io.debezium.ibmi.db2.journal.retrieve.rjne0200.ReceiverNameDecoder Maven / Gradle / Ivy

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/*
 * Copyright Debezium Authors.
 *
 * Licensed under the Apache Software License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
 */
package io.debezium.ibmi.db2.journal.retrieve.rjne0200;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.ibm.as400.access.AS400Bin2;
import com.ibm.as400.access.AS400DataType;
import com.ibm.as400.access.AS400Structure;
import com.ibm.as400.access.AS400Text;
import com.ibm.as400.access.AS400Timestamp;
import com.ibm.as400.access.BinaryFieldDescription;
import com.ibm.as400.access.CharacterFieldDescription;
import com.ibm.as400.access.FieldDescription;

public class ReceiverNameDecoder {
    private static final Logger log = LoggerFactory.getLogger(ReceiverNameDecoder.class);

    private final static AS400Structure structure;

    static {
        ArrayList dataTypes = new ArrayList();
        AS400Timestamp timeType = new AS400Timestamp();
        try {
            Field privateDTSFormat = AS400Timestamp.class.getDeclaredField("FORMAT_DTS");
            privateDTSFormat.setAccessible(true);
            int dtsformat = (int) privateDTSFormat.get(timeType);
            Method privateSetFormat = AS400Timestamp.class.getDeclaredMethod("setFormat", int.class);
            privateSetFormat.setAccessible(true);
            privateSetFormat.invoke(timeType, dtsformat);
        }
        catch (Exception e) {
            log.error("failed setting up date formatting", e);
        }

        FieldDescription[] fds = new FieldDescription[]{
                new CharacterFieldDescription(new AS400Text(10), "0 receiver name"),
                new CharacterFieldDescription(new AS400Text(10), "1 library name"),
                new CharacterFieldDescription(new AS400Text(10), "2 ASP device name"),
                new BinaryFieldDescription(new AS400Bin2(), "3 ASP number") };
        for (int i = 0; i < fds.length; i++) {
            dataTypes.add(fds[i].getDataType());
        }
        structure = new AS400Structure(dataTypes.toArray(new AS400DataType[dataTypes.size()]));
    }

    public String[] decode(byte[] data, int offset) {
        Object[] os = (Object[]) structure.toObject(data, offset);
        String receiver = (String) os[0];
        String library = (String) os[1];
        return new String[]{ receiver, library };
    }

}