// <summary>
// Determine whether the given CLR type is legal for an ObjectParameter or constant
// DbExpression.
// </summary>
private bool TryGetTypeUsageForTerminal(Expression expression, out TypeUsage typeUsage)
{
DebugCheck.NotNull(expression);
var type = expression.Type;
if (_rootContext.Perspective.TryGetTypeByName(
TypeSystem.GetNonNullableType(type).FullNameWithNesting(),
false, // bIgnoreCase
out typeUsage)
&&
(TypeSemantics.IsScalarType(typeUsage)))
{
if (expression.NodeType == ExpressionType.Convert)
{
type = ((UnaryExpression)expression).Operand.Type;
}
if (type.IsValueType &&
Nullable.GetUnderlyingType(type) == null &&
TypeSemantics.IsNullable(typeUsage))
{
typeUsage = typeUsage.ShallowCopy(
new FacetValues
{
Nullable = false
});
}
return(true);
}
typeUsage = null;
return(false);
}
// <summary>
// Determine whether the given CLR type is legal for an ObjectParameter or constant
// DbExpression.
// </summary>
private bool TryGetTypeUsageForTerminal(Type type, out TypeUsage typeUsage)
{
DebugCheck.NotNull(type);
if (_rootContext.Perspective.TryGetTypeByName(
TypeSystem.GetNonNullableType(type).FullNameWithNesting(),
false, // bIgnoreCase
out typeUsage)
&&
(TypeSemantics.IsScalarType(typeUsage)))
{
if (type.IsValueType &&
Nullable.GetUnderlyingType(type) == null &&
TypeSemantics.IsNullable(typeUsage))
{
typeUsage = typeUsage.ShallowCopy(
new FacetValues
{
Nullable = false
});
}
return(true);
}
typeUsage = null;
return(false);
}
internal DbExpression(DbExpressionKind kind, TypeUsage type, bool forceNullable = true)
{
DbExpression.CheckExpressionKind(kind);
this._kind = kind;
if (forceNullable && !TypeSemantics.IsNullable(type))
{
type = type.ShallowCopy(new FacetValues()
{
Nullable = (FacetValueContainer <bool?>) new bool?(true)
});
}
this._type = type;
}
internal DbExpression(DbExpressionKind kind, TypeUsage type)
{
CheckExpressionKind(kind);
_kind = kind;
Debug.Assert(type != null, string.Format(CultureInfo.InvariantCulture, "{0}.Type is null in DbExpression constructor", this.GetType().Name));
if (!TypeSemantics.IsNullable(type))
{
type = type.ShallowCopy(new FacetValues {
Nullable = true
});
}
Debug.Assert(type.IsReadOnly, "Editable type metadata specified for DbExpression.Type");
this._type = type;
}
internal DbExpression(DbExpressionKind kind, TypeUsage type, bool forceNullable = true)
{
CheckExpressionKind(kind);
_kind = kind;
DebugCheck.NotNull(type);
if (forceNullable && !TypeSemantics.IsNullable(type))
{
type = type.ShallowCopy(
new FacetValues
{
Nullable = true
});
}
Debug.Assert(type.IsReadOnly, "Editable type metadata specified for DbExpression.Type");
_type = type;
}
private bool TryGetTypeUsageForTerminal(Expression expression, out TypeUsage typeUsage)
{
Type type = expression.Type;
if (this._rootContext.Perspective.TryGetTypeByName(TypeSystem.GetNonNullableType(type).FullNameWithNesting(), false, out typeUsage) && TypeSemantics.IsScalarType(typeUsage))
{
if (expression.NodeType == ExpressionType.Convert)
{
type = ((UnaryExpression)expression).Operand.Type;
}
if (type.IsValueType && Nullable.GetUnderlyingType(type) == (Type)null && TypeSemantics.IsNullable(typeUsage))
{
typeUsage = typeUsage.ShallowCopy(new FacetValues()
{
Nullable = (FacetValueContainer <bool?>) new bool?(false)
});
}
return(true);
}
typeUsage = (TypeUsage)null;
return(false);
}
// This will update the sentinel values in the facets if required
private static void UpdateSentinelValuesInFacets(ref TypeUsage typeUsage)
{
// For string and decimal types, replace the sentinel by the max possible value
var primitiveType = (PrimitiveType)typeUsage.EdmType;
if (primitiveType.PrimitiveTypeKind == PrimitiveTypeKind.String
||
primitiveType.PrimitiveTypeKind == PrimitiveTypeKind.Binary)
{
var maxLengthFacet = typeUsage.Facets[DbProviderManifest.MaxLengthFacetName];
if (Helper.IsUnboundedFacetValue(maxLengthFacet))
{
typeUsage = typeUsage.ShallowCopy(
new FacetValues
{
MaxLength = Helper.GetFacet(
primitiveType.FacetDescriptions,
DbProviderManifest.MaxLengthFacetName).MaxValue
});
}
}
}
// <summary>
// Determine whether the given CLR type is legal for an ObjectParameter or constant
// DbExpression.
// </summary>
private bool TryGetTypeUsageForTerminal(Expression expression, out TypeUsage typeUsage)
{
DebugCheck.NotNull(expression);
var type = expression.Type;
if (_rootContext.Perspective.TryGetTypeByName(
TypeSystem.GetNonNullableType(type).FullNameWithNesting(),
false, // bIgnoreCase
out typeUsage)
&&
(TypeSemantics.IsScalarType(typeUsage)))
{
if (expression.NodeType == ExpressionType.Convert)
{
type = ((UnaryExpression)expression).Operand.Type;
}
if (type.IsValueType
&& Nullable.GetUnderlyingType(type) == null
&& TypeSemantics.IsNullable(typeUsage))
{
typeUsage = typeUsage.ShallowCopy(
new FacetValues
{
Nullable = false
});
}
return true;
}
typeUsage = null;
return false;
}
