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/values.h"
  11
  12 PrefRegistry::PrefRegistry()
  13     : defaults_(new DefaultPrefStore()) {
  14 }
  15
  16 PrefRegistry::~PrefRegistry() {
  17 }
  18
  19 scoped_refptr<PrefStore> PrefRegistry::defaults() {
  20   return defaults_.get();
  21 }
  22
  23 PrefRegistry::const_iterator PrefRegistry::begin() const {
  24   return defaults_->begin();
  25 }
  26
  27 PrefRegistry::const_iterator PrefRegistry::end() const {
  28   return defaults_->end();
  29 }
  30
  31 void PrefRegistry::SetDefaultPrefValue(const char* pref_name,
  32                                        base::Value* value) {
  33   DCHECK(value);
  34   const base::Value* current_value = NULL;
  35   DCHECK(defaults_->GetValue(pref_name, &current_value))
  36       << "Setting default for unregistered pref: " << pref_name;
  37   DCHECK(value->IsType(current_value->GetType()))
  38       << "Wrong type for new default: " << pref_name;
  39
  40   defaults_->ReplaceDefaultValue(pref_name, make_scoped_ptr(value));
  41 }
  42
  43 void PrefRegistry::RegisterPreference(const char* path,
  44                                       base::Value* default_value) {
  45   base::Value::Type orig_type = default_value->GetType();
  46   DCHECK(orig_type != base::Value::TYPE_NULL &&
  47          orig_type != base::Value::TYPE_BINARY) <<
  48          "invalid preference type: " << orig_type;
  49   DCHECK(!defaults_->GetValue(path, NULL)) <<
  50       "Trying to register a previously registered pref: " << path;
  51
  52   defaults_->SetDefaultValue(path, make_scoped_ptr(default_value));
  53 }