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