// 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 WEBKIT_GLUE_PLUGINS_PEPPER_PLUGIN_MODULE_H_
#define WEBKIT_GLUE_PLUGINS_PEPPER_PLUGIN_MODULE_H_

#include <set>

#include "base/basictypes.h"
#include "base/file_path.h"
#include "base/native_library.h"
#include "base/ref_counted.h"

typedef struct _pp_Module PP_Module;

namespace pepper {

class PluginDelegate;
class PluginInstance;

class PluginModule : public base::RefCounted<PluginModule> {
 public:
  ~PluginModule();

  static scoped_refptr<PluginModule> CreateModule(const FilePath& filename);

  // Converts the given module ID to an actual module object. Will return NULL
  // if the module is invalid.
  static PluginModule* FromPPModule(PP_Module module);

  PP_Module GetPPModule() const;

  PluginInstance* CreateInstance(PluginDelegate* delegate);

  // Returns "some" plugin instance associated with this module. This is not
  // guaranteed to be any one in particular. This is normally used to execute
  // callbacks up to the browser layer that are not inherently per-instance,
  // but the delegate lives only on the plugin instance so we need one of them.
  PluginInstance* GetSomeInstance() const;

  const void* GetPluginInterface(const char* name) const;

  // This module is associated with a set of instances. The PluginInstance
  // object declares its association with this module in its destructor and
  // releases us in its destructor.
  void InstanceCreated(PluginInstance* instance);
  void InstanceDeleted(PluginInstance* instance);

 private:
  typedef const void* (*PPP_GetInterfaceFunc)(const char*);

  explicit PluginModule(const FilePath& filename);

  bool Load();

  FilePath filename_;

  bool initialized_;
  base::NativeLibrary library_;

  PPP_GetInterfaceFunc ppp_get_interface_;

  // Non-owning pointers to all instances associated with this module. When
  // there are no more instances, this object should be deleted.
  typedef std::set<PluginInstance*> PluginInstanceSet;
  PluginInstanceSet instances_;

  DISALLOW_COPY_AND_ASSIGN(PluginModule);
};

}  // namespace pepper

#endif  // WEBKIT_GLUE_PLUGINS_PEPPER_PLUGIN_MODULE_H_