printerfactory.h

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// PrinterFactory.h - Morpheus component code base

#if !defined(APDK_PRINTERFACTORY_H)
    #define APDK_PRINTERFACTORY_H

#include "printerproxy.h"           // the factory has to know about the proxies

APDK_BEGIN_NAMESPACE

typedef const void* FAMILY_HANDLE;
typedef MODEL_HANDLE PRINTER_HANDLE;

#define pPFI PrinterFactory::GetInstance()

//PrinterFactory
//! Provides the interface to enumerate models and create printer classes
/*!
PrinterFactory is a singleton that allows the caller to enumerate:
\li Families supported
\li Models supported within a family
\li Printers supported in the factory

Callers use the factory to create the appropriate printer class based on
familiy name, model name, or device ID string.
******************************************************************************/
class PrinterFactory
{
	friend class dummy;
public:
    // public API

    // get class related information
    inline static const PrinterFactory* GetInstance() { return s_Instance; }
    inline const unsigned int GetPrinterCount() const { return s_uPrinterCount; }
    inline const unsigned int GetFamilyCount() const { return s_uFamilyCount; }


    // enumerate Family APIs
    FAMILY_HANDLE StartFamilyNameEnum() const { return NULL; }
    const char* GetNextFamilyName(FAMILY_HANDLE& theFamilyHandle) const;

    // enumerate models in a family APIs
    inline MODEL_HANDLE StartModelNameEnum(FAMILY_HANDLE theFamilyHandle) const;
    const char* GetNextModelName(FAMILY_HANDLE theFamilyHandle, MODEL_HANDLE& theModelHandle) const;

    // enumerate all printers in factroy APIs
    PRINTER_HANDLE StartPrinterNameEnum() const { return NULL; }
    const char* GetNextPrinterName(PRINTER_HANDLE& thePrinterHandle) const;

    // get family name based on printer name
    const char* GetFamilyName(const char* thePrinterName) const;
    const char* GetFamilyName(const FAMILY_HANDLE theFamilyHandle) const;
	const PRINTER_TYPE GetFamilyType(const FAMILY_HANDLE theFamilyHandle) const;
	const PRINTER_TYPE EnumDevices( FAMILY_HANDLE& theFamilyHandle) const;
	const unsigned int GetModelBits() const;
	const void GetModelString(char* modelstring) const;

    // get a handle to family based on device string
//    const FAMILY_HANDLE FindModelMatch(const char* szModel) const;
    const FAMILY_HANDLE FindDevIdMatch(const char* szDevIdString) const;

    // Printer (un)registration and creation APIs
    static void Register(const PrinterProxy* thePrinterProxy);
    static void UnRegister(const PrinterProxy* thePrinterProxy);
    inline Printer* CreatePrinter(SystemServices* pSys, const FAMILY_HANDLE& theFamilyHandle) const;

private:
    // constructors/destructor - Only the factory can construct or destruct itself
    PrinterFactory();
    ~PrinterFactory();                              // doesn't need to be virtual - there is only one
    PrinterFactory(const PrinterFactory& theFactory) {}; // dont' let the compiler generate a copy constructor

    // Only available to factory manager
    struct ProxyListElement
    {
        const PrinterProxy* printerProxyElement;
        ProxyListElement* next;
    };

    inline const ProxyListElement* getProxyListElement(FAMILY_HANDLE theFamilyHandle) const;
    inline const PrinterProxy* getPrinterProxy(FAMILY_HANDLE theFamilyHandle) const;
    bool nextPrinter(FAMILY_HANDLE& theFamilyHandle, MODEL_HANDLE& theModelHandle) const;
    bool nextFamily(FAMILY_HANDLE& theFamilyHandle) const;

    static PrinterFactory* s_Instance;
    static ProxyListElement* s_ProxyList;

    static unsigned int s_uPrinterCount;
    static unsigned int s_uFamilyCount;

}; //PrinterFactory


//getProxyListElement
//! Return the the correct ProxyListELement based on the FAMILY_HANDLE
inline const PrinterFactory::ProxyListElement* PrinterFactory::getProxyListElement
(
    const FAMILY_HANDLE theFamilyHandle
) const
{
    return reinterpret_cast<const ProxyListElement*>(theFamilyHandle);
}


//getPrinterProxy
//! Return the correct PrinterProxy based on the FAMILY_HANDLE
inline const PrinterProxy* PrinterFactory::getPrinterProxy
(
    const FAMILY_HANDLE theFamilyHandle
) const
{
    return theFamilyHandle ? getProxyListElement(theFamilyHandle)->printerProxyElement : NULL;
} //GetPrinterPoxy


//StartModelNameEnum
//! Prepare for a Model Name enumeration based on a family
inline MODEL_HANDLE PrinterFactory::StartModelNameEnum
(
    const FAMILY_HANDLE theFamilyHandle
) const
{
    return getPrinterProxy(theFamilyHandle)->StartModelNameEnum();
} //StartModelNameEnum


//GetFamilyName
//! Get the family name string based on the family handel
inline const char* PrinterFactory::GetFamilyName
(
    const FAMILY_HANDLE theFamilyHandle     //!< handle to the family
) const
{
    return getPrinterProxy(theFamilyHandle)->GetFamilyName();
} //GetFamilyName

//GetFamilyType
//! Get the family printer type enum based on the family handel
inline const PRINTER_TYPE PrinterFactory::GetFamilyType
(
    const FAMILY_HANDLE theFamilyHandle     //!< handle to the family
) const
{
    return getPrinterProxy(theFamilyHandle)->GetPrinterType();
} //GetFamilyName



//CreatePrinter
//! Create a printer class based on the family handle
inline Printer* PrinterFactory::CreatePrinter
(
    SystemServices* pSys,                   //!< pointer to a valid SystemSerivce object
    const FAMILY_HANDLE& theFamilyHandle    //!< handle to the family to support
) const
{
    return theFamilyHandle ? getPrinterProxy(theFamilyHandle)->CreatePrinter(pSys) : NULL;
} //CreatePrinter

APDK_END_NAMESPACE

#endif //APDK_PRINTERFACTORY_H