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// Copyright 2014 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 BASE_PREFS_WRITEABLE_PREF_STORE_H_
#define BASE_PREFS_WRITEABLE_PREF_STORE_H_
#include <string>
#include "base/basictypes.h"
#include "base/prefs/pref_store.h"
namespace base {
class Value;
}
// A pref store that can be written to as well as read from.
class BASE_PREFS_EXPORT WriteablePrefStore : public PrefStore {
public:
WriteablePrefStore() {}
// Sets a |value| for |key| in the store. Assumes ownership of |value|, which
// must be non-NULL.
virtual void SetValue(const std::string& key, base::Value* value) = 0;
// Removes the value for |key|.
virtual void RemoveValue(const std::string& key) = 0;
// Equivalent to PrefStore::GetValue but returns a mutable value.
virtual bool GetMutableValue(const std::string& key,
base::Value** result) = 0;
// Triggers a value changed notification. This function needs to be called
// if one retrieves a list or dictionary with GetMutableValue and change its
// value. SetValue takes care of notifications itself. Note that
// ReportValueChanged will trigger notifications even if nothing has changed.
virtual void ReportValueChanged(const std::string& key) = 0;
// Same as SetValue, but doesn't generate notifications. This is used by
// PrefService::GetMutableUserPref() in order to put empty entries
// into the user pref store. Using SetValue is not an option since existing
// tests rely on the number of notifications generated.
virtual void SetValueSilently(const std::string& key, base::Value* value) = 0;
protected:
~WriteablePrefStore() override {}
private:
DISALLOW_COPY_AND_ASSIGN(WriteablePrefStore);
};
#endif // BASE_PREFS_WRITEABLE_PREF_STORE_H_
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