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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PREF_STORE_H_
      6 #define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PREF_STORE_H_
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "base/observer_list.h"
     13 #include "base/prefs/pref_store.h"
     14 #include "base/values.h"
     15 #include "chrome/browser/policy/policy_map.h"
     16 #include "chrome/browser/policy/policy_service.h"
     17 #include "chrome/browser/policy/policy_types.h"
     18 
     19 class PrefValueMap;
     20 
     21 namespace policy {
     22 
     23 class ConfigurationPolicyHandlerList;
     24 
     25 // An implementation of PrefStore that bridges policy settings as read from the
     26 // PolicyService to preferences. Converts POLICY_DOMAIN_CHROME policies a given
     27 // PolicyLevel to their corresponding preferences.
     28 class ConfigurationPolicyPrefStore
     29     : public PrefStore,
     30       public PolicyService::Observer {
     31  public:
     32   // Does not take ownership of |service| nor |handler_list|, which must outlive
     33   // the store. Only policies of the given |level| will be mapped.
     34   ConfigurationPolicyPrefStore(
     35       PolicyService* service,
     36       const ConfigurationPolicyHandlerList* handler_list,
     37       PolicyLevel level);
     38 
     39   // PrefStore methods:
     40   virtual void AddObserver(PrefStore::Observer* observer) OVERRIDE;
     41   virtual void RemoveObserver(PrefStore::Observer* observer) OVERRIDE;
     42   virtual size_t NumberOfObservers() const OVERRIDE;
     43   virtual bool IsInitializationComplete() const OVERRIDE;
     44   virtual bool GetValue(const std::string& key,
     45                         const Value** result) const OVERRIDE;
     46 
     47   // PolicyService::Observer methods:
     48   virtual void OnPolicyUpdated(const PolicyNamespace& ns,
     49                                const PolicyMap& previous,
     50                                const PolicyMap& current) OVERRIDE;
     51   virtual void OnPolicyServiceInitialized(PolicyDomain domain) OVERRIDE;
     52 
     53  private:
     54   virtual ~ConfigurationPolicyPrefStore();
     55 
     56   // Refreshes policy information, rereading policy from the policy service and
     57   // sending out change notifications as appropriate.
     58   void Refresh();
     59 
     60   // Returns a new PrefValueMap containing the preference values that correspond
     61   // to the policies currently provided by the policy service.
     62   PrefValueMap* CreatePreferencesFromPolicies();
     63 
     64   // The PolicyService from which policy settings are read.
     65   PolicyService* policy_service_;
     66 
     67   // The policy handlers used to convert policies into their corresponding
     68   // preferences.
     69   const ConfigurationPolicyHandlerList* handler_list_;
     70 
     71   // The policy level that this PrefStore uses.
     72   PolicyLevel level_;
     73 
     74   // Current policy preferences.
     75   scoped_ptr<PrefValueMap> prefs_;
     76 
     77   ObserverList<PrefStore::Observer, true> observers_;
     78 
     79   DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyPrefStore);
     80 };
     81 
     82 }  // namespace policy
     83 
     84 #endif  // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_PREF_STORE_H_
     85