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      1 // Copyright 2014 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 #include "chrome/browser/prefs/tracked/tracked_atomic_preference.h"
      6 
      7 #include "base/values.h"
      8 #include "chrome/browser/prefs/pref_hash_store_transaction.h"
      9 #include "chrome/browser/prefs/tracked/tracked_preference_validation_delegate.h"
     10 
     11 TrackedAtomicPreference::TrackedAtomicPreference(
     12     const std::string& pref_path,
     13     size_t reporting_id,
     14     size_t reporting_ids_count,
     15     PrefHashFilter::EnforcementLevel enforcement_level,
     16     TrackedPreferenceValidationDelegate* delegate)
     17     : pref_path_(pref_path),
     18       helper_(pref_path, reporting_id, reporting_ids_count, enforcement_level),
     19       delegate_(delegate) {
     20 }
     21 
     22 void TrackedAtomicPreference::OnNewValue(
     23     const base::Value* value,
     24     PrefHashStoreTransaction* transaction) const {
     25   transaction->StoreHash(pref_path_, value);
     26 }
     27 
     28 bool TrackedAtomicPreference::EnforceAndReport(
     29     base::DictionaryValue* pref_store_contents,
     30     PrefHashStoreTransaction* transaction) const {
     31   const base::Value* value = NULL;
     32   pref_store_contents->Get(pref_path_, &value);
     33   PrefHashStoreTransaction::ValueState value_state =
     34       transaction->CheckValue(pref_path_, value);
     35 
     36   helper_.ReportValidationResult(value_state);
     37 
     38   TrackedPreferenceHelper::ResetAction reset_action =
     39       helper_.GetAction(value_state);
     40   if (delegate_) {
     41     delegate_->OnAtomicPreferenceValidation(
     42         pref_path_, value, value_state, reset_action);
     43   }
     44   helper_.ReportAction(reset_action);
     45 
     46   bool was_reset = false;
     47   if (reset_action == TrackedPreferenceHelper::DO_RESET) {
     48     pref_store_contents->RemovePath(pref_path_, NULL);
     49     was_reset = true;
     50   }
     51 
     52   if (value_state != PrefHashStoreTransaction::UNCHANGED) {
     53     // Store the hash for the new value (whether it was reset or not).
     54     const base::Value* new_value = NULL;
     55     pref_store_contents->Get(pref_path_, &new_value);
     56     transaction->StoreHash(pref_path_, new_value);
     57   }
     58 
     59   return was_reset;
     60 }
     61