@SuppressWarnings("unchecked")
private void mergeFromField(final Map.Entry<FieldDescriptorType, Object> entry) {
final FieldDescriptorType descriptor = entry.getKey();
final Object otherValue = entry.getValue();
if (descriptor.isRepeated()) {
Object value = fields.get(descriptor);
if (value == null) {
// Our list is empty, but we still need to make a defensive copy of
// the other list since we don't know if the other FieldSet is still
// mutable.
fields.put(descriptor, new ArrayList((List) otherValue));
} else {
// Concatenate the lists.
((List) value).addAll((List) otherValue);
}
} else if (descriptor.getLiteJavaType() == WireFormat.JavaType.MESSAGE) {
Object value = fields.get(descriptor);
if (value == null) {
fields.put(descriptor, otherValue);
} else {
// Merge the messages.
fields.put(
descriptor,
descriptor
.internalMergeFrom(((MessageLite) value).toBuilder(), (MessageLite) otherValue)
.build());
}
} else {
fields.put(descriptor, otherValue);
}
}
/**
* Useful for implementing {@link
* Message.Builder#addRepeatedField(Descriptors.FieldDescriptor,Object)}.
*/
@SuppressWarnings("unchecked")
public void addRepeatedField(final FieldDescriptorType descriptor, final Object value) {
if (!descriptor.isRepeated()) {
throw new IllegalArgumentException(
"addRepeatedField() can only be called on repeated fields.");
}
verifyType(descriptor.getLiteType(), value);
final Object existingValue = fields.get(descriptor);
List list;
if (existingValue == null) {
list = new ArrayList();
fields.put(descriptor, list);
} else {
list = (List) existingValue;
}
list.add(value);
}
/**
* Useful for implementing {@link Message.Builder#setField(Descriptors.FieldDescriptor,Object)}.
*/
@SuppressWarnings("unchecked")
public void setField(final FieldDescriptorType descriptor, Object value) {
if (descriptor.isRepeated()) {
if (!(value instanceof List)) {
throw new IllegalArgumentException(
"Wrong object type used with protocol message reflection.");
}
// Wrap the contents in a new list so that the caller cannot change
// the list's contents after setting it.
final List newList = new ArrayList();
newList.addAll((List) value);
for (final Object element : newList) {
verifyType(descriptor.getLiteType(), element);
}
value = newList;
} else {
verifyType(descriptor.getLiteType(), value);
}
fields.put(descriptor, value);
}