public static Expression <Func <Tuple, bool> > BuildFilterLambda(int startIndex, IReadOnlyList <Type> keyColumnTypes, Parameter <Tuple> keyParameter)
{
Expression filterExpression = null;
var tupleParameter = Expression.Parameter(WellKnownOrmTypes.Tuple, "tuple");
var valueProperty = WellKnownOrmTypes.ParameterOfTuple
.GetProperty(nameof(Parameter <Tuple> .Value), WellKnownOrmTypes.Tuple);
var keyValue = Expression.Property(Expression.Constant(keyParameter), valueProperty);
for (var i = 0; i < keyColumnTypes.Count; i++)
{
var getValueMethod = WellKnownMembers.Tuple.GenericAccessor.MakeGenericMethod(keyColumnTypes[i]);
var tupleParameterFieldAccess = Expression.Call(
tupleParameter,
getValueMethod,
Expression.Constant(startIndex + i));
var keyParameterFieldAccess = Expression.Call(
keyValue,
getValueMethod,
Expression.Constant(i));
if (filterExpression == null)
{
filterExpression = Expression.Equal(tupleParameterFieldAccess, keyParameterFieldAccess);
}
else
{
filterExpression = Expression.And(filterExpression,
Expression.Equal(tupleParameterFieldAccess, keyParameterFieldAccess));
}
}
return(FastExpression.Lambda <Func <Tuple, bool> >(filterExpression, tupleParameter));
}
private static MethodCallExpression AddProjectionPrefetch(Expression source, LambdaExpression projection)
{
var itemType = QueryHelper.GetSequenceElementType(source.Type);
var projectionType = projection.Body.Type;
var wrapperType = typeof(ProjectionWrapper <,>).MakeGenericType(itemType, projectionType);
var wrapperItemProperty = wrapperType.GetProperty("Item");
var wrapperProjectedProperty = wrapperType.GetProperty("Projected");
var wrapperProjectionParameter = projection.Parameters[0];
var wrapperProjectionLambda = FastExpression.Lambda(
Expression.MemberInit(
Expression.New(wrapperType),
Expression.Bind(wrapperItemProperty, wrapperProjectionParameter),
Expression.Bind(wrapperProjectedProperty, projection.Body)
),
wrapperProjectionParameter);
var wrapperProjection = QueryFactory.Select(source, wrapperProjectionLambda);
var resultProjectionParameter = Expression.Parameter(wrapperType, "wrapper");
var resultProjectionLambda = FastExpression.Lambda(
Expression.MakeMemberAccess(resultProjectionParameter, wrapperItemProperty),
resultProjectionParameter);
var resultProjection = QueryFactory.Select(wrapperProjection, resultProjectionLambda);
return(resultProjection);
}
BuildMaterializer(ProjectionExpression projection, IEnumerable <Parameter <Tuple> > tupleParameters)
{
var tupleReader = Expression.Parameter(typeof(RecordSetReader), "tupleReader");
var session = Expression.Parameter(typeof(Session), "session");
var parameterContext = Expression.Parameter(WellKnownOrmTypes.ParameterContext, "parameterContext");
var itemProjector = projection.ItemProjector;
var materializationInfo = itemProjector.Materialize(context, tupleParameters);
var elementType = itemProjector.Item.Type;
var materializeMethod = MaterializationHelper.MaterializeMethodInfo.MakeGenericMethod(elementType);
var itemMaterializerFactoryMethod =
elementType.IsNullable()
? MaterializationHelper.CreateNullableItemMaterializerMethodInfo.MakeGenericMethod(
elementType.GetGenericArguments()[0])
: MaterializationHelper.CreateItemMaterializerMethodInfo.MakeGenericMethod(elementType);
var itemMaterializer = itemMaterializerFactoryMethod.Invoke(
null, new object[] { materializationInfo.Expression, itemProjector.AggregateType });
Expression <Func <Session, int, MaterializationContext> > materializationContextCtor =
(s, entityCount) => new MaterializationContext(s, entityCount);
var materializationContextExpression = materializationContextCtor
.BindParameters(session, Expression.Constant(materializationInfo.EntitiesInRow));
Expression body = Expression.Call(
materializeMethod,
tupleReader,
materializationContextExpression,
parameterContext,
Expression.Constant(itemMaterializer));
var projectorExpression = FastExpression.Lambda <Func <RecordSetReader, Session, ParameterContext, object> >(
body, tupleReader, session, parameterContext);
return(new Materializer(projectorExpression.CachingCompile()));
}
public override Expression <Func <IEnumerable <Tuple> > > GetEnumerable()
{
var call = Expression.Call(Expression.Constant(enumerableFunc.Target), enumerableFunc.Method);
MethodInfo selectMethod = WellKnownMembers.Enumerable.Select.MakeGenericMethod(typeof(TItem), typeof(Tuple));
var select = Expression.Call(selectMethod, call, Expression.Constant(converter));
return(FastExpression.Lambda <Func <IEnumerable <Tuple> > >(select));
}
public static LambdaExpression MakeLambda(Expression expression, TranslatorContext context)
{
var tupleParameter = Expression.Parameter(typeof(Tuple), "tuple");
var visitor = new ExpressionMaterializer(tupleParameter, context, null, EnumerableUtils <Parameter <Tuple> > .Empty);
var processedExpression = OwnerRemover.RemoveOwner(expression);
return(FastExpression.Lambda(visitor.Visit(processedExpression), tupleParameter));
}
private static T Evaluate <T>(Expression expression)
{
if (expression.NodeType == ExpressionType.Constant)
{
return((T)((ConstantExpression)expression).Value);
}
return(FastExpression.Lambda <Func <T> >(expression).CachingCompile().Invoke());
}
public override Expression <Func <ParameterContext, IEnumerable <Tuple> > > GetEnumerable()
{
var paramContext = Expression.Parameter(WellKnownOrmTypes.ParameterContext, "context");
var call = Expression.Call(Expression.Constant(enumerableFunc.Target), enumerableFunc.Method, paramContext);
var selectMethod = WellKnownMembers.Enumerable.Select.MakeGenericMethod(typeof(TItem), WellKnownOrmTypes.Tuple);
var select = Expression.Call(selectMethod, call, Expression.Constant(converter));
return(FastExpression.Lambda <Func <ParameterContext, IEnumerable <Tuple> > >(select, paramContext));
}
public Expression <Func <Tuple, Tuple, bool> > Rewrite(Expression <Func <Tuple, bool> > predicate,
ColumnCollection predicateColumns, ColumnCollection currentColumns)
{
Initialize(predicate, predicateColumns, currentColumns);
leftTupleParameter = Expression.Parameter(typeof(Tuple), "leftTuple");
var visited = Visit(predicate.Body);
return((Expression <Func <Tuple, Tuple, bool> >)FastExpression
.Lambda(visited, leftTupleParameter, predicate.Parameters[0]));
}
private MappingEntry CreateMappingEntry(Expression expression)
{
var tupleAccess = expression.StripCasts().AsTupleAccess();
if (tupleAccess != null)
{
return(new MappingEntry(tupleAccess.GetTupleAccessArgument()));
}
return(new MappingEntry(FastExpression.Lambda(expression, calculatedColumnParameter)));
}
public Expression <Func <Tuple, bool> > CreatePredicatesConjunction(
Expression <Func <Tuple, bool> > newPredicate, Expression <Func <Tuple, bool> > oldPredicate)
{
var oldParameter = oldPredicate.Parameters[0];
var newParameter = newPredicate.Parameters[0];
var result = (Expression <Func <Tuple, bool> >)parameterRewriter
.Replace(oldPredicate, oldParameter, newParameter);
return((Expression <Func <Tuple, bool> >)FastExpression.Lambda(Expression
.AndAlso(result.Body, newPredicate.Body), newParameter));
}
public Expression <Func <ParameterContext, T> > BindToParameterContext(Expression parameterExpression)
{
var body = Visit(parameterExpression);
var resultType = typeof(T);
if (resultType != body.Type)
{
body = Expression.Convert(body, resultType);
}
return(FastExpression.Lambda <Func <ParameterContext, T> >(body, parameterContextArgument));
}
public static MaterializationInfo MakeMaterialization(ItemProjectorExpression projector, TranslatorContext context,
IEnumerable <Parameter <Tuple> > tupleParameters)
{
var tupleParameter = Expression.Parameter(typeof(Tuple), "tuple");
var materializationContextParameter = Expression.Parameter(typeof(ItemMaterializationContext), "mc");
var visitor = new ExpressionMaterializer(tupleParameter, context, materializationContextParameter, tupleParameters);
var lambda = FastExpression.Lambda(visitor.Visit(projector.Item), tupleParameter, materializationContextParameter);
var count = visitor.entityRegistry.Count;
return(new MaterializationInfo(count, lambda));
}
private static Expression <Func <IEnumerable <Tuple> > > RemapRawProviderSource(Expression <Func <IEnumerable <Tuple> > > source, MapTransform mappingTransform)
{
var selectMethodInfo = typeof(Enumerable)
.GetMethods()
.Single(methodInfo => methodInfo.Name == "Select" &&
methodInfo.GetParameters()[1].ParameterType.GetGenericTypeDefinition() == typeof(Func <,>))
.MakeGenericMethod(typeof(Tuple), typeof(Tuple));
Func <Tuple, Tuple> selector = tuple => mappingTransform.Apply(TupleTransformType.Auto, tuple);
var newExpression = Expression.Call(selectMethodInfo, source.Body, Expression.Constant(selector));
return((Expression <Func <IEnumerable <Tuple> > >)FastExpression.Lambda(newExpression));
}
public static void BuildFilter(IndexInfo index)
{
ArgumentValidator.EnsureArgumentNotNull(index, "index");
var parameter = Expression.Parameter(WellKnownOrmTypes.Tuple, "tuple");
var builder = new PartialIndexFilterBuilder(index, parameter);
var body = builder.Visit(index.FilterExpression.Body);
var filter = new PartialIndexFilterInfo {
Expression = FastExpression.Lambda(body, parameter),
Fields = builder.usedFields,
};
index.Filter = filter;
}
private Expression VisitQuerySingle(MethodCallExpression mc)
{
var returnType = mc.Method.ReturnType;
var argument = mc.Arguments[0];
var queryAll = Expression.Call(null, WellKnownMembers.Query.All.MakeGenericMethod(returnType));
var source = ConstructQueryable(queryAll);
var parameter = Expression.Parameter(returnType, "entity");
var keyAccessor = Expression.MakeMemberAccess(parameter, WellKnownMembers.IEntityKey);
var equility = Expression.Equal(keyAccessor, argument);
var lambda = FastExpression.Lambda(equility, parameter);
return(VisitFirstSingle(source, lambda, mc.Method, false));
}
public IQueryable SelectPropertySwitchingToGeneric(IQueryable queryable, string propertyName)
{
Type entityType = queryable.ElementType;
var propertyInfo = entityType.GetProperty(propertyName);
var parameter = Expression.Parameter(entityType, "paramName");
var body = Expression.MakeMemberAccess(parameter, propertyInfo);
var lambda = FastExpression.Lambda(body, parameter); // paramName=>paramName.Name
var getPropertyValuesMethodInfo = typeof(MiscTest).GetMethod("SelectPropertyGeneric");
var genericMethod = getPropertyValuesMethodInfo.MakeGenericMethod(entityType, propertyInfo.PropertyType);
return((IQueryable)genericMethod.Invoke(null, new object[] { queryable, lambda }));
}
private Func <IEnumerable <Tuple>, Session, Dictionary <Parameter <Tuple>, Tuple>, ParameterContext, TResult> BuildMaterializer <TResult>(
ProjectionExpression projection, IEnumerable <Parameter <Tuple> > tupleParameters)
{
var rs = Expression.Parameter(typeof(IEnumerable <Tuple>), "rs");
var session = Expression.Parameter(typeof(Session), "session");
var tupleParameterBindings = Expression.Parameter(typeof(Dictionary <Parameter <Tuple>, Tuple>), "tupleParameterBindings");
var parameterContext = Expression.Parameter(typeof(ParameterContext), "parameterContext");
var itemProjector = projection.ItemProjector;
var materializationInfo = itemProjector.Materialize(context, tupleParameters);
var elementType = itemProjector.Item.Type;
var materializeMethod = MaterializationHelper.MaterializeMethodInfo
.MakeGenericMethod(elementType);
var compileMaterializerMethod = MaterializationHelper.CompileItemMaterializerMethodInfo
.MakeGenericMethod(elementType);
var itemMaterializer = compileMaterializerMethod.Invoke(null, new[] { materializationInfo.Expression });
Expression <Func <Session, int, MaterializationContext> > materializationContextCtor = (s, n) => new MaterializationContext(s, n);
var materializationContextExpression = materializationContextCtor
.BindParameters(
session,
Expression.Constant(materializationInfo.EntitiesInRow));
Expression body = Expression.Call(
materializeMethod,
rs,
materializationContextExpression,
parameterContext,
Expression.Constant(itemMaterializer),
tupleParameterBindings);
if (projection.IsScalar)
{
var scalarMethodName = projection.ResultType.ToString();
var enumerableMethod = typeof(Enumerable)
.GetMethods(BindingFlags.Static | BindingFlags.Public)
.First(m => m.Name == scalarMethodName && m.GetParameters().Length == 1)
.MakeGenericMethod(elementType);
body = Expression.Call(enumerableMethod, body);
}
body = body.Type == typeof(TResult)
? body
: Expression.Convert(body, typeof(TResult));
var projectorExpression = FastExpression.Lambda <Func <IEnumerable <Tuple>, Session, Dictionary <Parameter <Tuple>, Tuple>, ParameterContext, TResult> >(body, rs, session, tupleParameterBindings, parameterContext);
return(projectorExpression.CachingCompile());
}
public void AddValues()
{
foreach (SetDescriptor descriptor in Descriptors)
{
var addContext = new AddValueContext {
Descriptor = descriptor,
Lambda =
FastExpression.Lambda(
WellKnownMembers.FuncOfTArgTResultType.MakeGenericType(typeof(T), descriptor.Expression.Type),
descriptor.Expression,
descriptor.Parameter),
Statement = Statement
};
descriptor.Expression.Visit(
delegate(ParameterExpression p) {
// ReSharper disable AccessToModifiedClosure
if (p == descriptor.Parameter)
{
// ReSharper restore AccessToModifiedClosure
addContext.EntityParamExists = true;
}
return(p);
});
addContext.SubqueryExists = descriptor.Expression.IsContainsQuery();
addContext.Field = descriptor.Field;
if (addContext.Field.IsEntitySet)
{
throw new NotSupportedException("EntitySets are not supported");
}
if (addContext.Field.IsEntity)
{
AddEntityValue(addContext);
continue;
}
if (!addContext.EntityParamExists && addContext.SubqueryExists)
{
AddComputedStaticExpression(addContext);
}
else if (addContext.EntityParamExists || addContext.SubqueryExists)
{
AddComputedExpression(addContext);
}
else
{
AddConstantValue(addContext);
}
}
}
/// <summary>
/// Extracts the parameter.
/// </summary>
/// <param name="expression">The expression.</param>
public Expression <Func <T> > ExtractParameter <T>(Expression expression)
{
if (expression.NodeType == ExpressionType.Lambda)
{
return((Expression <Func <T> >)expression);
}
Type type = expression.Type;
if (type.IsValueType)
{
expression = Expression.Convert(expression, typeof(T));
}
var lambda = FastExpression.Lambda <Func <T> >(expression);
return(lambda);
}
public static bool TryRewrite(LambdaExpression resultSelector,
ParameterExpression sourceParameter, ParameterExpression targetParameter, out LambdaExpression result)
{
var parameters = resultSelector.Parameters
.Select(p => p == sourceParameter ? targetParameter : p)
.ToArray();
var rewriter = new SelectManySelectorRewriter(sourceParameter, targetParameter);
var body = rewriter.Visit(resultSelector.Body);
if (rewriter.processingFailed)
{
result = null;
return(false);
}
result = FastExpression.Lambda(body, parameters);
return(true);
}
private void AddConstantValue(AddValueContext addContext)
{
SqlTableColumn column = SqlDml.TableColumn(addContext.Statement.Table, addContext.Field.Column.Name);
SqlExpression value;
object constant = FastExpression.Lambda(addContext.Lambda.Body).Compile().DynamicInvoke();
if (constant == null)
{
value = SqlDml.Null;
}
else
{
QueryParameterBinding binding = parent.QueryBuilder.CreateParameterBinding(constant.GetType(), context => constant);
parent.Bindings.Add(binding);
value = binding.ParameterReference;
}
addContext.Statement.AddValue(column, value);
}
/// <summary>
/// Strips <see cref="Expression.Quote"/> expressions.
/// </summary>
/// <param name="expression">The expression.</param>
public static LambdaExpression StripQuotes(this Expression expression)
{
while (expression.NodeType == ExpressionType.Quote)
{
expression = ((UnaryExpression)expression).Operand;
}
var lambda = expression as LambdaExpression;
if (lambda == null)
{
if (!typeof(LambdaExpression).IsAssignableFrom(expression.Type))
{
throw new InvalidOperationException(string.Format("Unable to process expression '{0}'", expression));
}
var typeAs = Expression.TypeAs(expression, typeof(LambdaExpression));
return(FastExpression.Lambda <Func <LambdaExpression> >(typeAs).CachingCompile()());
}
return(lambda);
}
public static LambdaExpression Execute(LambdaExpression expression)
{
// Transform lamba expression as follows:
// if original lambda contains sequence of reference field traversals,
// extract this traversal sequence and create lambda with it as body, otherwise return null.
// Longest possible expression is returned.
// Example 1: e => e.Ref.Value > 0 transforms into e => e.Foo
// Example 2: e => e.Value transforms into null
// Example 3: e => e.Ref1.Ref2!=null transforms into e => e.Ref1.Ref
var extractor = new ReferenceFieldAccessExtractor();
extractor.parameter = expression.Parameters[0];
extractor.Visit(expression);
return(extractor.result == null
? null
: FastExpression.Lambda(extractor.result, extractor.parameter));
}
/// <summary>
/// Evaluates the specified <paramref name="e"/> into <see cref="ConstantExpression"/>.
/// </summary>
/// <param name="e">The expression.</param>
public static ConstantExpression Evaluate(Expression e)
{
if (e == null)
{
return(null);
}
if (e.NodeType == ExpressionType.Constant)
{
return((ConstantExpression)e);
}
Type type = e.Type;
if (type.IsValueType)
{
e = Expression.Convert(e, typeof(object));
}
var lambda = FastExpression.Lambda <Func <object> >(e);
var func = lambda.CachingCompile();
return(Expression.Constant(func(), type));
}
public IQueryable SelectPropertyBuildingExpression(IQueryable queryable, string propertyName)
{
Type entityType = queryable.ElementType;
var propertyInfo = entityType.GetProperty(propertyName);
var queryAllExpression = Expression.Constant(queryable);
var selectMethodInfo = typeof(System.Linq.Queryable).GetMethods()
.Single(methodInfo => methodInfo.Name == Xtensive.Reflection.WellKnown.Queryable.Select &&
methodInfo.GetParameters()[1].ParameterType.GetGenericArguments()[0].GetGenericArguments().Length == 2);
var parameter = Expression.Parameter(entityType, "paramName");
var body = Expression.MakeMemberAccess(parameter, propertyInfo);
var lambda = FastExpression.Lambda(body, parameter); // paramName=>paramName.Name
var genericSelectMethodInfo = selectMethodInfo.MakeGenericMethod(entityType, propertyInfo.PropertyType);
var selectExpression = Expression.Call(genericSelectMethodInfo, queryAllExpression, lambda);
return((IQueryable)FastExpression
.Lambda(selectExpression, EnumerableUtils <ParameterExpression> .Empty)
.Compile()
.DynamicInvoke());
}
private static void AddGroupByItemWrapper(GroupByQuery groupBy, List <LambdaExpression> elementProjections)
{
var keySelector = groupBy.KeySelector;
var elementSelector = groupBy.ElementSelector;
var keyType = keySelector.Body.Type;
var elementType = elementSelector.Body.Type;
var wrapperType = typeof(GroupByItemWrapper <,>).MakeGenericType(keyType, elementType);
var wrapperKeyProperty = wrapperType.GetProperty("Key");
var wrapperElementProperty = wrapperType.GetProperty("Element");
var projectionParameter = keySelector.Parameters[0];
var projectionLambda = FastExpression.Lambda(
Expression.MemberInit(
Expression.New(wrapperType),
Expression.Bind(wrapperKeyProperty, keySelector.Body),
Expression.Bind(wrapperElementProperty,
elementSelector.BindParameters(projectionParameter))),
projectionParameter);
groupBy.Source = QueryFactory.Select(groupBy.Source, projectionLambda);
var wrapperParameter = Expression.Parameter(wrapperType, "wrapper");
var wrapperKeyAccess = Expression.MakeMemberAccess(wrapperParameter, wrapperKeyProperty);
var wrapperElementAccess = Expression.MakeMemberAccess(wrapperParameter, wrapperElementProperty);
groupBy.KeySelector = FastExpression.Lambda(wrapperKeyAccess, wrapperParameter);
groupBy.ElementSelector = FastExpression.Lambda(wrapperElementAccess, wrapperParameter);
for (int i = 0; i < elementProjections.Count; i++)
{
elementProjections[i] = FastExpression.Lambda(
elementProjections[i].BindParameters(wrapperElementAccess),
wrapperParameter);
}
}
internal static object Invoke(this Expression expression)
{
return(FastExpression.Lambda(typeof(Func <>).MakeGenericType(expression.Type), expression).Compile().DynamicInvoke());
}
private void AddEntityValue(AddValueContext addContext)
{
if (addContext.EntityParamExists)
{
throw new NotSupportedException("Expressions with reference to updating entity are not supported");
}
var methodCall = addContext.Descriptor.Expression as MethodCallExpression;
int i;
if (methodCall != null)
{
if (methodCall.Method.DeclaringType == typeof(QueryEndpoint) &&
methodCall.Method.Name.In("Single", "SingleOrDefault"))
{
object[] keys;
if (methodCall.Arguments[0].Type == typeof(Key) || methodCall.Arguments[0].Type.IsSubclassOf(typeof(Key)))
{
var key = (Key)methodCall.Arguments[0].Invoke();
keys = new object[key.Value.Count];
for (i = 0; i < keys.Length; i++)
{
keys[i] = key.Value.GetValue(i);
}
}
else
{
keys = (object[])methodCall.Arguments[0].Invoke();
}
i = -1;
foreach (ColumnInfo column in addContext.Field.Columns)
{
i++;
SqlExpression value;
if (keys[i] == null)
{
value = SqlDml.Null;
}
else
{
object v = keys[i];
QueryParameterBinding binding = parent.QueryBuilder.CreateParameterBinding(v.GetType(), context => v);
parent.Bindings.Add(binding);
value = binding.ParameterReference;
}
SqlTableColumn c = SqlDml.TableColumn(addContext.Statement.Table, column.Name);
addContext.Statement.AddValue(c, value);
}
return;
}
if (methodCall.Method.DeclaringType == typeof(Queryable) &&
methodCall.Method.Name.In("Single", "SingleOrDefault", "First", "FirstOrDefault"))
{
Expression exp = methodCall.Arguments[0];
TypeInfo info = parent.GetTypeInfo(addContext.Field.ValueType);
if (methodCall.Arguments.Count == 2)
{
exp = Expression.Call(
typeof(Queryable), "Where", new[] { info.UnderlyingType }, exp, methodCall.Arguments[1]);
}
exp = Expression.Call(typeof(Queryable), "Take", new[] { info.UnderlyingType }, exp, Expression.Constant(1));
i = -1;
foreach (FieldInfo field in
info.Key.Fields)
{
i++;
ParameterExpression p = Expression.Parameter(info.UnderlyingType);
LambdaExpression lambda =
FastExpression.Lambda(
WellKnownMembers.FuncOfTArgTResultType.MakeGenericType(info.UnderlyingType, field.ValueType),
Expression.MakeMemberAccess(p, field.UnderlyingProperty),
p);
IQueryable q =
((IQueryProvider)parent.QueryProvider).CreateQuery(
Expression.Call(typeof(Queryable), "Select", new[] { info.UnderlyingType, field.ValueType }, exp, lambda));
QueryTranslationResult request = parent.GetRequest(field.ValueType, q);
parent.Bindings.AddRange(request.ParameterBindings);
SqlTableColumn c = SqlDml.TableColumn(addContext.Statement.Table, addContext.Field.Columns[i].Name);
addContext.Statement.AddValue(c, SqlDml.SubQuery((ISqlQueryExpression)request.Query));
}
return;
}
}
i = -1;
var entity = (IEntity)FastExpression.Lambda(addContext.Lambda.Body).Compile().DynamicInvoke();
foreach (ColumnInfo column in addContext.Field.Columns)
{
i++;
SqlExpression value;
if (entity == null)
{
value = SqlDml.Null;
}
else
{
object v = entity.Key.Value.GetValue(i);
QueryParameterBinding binding = parent.QueryBuilder.CreateParameterBinding(v.GetType(), context => v);
parent.Bindings.Add(binding);
value = binding.ParameterReference;
}
SqlTableColumn c = SqlDml.TableColumn(addContext.Statement.Table, column.Name);
addContext.Statement.AddValue(c, value);
}
}
internal static object Invoke(this Expression expression)
{
return(FastExpression.Lambda(
WellKnownMembers.FuncOfTResultType.MakeGenericType(expression.Type), expression).Compile().DynamicInvoke());
}
public static Expression CreateEntitySetQuery(Expression ownerEntity, FieldInfo field)
{
if (!field.IsDynamicallyDefined && !field.UnderlyingProperty.PropertyType.IsOfGenericType(WellKnownOrmTypes.EntitySetOfT))
{
throw Exceptions.InternalError(Strings.ExFieldMustBeOfEntitySetType, OrmLog.Instance);
}
if (field.IsDynamicallyDefined && !field.ValueType.IsOfGenericType(WellKnownOrmTypes.EntitySetOfT))
{
throw Exceptions.InternalError(Strings.ExFieldMustBeOfEntitySetType, OrmLog.Instance);
}
var elementType = field.ItemType;
var association = field.Associations.Last();
if (association.Multiplicity == Multiplicity.OneToMany)
{
var targetField = association.TargetType.Fields[association.Reversed.OwnerField.Name];
var whereParameter = Expression.Parameter(elementType, "p");
var expression = BuildExpressionForFieldRecursivly(targetField, whereParameter);
var whereExpression = Expression.Equal(
Expression.Property(
expression,
WellKnownMembers.IEntityKey),
Expression.Property(
ownerEntity,
WellKnownMembers.IEntityKey)
);
return(Expression.Call(
WellKnownMembers.Queryable.Where.MakeGenericMethod(elementType),
CreateEntityQuery(elementType),
FastExpression.Lambda(whereExpression, whereParameter)
));
}
var connectorType = association.AuxiliaryType.UnderlyingType;
var referencingField = association.IsMaster
? association.AuxiliaryType.Fields[WellKnown.SlaveFieldName]
: association.AuxiliaryType.Fields[WellKnown.MasterFieldName];
var referencedField = association.IsMaster
? association.AuxiliaryType.Fields[WellKnown.MasterFieldName]
: association.AuxiliaryType.Fields[WellKnown.SlaveFieldName];
var filterParameter = Expression.Parameter(connectorType, "t");
var filterExpression = Expression.Equal(
Expression.MakeMemberAccess(
Expression.MakeMemberAccess(filterParameter, referencedField.UnderlyingProperty),
WellKnownMembers.IEntityKey),
Expression.MakeMemberAccess(
ownerEntity,
WellKnownMembers.IEntityKey)
);
var outerQuery = Expression.Call(
WellKnownMembers.Queryable.Where.MakeGenericMethod(connectorType),
CreateEntityQuery(connectorType),
FastExpression.Lambda(filterExpression, filterParameter)
);
var outerSelectorParameter = Expression.Parameter(connectorType, "o");
var outerSelector = FastExpression.Lambda(
Expression.MakeMemberAccess(outerSelectorParameter, referencingField.UnderlyingProperty),
outerSelectorParameter);
var innerSelectorParameter = Expression.Parameter(elementType, "i");
var innerSelector = FastExpression.Lambda(innerSelectorParameter, innerSelectorParameter);
var resultSelector = FastExpression.Lambda(innerSelectorParameter, outerSelectorParameter, innerSelectorParameter);
var innerQuery = CreateEntityQuery(elementType);
var joinMethodInfo = WellKnownTypes.Queryable.GetMethods()
.Single(mi => mi.Name == Xtensive.Reflection.WellKnown.Queryable.Join && mi.IsGenericMethod && mi.GetParameters().Length == 5)
.MakeGenericMethod(new[] {
connectorType,
elementType,
outerSelector.Body.Type,
resultSelector.Body.Type
});
return(Expression.Call(joinMethodInfo,
outerQuery,
innerQuery,
outerSelector,
innerSelector,
resultSelector));
}