/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

#ifndef nsComponentManagerUtils_h__
#define nsComponentManagerUtils_h__

/*
 * Do not include this file directly.  Instead,
 * |#include "nsIComponentManager.h"|.
 */

#ifndef nsCOMPtr_h__
#include "nsCOMPtr.h"
#endif

#ifndef OBSOLETE_MODULE_LOADING
/*
 * Prototypes for dynamic library export functions. Your DLL/DSO needs to export
 * these methods to play in the component world.
 *
 * THIS IS OBSOLETE. Look at nsIModule.idl
 */

extern "C" NS_EXPORT nsresult NSGetFactory(nsISupports* aServMgr,
                                           const nsCID &aClass,
                                           const char *aClassName,
                                           const char *aContractID,
                                           nsIFactory **aFactory);
extern "C" NS_EXPORT PRBool   NSCanUnload(nsISupports* aServMgr);
extern "C" NS_EXPORT nsresult NSRegisterSelf(nsISupports* aServMgr, const char *fullpath);
extern "C" NS_EXPORT nsresult NSUnregisterSelf(nsISupports* aServMgr, const char *fullpath);

typedef nsresult (*nsFactoryProc)(nsISupports* aServMgr,
                                  const nsCID &aClass,
                                  const char *aClassName,
                                  const char *aContractID,
                                  nsIFactory **aFactory);
typedef PRBool   (*nsCanUnloadProc)(nsISupports* aServMgr);
typedef nsresult (*nsRegisterProc)(nsISupports* aServMgr, const char *path);
typedef nsresult (*nsUnregisterProc)(nsISupports* aServMgr, const char *path);
#endif /* OBSOLETE_MODULE_LOADING */

#define NS_COMPONENTMANAGER_CID                      \
{ /* 91775d60-d5dc-11d2-92fb-00e09805570f */         \
    0x91775d60,                                      \
    0xd5dc,                                          \
    0x11d2,                                          \
    {0x92, 0xfb, 0x00, 0xe0, 0x98, 0x05, 0x57, 0x0f} \
}

#define NS_COMPONENTMANAGER_CONTRACTID "@mozilla.org/xpcom/componentmanager;1"

extern NS_COM nsresult
NS_GetGlobalComponentManager(nsIComponentManager* *result);

////////////////////////////////////////////////////////////////////////////////
// Global Static Component Manager Methods
// (for when you need to link with xpcom)

class NS_COM nsComponentManager {
public:
  static nsresult Initialize(void);

  // Finds a factory for a specific class ID
  static nsresult FindFactory(const nsCID &aClass,
                              nsIFactory **aFactory);

  // Get the singleton class object that implements the CID aClass
  static nsresult GetClassObject(const nsCID &aClass, const nsIID &aIID,
                                 void **aResult);

  // Finds a class ID for a specific Program ID
  static nsresult ContractIDToClassID(const char *aContractID,
                                nsCID *aClass);
  
  // Finds a Program ID for a specific class ID
  // caller frees the result with delete[]
  static nsresult CLSIDToContractID(nsCID *aClass,
                                char* *aClassName,
                                char* *aContractID);
  
  // Creates a class instance for a specific class ID
  static nsresult CreateInstance(const nsCID &aClass, 
                                 nsISupports *aDelegate,
                                 const nsIID &aIID,
                                 void **aResult);

  // Convenience routine, creates a class instance for a specific ContractID
  static nsresult CreateInstance(const char *aContractID,
                                 nsISupports *aDelegate,
                                 const nsIID &aIID,
                                 void **aResult);

  // Manually registry a factory for a class
  static nsresult RegisterFactory(const nsCID &aClass,
                                  const char *aClassName,
                                  const char *aContractID,
                                  nsIFactory *aFactory,
                                  PRBool aReplace);

  // Manually register a dynamically loaded component.
  // The libraryPersistentDescriptor is what gets passed to the library
  // self register function from ComponentManager. The format of this string
  // is the same as nsIFile::GetPath()
  //
  // This function will go away in favour of RegisterComponentSpec. In fact,
  // it internally turns around and calls RegisterComponentSpec.
  static nsresult RegisterComponent(const nsCID &aClass,
                               const char *aClassName,
                               const char *aContractID,
                               const char *aLibraryPersistentDescriptor,
                               PRBool aReplace,
                               PRBool aPersist);

  // Register a component using its FileSpec as its identification
  // This is the more prevalent use.
  static nsresult RegisterComponentSpec(const nsCID &aClass,
                                   const char *aClassName,
                                   const char *aContractID,
                                   nsIFile *aLibrary,
                                   PRBool aReplace,
                                   PRBool aPersist);

  // Register a component using its dllName. This could be a dll name with
  // no path so that LD_LIBRARY_PATH on unix or PATH on win can load it. Or
  // this could be a code fragment name on the Mac.
  static nsresult RegisterComponentLib(const nsCID &aClass,
                                       const char *aClassName,
                                       const char *aContractID,
                                       const char *adllName,
                                       PRBool aReplace,
                                       PRBool aPersist);
  

  // Manually unregister a factory for a class
  static nsresult UnregisterFactory(const nsCID &aClass,
                                    nsIFactory *aFactory);

  // Manually unregister a dynamically loaded component
  static nsresult UnregisterComponent(const nsCID &aClass,
                                      const char *aLibrary);

  // Manually unregister a dynamically loaded component
  static nsresult UnregisterComponentSpec(const nsCID &aClass,
                                          nsIFile *aLibrarySpec);

  // Unload dynamically loaded factories that are not in use
  static nsresult FreeLibraries(void);
  //////////////////////////////////////////////////////////////////////////////
  // DLL registration support

  // If directory is NULL, then AutoRegister will try registering components
  // in the default components directory.
  static nsresult AutoRegister(PRInt32 when, nsIFile* directory);
  static nsresult AutoRegisterComponent(PRInt32 when, nsIFile *component);
  static nsresult AutoUnregisterComponent(PRInt32 when, nsIFile *component);

  // Is the given CID currently registered?
  static nsresult IsRegistered(const nsCID &aClass,
                               PRBool *aRegistered);

  // Get an enumeration of all the CIDs
  static nsresult EnumerateCLSIDs(nsIEnumerator** aEmumerator);
    
  // Get an enumeration of all the ContractIDs
  static nsresult EnumerateContractIDs(nsIEnumerator** aEmumerator);

};


class NS_COM nsCreateInstanceByCID : public nsCOMPtr_helper
	{
		public:
			nsCreateInstanceByCID( const nsCID& aCID, nsISupports* aOuter, nsresult* aErrorPtr )
					: mCID(aCID),
						mOuter(aOuter),
						mErrorPtr(aErrorPtr)
				{
					// nothing else to do here
				}

			virtual nsresult operator()( const nsIID&, void** ) const;

		private:
			const nsCID&	mCID;
			nsISupports*	mOuter;
			nsresult*			mErrorPtr;
	};

class NS_COM nsCreateInstanceByContractID : public nsCOMPtr_helper
	{
		public:
			nsCreateInstanceByContractID( const char* aContractID, nsISupports* aOuter, nsresult* aErrorPtr )
					: mContractID(aContractID),
						mOuter(aOuter),
						mErrorPtr(aErrorPtr)
				{
					// nothing else to do here
				}

			virtual nsresult operator()( const nsIID&, void** ) const;

		private:
			const char*	  mContractID;
			nsISupports*	mOuter;
			nsresult*			mErrorPtr;
	};

class NS_COM nsCreateInstanceFromCategory : public nsCOMPtr_helper
{
public:
    nsCreateInstanceFromCategory(const char *aCategory, const char *aEntry,
                                 nsISupports *aOuter, nsresult *aErrorPtr)
        : mCategory(aCategory),
          mEntry(aEntry),
          mErrorPtr(aErrorPtr)
    {
        // nothing else to do;
    }
    virtual nsresult operator()( const nsIID&, void** ) const;
    virtual ~nsCreateInstanceFromCategory() {};

private:
    const char *mCategory;
    const char *mEntry;
    nsISupports *mOuter;
    nsresult *mErrorPtr;
};

inline
const nsCreateInstanceByCID
do_CreateInstance( const nsCID& aCID, nsresult* error = 0 )
	{
		return nsCreateInstanceByCID(aCID, 0, error);
	}

inline
const nsCreateInstanceByCID
do_CreateInstance( const nsCID& aCID, nsISupports* aOuter, nsresult* error = 0 )
	{
		return nsCreateInstanceByCID(aCID, aOuter, error);
	}

inline
const nsCreateInstanceByContractID
do_CreateInstance( const char* aContractID, nsresult* error = 0 )
	{
		return nsCreateInstanceByContractID(aContractID, 0, error);
	}

inline
const nsCreateInstanceByContractID
do_CreateInstance( const char* aContractID, nsISupports* aOuter, nsresult* error = 0 )
	{
		return nsCreateInstanceByContractID(aContractID, aOuter, error);
	}

inline
const nsCreateInstanceFromCategory
do_CreateInstanceFromCategory( const char *aCategory, const char *aEntry,
                               nsresult *aErrorPtr = 0)
{
    return nsCreateInstanceFromCategory(aCategory, aEntry, 0, aErrorPtr);
}

inline
const nsCreateInstanceFromCategory
do_CreateInstanceFromCategory( const char *aCategory, const char *aEntry,
                               nsISupports *aOuter, nsresult *aErrorPtr = 0)
{
    return nsCreateInstanceFromCategory(aCategory, aEntry, aOuter, aErrorPtr);
}

// type-safe shortcuts for calling |CreateInstance|
template <class DestinationType>
inline
nsresult
CallCreateInstance( const nsCID &aClass,
                    nsISupports *aDelegate,
                    DestinationType** aDestination )
  {
    NS_PRECONDITION(aDestination, "null parameter");

    return nsComponentManager::CreateInstance(aClass, aDelegate,
               NS_GET_IID(DestinationType),
               NS_REINTERPRET_CAST(void**, aDestination));
  }

template <class DestinationType>
inline
nsresult
CallCreateInstance( const nsCID &aClass,
                    DestinationType** aDestination )
  {
    NS_PRECONDITION(aDestination, "null parameter");

    return nsComponentManager::CreateInstance(aClass, nsnull,
               NS_GET_IID(DestinationType),
               NS_REINTERPRET_CAST(void**, aDestination));
  }

template <class DestinationType>
inline
nsresult
CallCreateInstance( const char *aContractID,
                    nsISupports *aDelegate,
                    DestinationType** aDestination )
  {
    NS_PRECONDITION(aContractID, "null parameter");
    NS_PRECONDITION(aDestination, "null parameter");

    return nsComponentManager::CreateInstance(aContractID, aDelegate,
               NS_GET_IID(DestinationType),
               NS_REINTERPRET_CAST(void**, aDestination));
  }

template <class DestinationType>
inline
nsresult
CallCreateInstance( const char *aContractID,
                    DestinationType** aDestination )
  {
    NS_PRECONDITION(aContractID, "null parameter");
    NS_PRECONDITION(aDestination, "null parameter");

    return nsComponentManager::CreateInstance(aContractID, nsnull,
               NS_GET_IID(DestinationType),
               NS_REINTERPRET_CAST(void**, aDestination));
  }

/* keys for registry use */
extern const char xpcomKeyName[];
extern const char xpcomComponentsKeyName[];
extern const char lastModValueName[];
extern const char fileSizeValueName[];
extern const char nativeComponentType[];
extern const char staticComponentType[];

#endif /* nsComponentManagerUtils_h__ */