/**
* 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);
}
/**
* Useful for implementing {@link
* Message.Builder#setRepeatedField(Descriptors.FieldDescriptor,int,Object)}.
*/
@SuppressWarnings("unchecked")
public void setRepeatedField(
final FieldDescriptorType descriptor, final int index, final Object value) {
if (!descriptor.isRepeated()) {
throw new IllegalArgumentException(
"getRepeatedField() can only be called on repeated fields.");
}
final Object list = fields.get(descriptor);
if (list == null) {
throw new IndexOutOfBoundsException();
}
verifyType(descriptor.getLiteType(), value);
((List) list).set(index, value);
}
/**
* 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);
}