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      1 // Protocol Buffers - Google's data interchange format
      2 // Copyright 2008 Google Inc.  All rights reserved.
      3 // https://developers.google.com/protocol-buffers/
      4 //
      5 // Redistribution and use in source and binary forms, with or without
      6 // modification, are permitted provided that the following conditions are
      7 // met:
      8 //
      9 //     * Redistributions of source code must retain the above copyright
     10 // notice, this list of conditions and the following disclaimer.
     11 //     * Redistributions in binary form must reproduce the above
     12 // copyright notice, this list of conditions and the following disclaimer
     13 // in the documentation and/or other materials provided with the
     14 // distribution.
     15 //     * Neither the name of Google Inc. nor the names of its
     16 // contributors may be used to endorse or promote products derived from
     17 // this software without specific prior written permission.
     18 //
     19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30 
     31 #include <google/protobuf/any.h>
     32 
     33 namespace google {
     34 namespace protobuf {
     35 namespace internal {
     36 
     37 namespace {
     38 string GetTypeUrl(const Descriptor* message,
     39                   const string& type_url_prefix) {
     40   if (!type_url_prefix.empty() &&
     41       type_url_prefix[type_url_prefix.size() - 1] == '/') {
     42     return type_url_prefix + message->full_name();
     43   } else {
     44     return type_url_prefix + "/" + message->full_name();
     45   }
     46 }
     47 }  // namespace
     48 
     49 const char kAnyFullTypeName[] = "google.protobuf.Any";
     50 const char kTypeGoogleApisComPrefix[] = "type.googleapis.com/";
     51 const char kTypeGoogleProdComPrefix[] = "type.googleprod.com/";
     52 
     53 AnyMetadata::AnyMetadata(UrlType* type_url, ValueType* value)
     54     : type_url_(type_url), value_(value) {
     55 }
     56 
     57 void AnyMetadata::PackFrom(const Message& message) {
     58   PackFrom(message, kTypeGoogleApisComPrefix);
     59 }
     60 
     61 void AnyMetadata::PackFrom(const Message& message,
     62                            const string& type_url_prefix) {
     63   type_url_->SetNoArena(&::google::protobuf::internal::GetEmptyString(),
     64                         GetTypeUrl(message.GetDescriptor(), type_url_prefix));
     65   message.SerializeToString(value_->MutableNoArena(
     66       &::google::protobuf::internal::GetEmptyStringAlreadyInited()));
     67 }
     68 
     69 bool AnyMetadata::UnpackTo(Message* message) const {
     70   if (!InternalIs(message->GetDescriptor())) {
     71     return false;
     72   }
     73   return message->ParseFromString(
     74       value_->GetNoArena(&::google::protobuf::internal::GetEmptyString()));
     75 }
     76 
     77 bool AnyMetadata::InternalIs(const Descriptor* descriptor) const {
     78   const string type_url = type_url_->GetNoArena(
     79              &::google::protobuf::internal::GetEmptyString());
     80   string full_name;
     81   if (!ParseAnyTypeUrl(type_url, &full_name)) {
     82     return false;
     83   }
     84   return full_name == descriptor->full_name();
     85 }
     86 
     87 bool ParseAnyTypeUrl(const string& type_url, string* full_type_name) {
     88   size_t pos = type_url.find_last_of("/");
     89   if (pos == string::npos || pos + 1 == type_url.size()) {
     90     return false;
     91   }
     92   *full_type_name = type_url.substr(pos + 1);
     93   return true;
     94 }
     95 
     96 
     97 bool GetAnyFieldDescriptors(const Message& message,
     98                             const FieldDescriptor** type_url_field,
     99                             const FieldDescriptor** value_field) {
    100     const Descriptor* descriptor = message.GetDescriptor();
    101     if (descriptor->full_name() != kAnyFullTypeName) {
    102       return false;
    103     }
    104     *type_url_field = descriptor->FindFieldByNumber(1);
    105     *value_field = descriptor->FindFieldByNumber(2);
    106     return (*type_url_field != NULL &&
    107             (*type_url_field)->type() == FieldDescriptor::TYPE_STRING &&
    108             *value_field != NULL &&
    109             (*value_field)->type() == FieldDescriptor::TYPE_BYTES);
    110 }
    111 
    112 }  // namespace internal
    113 }  // namespace protobuf
    114 }  // namespace google
    115