chrome/browser/prefs/tracked/tracked_atomic_preference.cc

   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 }