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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.
#ifndef CONTENT_COMMON_DOM_STORAGE_DOM_STORAGE_MAP_H_
#define CONTENT_COMMON_DOM_STORAGE_DOM_STORAGE_MAP_H_
#include <map>
#include "base/memory/ref_counted.h"
#include "base/strings/nullable_string16.h"
#include "base/strings/string16.h"
#include "content/common/content_export.h"
#include "content/common/dom_storage/dom_storage_types.h"
namespace content {
// A wrapper around a std::map that adds refcounting and
// tracks the size in bytes of the keys/values, enforcing a quota.
// See class comments for DOMStorageContextImpl for a larger overview.
class CONTENT_EXPORT DOMStorageMap
: public base::RefCountedThreadSafe<DOMStorageMap> {
public:
explicit DOMStorageMap(size_t quota);
unsigned Length() const;
base::NullableString16 Key(unsigned index);
base::NullableString16 GetItem(const base::string16& key) const;
bool SetItem(const base::string16& key, const base::string16& value,
base::NullableString16* old_value);
bool RemoveItem(const base::string16& key, base::string16* old_value);
// Swaps this instances values_ with |map|.
// Note: to grandfather in pre-existing files that are overbudget,
// this method does not do quota checking.
void SwapValues(DOMStorageValuesMap* map);
// Writes a copy of the current set of values_ to the |map|.
void ExtractValues(DOMStorageValuesMap* map) const { *map = values_; }
// Creates a new instance of DOMStorageMap containing
// a deep copy of values_.
DOMStorageMap* DeepCopy() const;
size_t bytes_used() const { return bytes_used_; }
size_t quota() const { return quota_; }
void set_quota(size_t quota) { quota_ = quota; }
static size_t CountBytes(const DOMStorageValuesMap& values);
private:
friend class base::RefCountedThreadSafe<DOMStorageMap>;
~DOMStorageMap();
void ResetKeyIterator();
DOMStorageValuesMap values_;
DOMStorageValuesMap::const_iterator key_iterator_;
unsigned last_key_index_;
size_t bytes_used_;
size_t quota_;
};
} // namespace content
#endif // CONTENT_COMMON_DOM_STORAGE_DOM_STORAGE_MAP_H_
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