1 files changed, 89 insertions, 0 deletions
diff --git a/base/prefs/public/pref_change_registrar.cc b/base/prefs/public/pref_change_registrar.cc
new file mode 100644
index 0000000..e7a9791
--- /dev/null
+++ b/base/prefs/public/pref_change_registrar.cc
@@ -0,0 +1,89 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/prefs/public/pref_change_registrar.h"
+
+#include "base/logging.h"
+#include "base/prefs/public/pref_service_base.h"
+
+PrefChangeRegistrar::PrefChangeRegistrar() : service_(NULL) {}
+
+PrefChangeRegistrar::~PrefChangeRegistrar() {
+  // If you see an invalid memory access in this destructor, this
+  // PrefChangeRegistrar might be subscribed to an OffTheRecordProfileImpl that
+  // has been destroyed. This should not happen any more but be warned.
+  // Feel free to contact battre@chromium.org in case this happens.
+  RemoveAll();
+}
+
+void PrefChangeRegistrar::Init(PrefServiceBase* service) {
+  DCHECK(IsEmpty() || service_ == service);
+  service_ = service;
+}
+
+void PrefChangeRegistrar::Add(const char* path,
+                              content::NotificationObserver* obs) {
+  if (!service_) {
+    NOTREACHED();
+    return;
+  }
+  ObserverRegistration registration(path, obs);
+  if (observers_.find(registration) != observers_.end()) {
+    NOTREACHED();
+    return;
+  }
+  observers_.insert(registration);
+  service_->AddPrefObserver(path, obs);
+}
+
+void PrefChangeRegistrar::Remove(const char* path,
+                                 content::NotificationObserver* obs) {
+  if (!service_) {
+    NOTREACHED();
+    return;
+  }
+  ObserverRegistration registration(path, obs);
+  std::set<ObserverRegistration>::iterator it =
+       observers_.find(registration);
+  if (it == observers_.end()) {
+    NOTREACHED();
+    return;
+  }
+  service_->RemovePrefObserver(it->first.c_str(), it->second);
+  observers_.erase(it);
+}
+
+void PrefChangeRegistrar::RemoveAll() {
+  if (service_) {
+    for (std::set<ObserverRegistration>::const_iterator it = observers_.begin();
+         it != observers_.end(); ++it) {
+      service_->RemovePrefObserver(it->first.c_str(), it->second);
+    }
+    observers_.clear();
+  }
+}
+
+bool PrefChangeRegistrar::IsEmpty() const {
+  return observers_.empty();
+}
+
+bool PrefChangeRegistrar::IsObserved(const std::string& pref) {
+  for (std::set<ObserverRegistration>::const_iterator it = observers_.begin();
+       it != observers_.end(); ++it) {
+    if (it->first == pref)
+      return true;
+  }
+  return false;
+}
+
+bool PrefChangeRegistrar::IsManaged() {
+  for (std::set<ObserverRegistration>::const_iterator it = observers_.begin();
+       it != observers_.end(); ++it) {
+    const PrefServiceBase::Preference* pref =
+        service_->FindPreference(it->first.c_str());
+    if (pref && pref->IsManaged())
+      return true;
+  }
+  return false;
+}