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// Copyright (c) 2010 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_CONTENT_SETTINGS_PREF_CONTENT_SETTINGS_PROVIDER_H_
#define CHROME_BROWSER_CONTENT_SETTINGS_PREF_CONTENT_SETTINGS_PROVIDER_H_
#pragma once
// A content settings provider that takes its settings out of the pref service.
#include "base/basictypes.h"
#include "base/synchronization/lock.h"
#include "chrome/browser/content_settings/content_settings_provider.h"
#include "chrome/browser/prefs/pref_change_registrar.h"
#include "chrome/common/notification_observer.h"
#include "chrome/common/notification_registrar.h"
class ContentSettingsDetails;
class DictionaryValue;
class PrefService;
class Profile;
class PrefContentSettingsProvider : public ContentSettingsProviderInterface,
public NotificationObserver {
public:
explicit PrefContentSettingsProvider(Profile* profile);
virtual ~PrefContentSettingsProvider();
// ContentSettingsProviderInterface implementation.
virtual bool CanProvideDefaultSetting(ContentSettingsType content_type) const;
virtual ContentSetting ProvideDefaultSetting(
ContentSettingsType content_type) const;
virtual void UpdateDefaultSetting(ContentSettingsType content_type,
ContentSetting setting);
virtual void ResetToDefaults();
virtual bool DefaultSettingIsManaged(ContentSettingsType content_type) const;
static void RegisterUserPrefs(PrefService* prefs);
// NotificationObserver implementation.
virtual void Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details);
private:
// Informs observers that content settings have changed. Make sure that
// |lock_| is not held when calling this, as listeners will usually call one
// of the GetSettings functions in response, which would then lead to a
// mutex deadlock.
void NotifyObservers(const ContentSettingsDetails& details);
void UnregisterObservers();
// Sets the fields of |settings| based on the values in |dictionary|.
void GetSettingsFromDictionary(const DictionaryValue* dictionary,
ContentSettings* settings);
// Forces the default settings to be explicitly set instead of themselves
// being CONTENT_SETTING_DEFAULT.
void ForceDefaultsToBeExplicit();
// Reads the default settings from the preferences service. If |overwrite| is
// true and the preference is missing, the local copy will be cleared as well.
void ReadDefaultSettings(bool overwrite);
// Copies of the pref data, so that we can read it on the IO thread.
ContentSettings default_content_settings_;
Profile* profile_;
// Whether this settings map is for an OTR session.
bool is_off_the_record_;
// Used around accesses to the default_content_settings_ object to guarantee
// thread safety.
mutable base::Lock lock_;
PrefChangeRegistrar pref_change_registrar_;
NotificationRegistrar notification_registrar_;
// Whether we are currently updating preferences, this is used to ignore
// notifications from the preferences service that we triggered ourself.
bool updating_preferences_;
DISALLOW_COPY_AND_ASSIGN(PrefContentSettingsProvider);
};
#endif // CHROME_BROWSER_CONTENT_SETTINGS_PREF_CONTENT_SETTINGS_PROVIDER_H_
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