private MethodCallExpression CreateSelectExpression(Expression source)
{
if (_rootNavigationItem.HasNavigationItems())
{
return((MethodCallExpression)source);
}
if (_rootNavigationItem.AllSelected)
{
return((MethodCallExpression)source);
}
ParameterExpression parameter = _joinBuilder.Visitor.Parameter;
IReadOnlyList <OeStructuralSelectItem> structuralItems = _rootNavigationItem.GetStructuralItemsWithNotSelected();
var expressions = new Expression[structuralItems.Count];
for (int i = 0; i < expressions.Length; i++)
{
if (structuralItems[i].EdmProperty is ComputeProperty computeProperty)
{
expressions[i] = computeProperty.Expression;
}
else
{
PropertyInfo clrProperty = parameter.Type.GetPropertyIgnoreCase(structuralItems[i].EdmProperty);
expressions[i] = Expression.MakeMemberAccess(parameter, clrProperty);
}
}
NewExpression newTupleExpression = OeExpressionHelper.CreateTupleExpression(expressions);
LambdaExpression lambda = Expression.Lambda(newTupleExpression, parameter);
MethodInfo selectMethodInfo = OeMethodInfoHelper.GetSelectMethodInfo(parameter.Type, newTupleExpression.Type);
return(Expression.Call(selectMethodInfo, source, lambda));
}
public override OeEntryFactory CreateEntryFactory(IEdmEntitySet entitySet, Type clrType, OePropertyAccessor[]?skipTokenAccessors)
{
ParameterExpression parameter = Expression.Parameter(typeof(Object));
UnaryExpression typedParameter = Expression.Convert(parameter, clrType);
if (_rootNavigationItem.HasNavigationItems())
{
List <OeNavigationSelectItem> navigationItems = OeSelectTranslator.FlattenNavigationItems(_rootNavigationItem, true);
IReadOnlyList <MemberExpression> navigationProperties = OeExpressionHelper.GetPropertyExpressions(typedParameter);
int propertyIndex = navigationProperties.Count - 1;
for (int i = navigationItems.Count - 1; i >= 0; i--)
{
OeNavigationSelectItem navigationItem = navigationItems[i];
if (navigationItem.Kind == OeNavigationSelectItemKind.NotSelected)
{
propertyIndex--;
continue;
}
OePropertyAccessor[] accessors = Array.Empty <OePropertyAccessor>();
LambdaExpression? linkAccessor = null;
OeNavigationEntryFactory[] nestedNavigationLinks = Array.Empty <OeNavigationEntryFactory>();
if (navigationItem.Kind != OeNavigationSelectItemKind.NextLink)
{
accessors = GetAccessors(navigationProperties[propertyIndex].Type, navigationItem);
linkAccessor = Expression.Lambda(navigationProperties[propertyIndex], parameter);
nestedNavigationLinks = GetNestedNavigationLinks(navigationItem);
propertyIndex--;
}
if (i == 0)
{
navigationItem.EntryFactory = new OeEntryFactory(navigationItem.EntitySet, accessors, skipTokenAccessors, nestedNavigationLinks, linkAccessor);
}
else
{
navigationItem.EntryFactory = new OeNavigationEntryFactory(
navigationItem.EntitySet,
accessors,
skipTokenAccessors,
nestedNavigationLinks,
linkAccessor,
navigationItem.EdmProperty,
navigationItem.NavigationSelectItem,
navigationItem.Kind == OeNavigationSelectItemKind.NextLink);
}
}
}
else
{
var navigationLinks = new OeNavigationEntryFactory[_rootNavigationItem.NavigationItems.Count];
for (int i = 0; i < _rootNavigationItem.NavigationItems.Count; i++)
{
OeNavigationSelectItem navigationItem = _rootNavigationItem.NavigationItems[i];
navigationLinks[i] = new OeNavigationEntryFactory(
navigationItem.EntitySet,
Array.Empty <OePropertyAccessor>(),
null,
Array.Empty <OeNavigationEntryFactory>(),
null,
navigationItem.EdmProperty,
navigationItem.NavigationSelectItem,
navigationItem.Kind == OeNavigationSelectItemKind.NextLink);
}
OePropertyAccessor[] accessors = GetAccessors(clrType, _rootNavigationItem);
_rootNavigationItem.EntryFactory = new OeEntryFactory(_rootNavigationItem.EntitySet, accessors, skipTokenAccessors, navigationLinks);
}
return(_rootNavigationItem.EntryFactory);
}
private static Expression SelectStructuralProperties(Expression source, OeNavigationSelectItem root)
{
if (!root.HasNavigationItems())
{
return(source);
}
ParameterExpression parameter = Expression.Parameter(OeExpressionHelper.GetCollectionItemType(source.Type));
IReadOnlyList <MemberExpression> joins = OeExpressionHelper.GetPropertyExpressions(parameter);
var newJoins = new Expression[joins.Count];
List <OeNavigationSelectItem> navigationItems = FlattenNavigationItems(root, false);
bool isNavigationNullable = false;
for (int i = 0; i < navigationItems.Count; i++)
{
newJoins[i] = joins[i];
isNavigationNullable |= i > 0 && navigationItems[i].EdmProperty.Type.IsNullable;
if (!navigationItems[i].AllSelected)
{
IReadOnlyList <OeStructuralSelectItem> structuralItems = navigationItems[i].GetStructuralItemsWithNotSelected();
if (structuralItems.Count > 0)
{
var properties = new Expression[structuralItems.Count];
for (int j = 0; j < structuralItems.Count; j++)
{
if (structuralItems[j].EdmProperty is ComputeProperty computeProperty)
{
properties[j] = new ReplaceParameterVisitor(joins[i]).Visit(computeProperty.Expression);
}
else
{
PropertyInfo property = joins[i].Type.GetPropertyIgnoreCase(structuralItems[j].EdmProperty);
properties[j] = Expression.Property(joins[i], property);
}
}
Expression newTupleExpression = OeExpressionHelper.CreateTupleExpression(properties);
if (isNavigationNullable)
{
UnaryExpression nullConstant = Expression.Convert(OeConstantToVariableVisitor.NullConstantExpression, newTupleExpression.Type);
newTupleExpression = Expression.Condition(Expression.Equal(joins[i], OeConstantToVariableVisitor.NullConstantExpression), nullConstant, newTupleExpression);
}
newJoins[i] = newTupleExpression;
}
}
}
NewExpression newSelectorBody = OeExpressionHelper.CreateTupleExpression(newJoins);
MethodInfo selectMethodInfo = OeMethodInfoHelper.GetSelectMethodInfo(parameter.Type, newSelectorBody.Type);
LambdaExpression newSelector = Expression.Lambda(newSelectorBody, parameter);
//Quirk EF Core 2.1.1 bug Take/Skip must be last in expression tree
var skipTakeExpressions = new List <MethodCallExpression>();
while (source is MethodCallExpression callExpression && (callExpression.Method.Name == nameof(Enumerable.Skip) || callExpression.Method.Name == nameof(Enumerable.Take)))
{
skipTakeExpressions.Add(callExpression);
source = callExpression.Arguments[0];
}
source = Expression.Call(selectMethodInfo, source, newSelector);
for (int i = skipTakeExpressions.Count - 1; i >= 0; i--)
{
MethodInfo skipTakeMethodInfo = skipTakeExpressions[i].Method.GetGenericMethodDefinition().MakeGenericMethod(newSelector.ReturnType);
source = Expression.Call(skipTakeMethodInfo, source, skipTakeExpressions[i].Arguments[1]);
}
return(source);
}
private static OeEntryFactory CreateEntryFactory(OeNavigationSelectItem root, Type clrType, OePropertyAccessor[] skipTokenAccessors)
{
ParameterExpression parameter = Expression.Parameter(typeof(Object));
UnaryExpression typedParameter = Expression.Convert(parameter, clrType);
if (!root.HasNavigationItems())
{
var navigationLinks = new OeEntryFactory[root.NavigationItems.Count];
for (int i = 0; i < root.NavigationItems.Count; i++)
{
OeNavigationSelectItem navigationItem = root.NavigationItems[i];
var nextLinkOptions = new OeEntryFactoryOptions()
{
Accessors = Array.Empty <OePropertyAccessor>(),
EdmNavigationProperty = navigationItem.EdmProperty,
EntitySet = navigationItem.EntitySet,
NavigationSelectItem = navigationItem.NavigationSelectItem,
NextLink = navigationItem.Kind == OeNavigationSelectItemKind.NextLink
};
navigationLinks[i] = new OeEntryFactory(ref nextLinkOptions);
}
var options = new OeEntryFactoryOptions()
{
Accessors = GetAccessors(clrType, root),
EntitySet = root.EntitySet,
NavigationLinks = navigationLinks,
SkipTokenAccessors = skipTokenAccessors
};
root.EntryFactory = new OeEntryFactory(ref options);
}
else
{
List <OeNavigationSelectItem> navigationItems = FlattenNavigationItems(root, true);
IReadOnlyList <MemberExpression> navigationProperties = OeExpressionHelper.GetPropertyExpressions(typedParameter);
int propertyIndex = navigationProperties.Count - 1;
for (int i = navigationItems.Count - 1; i >= 0; i--)
{
OeNavigationSelectItem navigationItem = navigationItems[i];
if (navigationItem.Kind == OeNavigationSelectItemKind.NotSelected)
{
propertyIndex--;
continue;
}
OePropertyAccessor[] accessors = Array.Empty <OePropertyAccessor>();
LambdaExpression? linkAccessor = null;
OeEntryFactory[] nestedNavigationLinks = Array.Empty <OeEntryFactory>();
if (navigationItem.Kind != OeNavigationSelectItemKind.NextLink)
{
accessors = GetAccessors(navigationProperties[propertyIndex].Type, navigationItem);
linkAccessor = Expression.Lambda(navigationProperties[propertyIndex], parameter);
nestedNavigationLinks = GetNestedNavigationLinks(navigationItem);
propertyIndex--;
}
var options = new OeEntryFactoryOptions()
{
Accessors = accessors,
EdmNavigationProperty = navigationItem.Parent == null ? null : navigationItem.EdmProperty,
EntitySet = navigationItem.EntitySet,
LinkAccessor = linkAccessor,
NavigationLinks = nestedNavigationLinks,
NavigationSelectItem = navigationItem.Parent == null ? null : navigationItem.NavigationSelectItem,
NextLink = navigationItem.Kind == OeNavigationSelectItemKind.NextLink,
SkipTokenAccessors = skipTokenAccessors
};
navigationItem.EntryFactory = new OeEntryFactory(ref options);
}
}
return(root.EntryFactory);
}