src/google/protobuf/any.cc

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
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//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
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// in the documentation and/or other materials provided with the
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#include <google/protobuf/any.h>

namespace google {
namespace protobuf {
namespace internal {

namespace {
string GetTypeUrl(const Descriptor* message) {
  return string(kTypeGoogleApisComPrefix) + message->full_name();
}

}  // namespace

const char kAnyFullTypeName[] = "google.protobuf.Any";
const char kTypeGoogleApisComPrefix[] = "type.googleapis.com/";
const char kTypeGoogleProdComPrefix[] = "type.googleprod.com/";

AnyMetadata::AnyMetadata(UrlType* type_url, ValueType* value)
    : type_url_(type_url), value_(value) {
}

void AnyMetadata::PackFrom(const Message& message) {
  type_url_->SetNoArena(&::google::protobuf::internal::GetEmptyString(),
                        GetTypeUrl(message.GetDescriptor()));
  message.SerializeToString(value_->MutableNoArena(
      &::google::protobuf::internal::GetEmptyStringAlreadyInited()));
}

bool AnyMetadata::UnpackTo(Message* message) const {
  if (!InternalIs(message->GetDescriptor())) {
    return false;
  }
  return message->ParseFromString(
      value_->GetNoArena(&::google::protobuf::internal::GetEmptyString()));
}

bool AnyMetadata::InternalIs(const Descriptor* descriptor) const {
  return type_url_->GetNoArena(
             &::google::protobuf::internal::GetEmptyString()) ==
         GetTypeUrl(descriptor);
}

bool ParseAnyTypeUrl(const string& type_url, string* full_type_name) {
  static const char* prefix[] = {
    kTypeGoogleApisComPrefix,
    kTypeGoogleProdComPrefix
  };
  for (int i = 0; i < 2; i++) {
    const int prefix_len = strlen(prefix[i]);
    if (strncmp(type_url.c_str(), prefix[i], prefix_len) == 0) {
      full_type_name->assign(type_url.data() + prefix_len,
                             type_url.size() - prefix_len);
      return true;
    }
  }
  return false;
}


bool GetAnyFieldDescriptors(const Message& message,
                            const FieldDescriptor** type_url_field,
                            const FieldDescriptor** value_field) {
    const Descriptor* descriptor = message.GetDescriptor();
    if (descriptor->full_name() != kAnyFullTypeName) {
      return false;
    }
    *type_url_field = descriptor->FindFieldByNumber(1);
    *value_field = descriptor->FindFieldByNumber(2);
    return (*type_url_field != NULL &&
            (*type_url_field)->type() == FieldDescriptor::TYPE_STRING &&
            *value_field != NULL &&
            (*value_field)->type() == FieldDescriptor::TYPE_BYTES);
}

}  // namespace internal
}  // namespace protobuf
}  // namespace google