private object GetProjectionIndex(
HarmonyQueryExpression queryExpression, ProjectionBindingExpression projectionBindingExpression)
{
return(projectionBindingExpression.ProjectionMember != null
? ((ConstantExpression)queryExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember)).Value
: (projectionBindingExpression.Index != null
? (object)projectionBindingExpression.Index
: projectionBindingExpression.IndexMap));
}
private Expression GenerateKey(ProjectionBindingExpression projectionBindingExpression)
=> _queryExpression != null &&
projectionBindingExpression.ProjectionMember != null
? _queryExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember)
: projectionBindingExpression;
public virtual EntityShaperExpression AddNavigationToWeakEntityType(
EntityProjectionExpression entityProjectionExpression,
INavigation navigation,
HarmonyQueryExpression innerQueryExpression,
LambdaExpression outerKeySelector,
LambdaExpression innerKeySelector)
{
// GroupJoin phase
var groupTransparentIdentifierType = TransparentIdentifierFactory.Create(
typeof(DataObjectBase), typeof(IEnumerable <DataObjectBase>));
var outerParameter = Parameter(typeof(DataObjectBase), "outer");
var innerParameter = Parameter(typeof(IEnumerable <DataObjectBase>), "inner");
var outerMemberInfo = groupTransparentIdentifierType.GetTypeInfo().GetDeclaredField("Outer");
var innerMemberInfo = groupTransparentIdentifierType.GetTypeInfo().GetDeclaredField("Inner");
var resultSelector = Lambda(
New(
groupTransparentIdentifierType.GetTypeInfo().DeclaredConstructors.Single(),
new[] { outerParameter, innerParameter }, outerMemberInfo, innerMemberInfo),
outerParameter,
innerParameter);
var groupJoinExpression = Call(
EnumerableMethods.GroupJoin.MakeGenericMethod(
typeof(DataObjectBase), typeof(DataObjectBase), outerKeySelector.ReturnType, groupTransparentIdentifierType),
ServerQueryExpression,
innerQueryExpression.ServerQueryExpression,
outerKeySelector,
innerKeySelector,
resultSelector);
// SelectMany phase
var collectionParameter = Parameter(groupTransparentIdentifierType, "collection");
var collection = MakeMemberAccess(collectionParameter, innerMemberInfo);
outerParameter = Parameter(groupTransparentIdentifierType, "outer");
innerParameter = Parameter(typeof(DataObjectBase), "inner");
var resultValueBufferExpressions = new List <Expression>();
var projectionMapping = new Dictionary <ProjectionMember, Expression>();
var replacingVisitor = new ReplacingExpressionVisitor(
new Dictionary <Expression, Expression>
{
{ CurrentParameter, MakeMemberAccess(outerParameter, outerMemberInfo) },
{ innerQueryExpression.CurrentParameter, innerParameter }
});
var index = 0;
EntityProjectionExpression copyEntityProjectionToOuter(EntityProjectionExpression entityProjection)
{
var readExpressionMap = new Dictionary <IProperty, Expression>();
foreach (var property in GetAllPropertiesInHierarchy(entityProjection.EntityType))
{
var replacedExpression = replacingVisitor.Visit(entityProjection.BindProperty(property));
resultValueBufferExpressions.Add(replacedExpression);
readExpressionMap[property] = CreateReadValueExpression(replacedExpression.Type, index++, property);
}
var newEntityProjection = new EntityProjectionExpression(entityProjection.EntityType, readExpressionMap);
if (ReferenceEquals(entityProjectionExpression, entityProjection))
{
entityProjectionExpression = newEntityProjection;
}
// Also lift nested entity projections
foreach (var navigation in entityProjection.EntityType.GetTypesInHierarchy()
.SelectMany(Microsoft.EntityFrameworkCore.EntityTypeExtensions.GetDeclaredNavigations))
{
var boundEntityShaperExpression = entityProjection.BindNavigation(navigation);
if (boundEntityShaperExpression != null)
{
var innerEntityProjection = (EntityProjectionExpression)boundEntityShaperExpression.ValueBufferExpression;
var newInnerEntityProjection = copyEntityProjectionToOuter(innerEntityProjection);
boundEntityShaperExpression = boundEntityShaperExpression.Update(newInnerEntityProjection);
newEntityProjection.AddNavigationBinding(navigation, boundEntityShaperExpression);
}
}
return(newEntityProjection);
}
foreach (var projection in _projectionMapping)
{
if (projection.Value is EntityProjectionExpression entityProjection)
{
projectionMapping[projection.Key] = copyEntityProjectionToOuter(entityProjection);
}
else
{
var replacedExpression = replacingVisitor.Visit(projection.Value);
resultValueBufferExpressions.Add(replacedExpression);
projectionMapping[projection.Key]
= CreateReadValueExpression(replacedExpression.Type, index++, InferPropertyFromInner(projection.Value));
}
}
_projectionMapping = projectionMapping;
var outerIndex = index;
var nullableReadValueExpressionVisitor = new NullableReadValueExpressionVisitor();
var innerEntityProjection = (EntityProjectionExpression)innerQueryExpression.GetMappedProjection(new ProjectionMember());
var innerReadExpressionMap = new Dictionary <IProperty, Expression>();
foreach (var property in GetAllPropertiesInHierarchy(innerEntityProjection.EntityType))
{
var replacedExpression = replacingVisitor.Visit(innerEntityProjection.BindProperty(property));
replacedExpression = nullableReadValueExpressionVisitor.Visit(replacedExpression);
resultValueBufferExpressions.Add(replacedExpression);
innerReadExpressionMap[property] = CreateReadValueExpression(replacedExpression.Type, index++, property);
}
innerEntityProjection = new EntityProjectionExpression(innerEntityProjection.EntityType, innerReadExpressionMap);
//var collectionSelector = Lambda(
// Call(
// EnumerableMethods.DefaultIfEmptyWithArgument.MakeGenericMethod(typeof(DataObjectBase)),
// collection,
// New(
// _valueBufferConstructor,
// NewArrayInit(
// typeof(object),
// Enumerable.Range(0, index - outerIndex).Select(i => Constant(null))))),
// collectionParameter);
//resultSelector = Lambda(
// New(
// _valueBufferConstructor,
// NewArrayInit(
// typeof(object),
// resultValueBufferExpressions
// .Select(e => e.Type.IsValueType ? Convert(e, typeof(object)) : e)
// .ToArray())),
// outerParameter,
// innerParameter);
//ServerQueryExpression = Call(
// EnumerableMethods.SelectManyWithCollectionSelector.MakeGenericMethod(
// groupTransparentIdentifierType, typeof(DataObjectBase), typeof(DataObjectBase)),
// groupJoinExpression,
// collectionSelector,
// resultSelector);
throw new NotImplementedException();
var entityShaper = new EntityShaperExpression(innerEntityProjection.EntityType, innerEntityProjection, nullable: true);
entityProjectionExpression.AddNavigationBinding(navigation, entityShaper);
return(entityShaper);
}