com.google.protobuf.ExtensionRegistry.ExtensionInfo#com.fasterxml.jackson.databind.PropertyNamingStrategy.PropertyNamingStrategyBase源码实例Demo

public PropertyNamingStrategyWrapper(PropertyNamingStrategy delegate) {
  if (delegate instanceof PropertyNamingStrategyBase) {
    this.delegate = (PropertyNamingStrategyBase) delegate;
  } else if (delegate == PropertyNamingStrategy.LOWER_CAMEL_CASE) {
    this.delegate = NO_OP;
  } else {
    this.delegate = SNAKE_TO_CAMEL;
  }
}
 

private Map<String, ExtensionInfo> buildExtensionLookup(Descriptor descriptor, DeserializationContext context) {
  PropertyNamingStrategyBase namingStrategy =
          new PropertyNamingStrategyWrapper(context.getConfig().getPropertyNamingStrategy());

  Map<String, ExtensionInfo> extensionLookup = new HashMap<>();
  for (ExtensionInfo extensionInfo : config.extensionRegistry().getExtensionsByDescriptor(descriptor)) {
    extensionLookup.put(namingStrategy.translate(extensionInfo.descriptor.getName()), extensionInfo);
  }

  return extensionLookup;
}
 

@Override
public void serialize(
        MessageOrBuilder message,
        JsonGenerator generator,
        SerializerProvider serializerProvider
) throws IOException {
  generator.writeStartObject();

  boolean proto3 = message.getDescriptorForType().getFile().getSyntax() == Syntax.PROTO3;
  Include include = serializerProvider.getConfig().getDefaultPropertyInclusion().getValueInclusion();
  boolean writeDefaultValues = proto3 && include != Include.NON_DEFAULT;
  boolean writeEmptyCollections = include != Include.NON_DEFAULT && include != Include.NON_EMPTY;
  PropertyNamingStrategyBase namingStrategy =
          new PropertyNamingStrategyWrapper(serializerProvider.getConfig().getPropertyNamingStrategy());

  Descriptor descriptor = message.getDescriptorForType();
  List<FieldDescriptor> fields = new ArrayList<>(descriptor.getFields());
  if (message instanceof ExtendableMessageOrBuilder<?>) {
    for (ExtensionInfo extensionInfo : config.extensionRegistry().getExtensionsByDescriptor(descriptor)) {
      fields.add(extensionInfo.descriptor);
    }
  }

  for (FieldDescriptor field : fields) {
    if (field.isRepeated()) {
      List<?> valueList = (List<?>) message.getField(field);

      if (!valueList.isEmpty() || writeEmptyCollections) {
        if (field.isMapField()) {
          generator.writeFieldName(namingStrategy.translate(field.getName()));
          writeMap(field, valueList, generator, serializerProvider);
        } else if (valueList.size() == 1 && writeSingleElementArraysUnwrapped(serializerProvider)) {
          generator.writeFieldName(namingStrategy.translate(field.getName()));
          writeValue(field, valueList.get(0), generator, serializerProvider);
        } else {
          generator.writeArrayFieldStart(namingStrategy.translate(field.getName()));
          for (Object subValue : valueList) {
            writeValue(field, subValue, generator, serializerProvider);
          }
          generator.writeEndArray();
        }
      }
    } else if (message.hasField(field) || (writeDefaultValues && !supportsFieldPresence(field) && field.getContainingOneof() == null)) {
      generator.writeFieldName(namingStrategy.translate(field.getName()));
      writeValue(field, message.getField(field), generator, serializerProvider);
    } else if (include == Include.ALWAYS && field.getContainingOneof() == null) {
      generator.writeFieldName(namingStrategy.translate(field.getName()));
      generator.writeNull();
    }
  }

  generator.writeEndObject();
}