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// Copyright (c) 2012 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 WEBKIT_DOM_STORAGE_DOM_STORAGE_MAP_H_
#define WEBKIT_DOM_STORAGE_DOM_STORAGE_MAP_H_
#pragma once
#include <map>
#include "base/memory/ref_counted.h"
#include "base/nullable_string16.h"
#include "base/string16.h"
#include "webkit/dom_storage/dom_storage_types.h"
class FilePath;
class GURL;
namespace dom_storage {
// A wrapper around a std::map that adds refcounting and
// imposes a limit on the total byte size of the keys/values.
// See class comments for DomStorageContext for a larger overview.
class DomStorageMap
: public base::RefCountedThreadSafe<DomStorageMap> {
public:
DomStorageMap();
unsigned Length() const;
NullableString16 Key(unsigned index);
NullableString16 GetItem(const string16& key) const;
bool SetItem(const string16& key, const string16& value,
NullableString16* old_value);
bool RemoveItem(const string16& key, string16* old_value);
void SwapValues(ValuesMap* map);
DomStorageMap* DeepCopy() const;
private:
friend class base::RefCountedThreadSafe<DomStorageMap>;
~DomStorageMap();
void ResetKeyIterator();
ValuesMap values_;
ValuesMap::const_iterator key_iterator_;
unsigned last_key_index_;
// TODO(benm): track usage and enforce a quota limit.
};
} // namespace dom_storage
#endif // WEBKIT_DOM_STORAGE_DOM_STORAGE_AREA_H_
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