internal static TypeUsage GetElementTypeUsage(TypeUsage type)
{
if (TypeSemantics.IsCollectionType(type))
{
return(((CollectionType)type.EdmType).TypeUsage);
}
else if (TypeSemantics.IsReferenceType(type))
{
return(TypeUsage.Create(((RefType)type.EdmType).ElementType));
}
return(null);
}
private static TypeUsage CreateResultType(RelationshipEndMember end)
{
TypeUsage typeUsage = end.TypeUsage;
if (!TypeSemantics.IsReferenceType(typeUsage))
{
typeUsage = TypeHelpers.CreateReferenceTypeUsage(TypeHelpers.GetEdmType <EntityType>(typeUsage));
}
if (RelationshipMultiplicity.Many == end.RelationshipMultiplicity)
{
typeUsage = TypeHelpers.CreateCollectionTypeUsage(typeUsage);
}
return(typeUsage);
}
internal static DbExpression FindNavigationExpression(
DbExpression expression,
AliasGenerator aliasGenerator,
out ObjectSpanRewriter.NavigationInfo navInfo)
{
navInfo = (ObjectSpanRewriter.NavigationInfo)null;
TypeUsage typeUsage = ((CollectionType)expression.ResultType.EdmType).TypeUsage;
if (!TypeSemantics.IsEntityType(typeUsage) && !TypeSemantics.IsReferenceType(typeUsage))
{
return(expression);
}
ObjectSpanRewriter.RelationshipNavigationVisitor navigationVisitor = new ObjectSpanRewriter.RelationshipNavigationVisitor(aliasGenerator);
DbExpression dbExpression = navigationVisitor.Find(expression);
if (object.ReferenceEquals((object)expression, (object)dbExpression))
{
return(expression);
}
navInfo = new ObjectSpanRewriter.NavigationInfo(navigationVisitor._original, navigationVisitor._rewritten);
return(dbExpression);
}
public override void Visit(SoftCastOp op, System.Data.Entity.Core.Query.InternalTrees.Node n)
{
PropertyRefList propertyRefs = (PropertyRefList)null;
if (TypeSemantics.IsReferenceType(op.Type))
{
propertyRefs = PropertyRefList.All;
}
else if (TypeSemantics.IsNominalType(op.Type))
{
propertyRefs = this.m_nodePropertyRefMap[n].Clone();
}
else if (TypeSemantics.IsRowType(op.Type))
{
propertyRefs = PropertyRefList.All;
}
if (propertyRefs != null)
{
this.AddPropertyRefs(n.Child0, propertyRefs);
}
this.VisitChildren(n);
}
private bool TryResolveAsRefPropertyAccess(
DbExpression valueExpr,
string name,
ErrorContext errCtx,
out DbExpression propertyExpr)
{
propertyExpr = (DbExpression)null;
if (!TypeSemantics.IsReferenceType(valueExpr.ResultType))
{
return(false);
}
DbExpression valueExpr1 = (DbExpression)valueExpr.Deref();
TypeUsage resultType = valueExpr1.ResultType;
if (this.TryResolveAsPropertyAccess(valueExpr1, name, out propertyExpr))
{
return(true);
}
string errorMessage = Strings.InvalidDeRefProperty((object)name, (object)resultType.EdmType.FullName, (object)valueExpr.ResultType.EdmType.FullName);
throw EntitySqlException.Create(errCtx, errorMessage, (Exception)null);
}
public override void Visit(ComparisonOp op, System.Data.Entity.Core.Query.InternalTrees.Node n)
{
TypeUsage type = (n.Child0.Op as ScalarOp).Type;
if (!TypeUtils.IsStructuredType(type))
{
this.VisitChildren(n);
}
else if (TypeSemantics.IsRowType(type) || TypeSemantics.IsReferenceType(type))
{
this.VisitDefault(n);
}
else
{
System.Data.Entity.Core.Query.PlanCompiler.PlanCompiler.Assert(TypeSemantics.IsEntityType(type), "unexpected childOpType?");
PropertyRefList identityProperties = PropertyPushdownHelper.GetIdentityProperties(TypeHelpers.GetEdmType <EntityType>(type));
foreach (System.Data.Entity.Core.Query.InternalTrees.Node child in n.Children)
{
this.AddPropertyRefs(child, identityProperties);
}
this.VisitChildren(n);
}
}
private static void RequireCompatibleType(
DbExpression from,
RelationshipEndMember end,
bool allowAllRelationshipsInSameTypeHierarchy)
{
TypeUsage typeUsage = end.TypeUsage;
if (!TypeSemantics.IsReferenceType(typeUsage))
{
typeUsage = TypeHelpers.CreateReferenceTypeUsage(TypeHelpers.GetEdmType <EntityType>(typeUsage));
}
if (allowAllRelationshipsInSameTypeHierarchy)
{
if (TypeHelpers.GetCommonTypeUsage(typeUsage, from.ResultType) == null)
{
throw new ArgumentException(Strings.Cqt_RelNav_WrongSourceType((object)typeUsage.ToString()), nameof(from));
}
}
else if (!TypeSemantics.IsStructurallyEqualOrPromotableTo(from.ResultType.EdmType, typeUsage.EdmType))
{
throw new ArgumentException(Strings.Cqt_RelNav_WrongSourceType((object)typeUsage.ToString()), nameof(from));
}
}
/// <summary>
/// If <paramref name="valueExpr" /> returns a reference, then deref and try resolving <paramref name="name" /> as a property of the dereferenced value.
/// </summary>
private bool TryResolveAsRefPropertyAccess(DbExpression valueExpr, string name, ErrorContext errCtx, out DbExpression propertyExpr)
{
DebugCheck.NotNull(valueExpr);
propertyExpr = null;
if (TypeSemantics.IsReferenceType(valueExpr.ResultType))
{
DbExpression derefExpr = valueExpr.Deref();
var derefExprType = derefExpr.ResultType;
if (TryResolveAsPropertyAccess(derefExpr, name, out propertyExpr))
{
return(true);
}
else
{
var message = Strings.InvalidDeRefProperty(name, derefExprType.EdmType.FullName, valueExpr.ResultType.EdmType.FullName);
throw EntitySqlException.Create(errCtx, message, null);
}
}
return(false);
}
internal DbEntityRefExpression(TypeUsage refResultType, DbExpression entity)
: base(DbExpressionKind.EntityRef, refResultType, entity)
{
Debug.Assert(TypeSemantics.IsReferenceType(refResultType), "DbEntityRefExpression requires a reference result type");
}
internal static Type GetClrTypeFromTypeMetadata(TypeUsage typeUsage)
{
PrimitiveType type;
return(!TypeHelpers.TryGetEdmType <PrimitiveType>(typeUsage, out type) ? (!TypeSemantics.IsReferenceType(typeUsage) ? (!TypeUtils.IsStructuredType(typeUsage) ? (!TypeUtils.IsCollectionType(typeUsage) ? (!TypeUtils.IsEnumerationType(typeUsage) ? typeof(object) : ((EnumType)typeUsage.EdmType).UnderlyingType.ClrEquivalentType) : typeof(DbDataReader)) : typeof(DbDataRecord)) : typeof(EntityKey)) : type.ClrEquivalentType);
}
internal static bool IsValidInOpType(TypeUsage typeUsage)
{
return(TypeSemantics.IsReferenceType(typeUsage) ||
TypeSemantics.IsEntityType(typeUsage) ||
TypeSemantics.IsScalarType(typeUsage));
}
