352 lines
10 KiB
C
352 lines
10 KiB
C
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#ifndef __OBJACCES_H__
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#define __OBJACCES_H__
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#include <wbemint.h>
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#include <wstring.h>
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#include <comutl.h>
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#include <arrtempl.h>
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#include <unk.h>
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#include <map>
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#include <vector>
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#include <set>
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#include <wstlallc.h>
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#include "wmimsg.h"
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typedef CWbemPtr<_IWmiObject> _IWmiObjectP;
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typedef std::vector< _IWmiObjectP, wbem_allocator<_IWmiObjectP> > ObjectArray;
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/****************************************************************************
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CPropAccessor - base class for all prop accessors. Property Accessors are
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passed back from the GetPropHandle() method of IWmiObjectAccessFactory.
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*****************************************************************************/
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class CPropAccessor : public CUnk
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{
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protected:
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//
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// if the object we're accessing is not a top level object, then we'll
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// have a parent accessor to get it. Cannot hold reference here,
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// because in some cases the parent may hold a reference on the child and
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// we'd have a circular reference. It will not be possible though for a
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// parent to be deleted out from the child.
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//
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CPropAccessor* m_pParent;
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//
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// Accessor to delegate to. Sometimes, once a prop accessor is
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// handed out, we learn more about the property ( e.g. its type )
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// and it would be beneficial to have the original accessor delegate
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// to a more efficient one. we don't hold a reference here because
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// the delegate will assume ownership of this object and will hold
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// a reference on it. Holding a reference to the delegate would cause
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// a circular reference.
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//
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CPropAccessor* m_pDelegateTo;
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//
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// whenever a prop accessor is replaced by a more efficient one, it
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// is removed from the map. Since the map holds onto the ref that
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// keeps the accessor alive, we need to the new accessor be responsible
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// for cleaning up the original one. The original one is potentially
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// still being used by the client ( but now delegates to the new accessor )
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// ane we have to keep it alive for the lifetime of the access factory.
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//
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CWbemPtr<CPropAccessor> m_pResponsibleFor;
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//
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// level of the property - 0 means its a property on a top level object.
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//
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int m_nLevel;
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HRESULT GetParentObject( ObjectArray& raObjects, _IWmiObject** ppParent );
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void* GetInterface( REFIID ) { return NULL; }
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public:
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CPropAccessor( CPropAccessor* pParent )
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: m_pParent( pParent ), m_pDelegateTo( NULL )
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{
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if ( pParent == NULL )
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m_nLevel = 0;
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else
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m_nLevel = pParent->GetLevel() + 1;
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}
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int GetLevel() const { return m_nLevel; }
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CPropAccessor* GetParent() { return m_pParent; }
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enum AccessorType_e { e_Simple, e_Fast, e_Embedded };
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virtual ~CPropAccessor() {}
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virtual HRESULT GetProp( ObjectArray& raObjects,
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DWORD dwFlags,
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VARIANT* pvar,
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CIMTYPE* pct ) = 0;
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virtual HRESULT PutProp( ObjectArray& raObjects,
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DWORD dwFlags,
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VARIANT* pvar,
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CIMTYPE ct ) = 0;
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virtual AccessorType_e GetType() = 0;
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void AssumeOwnership( CPropAccessor* pAccessor )
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{
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m_pResponsibleFor = pAccessor;
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}
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void DelegateTo( CPropAccessor* pAccessor )
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{
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m_pDelegateTo = pAccessor;
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}
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};
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typedef CWbemPtr<CPropAccessor> CPropAccessorP;
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typedef std::map< WString,
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CPropAccessorP,
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WSiless,
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wbem_allocator<CPropAccessorP> > PropAccessMap;
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/*****************************************************************************
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CEmbeddedPropAccessor - accessor for an embedded object property.
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This impl caches the embedded object that is accessed to optimize
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subsequent accesses.
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******************************************************************************/
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class CEmbeddedPropAccessor : public CPropAccessor
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{
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//
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// name of the embedded object property.
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//
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WString m_wsName;
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//
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// the index in the object array where the embedded obj will be cached
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// when accessed for the first time.
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//
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long m_lObjIndex;
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//
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// child accessors for the embedded object.
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//
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PropAccessMap m_mapPropAccess;
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friend class CObjectAccessFactory;
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public:
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CEmbeddedPropAccessor( LPCWSTR wszName,
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long lObjIndex,
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CPropAccessor* pParent = NULL )
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: CPropAccessor( pParent ), m_wsName( wszName ), m_lObjIndex( lObjIndex )
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{
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}
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HRESULT GetProp( ObjectArray& raObjects,
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DWORD dwFlags,
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VARIANT* pvar,
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CIMTYPE* pct );
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HRESULT PutProp( ObjectArray& raObjects,
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DWORD dwFlags,
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VARIANT* pvar,
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CIMTYPE ct );
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AccessorType_e GetType() { return e_Embedded; }
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int GetObjectIndex() { return m_lObjIndex; }
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};
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/*****************************************************************************
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CSimplePropAccessor - simple accessor for non-embedded object properties.
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******************************************************************************/
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class CSimplePropAccessor : public CPropAccessor
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{
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//
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// name of the embedded object property.
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//
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WString m_wsName;
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public:
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CSimplePropAccessor( LPCWSTR wszName, CPropAccessor* pParent = NULL )
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: CPropAccessor( pParent ), m_wsName( wszName ) { }
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HRESULT GetProp( ObjectArray& raObjects,
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DWORD dwFlags,
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VARIANT* pvar,
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CIMTYPE* pct );
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HRESULT PutProp( ObjectArray& raObjects,
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DWORD dwFlags,
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VARIANT* pvar,
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CIMTYPE ct );
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AccessorType_e GetType() { return e_Simple; }
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};
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/*****************************************************************************
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CFastPropAccessor - fast accessor base for non-embedded object properties.
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Is used when the type of the property is known at property handle creation.
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******************************************************************************/
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class CFastPropAccessor : public CPropAccessor
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{
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protected:
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long m_lHandle;
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CIMTYPE m_ct;
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public:
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CFastPropAccessor( long lHandle, CIMTYPE ct, CPropAccessor* pParent=NULL )
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: CPropAccessor( pParent ), m_lHandle( lHandle ), m_ct( ct ) { }
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HRESULT GetProp( ObjectArray& raObjects,
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DWORD dwFlags,
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VARIANT* pvar,
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CIMTYPE* pct );
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HRESULT PutProp( ObjectArray& raObjects,
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DWORD dwFlags,
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VARIANT* pvar,
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CIMTYPE ct );
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AccessorType_e GetType() { return e_Fast; }
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virtual HRESULT ReadValue( _IWmiObject* pObj, VARIANT* pvar ) = 0;
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virtual HRESULT WriteValue( _IWmiObject* pObj, VARIANT* pvar ) = 0;
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};
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/*****************************************************************************
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CStringPropAccessor
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******************************************************************************/
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class CStringPropAccessor : public CFastPropAccessor
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{
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public:
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CStringPropAccessor( long lHandle, CIMTYPE ct, CPropAccessor* pParent=NULL)
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: CFastPropAccessor( lHandle, ct, pParent ) { }
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HRESULT ReadValue( _IWmiObject* pObj, VARIANT* pvar );
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HRESULT WriteValue( _IWmiObject* pObj, VARIANT* pvar );
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};
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/****************************************************************************
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CObjectAccessFactory - impl for IWmiObjectAccessFactory
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*****************************************************************************/
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class CObjectAccessFactory
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: public CUnkBase<IWmiObjectAccessFactory, &IID_IWmiObjectAccessFactory>
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{
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_IWmiObjectP m_pTemplate;
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PropAccessMap m_mapPropAccess;
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long m_lIndexGenerator;
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HRESULT FindOrCreateAccessor( LPCWSTR wszPropElem,
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BOOL bEmbedded,
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CPropAccessor* pParent,
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CPropAccessor** ppAccessor );
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public:
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CObjectAccessFactory( CLifeControl* pControl )
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: CUnkBase<IWmiObjectAccessFactory,&IID_IWmiObjectAccessFactory>(pControl),
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m_lIndexGenerator(1)
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{
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}
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STDMETHOD(SetObjectTemplate)( IWbemClassObject* pTemplate );
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STDMETHOD(GetObjectAccess)( IWmiObjectAccess** ppAccess );
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STDMETHOD(GetPropHandle)( LPCWSTR wszProp, DWORD dwFlags, LPVOID* ppHdl );
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};
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/****************************************************************************
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CObjectAccess - impl for IWmiObjectAccess.
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*****************************************************************************/
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class CObjectAccess : public CUnkBase<IWmiObjectAccess,&IID_IWmiObjectAccess>
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{
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ObjectArray m_aObjects;
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class CEmbeddedPropAccessorCompare
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{
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public:
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bool operator() ( const CEmbeddedPropAccessor* pA,
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const CEmbeddedPropAccessor* pB ) const
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{
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bool bRet;
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if ( !(pA == pB) )
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if ( pA->GetLevel() == pB->GetLevel() )
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bRet = pA < pB;
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else
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bRet = pA->GetLevel() > pB->GetLevel();
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else
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bRet = FALSE;
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return bRet;
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}
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};
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typedef std::set< CEmbeddedPropAccessor*,
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CEmbeddedPropAccessorCompare,
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wbem_allocator<CEmbeddedPropAccessor*> > EmbeddedPropAccessSet;
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EmbeddedPropAccessSet m_setEmbeddedAccessorsToCommit;
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public:
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CObjectAccess( CLifeControl* pControl )
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: CUnkBase<IWmiObjectAccess,&IID_IWmiObjectAccess> ( pControl ) {}
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STDMETHOD(SetObject)( IWbemClassObject* pObj );
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STDMETHOD(GetObject)( IWbemClassObject** ppObj );
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//
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// should support flags that describe what is going to be done
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// with the value. If it's going to be put into another object then
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// we'll give back a value which can only be used for that purpose. More
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// efficient. e.g. we could use the get/put prop pointer methods
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//
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STDMETHOD(GetProp)( LPVOID pHdl,
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DWORD dwFlags,
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VARIANT* pvar,
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CIMTYPE* pct );
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STDMETHOD(PutProp)( LPVOID pHdl,
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DWORD dwFlags,
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VARIANT* pvar,
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CIMTYPE ct );
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STDMETHOD(CommitChanges)();
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};
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#endif // __OBJACCES_H__
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