src/chrome/browser/prefs/tracked/tracked_split_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_split_preference.h"
   6
   7 #include <vector>
   8
   9 #include "base/logging.h"
  10 #include "base/values.h"
  11 #include "chrome/browser/prefs/tracked/pref_hash_store_transaction.h"
  12 #include "chrome/browser/prefs/tracked/tracked_preference_validation_delegate.h"
  13
  14 TrackedSplitPreference::TrackedSplitPreference(
  15     const std::string& pref_path,
  16     size_t reporting_id,
  17     size_t reporting_ids_count,
  18     PrefHashFilter::EnforcementLevel enforcement_level,
  19     TrackedPreferenceValidationDelegate* delegate)
  20     : pref_path_(pref_path),
  21       helper_(pref_path, reporting_id, reporting_ids_count, enforcement_level),
  22       delegate_(delegate) {
  23 }
  24
  25 void TrackedSplitPreference::OnNewValue(
  26     const base::Value* value,
  27     PrefHashStoreTransaction* transaction) const {
  28   const base::DictionaryValue* dict_value = NULL;
  29   if (value && !value->GetAsDictionary(&dict_value)) {
  30     NOTREACHED();
  31     return;
  32   }
  33   transaction->StoreSplitHash(pref_path_, dict_value);
  34 }
  35
  36 bool TrackedSplitPreference::EnforceAndReport(
  37     base::DictionaryValue* pref_store_contents,
  38     PrefHashStoreTransaction* transaction) const {
  39   base::DictionaryValue* dict_value = NULL;
  40   if (!pref_store_contents->GetDictionary(pref_path_, &dict_value) &&
  41       pref_store_contents->Get(pref_path_, NULL)) {
  42     // There should be a dictionary or nothing at |pref_path_|.
  43     NOTREACHED();
  44     return false;
  45   }
  46
  47   std::vector<std::string> invalid_keys;
  48   PrefHashStoreTransaction::ValueState value_state =
  49       transaction->CheckSplitValue(pref_path_, dict_value, &invalid_keys);
  50
  51   if (value_state == PrefHashStoreTransaction::CHANGED)
  52     helper_.ReportSplitPreferenceChangedCount(invalid_keys.size());
  53
  54   helper_.ReportValidationResult(value_state);
  55
  56   TrackedPreferenceHelper::ResetAction reset_action =
  57       helper_.GetAction(value_state);
  58   if (delegate_) {
  59     delegate_->OnSplitPreferenceValidation(
  60         pref_path_, dict_value, invalid_keys, value_state, reset_action);
  61   }
  62   helper_.ReportAction(reset_action);
  63
  64   bool was_reset = false;
  65   if (reset_action == TrackedPreferenceHelper::DO_RESET) {
  66     if (value_state == PrefHashStoreTransaction::CHANGED) {
  67       DCHECK(!invalid_keys.empty());
  68
  69       for (std::vector<std::string>::const_iterator it =
  70                invalid_keys.begin(); it != invalid_keys.end(); ++it) {
  71         dict_value->Remove(*it, NULL);
  72       }
  73     } else {
  74       pref_store_contents->RemovePath(pref_path_, NULL);
  75     }
  76     was_reset = true;
  77   }
  78
  79   if (value_state != PrefHashStoreTransaction::UNCHANGED) {
  80     // Store the hash for the new value (whether it was reset or not).
  81     const base::DictionaryValue* new_dict_value = NULL;
  82     pref_store_contents->GetDictionary(pref_path_, &new_dict_value);
  83     transaction->StoreSplitHash(pref_path_, new_dict_value);
  84   }
  85
  86   return was_reset;
  87 }