Core PPAPI proxy files. This includes the dispatcher which is the control poi...

ppapi/proxy/plugin_resource.h

+// 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.
+
+#ifndef PPAPI_PROXY_PLUGIN_RESOURCE_H_
+#define PPAPI_PROXY_PLUGIN_RESOURCE_H_
+
+#include "base/basictypes.h"
+#include "ppapi/proxy/plugin_dispatcher.h"
+#include "ppapi/proxy/plugin_resource_tracker.h"
+
+// If you inherit from resource, make sure you add the class name here.
+#define FOR_ALL_RESOURCES(F) \
+  F(Graphics2D) \
+  F(ImageData) \
+  F(URLLoader)
+
+namespace pp {
+namespace proxy {
+
+// Forward declaration of Resource classes.
+#define DECLARE_RESOURCE_CLASS(RESOURCE) class RESOURCE;
+FOR_ALL_RESOURCES(DECLARE_RESOURCE_CLASS)
+#undef DECLARE_RESOURCE_CLASS
+
+class PluginResource {
+ public:
+  PluginResource();
+  virtual ~PluginResource();
+
+  // Returns NULL if the resource is invalid or is a different type.
+  template<typename T> static T* GetAs(PP_Resource res) {
+    PluginResource* resource =
+        PluginDispatcher::Get()->plugin_resource_tracker()->GetResourceObject(
+            res);
+    return resource ? resource->Cast<T>() : NULL;
+  }
+
+  template <typename T> T* Cast() { return NULL; }
+
+ private:
+  // Type-specific getters for individual resource types. These will return
+  // NULL if the resource does not match the specified type. Used by the Cast()
+  // function.
+  #define DEFINE_TYPE_GETTER(RESOURCE)  \
+      virtual RESOURCE* As##RESOURCE() { return NULL; }
+  FOR_ALL_RESOURCES(DEFINE_TYPE_GETTER)
+  #undef DEFINE_TYPE_GETTER
+
+  DISALLOW_COPY_AND_ASSIGN(PluginResource);
+};
+
+// Cast() specializations.
+#define DEFINE_RESOURCE_CAST(Type)                   \
+  template <> inline Type* PluginResource::Cast<Type>() {  \
+      return As##Type();                             \
+  }
+FOR_ALL_RESOURCES(DEFINE_RESOURCE_CAST)
+#undef DEFINE_RESOURCE_CAST
+
+}  // namespace proxy
+}  // namespace pp
+
+#endif  // PPAPI_PROXY_PLUGIN_RESOURCE_H_