138 lines
4.2 KiB
C++
138 lines
4.2 KiB
C++
//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1997 - 1999.
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//
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// File: accbase.hxx
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//
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// Class: CAccessorBase
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//
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// Purpose: Base class for CAccessor and CDistributedAccessor. Handles
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// accessor refcount, type, and tracks # of current rowsets
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// have an inherited copy of the accessor.
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//
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// History: 22 Apr 1997 emilyb created
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//
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//--------------------------------------------------------------------------
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#pragma once
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#include <tbag.hxx>
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class CAccessorBase
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{
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public:
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enum EAccessorType {
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eInvalidAccessor,
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eRowDataAccessor,
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eParamsDataAccessor,
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};
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CAccessorBase (void * pCreator, EAccessorType eType) :
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_pCreator(pCreator), _hAccessorParent(0),
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_type(eType), _cRef(1),
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_cInheritors(0) {}
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virtual ~CAccessorBase() {}
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void * GetCreator() {return _pCreator;}
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virtual ULONG AddRef()
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{
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return InterlockedIncrement( (LONG *) &_cRef );
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}
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virtual ULONG Release()
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{
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// CAccessorBag does the destroy
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return InterlockedDecrement( (LONG *) &_cRef );
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}
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ULONG GetRefcount() { return _cRef; }
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BOOL IsValidType() const { return _type == eRowDataAccessor ||
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_type == eParamsDataAccessor; }
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void SetInvalid( void ) { _type = eInvalidAccessor; };
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EAccessorType GetAccessorType() const { return _type; }
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BOOL IsRowDataAccessor() const { return eRowDataAccessor == _type; }
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CAccessorBase * GetParent() {return _hAccessorParent;}
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void SetParent(CAccessorBase * hParent) { _hAccessorParent = hParent;}
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ULONG IncInheritors() { return ++_cInheritors; }
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ULONG DecInheritors() { return --_cInheritors; }
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ULONG GetInheritorCount() { return _cInheritors; }
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virtual SCODE GetBindings( DBACCESSORFLAGS * pBindIo,
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DBCOUNTITEM * pcBindings,
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DBBINDING ** ppBindings) = 0 ;
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protected:
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ULONG _cRef;
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private:
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void *_pCreator; // this pointer of comamnd or rowset that
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// called CreateAccessor to create this accessor
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CAccessorBase * _hAccessorParent; // if this accessor was inherited from a command,
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// then the HACCESSOR of the original accessor
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ULONG _cInheritors; // count of current rowsets
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// which inherited this accessor
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EAccessorType _type;
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};
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//+-------------------------------------------------------------------------
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//
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// Class: CAccessorBag
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//
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// Purpose: Holds a number of accessors
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//
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// History: 12 Jan 1995 dlee Created
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//
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//--------------------------------------------------------------------------
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class CAccessorBag : public TBag<CAccessorBase *>
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{
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public:
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CAccessorBag(void * pOwner): _pOwner(pOwner) { }
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CAccessorBase * Convert(HACCESSOR hAccessor)
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{
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Win4Assert( 0 == DB_INVALID_HACCESSOR );
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if ( DB_INVALID_HACCESSOR == hAccessor )
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THROW( CException( DB_E_BADACCESSORHANDLE) );
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CAccessorBase * pAccBase = (CAccessorBase *) hAccessor;
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if (_pOwner != pAccBase->GetCreator())
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{ // see if we inherited
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pAccBase = First();
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while (pAccBase && (pAccBase->GetParent() != (CAccessorBase *)hAccessor ))
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pAccBase = Next();
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if (!pAccBase)
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THROW( CException( DB_E_BADACCESSORHANDLE ) );
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}
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if( !pAccBase->IsValidType() || pAccBase->GetRefcount() <= 0 )
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THROW( CException( DB_E_BADACCESSORHANDLE ) );
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return pAccBase;
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}
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~CAccessorBag();
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void AddRef( HACCESSOR hAccessor,
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ULONG *pcRef );
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void Release( HACCESSOR hAccessor,
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ULONG *pcRef );
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private:
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void Destroy( CAccessorBase * pAccessor );
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// This is the pointer of the rowset or command to which this bag belongs
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void * _pOwner;
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}; //CAccessorBag
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