private IEnumerable<PropertyRef> GetPropertyRefs(TypeInfo typeInfo, OperationKind opKind)
{
PlanCompiler.Assert(opKind != OperationKind.All, "unexpected attempt to GetPropertyRefs(...,OperationKind.All)");
if (opKind == OperationKind.GetKeys)
{
return typeInfo.GetKeyPropertyRefs();
}
else if (opKind == OperationKind.GetIdentity)
{
return typeInfo.GetIdentityPropertyRefs();
}
else
{
return GetPropertyRefsForComparisonAndIsNull(typeInfo, opKind);
}
}
private IEnumerable<PropertyRef> GetPropertyRefsForComparisonAndIsNull(TypeInfo typeInfo, OperationKind opKind)
{
PlanCompiler.Assert(
opKind == OperationKind.IsNull || opKind == OperationKind.Equality,
"Unexpected opKind: " + opKind + "; Can only handle IsNull and Equality");
var currentType = typeInfo.Type;
md.RowType recordType = null;
if (TypeHelpers.TryGetEdmType(currentType, out recordType))
{
if (opKind == OperationKind.IsNull
&& typeInfo.HasNullSentinelProperty)
{
yield return NullSentinelPropertyRef.Instance;
}
else
{
foreach (var m in recordType.Properties)
{
if (!TypeUtils.IsStructuredType(md.Helper.GetModelTypeUsage(m)))
{
yield return new SimplePropertyRef(m);
}
else
{
var nestedTypeInfo = m_typeInfo.GetTypeInfo(md.Helper.GetModelTypeUsage(m));
foreach (var p in GetPropertyRefs(nestedTypeInfo, opKind))
{
var nestedPropertyRef = p.CreateNestedPropertyRef(m);
yield return nestedPropertyRef;
}
}
}
}
yield break;
}
md.EntityType entityType = null;
if (TypeHelpers.TryGetEdmType(currentType, out entityType))
{
if (opKind == OperationKind.Equality
||
(opKind == OperationKind.IsNull && !typeInfo.HasTypeIdProperty))
{
foreach (var p in typeInfo.GetIdentityPropertyRefs())
{
yield return p;
}
}
else
{
yield return TypeIdPropertyRef.Instance;
}
yield break;
}
md.ComplexType complexType = null;
if (TypeHelpers.TryGetEdmType(currentType, out complexType))
{
PlanCompiler.Assert(opKind == OperationKind.IsNull, "complex types not equality-comparable");
PlanCompiler.Assert(typeInfo.HasNullSentinelProperty, "complex type with no null sentinel property: can't handle isNull");
yield return NullSentinelPropertyRef.Instance;
yield break;
}
md.RefType refType = null;
if (TypeHelpers.TryGetEdmType(currentType, out refType))
{
foreach (var p in typeInfo.GetAllPropertyRefs())
{
yield return p;
}
yield break;
}
PlanCompiler.Assert(false, "Unknown type");
}