public FileContextQueryExpression(IEntityType entityType)
{
_valueBufferParameter = Parameter(typeof(ValueBuffer), "valueBuffer");
ServerQueryExpression = new FileContextTableExpression(entityType);
var readExpressionMap = new Dictionary <IProperty, Expression>();
foreach (var property in entityType.GetAllBaseTypesInclusive().SelectMany(et => et.GetDeclaredProperties()))
{
readExpressionMap[property] = CreateReadValueExpression(property.ClrType, property.GetIndex(), property);
}
foreach (var property in entityType.GetDerivedTypes().SelectMany(et => et.GetDeclaredProperties()))
{
readExpressionMap[property] = Condition(
LessThan(
Constant(property.GetIndex()),
MakeMemberAccess(_valueBufferParameter,
_valueBufferCountMemberInfo)),
CreateReadValueExpression(property.ClrType, property.GetIndex(), property),
Default(property.ClrType));
}
var entityProjection = new EntityProjectionExpression(entityType, readExpressionMap);
_projectionMapping[new ProjectionMember()] = entityProjection;
}
public virtual IDictionary <IProperty, int> AddToProjection(EntityProjectionExpression entityProjectionExpression)
{
if (!_entityProjectionCache.TryGetValue(entityProjectionExpression, out var indexMap))
{
indexMap = new Dictionary <IProperty, int>();
foreach (var property in GetAllPropertiesInHierarchy(entityProjectionExpression.EntityType))
{
indexMap[property] = AddToProjection(entityProjectionExpression.BindProperty(property));
}
_entityProjectionCache[entityProjectionExpression] = indexMap;
}
return(indexMap);
}
public virtual EntityShaperExpression AddNavigationToWeakEntityType(
EntityProjectionExpression entityProjectionExpression,
INavigation navigation,
FileContextQueryExpression innerQueryExpression,
LambdaExpression outerKeySelector,
LambdaExpression innerKeySelector)
{
// GroupJoin phase
var groupTransparentIdentifierType = TransparentIdentifierFactory.Create(
typeof(ValueBuffer), typeof(IEnumerable <ValueBuffer>));
var outerParameter = Parameter(typeof(ValueBuffer), "outer");
var innerParameter = Parameter(typeof(IEnumerable <ValueBuffer>), "inner");
var outerMemberInfo = groupTransparentIdentifierType.GetTypeInfo().GetDeclaredField("Outer");
var innerMemberInfo = groupTransparentIdentifierType.GetTypeInfo().GetDeclaredField("Inner");
var resultSelector = Lambda(
New(
groupTransparentIdentifierType.GetTypeInfo().DeclaredConstructors.Single(),
new[] { outerParameter, innerParameter },
new[] { outerMemberInfo, innerMemberInfo }),
outerParameter,
innerParameter);
var groupJoinExpression = Call(
FileContextLinqOperatorProvider.GroupJoin.MakeGenericMethod(
typeof(ValueBuffer), typeof(ValueBuffer), 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(ValueBuffer), "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(
FileContextLinqOperatorProvider.DefaultIfEmptyWithArgument.MakeGenericMethod(typeof(ValueBuffer)),
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(
FileContextLinqOperatorProvider.SelectManyWithCollectionSelector.MakeGenericMethod(
groupTransparentIdentifierType, typeof(ValueBuffer), typeof(ValueBuffer)),
groupJoinExpression,
collectionSelector,
resultSelector);
var entityShaper = new EntityShaperExpression(innerEntityProjection.EntityType, innerEntityProjection, nullable: true);
entityProjectionExpression.AddNavigationBinding(navigation, entityShaper);
return(entityShaper);
}