public virtual Expression Translate(InMemoryQueryExpression queryExpression, Expression expression)
{
_queryExpression = queryExpression;
_clientEval = false;
_projectionMembers.Push(new ProjectionMember());
var result = Visit(expression);
if (result == null)
{
_clientEval = true;
result = Visit(expression);
_projectionMapping.Clear();
}
_queryExpression.ReplaceProjectionMapping(_projectionMapping);
_queryExpression = null;
_projectionMapping.Clear();
_projectionMembers.Clear();
return(result);
}
public virtual Expression Translate(InMemoryQueryExpression queryExpression, Expression expression)
{
_queryExpression = queryExpression;
_clientEval = false;
_projectionMembers.Push(new ProjectionMember());
var expandedExpression = _queryableMethodTranslatingExpressionVisitor.ExpandWeakEntities(_queryExpression, expression);
var result = Visit(expandedExpression);
if (result == null)
{
_clientEval = true;
expandedExpression = _queryableMethodTranslatingExpressionVisitor.ExpandWeakEntities(_queryExpression, expression);
result = Visit(expandedExpression);
_projectionMapping.Clear();
}
_queryExpression.ReplaceProjectionMapping(_projectionMapping);
_queryExpression = null;
_projectionMapping.Clear();
_projectionMembers.Clear();
return(result);
}
public virtual Expression Translate([NotNull] InMemoryQueryExpression queryExpression, [NotNull] Expression expression)
{
_queryExpression = queryExpression;
_clientEval = false;
_projectionMembers.Push(new ProjectionMember());
var expandedExpression = _queryableMethodTranslatingExpressionVisitor.ExpandWeakEntities(_queryExpression, expression);
var result = Visit(expandedExpression);
if (result == QueryCompilationContext.NotTranslatedExpression)
{
_clientEval = true;
expandedExpression = _queryableMethodTranslatingExpressionVisitor.ExpandWeakEntities(_queryExpression, expression);
result = Visit(expandedExpression);
_projectionMapping.Clear();
}
_queryExpression.ReplaceProjectionMapping(_projectionMapping);
_queryExpression = null !;
_projectionMapping.Clear();
_projectionMembers.Clear();
result = MatchTypes(result !, expression.Type);
return(result);
}
public override Expression?Visit(Expression?expression)
{
if (expression is InMemoryQueryExpression inMemoryQueryExpression)
{
var clonedInMemoryQueryExpression = new InMemoryQueryExpression(
inMemoryQueryExpression.ServerQueryExpression, inMemoryQueryExpression._valueBufferParameter)
{
_groupingParameter = inMemoryQueryExpression._groupingParameter,
_singleResultMethodInfo = inMemoryQueryExpression._singleResultMethodInfo,
_scalarServerQuery = inMemoryQueryExpression._scalarServerQuery
};
clonedInMemoryQueryExpression._clientProjections.AddRange(inMemoryQueryExpression._clientProjections.Select(e => Visit(e)));
clonedInMemoryQueryExpression._projectionMappingExpressions.AddRange(inMemoryQueryExpression._projectionMappingExpressions);
foreach (var item in inMemoryQueryExpression._projectionMapping)
{
clonedInMemoryQueryExpression._projectionMapping[item.Key] = Visit(item.Value);
}
return(clonedInMemoryQueryExpression);
}
if (expression is EntityProjectionExpression entityProjectionExpression)
{
return(entityProjectionExpression.Clone());
}
return(base.Visit(expression));
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public ShaperExpressionProcessingExpressionVisitor(
[CanBeNull] InMemoryQueryExpression queryExpression,
[NotNull] ParameterExpression valueBufferParameter)
{
_queryExpression = queryExpression;
_valueBufferParameter = valueBufferParameter;
}
public InMemoryProjectionBindingExpressionVisitor(
[NotNull] InMemoryQueryableMethodTranslatingExpressionVisitor queryableMethodTranslatingExpressionVisitor,
[NotNull] InMemoryExpressionTranslatingExpressionVisitor expressionTranslatingExpressionVisitor)
{
_queryableMethodTranslatingExpressionVisitor = queryableMethodTranslatingExpressionVisitor;
_expressionTranslatingExpressionVisitor = expressionTranslatingExpressionVisitor;
_queryExpression = null !;
}
private object GetProjectionIndex(InMemoryQueryExpression queryExpression, ProjectionBindingExpression projectionBindingExpression)
{
return(projectionBindingExpression.ProjectionMember != null
? ((ConstantExpression)queryExpression.GetMappedProjection(projectionBindingExpression.ProjectionMember)).Value
: (projectionBindingExpression.Index != null
? (object)projectionBindingExpression.Index
: projectionBindingExpression.IndexMap));
}
private static ShapedQueryExpression CreateShapedQueryExpression(IEntityType entityType)
{
var queryExpression = new InMemoryQueryExpression(entityType);
return(new ShapedQueryExpression(
queryExpression,
new EntityShaperExpression(
entityType,
new ProjectionBindingExpression(
queryExpression,
new ProjectionMember(),
typeof(ValueBuffer)),
false)));
}
protected override ShapedQueryExpression CreateShapedQueryExpression(Type elementType)
{
var entityType = _model.FindEntityType(elementType);
var queryExpression = new InMemoryQueryExpression(entityType);
return(new ShapedQueryExpression(
queryExpression,
new EntityShaperExpression(
entityType,
new ProjectionBindingExpression(
queryExpression,
new ProjectionMember(),
typeof(ValueBuffer)),
false)));
}
public InMemoryProjectionBindingRemovingExpressionVisitor(InMemoryQueryExpression queryExpression)
{
_queryExpression = queryExpression;
}
public virtual void AddCrossJoin(InMemoryQueryExpression innerQueryExpression, Type transparentIdentifierType)
{
var outerParameter = Parameter(typeof(ValueBuffer), "outer");
var innerParameter = Parameter(typeof(ValueBuffer), "inner");
var resultValueBufferExpressions = new List <Expression>();
var projectionMapping = new Dictionary <ProjectionMember, Expression>();
var replacingVisitor = new ReplacingExpressionVisitor(
new Dictionary <Expression, Expression>
{
{ ValueBufferParameter, outerParameter },
{ innerQueryExpression.ValueBufferParameter, innerParameter }
});
var index = 0;
var outerMemberInfo = transparentIdentifierType.GetTypeInfo().GetDeclaredField("Outer");
foreach (var projection in _projectionMapping)
{
if (projection.Value is EntityProjectionExpression entityProjection)
{
var readExpressionMap = new Dictionary <IProperty, Expression>();
foreach (var property in GetAllPropertiesInHierarchy(entityProjection.EntityType))
{
resultValueBufferExpressions.Add(replacingVisitor.Visit(entityProjection.BindProperty(property)));
readExpressionMap[property] = CreateReadValueExpression(property.ClrType, index++, property);
}
projectionMapping[projection.Key.Prepend(outerMemberInfo)]
= new EntityProjectionExpression(entityProjection.EntityType, readExpressionMap);
}
else
{
resultValueBufferExpressions.Add(replacingVisitor.Visit(projection.Value));
projectionMapping[projection.Key.Prepend(outerMemberInfo)]
= CreateReadValueExpression(projection.Value.Type, index++, InferPropertyFromInner(projection.Value));
}
}
var innerMemberInfo = transparentIdentifierType.GetTypeInfo().GetDeclaredField("Inner");
foreach (var projection in innerQueryExpression._projectionMapping)
{
if (projection.Value is EntityProjectionExpression entityProjection)
{
var readExpressionMap = new Dictionary <IProperty, Expression>();
foreach (var property in GetAllPropertiesInHierarchy(entityProjection.EntityType))
{
resultValueBufferExpressions.Add(replacingVisitor.Visit(entityProjection.BindProperty(property)));
readExpressionMap[property] = CreateReadValueExpression(property.ClrType, index++, property);
}
projectionMapping[projection.Key.Prepend(innerMemberInfo)]
= new EntityProjectionExpression(entityProjection.EntityType, readExpressionMap);
}
else
{
resultValueBufferExpressions.Add(replacingVisitor.Visit(projection.Value));
projectionMapping[projection.Key.Prepend(innerMemberInfo)]
= CreateReadValueExpression(projection.Value.Type, index++, InferPropertyFromInner(projection.Value));
}
}
var resultSelector = Lambda(
New(
_valueBufferConstructor,
NewArrayInit(
typeof(object),
resultValueBufferExpressions
.Select(e => e.Type.IsValueType ? Convert(e, typeof(object)) : e)
.ToArray())),
outerParameter,
innerParameter);
ServerQueryExpression = Call(
InMemoryLinqOperatorProvider.SelectMany.MakeGenericMethod(
typeof(ValueBuffer), typeof(ValueBuffer), typeof(ValueBuffer)),
ServerQueryExpression,
Lambda(innerQueryExpression.ServerQueryExpression, ValueBufferParameter),
resultSelector);
_projectionMapping = projectionMapping;
}
public virtual void AddLeftJoin(
InMemoryQueryExpression innerQueryExpression,
LambdaExpression outerKeySelector,
LambdaExpression innerKeySelector,
Type transparentIdentifierType)
{
// 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(
InMemoryLinqOperatorProvider.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>
{
{ ValueBufferParameter, MakeMemberAccess(outerParameter, outerMemberInfo) },
{ innerQueryExpression.ValueBufferParameter, innerParameter }
});
var index = 0;
outerMemberInfo = transparentIdentifierType.GetTypeInfo().GetDeclaredField("Outer");
foreach (var projection in _projectionMapping)
{
if (projection.Value is 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);
}
projectionMapping[projection.Key.Prepend(outerMemberInfo)]
= new EntityProjectionExpression(entityProjection.EntityType, readExpressionMap);
}
else
{
var replacedExpression = replacingVisitor.Visit(projection.Value);
resultValueBufferExpressions.Add(replacedExpression);
projectionMapping[projection.Key.Prepend(outerMemberInfo)]
= CreateReadValueExpression(replacedExpression.Type, index++, InferPropertyFromInner(projection.Value));
}
}
var outerIndex = index;
innerMemberInfo = transparentIdentifierType.GetTypeInfo().GetDeclaredField("Inner");
var nullableReadValueExpressionVisitor = new NullableReadValueExpressionVisitor();
foreach (var projection in innerQueryExpression._projectionMapping)
{
if (projection.Value is EntityProjectionExpression entityProjection)
{
var readExpressionMap = new Dictionary <IProperty, Expression>();
foreach (var property in GetAllPropertiesInHierarchy(entityProjection.EntityType))
{
var replacedExpression = replacingVisitor.Visit(entityProjection.BindProperty(property));
replacedExpression = nullableReadValueExpressionVisitor.Visit(replacedExpression);
resultValueBufferExpressions.Add(replacedExpression);
readExpressionMap[property] = CreateReadValueExpression(replacedExpression.Type, index++, property);
}
projectionMapping[projection.Key.Prepend(innerMemberInfo)]
= new EntityProjectionExpression(entityProjection.EntityType, readExpressionMap);
}
else
{
var replacedExpression = replacingVisitor.Visit(projection.Value);
replacedExpression = nullableReadValueExpressionVisitor.Visit(replacedExpression);
resultValueBufferExpressions.Add(replacedExpression);
projectionMapping[projection.Key.Prepend(innerMemberInfo)]
= CreateReadValueExpression(replacedExpression.Type, index++, InferPropertyFromInner(projection.Value));
}
}
var collectionSelector = Lambda(
Call(
InMemoryLinqOperatorProvider.DefaultIfEmptyWithArg.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(
InMemoryLinqOperatorProvider.SelectMany.MakeGenericMethod(
groupTransparentIdentifierType, typeof(ValueBuffer), typeof(ValueBuffer)),
groupJoinExpression,
collectionSelector,
resultSelector);
_projectionMapping = projectionMapping;
}
public ShaperExpressionProcessingExpressionVisitor(
InMemoryQueryExpression queryExpression)
{
_queryExpression = queryExpression;
}
public virtual EntityShaperExpression AddNavigationToWeakEntityType(
EntityProjectionExpression entityProjectionExpression,
INavigation navigation,
InMemoryQueryExpression 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(
InMemoryLinqOperatorProvider.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(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(
InMemoryLinqOperatorProvider.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(
InMemoryLinqOperatorProvider.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);
}
