Change manifest handler interface to always (implicitly) pass the entire manifest to handlers.

chrome/common/extensions/manifest_handler.cc

 // Copyright (c) 2013 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"
+#include "chrome/common/extensions/manifest.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();
+  std::set<ManifestHandler*> GetHandlers(const Manifest* manifest);
 
  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;
+std::set<ManifestHandler*> ManifestHandlerRegistry::GetHandlers(
+    const Manifest* manifest) {
+  std::set<ManifestHandler*> handlers;
   for (ManifestHandlerMap::iterator iter = handlers_.begin();
        iter != handlers_.end(); ++iter) {
-    keys.push_back(iter->first);
+    ManifestHandler* handler = iter->second.get();
+    if (manifest->HasPath(iter->first) ||
+        handler->AlwaysParseForType(manifest->type()))
+    handlers.insert(iter->second.get());
   }
-  return keys;
+  // TODO(yoz): Some handlers may depend on other handlers having already
+  // parsed their keys. Reorder the handlers so that handlers needed earlier
+  // come first in the returned container.
+  return handlers;
 }
 
 static base::LazyInstance<ManifestHandlerRegistry> g_registry =
     LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 ManifestHandler::ManifestHandler() {
 }
 
 ManifestHandler::~ManifestHandler() {
 }
 
-bool ManifestHandler::HasNoKey(Extension* extension, string16* error) {
-  return true;
+bool ManifestHandler::AlwaysParseForType(Extension::Type type) {
+  return false;
 }
 
 // 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();
+std::set<ManifestHandler*> ManifestHandler::GetHandlers(
+    const Manifest* manifest) {
+  return g_registry.Get().GetHandlers(manifest);
 }
 
 }  // namespace extensions