base/prefs/pref_registry.cc

   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 #include "base/prefs/pref_registry.h"
   6
   7 #include "base/logging.h"
   8 #include "base/prefs/default_pref_store.h"
   9 #include "base/prefs/pref_store.h"
  10 #include "base/stl_util.h"
  11 #include "base/values.h"
  12
  13 PrefRegistry::PrefRegistry()
  14     : defaults_(new DefaultPrefStore()) {
  15 }
  16
  17 PrefRegistry::~PrefRegistry() {
  18 }
  19
  20 uint32 PrefRegistry::GetRegistrationFlags(const std::string& pref_name) const {
  21   const auto& it = registration_flags_.find(pref_name);
  22   if (it == registration_flags_.end())
  23     return NO_REGISTRATION_FLAGS;
  24   return it->second;
  25 }
  26
  27 scoped_refptr<PrefStore> PrefRegistry::defaults() {
  28   return defaults_.get();
  29 }
  30
  31 PrefRegistry::const_iterator PrefRegistry::begin() const {
  32   return defaults_->begin();
  33 }
  34
  35 PrefRegistry::const_iterator PrefRegistry::end() const {
  36   return defaults_->end();
  37 }
  38
  39 void PrefRegistry::SetDefaultPrefValue(const std::string& pref_name,
  40                                        base::Value* value) {
  41   DCHECK(value);
  42   const base::Value* current_value = NULL;
  43   DCHECK(defaults_->GetValue(pref_name, &current_value))
  44       << "Setting default for unregistered pref: " << pref_name;
  45   DCHECK(value->IsType(current_value->GetType()))
  46       << "Wrong type for new default: " << pref_name;
  47
  48   defaults_->ReplaceDefaultValue(pref_name, make_scoped_ptr(value));
  49 }
  50
  51 void PrefRegistry::RegisterPreference(const std::string& path,
  52                                       base::Value* default_value,
  53                                       uint32 flags) {
  54   base::Value::Type orig_type = default_value->GetType();
  55   DCHECK(orig_type != base::Value::TYPE_NULL &&
  56          orig_type != base::Value::TYPE_BINARY) <<
  57          "invalid preference type: " << orig_type;
  58   DCHECK(!defaults_->GetValue(path, NULL)) <<
  59       "Trying to register a previously registered pref: " << path;
  60   DCHECK(!ContainsKey(registration_flags_, path)) <<
  61       "Trying to register a previously registered pref: " << path;
  62
  63   defaults_->SetDefaultValue(path, make_scoped_ptr(default_value));
  64   if (flags != NO_REGISTRATION_FLAGS)
  65     registration_flags_[path] = flags;
  66 }