public virtual IEnumerable <T> GetResultList(Expression expression)
{
var visitor = new QueryTranslationVisitor(new QueryAnalysisContext(entityContext._InternalServices.TypeTranslationUtil)
{
ModifyProjection = true
});
var translationResults = visitor.GetTranslatedResults(expression);
var tableEntityQuery = translationResults.AnalysisContext.RootEntityQuery.TableEntityQuery
.Provider.CreateQuery(translationResults.TranslatedExpression);
if (TypesUtil.IsPrimitiveDataType(typeof(T)))
{
return(tableEntityQuery as IEnumerable <T>);
}
else
{
var tableEntities = new List <object>();
foreach (object o in tableEntityQuery)
{
tableEntities.Add(o);
}
return(MakeResultList(tableEntities, translationResults.AnalysisContext.QueryableType.NonPrimitiveEnumerableItemType));
}
}
private bool NeedsProjectionModification(Expression currentExpression)
{
//Get the T, when the query returns T or IQueryable<T>
var genericTypeOfResult = typeof(IQueryable).IsAssignableFrom(currentExpression.Type) ?
TypesUtil.GetGenericArgumentForBaseType(currentExpression.Type, typeof(IQueryable <>)) : currentExpression.Type;
//If this is the outermost method, and it is a Non-Primitive Type, we need to modify the Projection
// so that we can add implicit includes (like Inhertiance) and user-requested Includes (Prefetch Paths)
//There are two cases:
// 1) If IQueryable<NonPrimitiveType>, add a Select around translated mce (eg: Where, Select etc)
// 2) If just NonPrimitiveType, add a Select around translatedFirstArg (eg: First, Single etc)
return(AnalysisContext.ModifyProjection && //Don't modify if context.ModifyProjection is false
!(AnalysisContext.QueryableType.NonPrimitiveEnumerableItemType is ProjectedType) && //Don't modify if already modified, that is - context.QueryableType is ProjectedType
!TypesUtil.IsPrimitiveDataType(genericTypeOfResult)); //Don't modify if Primitive Type.
}
//All Entities need to be bound to the context.
public PropertyInfo[] GetPropertiesNeedingContextBinding()
{
if (source == null)
{
return(null);
}
if (source is IEntity)
{
return(source.GetType().GetProperties()
.Where(p => typeof(IEntity).IsAssignableFrom(p.PropertyType) || typeof(IEntityCollection).IsAssignableFrom(p.PropertyType)).ToArray());
}
else
{
return(source.GetType().GetProperties().Where(p => !TypesUtil.IsPrimitiveDataType(p.PropertyType)).ToArray());
}
}
public virtual T GetResult(Expression expression)
{
var visitor = new QueryTranslationVisitor(new QueryAnalysisContext(entityContext._InternalServices.TypeTranslationUtil)
{
ModifyProjection = true
});
var translationResults = visitor.GetTranslatedResults(expression);
var tableEntityQuery = translationResults.AnalysisContext.RootEntityQuery.TableEntityQuery;
var tableEntity = tableEntityQuery.Provider.Execute(translationResults.TranslatedExpression);
if (TypesUtil.IsPrimitiveDataType(typeof(T)))
{
return((T)tableEntity);
}
else
{
return(MakeResult(tableEntity, translationResults.AnalysisContext.QueryableType));
}
}
public ProjectionModification GetModifiedProjection()
{
//There will be no includes or inheritance bindings on primitive types (like int, long, guid etc)
//We can just return the current expression, and QueryableType.
if (TypesUtil.IsPrimitiveDataType(currentExpression.Type))
{
return new ProjectionModification {
ModifiedExpression = currentExpression, QueryableType = queryableType
}
}
;
var parameter = Expression.Parameter(queryableType.NonPrimitiveEnumerableItemType.TranslatedType, "p");
var queryBindings = GetQueryBindings(queryableType.NonPrimitiveEnumerableItemType, parameter);
var includeBindings = GetIncludeBindings(queryBindings);
var requestedBindings = new List <IRequestedBinding>();
queryBindings.ForEach(b => requestedBindings.Add(b));
includeBindings.ForEach(b => requestedBindings.Add(b));
var inheritanceBindings = GetInheritanceBindings(requestedBindings);
var unprojectedBindings = GetUnprojectedBindings(requestedBindings);
var relatedBindings = new List <IRelatedBinding>();
//Add all related bindings to the context.
//We don't need QueryBindings since they are just a wrapped around QueryableTypes
includeBindings.Where(inc => !(inc is UnprojectedIncludeInCollectionBinding)).ToList()
.ForEach(inc => relatedBindings.Add(inc));
inheritanceBindings.ForEach(b => relatedBindings.Add(b));
//All set. Create the new Select Expression.
return(CreateMethodCallExpression(parameter, relatedBindings, unprojectedBindings));
}
//Serialization of entities should consider the included fields.
// - If A.B is defined as an include on A at the time of materialization, B should also be serialized
// and re-attached when A is deserialized.
private SerializableObjectGraph CreateObjectGraph(object entity)
{
var sourceType = entity.GetType();
//If this is a collection, create a graph for each item in the collection.
if (TypesUtil.IsNonPrimitiveCollection(sourceType))
{
var list = new List <IObjectGraph>();
foreach (object obj in entity as IEnumerable)
{
list.Add(CreateObjectGraph(obj));
}
return(new SerializableCollection
{
Collection = list,
InstanceType = sourceType
});
}
else
{
var serializableInstance = new SerializableInstance {
Object = entity, InstanceType = entity.GetType()
};
if (entity is IEntity)
{
var materializationIncludes = GetIncludeExpressions((entity as IEntity)._getIntermediateEntity().IncludeDirectives);
foreach (var includeExps in materializationIncludes)
{
AddIncludes(serializableInstance, includeExps.FieldChain, includeExps.IncludesInCollection);
}
}
else
{
if (TypesUtil.IsCompilerGeneratedAnonymousType(sourceType))
{
serializableInstance.Object = null;
serializableInstance.InstanceType = sourceType;
}
var properties = (entity is IEntity) ? sourceType.GetProperties()
.Where(p => typeof(IEntity).IsAssignableFrom(p.PropertyType) ||
typeof(IEntityCollection).IsAssignableFrom(p.PropertyType)).ToArray()
: (TypesUtil.IsPrimitiveDataType(sourceType) || sourceType.IsArray || TypesUtil.IsNonPrimitiveCollection(sourceType)
? new PropertyInfo[] {} : sourceType.GetProperties());
foreach (var prop in properties)
{
var propVal = prop.GetValue(entity, null);
//Primitive types can be stored as is.
if (TypesUtil.IsPrimitiveDataType(prop.PropertyType))
{
serializableInstance.IncludedMembers.Add
(
prop,
new SerializableInstance {
Object = propVal, InstanceType = prop.PropertyType
}
);
continue;
}
//This is a single object (possibly an entity); but not a primitive type or a collection
if (!TypesUtil.IsNonPrimitiveCollection(prop.PropertyType))
{
serializableInstance.IncludedMembers.Add
(
prop,
CreateObjectGraph(propVal)
);
}
//Collection of non-primitive types
else if (TypesUtil.IsNonPrimitiveCollection(prop.PropertyType))
{
var itemsInCollection = new List <IObjectGraph>();
foreach (var item in (propVal as IEnumerable))
{
itemsInCollection.Add(CreateObjectGraph(item));
}
serializableInstance.IncludedMembers.Add
(
prop,
new SerializableCollection
{
Collection = itemsInCollection,
InstanceType = prop.PropertyType
}
);
}
}
}
return(serializableInstance);
}
}
