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Update RapidJsonAdapter to be compatible with both embedded and latest versions of RapidJSON

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This commit is contained in:
Tristan Penman 2015-03-23 17:01:10 +11:00
parent d538c698c9
commit 9cd913a5cd
1 changed files with 27 additions and 3 deletions
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30
include/valijson/adapters/rapidjson_adapter.hpp
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@ -219,6 +219,11 @@ class RapidJsonFrozenValue: public FrozenValue
{
public:
RapidJsonFrozenValue(const std::string &str)
{
value.SetString(str.c_str(), (unsigned int)str.length(), allocator);
}
/**
* @brief Make a copy of a RapidJson value
*
@ -757,10 +762,29 @@ inline RapidJsonObjectMemberIterator RapidJsonObject::end() const
inline RapidJsonObjectMemberIterator RapidJsonObject::find(
const std::string &propertyName) const
{
const rapidjson::Value::ConstMemberIterator
itr = value.FindMember(propertyName.c_str());
const rapidjson::Value::ConstMemberIterator foundItr =
value.FindMember(propertyName.c_str());
return itr ? itr : value.MemberEnd();
// Hack to support older versions of rapidjson that use pointers as the
// built in iterator type. In those versions, the FindMember function
// would return a null pointer when the requested member could not be
// found. After calling FindMember on an empty object, we compare the
// result against what we would expect if a non-null-pointer iterator was
// returned.
//
// Note that this value cannot be stored statically, as that would not be
// thread-safe. If there were performance measurements to justify it, this
// could be cached in the RapidJsonObject instance.
//
const rapidjson::Value empty(rapidjson::kObjectType);
const rapidjson::Value::ConstMemberIterator maybeEnd = empty.FindMember("");
if (maybeEnd != empty.MemberBegin() + 1) {
// At this point, we assume that a null pointer iterator has been
// returned by FindMember for any member that cannot be found.
return foundItr == maybeEnd ? value.MemberEnd() : foundItr;
}
return foundItr;
}
} // namespace adapters