base/prefs/pref_value_map.cc

   1 // Copyright (c) 2011 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 "base/prefs/pref_value_map.h"
   6
   7 #include <map>
   8
   9 #include "base/logging.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/stl_util.h"
  12 #include "base/values.h"
  13
  14 PrefValueMap::PrefValueMap() {}
  15
  16 PrefValueMap::~PrefValueMap() {}
  17
  18 bool PrefValueMap::GetValue(const std::string& key,
  19                             const base::Value** value) const {
  20   const base::Value* got_value = prefs_.get(key);
  21   if (value && got_value)
  22     *value = got_value;
  23
  24   return !!got_value;
  25 }
  26
  27 bool PrefValueMap::GetValue(const std::string& key, base::Value** value) {
  28   base::Value* got_value = prefs_.get(key);
  29   if (value && got_value)
  30     *value = got_value;
  31
  32   return !!got_value;
  33 }
  34
  35 bool PrefValueMap::SetValue(const std::string& key,
  36                             scoped_ptr<base::Value> value) {
  37   DCHECK(value);
  38
  39   base::Value* old_value = prefs_.get(key);
  40   if (old_value && value->Equals(old_value))
  41     return false;
  42
  43   prefs_.set(key, value.Pass());
  44   return true;
  45 }
  46
  47 bool PrefValueMap::RemoveValue(const std::string& key) {
  48   return prefs_.erase(key) != 0;
  49 }
  50
  51 void PrefValueMap::Clear() {
  52   prefs_.clear();
  53 }
  54
  55 void PrefValueMap::Swap(PrefValueMap* other) {
  56   prefs_.swap(other->prefs_);
  57 }
  58
  59 PrefValueMap::iterator PrefValueMap::begin() {
  60   return prefs_.begin();
  61 }
  62
  63 PrefValueMap::iterator PrefValueMap::end() {
  64   return prefs_.end();
  65 }
  66
  67 PrefValueMap::const_iterator PrefValueMap::begin() const {
  68   return prefs_.begin();
  69 }
  70
  71 PrefValueMap::const_iterator PrefValueMap::end() const {
  72   return prefs_.end();
  73 }
  74
  75 bool PrefValueMap::GetBoolean(const std::string& key,
  76                               bool* value) const {
  77   const base::Value* stored_value = nullptr;
  78   return GetValue(key, &stored_value) && stored_value->GetAsBoolean(value);
  79 }
  80
  81 void PrefValueMap::SetBoolean(const std::string& key, bool value) {
  82   SetValue(key, make_scoped_ptr(new base::FundamentalValue(value)));
  83 }
  84
  85 bool PrefValueMap::GetString(const std::string& key,
  86                              std::string* value) const {
  87   const base::Value* stored_value = nullptr;
  88   return GetValue(key, &stored_value) && stored_value->GetAsString(value);
  89 }
  90
  91 void PrefValueMap::SetString(const std::string& key,
  92                              const std::string& value) {
  93   SetValue(key, make_scoped_ptr(new base::StringValue(value)));
  94 }
  95
  96 bool PrefValueMap::GetInteger(const std::string& key, int* value) const {
  97   const base::Value* stored_value = nullptr;
  98   return GetValue(key, &stored_value) && stored_value->GetAsInteger(value);
  99 }
 100
 101 void PrefValueMap::SetInteger(const std::string& key, const int value) {
 102   SetValue(key, make_scoped_ptr(new base::FundamentalValue(value)));
 103 }
 104
 105 void PrefValueMap::SetDouble(const std::string& key, const double value) {
 106   SetValue(key, make_scoped_ptr(new base::FundamentalValue(value)));
 107 }
 108
 109 void PrefValueMap::GetDifferingKeys(
 110     const PrefValueMap* other,
 111     std::vector<std::string>* differing_keys) const {
 112   differing_keys->clear();
 113
 114   // Put everything into ordered maps.
 115   std::map<std::string, base::Value*> this_prefs(prefs_.begin(), prefs_.end());
 116   std::map<std::string, base::Value*> other_prefs(other->prefs_.begin(),
 117                                                   other->prefs_.end());
 118
 119   // Walk over the maps in lockstep, adding everything that is different.
 120   auto this_pref(this_prefs.begin());
 121   auto other_pref(other_prefs.begin());
 122   while (this_pref != this_prefs.end() && other_pref != other_prefs.end()) {
 123     const int diff = this_pref->first.compare(other_pref->first);
 124     if (diff == 0) {
 125       if (!this_pref->second->Equals(other_pref->second))
 126         differing_keys->push_back(this_pref->first);
 127       ++this_pref;
 128       ++other_pref;
 129     } else if (diff < 0) {
 130       differing_keys->push_back(this_pref->first);
 131       ++this_pref;
 132     } else if (diff > 0) {
 133       differing_keys->push_back(other_pref->first);
 134       ++other_pref;
 135     }
 136   }
 137
 138   // Add the remaining entries.
 139   for ( ; this_pref != this_prefs.end(); ++this_pref)
 140       differing_keys->push_back(this_pref->first);
 141   for ( ; other_pref != other_prefs.end(); ++other_pref)
 142       differing_keys->push_back(other_pref->first);
 143 }