nsigenericfactory.h

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    PRUint32                                    mFlags;
};


/** Module Callbacks **/


/** 
 * nsModuleConstructorProc
 *      
 * This function is called when the module is first being constructed.
 * @param self module which is being constructed.
 * 
 * @return NS_OK        Construction successful.
 *         NS_ERROR*    Method failure which will result in module not being 
 *                      loaded. 
 **/
typedef nsresult (PR_CALLBACK *nsModuleConstructorProc) (nsIModule *self);


/** 
 * nsModuleDestructorProc
 *      
 * This function is called when the module is being destroyed.
 * @param self module which is being destroyed.
 * 
 **/
typedef void (PR_CALLBACK *nsModuleDestructorProc) (nsIModule *self);

/**
 * nsModuleInfo
 *
 * Use this structure to define meta-information about the module
 * itself, including the name, its components, and an optional
 * module-level initialization or shutdown routine.
 *
 * @param mVersion     : Module Info Version
 * @param mModuleName  : Module Name
 * @param mComponents  : Array of Components
 * @param mCount       : Count of mComponents
 * @param mCtor        : Module user defined constructor
 * @param mDtor        : Module user defined destructor
 * @param mLibraryDependencies : array of library which this module is 
 *                               dependent on. 
 *
 **/

struct nsModuleInfo {
    PRUint32                mVersion;
    const char*             mModuleName;
    const nsModuleComponentInfo*  mComponents;
    PRUint32                mCount;
    nsModuleConstructorProc mCtor;
    nsModuleDestructorProc  mDtor;
    const char**            mLibraryDependencies;
};

/**
 * Rev this if you change the nsModuleInfo, and are worried about
 * binary compatibility. (Ostensibly fix NS_NewGenericModule2() to deal
 * with older rev's at the same time.)
 */
#define NS_MODULEINFO_VERSION 0x00015000UL // 1.5

/**
 * Create a new generic module. Use the NS_IMPL_NSGETMODULE macro, or
 * one of its relatives, rather than using this directly.
 */
NS_COM nsresult
NS_NewGenericModule2(nsModuleInfo *info, nsIModule* *result);

/**
 * Obsolete. Use NS_NewGenericModule2() instead.
 */
NS_COM nsresult
NS_NewGenericModule(const char* moduleName,
                    PRUint32 componentCount,
                    nsModuleComponentInfo* components,
                    nsModuleDestructorProc dtor,
                    nsIModule* *result);

#if defined(XPCOM_TRANSLATE_NSGM_ENTRY_POINT)
#  define NSMODULEINFO(_name)             _name##_gModuleInfo
#  define NSGETMODULE_ENTRY_POINT(_info)
#  define NSDEPENDENT_LIBS(_name)         const char* _name##_gDependlibs[]={DEPENDENT_LIBS "\0"};
#  define NSDEPENDENT_LIBS_NAME(_name)    _name##_gDependlibs
#else
#  define NSMODULEINFO(_name)             gModuleInfo
#  define NSDEPENDENT_LIBS(_name)         const char* gDependlibs[]={DEPENDENT_LIBS "\0"};
#  define NSDEPENDENT_LIBS_NAME(_name)    gDependlibs
#  define NSGETMODULE_ENTRY_POINT(_info)                                      \
extern "C" NS_EXPORT nsresult                                                 \
NSGetModule(nsIComponentManager *servMgr,                                     \
            nsIFile* location,                                                \
            nsIModule** result)                                               \
{                                                                             \
    return NS_NewGenericModule2(&(_info), result);                            \
}
#endif

/** 
 * Ease of use Macros which define NSGetModule for your component. 
 * See xpcom/sample/nsSampleModule.cpp for more info.
 *
 **/

#define NS_IMPL_NSGETMODULE(_name, _components)                               \
    NS_IMPL_NSGETMODULE_WITH_CTOR_DTOR(_name, _components, nsnull, nsnull)

#define NS_IMPL_NSGETMODULE_WITH_CTOR(_name, _components, _ctor)              \
    NS_IMPL_NSGETMODULE_WITH_CTOR_DTOR(_name, _components, _ctor, nsnull)

#define NS_IMPL_NSGETMODULE_WITH_DTOR(_name, _components, _dtor)              \
    NS_IMPL_NSGETMODULE_WITH_CTOR_DTOR(_name, _components, nsnull, _dtor)

#ifndef DEPENDENT_LIBS

#define NS_IMPL_NSGETMODULE_WITH_CTOR_DTOR(_name, _components, _ctor, _dtor)  \
nsModuleInfo NSMODULEINFO(_name) = {                                          \
    NS_MODULEINFO_VERSION,                                                    \
    (#_name),                                                                 \
    (_components),                                                            \
    (sizeof(_components) / sizeof(_components[0])),                           \
    (_ctor),                                                                  \
    (_dtor),                                                                  \
    (nsnull)                                                                  \
};                                                                            \
NSGETMODULE_ENTRY_POINT(NSMODULEINFO(_name))

#else // DEPENDENT_LIBS

#define NS_IMPL_NSGETMODULE_WITH_CTOR_DTOR(_name, _components, _ctor, _dtor)  \
NSDEPENDENT_LIBS(_name)                                                       \
nsModuleInfo NSMODULEINFO(_name) = {                                          \
    NS_MODULEINFO_VERSION,                                                    \
    (#_name),                                                                 \
    (_components),                                                            \
    (sizeof(_components) / sizeof(_components[0])),                           \
    (_ctor),                                                                  \
    (_dtor),                                                                  \
    (NSDEPENDENT_LIBS_NAME(_name))                                            \
};                                                                            \
NSGETMODULE_ENTRY_POINT(NSMODULEINFO(_name))

#endif

////////////////////////////////////////////////////////////////////////////////

#define NS_GENERIC_FACTORY_CONSTRUCTOR(_InstanceClass)                        \
static NS_IMETHODIMP                                                          \
_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID,               \
                            void **aResult)                                   \
{                                                                             \
    nsresult rv;                                                              \
                                                                              \
    _InstanceClass * inst;                                                    \
                                                                              \
    *aResult = NULL;                                                          \
    if (NULL != aOuter) {                                                     \
        rv = NS_ERROR_NO_AGGREGATION;                                         \
        return rv;                                                            \
    }                                                                         \
                                                                              \
    NS_NEWXPCOM(inst, _InstanceClass);                                        \
    if (NULL == inst) {                                                       \
        rv = NS_ERROR_OUT_OF_MEMORY;                                          \
        return rv;                                                            \
    }                                                                         \
    NS_ADDREF(inst);                                                          \
    rv = inst->QueryInterface(aIID, aResult);                                 \
    NS_RELEASE(inst);                                                         \
                                                                              \
    return rv;                                                                \
}                                                                             \


#define NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(_InstanceClass, _InitMethod)      \
static NS_IMETHODIMP                                                          \
_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID,               \
                            void **aResult)                                   \
{                                                                             \
    nsresult rv;                                                              \
                                                                              \
    _InstanceClass * inst;                                                    \
                                                                              \
    *aResult = NULL;                                                          \
    if (NULL != aOuter) {                                                     \
        rv = NS_ERROR_NO_AGGREGATION;                                         \
        return rv;                                                            \
    }                                                                         \
                                                                              \
    NS_NEWXPCOM(inst, _InstanceClass);                                        \
    if (NULL == inst) {                                                       \
        rv = NS_ERROR_OUT_OF_MEMORY;                                          \
        return rv;                                                            \
    }                                                                         \
    NS_ADDREF(inst);                                                          \
	rv = inst->_InitMethod();                                                 \
    if(NS_SUCCEEDED(rv)) {                                                    \
        rv = inst->QueryInterface(aIID, aResult);                             \
    }                                                                         \
    NS_RELEASE(inst);                                                         \
                                                                              \
    return rv;                                                                \
}                                                                             \

// 'Constructor' that uses an existing getter function that gets a singleton.
// NOTE: assumes that getter does an AddRef - so additional AddRef is not done.
#define NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(_InstanceClass, _GetterProc) \
static NS_IMETHODIMP                                                          \
_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID,               \
                            void **aResult)                                   \
{                                                                             \
    nsresult rv;                                                              \
                                                                              \
    _InstanceClass * inst;                                                    \
                                                                              \
    *aResult = NULL;                                                          \
    if (NULL != aOuter) {                                                     \
        rv = NS_ERROR_NO_AGGREGATION;                                         \
        return rv;                                                            \
    }                                                                         \
                                                                              \
    inst = _GetterProc();                                                     \
    if (NULL == inst) {                                                       \
        rv = NS_ERROR_OUT_OF_MEMORY;                                          \
        return rv;                                                            \
    }                                                                         \
    /* NS_ADDREF(inst); */                                                    \
    rv = inst->QueryInterface(aIID, aResult);                                 \
    NS_RELEASE(inst);                                                         \
                                                                              \
    return rv;                                                                \
}                                                                             \

#endif /* nsIGenericFactory_h___ */