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// 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.
#ifndef WEBKIT_PLUGINS_PPAPI_NPOBJECT_VAR_H_
#define WEBKIT_PLUGINS_PPAPI_NPOBJECT_VAR_H_
#include <string>
#include "base/compiler_specific.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/shared_impl/var.h"
#include "webkit/plugins/webkit_plugins_export.h"
typedef struct NPObject NPObject;
typedef struct _NPVariant NPVariant;
typedef void* NPIdentifier;
namespace ppapi {
// NPObjectVar -----------------------------------------------------------------
// Represents a JavaScript object Var. By itself, this represents random
// NPObjects that a given plugin (identified by the resource's module) wants to
// reference. If two different modules reference the same NPObject (like the
// "window" object), then there will be different NPObjectVar's (and hence
// PP_Var IDs) for each module. This allows us to track all references owned by
// a given module and free them when the plugin exits independently of other
// plugins that may be running at the same time.
class NPObjectVar : public Var {
public:
// You should always use FromNPObject to create an NPObjectVar. This function
// guarantees that we maintain the 1:1 mapping between NPObject and
// NPObjectVar.
NPObjectVar(PP_Instance instance, NPObject* np_object);
virtual ~NPObjectVar();
// Var overrides.
virtual NPObjectVar* AsNPObjectVar() OVERRIDE;
virtual PP_VarType GetType() const OVERRIDE;
// Returns the underlying NPObject corresponding to this NPObjectVar.
// Guaranteed non-NULL.
NPObject* np_object() const { return np_object_; }
// Notification that the instance was deleted, the internal reference will be
// zeroed out.
void InstanceDeleted();
// Possibly 0 if the object has outlived its instance.
PP_Instance pp_instance() const { return pp_instance_; }
// Helper function that converts a PP_Var to an object. This will return NULL
// if the PP_Var is not of object type or the object is invalid.
WEBKIT_PLUGINS_EXPORT static scoped_refptr<NPObjectVar> FromPPVar(PP_Var var);
private:
// Possibly 0 if the object has outlived its instance.
PP_Instance pp_instance_;
// Guaranteed non-NULL, this is the underlying object used by WebKit. We
// hold a reference to this object.
NPObject* np_object_;
DISALLOW_COPY_AND_ASSIGN(NPObjectVar);
};
} // namespace
#endif // WEBKIT_PLUGINS_PPAPI_NPOBJECT_VAR_H_
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