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// Copyright 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.
// This file provides a builders for DictionaryValue and ListValue. These
// aren't specific to extensions and could move up to base/ if there's interest
// from other sub-projects.
//
// The pattern is to write:
//
// scoped_ptr<BuiltType> result(FooBuilder()
// .Set(args)
// .Set(args)
// .Build());
//
// The Build() method invalidates its builder, and returns ownership of the
// built value.
//
// These objects are intended to be used as temporaries rather than stored
// anywhere, so the use of non-const reference parameters is likely to cause
// less confusion than usual.
#ifndef EXTENSIONS_COMMON_VALUE_BUILDER_H_
#define EXTENSIONS_COMMON_VALUE_BUILDER_H_
#include <string>
#include <utility>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string16.h"
namespace base {
class DictionaryValue;
class ListValue;
class Value;
}
namespace extensions {
class ListBuilder;
class DictionaryBuilder {
public:
DictionaryBuilder();
explicit DictionaryBuilder(const base::DictionaryValue& init);
~DictionaryBuilder();
// Can only be called once, after which it's invalid to use the builder.
scoped_ptr<base::DictionaryValue> Build() { return std::move(dict_); }
// Immediately serializes the current state to JSON. Can be called as many
// times as you like.
std::string ToJSON() const;
DictionaryBuilder& Set(const std::string& path, int in_value);
DictionaryBuilder& Set(const std::string& path, double in_value);
DictionaryBuilder& Set(const std::string& path, const std::string& in_value);
DictionaryBuilder& Set(const std::string& path,
const base::string16& in_value);
DictionaryBuilder& Set(const std::string& path,
scoped_ptr<base::Value> in_value);
// Named differently because overload resolution is too eager to
// convert implicitly to bool.
DictionaryBuilder& SetBoolean(const std::string& path, bool in_value);
private:
scoped_ptr<base::DictionaryValue> dict_;
};
class ListBuilder {
public:
ListBuilder();
explicit ListBuilder(const base::ListValue& init);
~ListBuilder();
// Can only be called once, after which it's invalid to use the builder.
scoped_ptr<base::ListValue> Build() { return std::move(list_); }
ListBuilder& Append(int in_value);
ListBuilder& Append(double in_value);
ListBuilder& Append(const std::string& in_value);
ListBuilder& Append(const base::string16& in_value);
ListBuilder& Append(scoped_ptr<base::Value> in_value);
// Named differently because overload resolution is too eager to
// convert implicitly to bool.
ListBuilder& AppendBoolean(bool in_value);
private:
scoped_ptr<base::ListValue> list_;
DISALLOW_COPY_AND_ASSIGN(ListBuilder);
};
} // namespace extensions
#endif // EXTENSIONS_COMMON_VALUE_BUILDER_H_
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