SupportsUserData and manifest handlers for Extension; use them for the Omnibox API.

chrome/common/extensions/manifest_handler.cc

+// Copyright (c) 2012 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 "chrome/common/extensions/manifest_handler.h"
+
+#include <map>
+
+#include "base/lazy_instance.h"
+#include "base/memory/linked_ptr.h"
+
+namespace extensions {
+
+namespace {
+
+class ManifestHandlerRegistry {
+ public:
+  void RegisterManifestHandler(const std::string& key,
+                               ManifestHandler* handler);
+  ManifestHandler* GetManifestHandler(const std::string& key);
+  std::vector<std::string> GetManifestHandlerKeys();
+
+ private:
+  friend struct base::DefaultLazyInstanceTraits<ManifestHandlerRegistry>;
+  typedef std::map<std::string, linked_ptr<ManifestHandler> >
+      ManifestHandlerMap;
+
+  ManifestHandlerMap handlers_;
+};
+
+void ManifestHandlerRegistry::RegisterManifestHandler(
+    const std::string& key, ManifestHandler* handler) {
+  handlers_[key] = make_linked_ptr(handler);
+}
+
+ManifestHandler* ManifestHandlerRegistry::GetManifestHandler(
+    const std::string& key) {
+  ManifestHandlerMap::iterator iter = handlers_.find(key);
+  if (iter != handlers_.end())
+    return iter->second.get();
+  // TODO(yoz): The NOTREACHED only makes sense as long as
+  // GetManifestHandlerKeys is how we're getting the available
+  // manifest handlers.
+  NOTREACHED();
+  return NULL;
+}
+
+std::vector<std::string> ManifestHandlerRegistry::GetManifestHandlerKeys() {
+  std::vector<std::string> keys;
+  for (ManifestHandlerMap::iterator iter = handlers_.begin();
+       iter != handlers_.end(); ++iter) {
+    keys.push_back(iter->first);
+  }
+  return keys;
+}
+
+static base::LazyInstance<ManifestHandlerRegistry> g_registry =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+ManifestHandler::ManifestHandler() {
+}
+
+ManifestHandler::~ManifestHandler() {
+}
+
+// static
+void ManifestHandler::Register(const std::string& key,
+                               ManifestHandler* handler) {
+  g_registry.Get().RegisterManifestHandler(key, handler);
+}
+
+// static
+ManifestHandler* ManifestHandler::Get(const std::string& key) {
+  return g_registry.Get().GetManifestHandler(key);
+}
+
+// static
+std::vector<std::string> ManifestHandler::GetKeys() {
+  return g_registry.Get().GetManifestHandlerKeys();
+}
+
+}  // namespace extensions