@Override public boolean isInitialized() { for (final FieldDescriptor field : getDescriptorForType().getFields()) { // Check that all required fields are present. if (field.isRequired()) { if (!hasField(field)) { return false; } } // Check that embedded messages are initialized. if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) { if (field.isRepeated()) { @SuppressWarnings("unchecked") final List<Message> messageList = (List<Message>) getField(field); for (final Message element : messageList) { if (!element.isInitialized()) { return false; } } } else { if (hasField(field) && !((Message) getField(field)).isInitialized()) { return false; } } } } return true; }
@Override public Object getField(final FieldDescriptor field) { if (field.isExtension()) { verifyContainingType(field); final Object value = extensions.getField(field); if (value == null) { if (field.isRepeated()) { return Collections.emptyList(); } else if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) { // Lacking an ExtensionRegistry, we have no way to determine the // extension's real type, so we return a DynamicMessage. return DynamicMessage.getDefaultInstance(field.getMessageType()); } else { return field.getDefaultValue(); } } else { return value; } } else { return super.getField(field); } }