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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 CHROME_BROWSER_EXTENSIONS_API_STORAGE_POLICY_VALUE_STORE_H_
#define CHROME_BROWSER_EXTENSIONS_API_STORAGE_POLICY_VALUE_STORE_H_
#include <string>
#include <vector>
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "extensions/browser/api/storage/settings_observer.h"
#include "extensions/browser/value_store/value_store.h"
namespace policy {
class PolicyMap;
}
namespace extensions {
// A ValueStore that is backed by another, persistent ValueStore, and stores
// the policies for a specific extension there. This ValueStore is used to
// run the function of the storage.managed namespace; it's read-only for the
// extension. The ManagedValueStoreCache sends updated policy to this store
// and manages its lifetime.
class PolicyValueStore : public ValueStore {
public:
PolicyValueStore(const std::string& extension_id,
const scoped_refptr<SettingsObserverList>& observers,
scoped_ptr<ValueStore> delegate);
virtual ~PolicyValueStore();
// Stores |policy| in the persistent database represented by the |delegate_|
// and notifies observers with the changes from the previous policy.
void SetCurrentPolicy(const policy::PolicyMap& policy);
// Clears all the stored data and deletes the database.
void DeleteStorage();
// ValueStore implementation:
virtual size_t GetBytesInUse(const std::string& key) OVERRIDE;
virtual size_t GetBytesInUse(const std::vector<std::string>& keys) OVERRIDE;
virtual size_t GetBytesInUse() OVERRIDE;
virtual ReadResult Get(const std::string& key) OVERRIDE;
virtual ReadResult Get(const std::vector<std::string>& keys) OVERRIDE;
virtual ReadResult Get() OVERRIDE;
virtual WriteResult Set(
WriteOptions options,
const std::string& key,
const base::Value& value) OVERRIDE;
virtual WriteResult Set(
WriteOptions options, const base::DictionaryValue& values) OVERRIDE;
virtual WriteResult Remove(const std::string& key) OVERRIDE;
virtual WriteResult Remove(const std::vector<std::string>& keys) OVERRIDE;
virtual WriteResult Clear() OVERRIDE;
// Hopefully, as a Read-Only database, there is no reason to use these.
virtual bool Restore() OVERRIDE;
virtual bool RestoreKey(const std::string& key) OVERRIDE;
// For unit tests.
ValueStore* delegate() { return delegate_.get(); }
private:
std::string extension_id_;
scoped_refptr<SettingsObserverList> observers_;
scoped_ptr<ValueStore> delegate_;
DISALLOW_COPY_AND_ASSIGN(PolicyValueStore);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_STORAGE_POLICY_VALUE_STORE_H_
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