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 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


#ifndef _EXTENSIONS_COMPONENT_MODULE_HXX_
#define _EXTENSIONS_COMPONENT_MODULE_HXX_

/** you may find this file helpful if you implement a component (in it's own library) which can't use
	the usual infrastructure.<br/>
	More precise, you find helper classes to ease the use of resources and the registration of services.
	<p>
	You need to define a preprocessor variable COMPMOD_NAMESPACE in order to use this file. Set it to a string
	which should be used as namespace for the classes defined herein.</p>
*/

#include <osl/mutex.hxx>
#include <tools/resid.hxx>
#include <com/sun/star/lang/XMultiServiceFactory.hpp>
#include <com/sun/star/lang/XSingleServiceFactory.hpp>
#include <com/sun/star/uno/Sequence.hxx>
#include <com/sun/star/registry/XRegistryKey.hpp>
#include <cppuhelper/factory.hxx>
#include <rtl/string.hxx>

class ResMgr;

//.........................................................................
namespace COMPMOD_NAMESPACE
{
//.........................................................................

typedef ::com::sun::star::uno::Reference< ::com::sun::star::lang::XSingleServiceFactory > (SAL_CALL *FactoryInstantiation)
		(
			const ::com::sun::star::uno::Reference< ::com::sun::star::lang::XMultiServiceFactory >& _rServiceManager,
			const ::rtl::OUString & _rComponentName,
			::cppu::ComponentInstantiation _pCreateFunction,
			const ::com::sun::star::uno::Sequence< ::rtl::OUString > & _rServiceNames,
			rtl_ModuleCount* _pModuleCounter
		);

	//=========================================================================
	//= OModule
	//=========================================================================
	class OModuleImpl;
	class OModule
	{
		friend class OModuleResourceClient;

	private:
		OModule();
			// not implemented. OModule is a static class

	protected:
		// resource administration
		static ::osl::Mutex		s_aMutex;		/// access safety
		static sal_Int32		s_nClients;		/// number of registered clients
		static OModuleImpl*		s_pImpl;		/// impl class. lives as long as at least one client for the module is registered
		static ::rtl::OString	s_sResPrefix;

		// auto registration administration
		static	::com::sun::star::uno::Sequence< ::rtl::OUString >*
			s_pImplementationNames;
		static	::com::sun::star::uno::Sequence< ::com::sun::star::uno::Sequence< ::rtl::OUString > >*
			s_pSupportedServices;
		static	::com::sun::star::uno::Sequence< sal_Int64 >*
			s_pCreationFunctionPointers;
		static	::com::sun::star::uno::Sequence< sal_Int64 >*
			s_pFactoryFunctionPointers;

	public:
		// cna be set as long as no resource has been accessed ...
		static void		setResourceFilePrefix(const ::rtl::OString& _rPrefix);

		/// get the vcl res manager of the module
		static ResMgr*	getResManager();

		/** register a component implementing a service with the given data.
			@param	_rImplementationName
						the implementation name of the component
			@param	_rServiceNames
						the services the component supports
			@param	_pCreateFunction
						a function for creating an instance of the component
			@param	_pFactoryFunction
						a function for creating a factory for that component
			@see revokeComponent
		*/
		static void registerComponent(
			const ::rtl::OUString& _rImplementationName,
			const ::com::sun::star::uno::Sequence< ::rtl::OUString >& _rServiceNames,
			::cppu::ComponentInstantiation _pCreateFunction,
			FactoryInstantiation _pFactoryFunction);

		/** revoke the registration for the specified component
			@param	_rImplementationName
				the implementation name of the component
		*/
		static void revokeComponent(
			const ::rtl::OUString& _rImplementationName);

		/** creates a Factory for the component with the given implementation name.
			<p>Usually used from within component_getFactory.<p/>
			@param	_rxServiceManager
						a pointer to an XMultiServiceFactory interface as got in component_getFactory
			@param	_pImplementationName
						the implementation name of the component
			@return
						the XInterface access to a factory for the component
		*/
		static ::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface > getComponentFactory(
			const ::rtl::OUString& _rImplementationName,
			const ::com::sun::star::uno::Reference< ::com::sun::star::lang::XMultiServiceFactory >& _rxServiceManager
			);

	protected:
		/// register a client for the module
		static void	registerClient();
		/// revoke a client for the module
		static void	revokeClient();

	private:
		/** ensure that the impl class exists
			@precond m_aMutex is guarded when this method gets called
		*/
		static void ensureImpl();
	};

	//=========================================================================
	//= OModuleResourceClient
	//=========================================================================
	/** base class for objects which uses any global module-specific ressources 
	*/
	class OModuleResourceClient
	{
	public:
		OModuleResourceClient()		{ OModule::registerClient(); }
		~OModuleResourceClient()	{ OModule::revokeClient(); }
	};

	//=========================================================================
	//= ModuleRes
	//=========================================================================
	/** specialized ResId, using the ressource manager provided by the global module
	*/
	class ModuleRes : public ::ResId
	{
	public:
		ModuleRes(sal_uInt16 _nId) : ResId(_nId, *OModule::getResManager()) { }
	};

	//==========================================================================
	//= OMultiInstanceAutoRegistration
	//==========================================================================
	template <class TYPE>
	class OMultiInstanceAutoRegistration
	{
	public:
		/** automatically registeres a multi instance component
			<p>Assumed that the template argument has the three methods
				<ul>
					<li><code>static ::rtl::OUString getImplementationName_Static()</code><li/>
					<li><code>static ::com::sun::star::uno::Sequence< ::rtl::OUString > getSupportedServiceNames_Static()</code><li/>
					<li><code>static ::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface >
						Create(const ::com::sun::star::uno::Reference< ::com::sun::star::lang::XMultiServiceFactory >&)</code>
						</li>
				<ul/>
			the instantiation of this object will automatically register the class via <method>OModule::registerComponent</method>.
			<p/>
			The factory creation function used is <code>::cppu::createSingleFactory</code>.
			@see OOneInstanceAutoRegistration
		*/
		OMultiInstanceAutoRegistration();
		~OMultiInstanceAutoRegistration();
	};

	template <class TYPE>
	OMultiInstanceAutoRegistration<TYPE>::OMultiInstanceAutoRegistration()
	{
		OModule::registerComponent(
			TYPE::getImplementationName_Static(),
			TYPE::getSupportedServiceNames_Static(),
			TYPE::Create,
			::cppu::createSingleFactory
			);
	}

	template <class TYPE>
	OMultiInstanceAutoRegistration<TYPE>::~OMultiInstanceAutoRegistration()
	{
		OModule::revokeComponent(TYPE::getImplementationName_Static());
	}

	//==========================================================================
	//= OOneInstanceAutoRegistration
	//==========================================================================
	template <class TYPE>
	class OOneInstanceAutoRegistration
	{
	public:
		/** automatically registeres a single instance component
			<p>Assumed that the template argument has the three methods
				<ul>
					<li><code>static ::rtl::OUString getImplementationName_Static()</code><li/>
					<li><code>static ::com::sun::star::uno::Sequence< ::rtl::OUString > getSupportedServiceNames_Static()</code><li/>
					<li><code>static ::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface >
						Create(const ::com::sun::star::uno::Reference< ::com::sun::star::lang::XMultiServiceFactory >&)</code>
						</li>
				<ul/>
			the instantiation of this object will automatically register the class via <method>OModule::registerComponent</method>.
			<p/>
			The factory creation function used is <code>::cppu::createOneInstanceFactory</code>.
			@see OOneInstanceAutoRegistration
		*/
		OOneInstanceAutoRegistration();
		~OOneInstanceAutoRegistration();
	};

	template <class TYPE>
	OOneInstanceAutoRegistration<TYPE>::OOneInstanceAutoRegistration()
	{
		OModule::registerComponent(
			TYPE::getImplementationName_Static(),
			TYPE::getSupportedServiceNames_Static(),
			TYPE::Create,
			::cppu::createOneInstanceFactory
			);
	}

	template <class TYPE>
	OOneInstanceAutoRegistration<TYPE>::~OOneInstanceAutoRegistration()
	{
		OModule::revokeComponent(TYPE::getImplementationName_Static());
	}

//.........................................................................
}	// namespace COMPMOD_NAMESPACE
//.........................................................................

#endif // _EXTENSIONS_COMPONENT_MODULE_HXX_