webkit/plugins/ppapi/resource_helper.h

   1 // Copyright (c) 2011 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 #ifndef WEBKIT_PLUGINS_PPAPI_RESOURCE_HELPER_H_
   6 #define WEBKIT_PLUGINS_PPAPI_RESOURCE_HELPER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "ppapi/c/pp_instance.h"
  10 #include "ppapi/c/pp_resource.h"
  11 #include "webkit/plugins/webkit_plugins_export.h"
  12
  13 namespace ppapi {
  14 class Resource;
  15 }
  16
  17 namespace webkit {
  18 namespace ppapi {
  19
  20 class PluginInstance;
  21 class PluginModule;
  22 class PluginDelegate;
  23
  24 // Helper functions for Resoruce implementations.
  25 //
  26 // This is specifically not designed to be a base class that derives from
  27 // ppapi::Resource to avoid diamond inheritance if most of a resource class
  28 // is implemented in the shared_impl (to share code with the proxy).
  29 class ResourceHelper {
  30  public:
  31   // Returns the instance implementation object for the given resource, or NULL
  32   // if the resource has outlived its instance.
  33   static PluginInstance* GetPluginInstance(const ::ppapi::Resource* resource);
  34
  35   // Returns the module for the given resource, or NULL if the resource has
  36   // outlived its instance.
  37   WEBKIT_PLUGINS_EXPORT static PluginModule* GetPluginModule(
  38       const ::ppapi::Resource* resource);
  39
  40   // Returns the plugin delegate for the given resource, or NULL if the
  41   // resource has outlived its instance.
  42   static PluginDelegate* GetPluginDelegate(const ::ppapi::Resource* resource);
  43
  44   // Returns the instance implementation object for the pp_instance.
  45   static PluginInstance* PPInstanceToPluginInstance(PP_Instance instance);
  46
  47  private:
  48   DISALLOW_IMPLICIT_CONSTRUCTORS(ResourceHelper);
  49 };
  50
  51 }  // namespace ppapi
  52 }  // namespace webkit
  53
  54 #endif  // WEBKIT_PLUGINS_PPAPI_RESOURCE_IMPL_HELPER_H_