STDMETHODIMP RegMeta::EnumGenericParamConstraints(
HCORENUM *phEnum, // [IN|OUT] Pointer to the enum.
mdGenericParam tkOwner, // [IN] GenericParam whose constraints are requested
mdGenericParamConstraint rTokens[], // [OUT] Put GenericParamConstraints here.
ULONG cMaxTokens, // [IN] Max GenericParamConstraints to put.
ULONG *pcTokens) // [OUT] Put # of tokens here.
{
HRESULT hr = S_OK;
BEGIN_ENTRYPOINT_NOTHROW;
HENUMInternal **ppmdEnum = reinterpret_cast<HENUMInternal **> (phEnum);
ULONG ridStart;
ULONG ridEnd;
HENUMInternal *pEnum;
GenericParamConstraintRec *pRec;
ULONG index;
CMiniMdRW *pMiniMd = NULL;
LOG((LOGMD, "RegMeta::EnumGenericParamConstraints(0x%08x, 0x%08x, 0x%08x, 0x%08x, 0x%08x)\n",
phEnum, tkOwner, rTokens, cMaxTokens, pcTokens));
START_MD_PERF();
LOCKREAD();
pMiniMd = &(m_pStgdb->m_MiniMd);
if(TypeFromToken(tkOwner) != mdtGenericParam)
IfFailGo(META_E_BAD_INPUT_PARAMETER);
// See if this version of the metadata can do Generics
if (!pMiniMd->SupportsGenerics())
{
if (pcTokens)
*pcTokens = 0;
hr = S_FALSE;
goto ErrExit;
}
if ( *ppmdEnum == 0 )
{
// instantiating a new ENUM
//<TODO> GENERICS: review this. Are we expecting a sorted table or not? </TODO>
if ( pMiniMd->IsSorted( TBL_GenericParamConstraint ) )
{
IfFailGo(pMiniMd->getGenericParamConstraintsForGenericParam(RidFromToken(tkOwner), &ridEnd, &ridStart));
IfFailGo( HENUMInternal::CreateSimpleEnum(mdtGenericParamConstraint, ridStart, ridEnd, &pEnum) );
}
else
{
// table is not sorted so we have to create dynamic array
// create the dynamic enumerator
//
ridStart = 1;
ridEnd = pMiniMd->getCountGenericParamConstraints() + 1;
IfFailGo( HENUMInternal::CreateDynamicArrayEnum(mdtGenericParamConstraint, &pEnum));
for (index = ridStart; index < ridEnd; index ++ )
{
IfFailGo(pMiniMd->GetGenericParamConstraintRecord(index, &pRec));
if ( tkOwner == pMiniMd->getOwnerOfGenericParamConstraint(pRec))
{
IfFailGo( HENUMInternal::AddElementToEnum(pEnum, TokenFromRid(index,
mdtGenericParamConstraint)));
}
}
}
// set the output parameter
*ppmdEnum = pEnum;
}
else
{
pEnum = *ppmdEnum;
}
// fill the output token buffer
hr = HENUMInternal::EnumWithCount(pEnum, cMaxTokens, rTokens, pcTokens);
ErrExit:
HENUMInternal::DestroyEnumIfEmpty(ppmdEnum);
STOP_MD_PERF(EnumGenericParamConstraints);
END_ENTRYPOINT_NOTHROW;
return hr;
}
