/** Create a nice readable message for errors */
private String makeExceptionMessage(IField<?> c, String operation) {
Object fieldKey = "unknown";
if (c != null) {
try {
fieldKey = new Integer(c.getFieldNumber());
} catch (Exception ignore) {
}
}
return getClass().getName() + ": Problem " + operation + " field " + fieldKey;
}
/** Convert the component into a byte[]. */
public byte[] pack(IField<?> c) throws MessageException {
try {
byte[] data = (byte[]) c.getValue();
int packedLength = prefixer.getPackedLength();
if (packedLength == 0) {
if (data.length != getLength()) {
throw new MessageException(
"Binary data length not the same as the packager length ("
+ data.length
+ "/"
+ getLength()
+ ")");
}
}
byte[] ret = new byte[interpreter.getPackedLength(data.length) + packedLength];
prefixer.encodeLength(data.length, ret);
interpreter.interpret(data, ret, packedLength);
return ret;
} catch (Exception e) {
throw new MessageException(makeExceptionMessage(c, "packing"), e);
}
}