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Implementation of the Modbus protocol in Java language
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package com.intelligt.modbus.jlibmodbus.msg.base;
import com.intelligt.modbus.jlibmodbus.exception.ModbusNumberException;
import com.intelligt.modbus.jlibmodbus.net.stream.base.ModbusInputStream;
import com.intelligt.modbus.jlibmodbus.net.stream.base.ModbusOutputStream;
import com.intelligt.modbus.jlibmodbus.utils.ModbusExceptionCode;
import com.intelligt.modbus.jlibmodbus.utils.ModbusFunctionCode;
import java.io.IOException;
/*
* Copyright (C) 2016 "Invertor" Factory", JSC
* [http://www.sbp-invertor.ru]
*
* This file is part of JLibModbus.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Authors: Vladislav Y. Kochedykov, software engineer.
* email: [email protected]
*/
public abstract class ModbusResponse extends ModbusMessage {
private volatile ModbusExceptionCode modbusExceptionCode = ModbusExceptionCode.NO_EXCEPTION;
protected ModbusResponse() {
super();
}
final public boolean isException() {
return getModbusExceptionCode() != ModbusExceptionCode.NO_EXCEPTION;
}
final public void setException() {
modbusExceptionCode = ModbusExceptionCode.UNKNOWN_EXCEPTION;
}
@Override
final protected void writePDU(ModbusOutputStream fifo) throws IOException {
if (isException()) {
fifo.write(ModbusFunctionCode.getExceptionValue(getFunction()));
fifo.write(getModbusExceptionCode().getValue());
} else {
fifo.write(getFunction());
writeResponse(fifo);
}
}
@Override
final public void readPDU(ModbusInputStream fifo) throws IOException, ModbusNumberException {
if (isException()) {
setModbusExceptionCode(fifo.read());
} else {
readResponse(fifo);
}
}
abstract protected void readResponse(ModbusInputStream fifo) throws IOException, ModbusNumberException;
abstract protected void writeResponse(ModbusOutputStream fifo) throws IOException;
final public ModbusExceptionCode getModbusExceptionCode() {
return modbusExceptionCode;
}
final public void setModbusExceptionCode(int code) {
modbusExceptionCode = ModbusExceptionCode.get(code);
}
@Override
final protected int pduSize() {
return 1 + responseSize();
}
abstract protected int responseSize();
}