com.credibledoc.iso8583packer.ebcdic.EbcdicBodyPacker Maven / Gradle / Ivy
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package com.credibledoc.iso8583packer.ebcdic;
import com.credibledoc.iso8583packer.body.BodyPacker;
import com.credibledoc.iso8583packer.exception.PackerRuntimeException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
/**
* Implements EBCDIC {@link BodyPacker}. Strings are converted to and from EBCDIC bytes.
* The {@link #ISO_88591} charset is used.
*
* For example string 'Hello' packed to bytes as hex: C885939396.
*
* More examples
* ebcdic-body-packer.md
*
* @author Kyrylo Semenko
*/
public class EbcdicBodyPacker implements BodyPacker {
private static final Charset ISO_88591 = StandardCharsets.ISO_8859_1;
/**
* Single instance.
*/
private static final EbcdicBodyPacker instance = new EbcdicBodyPacker();
/**
* Only one instance is allowed, see the {@link #getInstance()} method.
*/
private EbcdicBodyPacker() {
// empty
}
/**
* @return The {@link #instance} singleton.
*/
public static EbcdicBodyPacker getInstance() {
return instance;
}
/**
* @param object the data to be packed. Expected String value.
* @param bytes an empty or partially filled bytes.
* @param offset the index of the first unfilled byte in the bytes array from start packing at.
*/
@Override
public void pack(Object object, byte[] bytes, int offset) {
if (object == null) {
return;
}
if (!(object instanceof String)) {
throw new PackerRuntimeException("Expected String but found " + object.getClass().getName());
}
String data = (String) object;
EbcdicService.asciiToEbcdic(data, bytes, offset);
}
/**
* @param sourceData the packed source data.
* @param offset the index in sourceData to start unpacking at.
* @param bytesCount the number of bytes to unpack.
* @return The String value
*/
@Override
@SuppressWarnings("unchecked")
public String unpack(byte[] sourceData, int offset, int bytesCount) {
int available = sourceData.length - offset;
if (bytesCount > available) {
throw new PackerRuntimeException("Available number of bytes '" + available +
"' in the sourceData[] array is less than required number of bytes '" + bytesCount +
"' in bytesCount parameter.");
}
return EbcdicService.ebcdicToAscii(sourceData, offset, bytesCount, ISO_88591);
}
/**
* @param object the String for packing.
* @return The String length.
*/
@Override
public int getPackedLength(Object object) {
if (object == null) {
return 0;
}
if (!(object instanceof String)) {
throw new PackerRuntimeException("Expected String but found " + object.getClass().getName());
}
String string = (String) object;
return string.length();
}
}