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CopyBook serializer and deserializer for Java where CopyBook lines are used to annotate a normal Java class
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/*
* Copyright (c) 2015. Troels Liebe Bentsen
* Licensed under the MIT license (LICENSE.txt)
*/
package dk.nversion.copybook.converters;
import dk.nversion.ByteUtils;
import dk.nversion.copybook.exceptions.TypeConverterException;
import dk.nversion.copybook.serializers.CopyBookFieldSigningType;
import java.util.Arrays;
public class SignedIntegerToInteger extends TypeConverterBase {
@Override
public void validate(Class type, int size, int decimals) {
if(size > 10 && (this.signingType == CopyBookFieldSigningType.PREFIX || this.signingType == CopyBookFieldSigningType.POSTFIX)) {
throw new TypeConverterException("int is not large enough to hold possible value");
}
if(size > 9 && (this.signingType == CopyBookFieldSigningType.LAST_BYTE_BIT8 || this.signingType == CopyBookFieldSigningType.LAST_BYTE_EBCDIC_BIT5)) {
throw new TypeConverterException("int is not large enough to hold possible value");
}
if(!(Integer.class.equals(type) || Integer.TYPE.equals(type))) {
throw new TypeConverterException("Only supports converting to and from int or Integer");
}
}
@Override
public Object to(byte[] bytes, int offset, int length, int decimals, boolean removePadding) {
if(this.defaultValue != null && ByteUtils.allEquals(bytes, this.nullFillerByte, offset, bytes.length)) { // All of value is null filler
return Integer.parseInt(defaultValue);
} else {
return Integer.parseInt(getSignedIntegerString(bytes, offset, length, removePadding));
}
}
@Override
public byte[] from(Object value, int length, int decimals, boolean addPadding) {
if(value == null && this.defaultValue == null) {
return null;
}
int i = value != null ? (int) value : Integer.parseInt(this.defaultValue);
byte[] strBytes = getSignedBytes(Integer.toString(Math.abs(i)), i < 0);
if(strBytes.length > length) {
throw new TypeConverterException("Field to small for value: " + length + " < " + strBytes.length);
}
if(addPadding) {
strBytes = padBytes(strBytes, length);
}
return strBytes;
}
protected String getSignedIntegerString(byte[] bytes, int offset, int length, boolean removePadding) {
String strValue;
if(this.signingType == CopyBookFieldSigningType.POSTFIX) {
strValue = normalizeNumericSigning(getString(bytes, offset, length, removePadding, 2), true);
} else if(this.signingType == CopyBookFieldSigningType.PREFIX) {
strValue = normalizeNumericSigning(getString(bytes, offset, length, removePadding, 2), false);
} else if (signingType == CopyBookFieldSigningType.LAST_BYTE_BIT8) {
if ((bytes[bytes.length - 1] & 128) != 0) { // Check if bit 8 is set
byte[] bytesCopy = Arrays.copyOf(bytes, bytes.length);
bytesCopy[bytesCopy.length - 1] = (byte) (bytesCopy[bytesCopy.length - 1] & 127);
strValue = "-" + getString(bytesCopy, 0, bytesCopy.length, removePadding, 1);
} else {
strValue = getString(bytes, offset, length, removePadding, 1);;
}
} else if (signingType == CopyBookFieldSigningType.LAST_BYTE_EBCDIC_BIT5) {
byte res = (byte)(bytes[bytes.length -1] & 240); // Read last byte and zero first 4 bits of the result, 11110000
byte[] bytesCopy = Arrays.copyOf(bytes, bytes.length - 1);
if((byte)(res ^ 208) == 0 ||(byte)(res ^ 176) == 0) { // 208 = 11010000, 176 = 10110000
strValue = "-" + getString(bytesCopy, offset, length -1, removePadding, 1) + String.valueOf(bytes[bytes.length -1] & 15);
} else {
strValue = getString(bytesCopy, offset, bytesCopy.length, removePadding, 1) + String.valueOf(bytes[bytes.length -1] & 15);
}
} else {
throw new TypeConverterException("Unknown signing type");
}
return strValue;
}
protected byte[] getSignedBytes(String strValue, boolean negative) {
byte[] strBytes;
if (this.signingType == CopyBookFieldSigningType.POSTFIX) {
strBytes = (strValue + (negative ? '-' : "+")).getBytes(this.charset);
} else if (signingType == CopyBookFieldSigningType.PREFIX) {
strBytes = ((negative ? '-' : "+") + strValue).getBytes(this.charset);
} else if (signingType == CopyBookFieldSigningType.LAST_BYTE_BIT8) {
strBytes = strValue.getBytes(charset);
if(negative) {
strBytes[strBytes.length -1] = (byte)(strBytes[strBytes.length -1] | 128); // Set bit 8
} else {
strBytes[strBytes.length -1] = (byte)(strBytes[strBytes.length -1] & 127); // Unset bit 8
}
} else if (signingType == CopyBookFieldSigningType.LAST_BYTE_EBCDIC_BIT5) {
strBytes = strValue.getBytes(charset);
strBytes[strBytes.length -1] = (byte)(strBytes[strBytes.length -1] & 15); // zero top 4 bits, 00001111
if(negative) {
strBytes[strBytes.length -1] = (byte)(strBytes[strBytes.length -1] | 208); // Set bits 1101 0000
} else {
strBytes[strBytes.length -1] = (byte)(strBytes[strBytes.length -1] | 192); // Set bits 1100 0000
}
} else {
throw new TypeConverterException("Unknown signing type");
}
//String test = debugBitmap(strBytes, strBytes.length -1, 1);
return strBytes;
}
private String normalizeNumericSigning(String str, boolean signingPostfix) {
if (signingPostfix) {
if (str.endsWith("-")) {
str = '-' + str.substring(0, str.length() - 1);
} else if (str.endsWith("+")) {
str = str.substring(0, str.length() - 1);
} else {
throw new TypeConverterException("Missing sign char for value '" + str + "'");
}
} else {
if (str.startsWith("+")) {
str = str.substring(1, str.length());
} else if (str.startsWith("-")) {
// DO nothing
} else {
throw new TypeConverterException("Missing sign char for value '" + str + "'");
}
}
return str;
}
private String debugBitmap(byte[] bytes, int index, int length) {
String result = "";
for(int i = index; i < length; i++) {
result += ("0000000" + Integer.toBinaryString(bytes[i] & 0xFF)).replaceAll(".*(.{8})$", "$1");
}
return result;
}
}