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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_CPP_EXTENSIONS_DICT_FIELD_H_
#define PPAPI_CPP_EXTENSIONS_DICT_FIELD_H_
#include <string>
#include "ppapi/c/pp_bool.h"
#include "ppapi/cpp/extensions/from_var_converter.h"
#include "ppapi/cpp/extensions/optional.h"
#include "ppapi/cpp/extensions/to_var_converter.h"
#include "ppapi/cpp/var.h"
#include "ppapi/cpp/var_dictionary.h"
namespace pp {
namespace ext {
template <class T>
class DictField {
public:
explicit DictField(const std::string& key) : key_(key), value_() {
}
~DictField() {
}
const std::string& key() const { return key_; }
// Returns the value.
T& operator()() { return value_; }
const T& operator()() const { return value_; }
// Adds this field to the dictionary var.
bool AddTo(VarDictionary* dict) const {
if (!dict)
return false;
internal::ToVarConverter<T> converter(value_);
return dict->Set(Var(key_), converter.var());
}
bool Populate(const VarDictionary& dict) {
Var value_var = dict.Get(Var(key_));
if (value_var.is_undefined())
return false;
internal::FromVarConverter<T> converter(value_var.pp_var());
value_ = converter.value();
return true;
}
private:
std::string key_;
T value_;
};
template <class T>
class OptionalDictField {
public:
explicit OptionalDictField(const std::string& key) : key_(key) {
}
~OptionalDictField() {
}
const std::string& key() const { return key_; }
// Returns the value.
Optional<T>& operator()() { return value_; }
const Optional<T>& operator()() const { return value_; }
// Adds this field to the dictionary var, if |value| has been set.
bool MayAddTo(VarDictionary* dict) const {
if (!dict)
return false;
if (!value_.IsSet())
return true;
internal::ToVarConverter<T> converter(*value_);
return dict->Set(Var(key_), converter.var());
}
bool Populate(const VarDictionary& dict) {
Var value_var = dict.Get(Var(key_));
internal::FromVarConverter<Optional<T> > converter(value_var.pp_var());
value_.Swap(&converter.value());
return true;
}
private:
std::string key_;
Optional<T> value_;
};
} // namespace ext
} // namespace pp
#endif // PPAPI_CPP_EXTENSIONS_DICT_FIELD_H_
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