/** Write a single field. */
public static void writeField(
final FieldDescriptorLite<?> descriptor, final Object value, final CodedOutputStream output)
throws IOException {
WireFormat.FieldType type = descriptor.getLiteType();
int number = descriptor.getNumber();
if (descriptor.isRepeated()) {
final List<?> valueList = (List<?>) value;
if (descriptor.isPacked()) {
output.writeTag(number, WireFormat.WIRETYPE_LENGTH_DELIMITED);
// Compute the total data size so the length can be written.
int dataSize = 0;
for (final Object element : valueList) {
dataSize += computeElementSizeNoTag(type, element);
}
output.writeRawVarint32(dataSize);
// Write the data itself, without any tags.
for (final Object element : valueList) {
writeElementNoTag(output, type, element);
}
} else {
for (final Object element : valueList) {
writeElement(output, type, number, element);
}
}
} else {
writeElement(output, type, number, value);
}
}
/** Compute the number of bytes needed to encode a particular field. */
public static int computeFieldSize(final FieldDescriptorLite<?> descriptor, final Object value) {
WireFormat.FieldType type = descriptor.getLiteType();
int number = descriptor.getNumber();
if (descriptor.isRepeated()) {
if (descriptor.isPacked()) {
int dataSize = 0;
for (final Object element : (List<?>) value) {
dataSize += computeElementSizeNoTag(type, element);
}
return dataSize
+ CodedOutputStream.computeTagSize(number)
+ CodedOutputStream.computeRawVarint32Size(dataSize);
} else {
int size = 0;
for (final Object element : (List<?>) value) {
size += computeElementSize(type, number, element);
}
return size;
}
} else {
return computeElementSize(type, number, value);
}
}
