count to sepcify the amount of bytes as <tt>int</tt>.
*/
public void prepareData(int reference, int count);
}//NonWordDataHandler