org.mule.transformer.simple.ByteArrayToModbusResponse.java Source code

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Here is the source code for org.mule.transformer.simple.ByteArrayToModbusResponse.java

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/*
 * Generated by the Mule project wizard. http://mule.mulesource.org
 *
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.transformer.simple;

import org.mule.transformer.AbstractTransformer;
import org.mule.api.transformer.TransformerException;
import org.apache.commons.io.output.ByteArrayOutputStream;
import net.wimpi.modbus.msg.ModbusRequest;
import net.wimpi.modbus.msg.ModbusResponse;
import net.wimpi.modbus.msg.ReadCoilsResponse;
import net.wimpi.modbus.io.BytesInputStream;
import net.wimpi.modbus.ModbusIOException;
import net.wimpi.modbus.util.ModbusUtil;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.DataInputStream;
import java.io.DataInputStream;

/**
 * org.mule.transformer.simple
 *
 * @author Christopher Cheng
 * @version $Id: Apr 23, 2009 6:07:30 PM
 */
public class ByteArrayToModbusResponse extends AbstractTransformer {
    public ByteArrayToModbusResponse() {
        registerSourceType(byte[].class);
        setReturnClass(ModbusResponse.class);
    }

    public Object doTransform(Object src, String outputEncoding) throws TransformerException {
        try {
            BytesInputStream m_ByteIn = new BytesInputStream((byte[]) src);
            DataInputStream m_Input = new DataInputStream(m_ByteIn);
            byte[] buffer = m_ByteIn.getBuffer();

            //read to byte length of message
            if (m_Input.read(buffer, 0, 6) == -1) {
                throw new ModbusIOException("Premature end of stream (Header truncated).");
            }
            //extract length of bytes following in message
            int bf = ModbusUtil.registerToShort(buffer, 4);
            //read rest
            if (m_Input.read(buffer, 6, bf) == -1) {
                throw new ModbusIOException("Premature end of stream (Message truncated).");
            }
            m_ByteIn.reset(buffer, (6 + bf));
            m_ByteIn.skip(7);
            int functionCode = m_ByteIn.readUnsignedByte();
            m_ByteIn.reset();
            ModbusResponse res = ModbusResponse.createModbusResponse(functionCode);
            res.readFrom(m_ByteIn);

            return res;
        } catch (Exception e) {
            e.printStackTrace(System.out);
            return null;
        }

    }
}