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      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   if (DCHECK_IS_ON()) {
     35     const base::Value* current_value = NULL;
     36     DCHECK(defaults_->GetValue(pref_name, &current_value))
     37         << "Setting default for unregistered pref: " << pref_name;
     38     DCHECK(value->IsType(current_value->GetType()))
     39         << "Wrong type for new default: " << pref_name;
     40   }
     41 
     42   defaults_->ReplaceDefaultValue(pref_name, make_scoped_ptr(value));
     43 }
     44 
     45 void PrefRegistry::RegisterPreference(const char* path,
     46                                       base::Value* default_value) {
     47   base::Value::Type orig_type = default_value->GetType();
     48   DCHECK(orig_type != base::Value::TYPE_NULL &&
     49          orig_type != base::Value::TYPE_BINARY) <<
     50          "invalid preference type: " << orig_type;
     51   DCHECK(!defaults_->GetValue(path, NULL)) <<
     52       "Trying to register a previously registered pref: " << path;
     53 
     54   defaults_->SetDefaultValue(path, make_scoped_ptr(default_value));
     55 }
     56