public:

~MutableDataInternal();

// Used to obtain a MutableData instance that encapsulates the data and

// priority at the given relative path.

MutableDataInternal* Child(const char* path);

// Get all the immediate children of this location.

std::vector<MutableData> GetChildren();

// Get the number of children of this location.

size_t GetChildrenCount();

// Get the key name of the source location of this data.

const char* GetKey();

// Get the key name of the source location of this data.

std::string GetKeyString();

// Get the value of the data contained at this location.

Variant GetValue() const;

// Get the priority of the data contained at this snapshot.

Variant GetPriority() const;

// Does this MutableData have data at a particular location?

bool HasChild(const char* path) const;

// Sets the data at this location to the given value.

void SetValue(Variant value);

// Sets the priority of this field, which controls its sort order relative to

// its siblings.

void SetPriority(Variant priority);

// Returns a pointer to the database this MutableData is from.

DatabaseInternal* database_internal() const { return db_; }

private:

friend class DatabaseInternal;

friend class internal::Callbacks;

static MutableData MakeMutableData(MutableDataInternal* ptr) {

return MutableData(ptr);

}

MutableDataInternal(DatabaseInternal* database, jobject mutable_data_obj);

MutableDataInternal& operator=(const MutableDataInternal&);

MutableDataInternal(MutableDataInternal&);

static bool Initialize(App* app);

static void Terminate(App* app);

DatabaseInternal* db_;

jobject obj_;

Variant cached_key_;