@Override
public RawUnionValue decode(InputStream inStream, Context context)
throws IOException, CoderException {
int index = VarInt.decodeInt(inStream);
Object value = elementCoders.get(index).decode(inStream, context);
return new RawUnionValue(index, value);
}
/** Notifies ElementByteSizeObserver about the byte size of the encoded value using this coder. */
@Override
public void registerByteSizeObserver(
RawUnionValue union, ElementByteSizeObserver observer, Context context) throws Exception {
int index = getIndexForEncoding(union);
// Write out the union tag.
observer.update(VarInt.getLength(index));
// Write out the actual value.
@SuppressWarnings("unchecked")
Coder<Object> coder = (Coder<Object>) elementCoders.get(index);
coder.registerByteSizeObserver(union.getValue(), observer, context);
}
@SuppressWarnings("unchecked")
@Override
public void encode(RawUnionValue union, OutputStream outStream, Context context)
throws IOException, CoderException {
int index = getIndexForEncoding(union);
// Write out the union tag.
VarInt.encode(index, outStream);
// Write out the actual value.
Coder<Object> coder = (Coder<Object>) elementCoders.get(index);
coder.encode(union.getValue(), outStream, context);
}
@Override
public T decode(InputStream inStream, Context context) throws CoderException, IOException {
try {
JAXBContext jaxbContext = getContext();
// TODO: Consider caching in a ThreadLocal if this impacts performance
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
InputStream stream = inStream;
if (!context.isWholeStream) {
long limit = VarInt.decodeLong(inStream);
stream = ByteStreams.limit(inStream, limit);
}
@SuppressWarnings("unchecked")
T obj = (T) jaxbUnmarshaller.unmarshal(new CloseIgnoringInputStream(stream));
return obj;
} catch (JAXBException e) {
throw new CoderException(e);
}
}
@Override
public void encode(T value, OutputStream outStream, Context context)
throws CoderException, IOException {
try {
JAXBContext jaxbContext = getContext();
// TODO: Consider caching in a ThreadLocal if this impacts performance
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
if (!context.isWholeStream) {
try {
long size = getEncodedElementByteSize(value, Context.OUTER);
// record the number of bytes the XML consists of so when reading we only read the encoded
// value
VarInt.encode(size, outStream);
} catch (Exception e) {
throw new CoderException(
"An Exception occured while trying to get the size of an encoded representation", e);
}
}
jaxbMarshaller.marshal(value, new CloseIgnoringOutputStream(outStream));
} catch (JAXBException e) {
throw new CoderException(e);
}
}