_piclass.h

mini http server,可以集成嵌入到程序中,实现简单的web功能

/*____________________________________________________________________________*\
 *

 Copyright (c) 1997-2003 John Roy, Holger Zimmermann. All rights reserved.

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 FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
 as long as the following conditions are adhered to.

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    notice, this list of conditions and the following disclaimer. 

 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

 3. The name of the author may not be used to endorse or promote products
    derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 *____________________________________________________________________________*|
 *
 * $Source: /cvsroot/pi3web/Pi3Web_200/Source/Pi2API/_PIClass.h,v $
 * $Date: 2003/05/13 18:42:09 $
 *
 Description:
	Implementation of the PIAPI class class. This class doesn't do a lot by
	itself, mainly it serves to force the interfaces to the derived classes
	as well as having a virtual Destructor.

\*____________________________________________________________________________*/
/* $HeaderTop:$ */

#ifndef _PICLASS_H_
#define _PICLASS_H_

#include <assert.h>

#include "Pi2API.h"
#include "PIString.h"
#include "_PIDB.h"
#include "_PIDBKey.h"
#include "PIDLL.h"

/*____________________________________________________________________________*\
 *
 Class:
 Description:
\*____________________________________________________________________________*/
class _PIClass
{
public:
	enum Type { IO, LOGIC, SLL };

	enum Function {
		ON_CLASS_LOAD=0,
		CONSTRUCTOR,
		COPYCONSTRUCTOR,
		DESTRUCTOR,

		/* this must always be last */
		LAST_FUNCTION
		};
	typedef int (* PfnFunction)(void *, int, const char *[] );

private:
    PIDLL *pDll;
	PIString sName;
	PIString sDescription;
	PfnFunction aFunctionFrame[ LAST_FUNCTION ];

public:
    _PIClass(
        PIDLL *pTheDll,
        const char *pClassName,
        const char *pClassDescription,
        PfnFunction *pFunctions,
        _PIDB *pDB )
    :   pDll( pTheDll )
		{
        assert( pClassName && pClassDescription && pFunctions );
		memcpy( aFunctionFrame, pFunctions, sizeof( aFunctionFrame ) );
        sName = pClassName;
        sDescription = pClassDescription;
		onClassLoad( STARTUP, pDB );
		};

	virtual ~_PIClass()
		{
        onClassLoad( SHUTDOWN, 0 );
		};

	virtual Type GetType() const=0;

	virtual const char *GetClassName() const=0;
	
	/* --- accessor functions --- */
    inline const PIString &GetName() const          { return sName; };
    inline const PIString &GetDescription() const   { return sDescription; };
    inline PIDLL *GetLibrary() const                { return pDll; };

	/* --- Implement function calls --- */
	inline int onClassLoad( PIClass_LoadAction eLoadAction, _PIDB *pDB ) const
		{
			return (
				( int (*)( PIClass_LoadAction eLoadAction, _PIDB * ) )
				aFunctionFrame[ON_CLASS_LOAD] ) ( eLoadAction, pDB );
		};

	int Constructor( _PIObject *pObj, int iArgc, const char *ppArgv[] ) const;
	int CopyConstructor( _PIObject *pObj, int iArgc,
		const char *ppArgv[] ) const;
	int Destructor( _PIObject *pObj, int iArgc, const char *ppArgv[] ) const;

	/* --- static member functions */
	static const _PIClass *Lookup( _PIDB *pDB, const char *pClassName );
	static const _PIClass *Load( _PIDB *pDB, PIConfigDB *pConfigDB,
		const char *pClassName );
	static const _PIClass *LookupOrLoad( _PIDB *pDB, PIConfigDB *pConfigDB,
		const char *pClassName );

};

#endif	/* _PICLASS_H_ */