private static Expression HandleTake(
EntityQueryModelVisitor entityQueryModelVisitor, TakeResultOperator takeResultOperator)
{
return(Expression.Call(
_take.MakeGenericMethod(entityQueryModelVisitor.StreamedSequenceInfo.ResultItemType),
entityQueryModelVisitor.Expression, takeResultOperator.Count));
}
private static bool ProcessTake(
SelectExpression selectExpression, TakeResultOperator takeResultOperator)
{
selectExpression.AddLimit(takeResultOperator.GetConstantCount());
return(false);
}
private static Expression HandleTake(
EntityQueryModelVisitor entityQueryModelVisitor, TakeResultOperator takeResultOperator)
{
var countExpression
= new DefaultQueryExpressionVisitor(entityQueryModelVisitor)
.Visit(takeResultOperator.Count);
if (entityQueryModelVisitor.Expression is MethodCallExpression methodCallExpression &&
(methodCallExpression.Method
.MethodIsClosedFormOf(entityQueryModelVisitor.LinqOperatorProvider.Select) ||
methodCallExpression.Method
.MethodIsClosedFormOf(AsyncLinqOperatorProvider.SelectAsyncMethod)))
{
// Push Take down below Select
return
(methodCallExpression.Update(
methodCallExpression.Object,
new[]
{
Expression.Call(
entityQueryModelVisitor.LinqOperatorProvider.Take
.MakeGenericMethod(methodCallExpression.Arguments[0].Type.GetSequenceType()),
methodCallExpression.Arguments[0],
countExpression),
methodCallExpression.Arguments[1]
}));
}
return(Expression.Call(
entityQueryModelVisitor.LinqOperatorProvider.Take
.MakeGenericMethod(entityQueryModelVisitor.Expression.Type.GetSequenceType()),
entityQueryModelVisitor.Expression,
countExpression));
}
private static bool ProcessTake(
SqlSelect sqlSelect, TakeResultOperator takeResultOperator)
{
sqlSelect.AddLimit(takeResultOperator.GetConstantCount());
return(false);
}
private static Expression HandleTake(
EntityQueryModelVisitor entityQueryModelVisitor, TakeResultOperator takeResultOperator)
=> Expression.Call(
entityQueryModelVisitor.LinqOperatorProvider.Take
.MakeGenericMethod(entityQueryModelVisitor.Expression.Type.GetSequenceType()),
entityQueryModelVisitor.Expression,
new DefaultQueryExpressionVisitor(entityQueryModelVisitor)
.Visit(takeResultOperator.Count));
public override void HandleResultOperator(SingleResultOperator resultOperator, SqlStatementBuilder sqlStatementBuilder, UniqueIdentifierGenerator generator, ISqlPreparationStage stage, ISqlPreparationContext context)
{
var equivalentTakeOperator = new TakeResultOperator(new SqlLiteralExpression(2));
var takeHandler = new TakeResultOperatorHandler();
takeHandler.HandleResultOperator(equivalentTakeOperator, sqlStatementBuilder, generator, stage, context);
UpdateDataInfo(resultOperator, sqlStatementBuilder, sqlStatementBuilder.DataInfo);
}
private void VisitTakeResultOperator(TakeResultOperator takeResultOperation, Remotion.Linq.QueryModel queryModel, int index)
{
if (!(takeResultOperation.Count is System.Linq.Expressions.ConstantExpression))
{
throw new InvalidOperationException("Only constant expressions are supported for the Take operators.");
}
_query.Limit = Convert.ToInt32(((System.Linq.Expressions.ConstantExpression)takeResultOperation.Count).Value);
}
public void HandleResultOperator_TakeAfterSetOperation()
{
_sqlStatementBuilder.SetOperationCombinedStatements.Add(SqlStatementModelObjectMother.CreateSetOperationCombinedStatement());
var takeExpression = Expression.Constant(2);
var resultOperator = new TakeResultOperator(takeExpression);
_handler.HandleResultOperator(resultOperator, _sqlStatementBuilder, UniqueIdentifierGenerator, _stage, _context);
AssertStatementWasMovedToSubStatement(_sqlStatementBuilder);
}
public void HandleResultOperator_NoConstantExpression()
{
var takeExpression = new SqlColumnDefinitionExpression(typeof(int), "c", "ID", true);
var resultOperator = new TakeResultOperator(takeExpression);
_handler.HandleResultOperator(resultOperator, _sqlStatementBuilder, UniqueIdentifierGenerator, _stage, _context);
Assert.That(_sqlStatementBuilder.TopExpression, Is.SameAs(takeExpression));
Assert.That(_sqlStatementBuilder.DataInfo, Is.TypeOf(typeof(StreamedSequenceInfo)));
Assert.That(((StreamedSequenceInfo)_sqlStatementBuilder.DataInfo).DataType, Is.EqualTo(typeof(IQueryable <>).MakeGenericType(typeof(Cook))));
}
public void HandleResultOperator_ConstantExpression()
{
var takeExpression = Expression.Constant(2);
var resultOperator = new TakeResultOperator(takeExpression);
_handler.HandleResultOperator(resultOperator, _sqlStatementBuilder, UniqueIdentifierGenerator, _stage, _context);
Assert.That(((SqlLiteralExpression)_sqlStatementBuilder.TopExpression).Value, Is.EqualTo(2));
Assert.That(_sqlStatementBuilder.DataInfo, Is.TypeOf(typeof(StreamedSequenceInfo)));
Assert.That(((StreamedSequenceInfo)_sqlStatementBuilder.DataInfo).DataType, Is.EqualTo(typeof(IQueryable <>).MakeGenericType(typeof(Cook))));
}
public void HandleResultOperator_TakeAfterGroupExpression()
{
_sqlStatementBuilder.TopExpression = Expression.Constant("group");
var takeExpression = Expression.Constant(2);
var resultOperator = new TakeResultOperator(takeExpression);
_handler.HandleResultOperator(resultOperator, _sqlStatementBuilder, UniqueIdentifierGenerator, _stage, _context);
AssertStatementWasMovedToSubStatement(_sqlStatementBuilder);
}
public void HandleResultOperator_NoConstantExpression ()
{
var takeExpression = new SqlColumnDefinitionExpression (typeof (int), "c", "ID", true);
var resultOperator = new TakeResultOperator (takeExpression);
_handler.HandleResultOperator (resultOperator, _sqlStatementBuilder, _generator, _stage, _context);
Assert.That ( _sqlStatementBuilder.TopExpression, Is.SameAs (takeExpression));
Assert.That (_sqlStatementBuilder.DataInfo, Is.TypeOf (typeof (StreamedSequenceInfo)));
Assert.That (((StreamedSequenceInfo) _sqlStatementBuilder.DataInfo).DataType, Is.EqualTo (typeof (IQueryable<>).MakeGenericType (typeof (Cook))));
}
public void HandleResultOperator_ConstantExpression ()
{
var takeExpression = Expression.Constant (2);
var resultOperator = new TakeResultOperator (takeExpression);
_handler.HandleResultOperator (resultOperator, _sqlStatementBuilder, _generator, _stage, _context);
Assert.That (((SqlLiteralExpression) _sqlStatementBuilder.TopExpression).Value, Is.EqualTo (2));
Assert.That (_sqlStatementBuilder.DataInfo, Is.TypeOf (typeof (StreamedSequenceInfo)));
Assert.That (((StreamedSequenceInfo) _sqlStatementBuilder.DataInfo).DataType, Is.EqualTo (typeof (IQueryable<>).MakeGenericType (typeof (Cook))));
}
public void Visit(TakeResultOperator resultOperator)
{
if (resultOperator.Count.NodeType == ExpressionType.Constant)
{
_queryBuilder.Take = (int)((ConstantExpression)resultOperator.Count).Value;
}
else
{
throw new NotSupportedException("The Take clause only supports constant values. Methods and variables are currently not supported.");
}
}
public void HandleResultOperator_TakeAfterGroupExpression()
{
_sqlStatementBuilder.TopExpression = Expression.Constant("group");
var takeExpression = Expression.Constant(2);
var resultOperator = new TakeResultOperator(takeExpression);
_handler.HandleResultOperator(resultOperator, _sqlStatementBuilder, _generator, _stage, _context);
Assert.That(_sqlStatementBuilder.SqlTables.Count, Is.EqualTo(1));
Assert.That(((SqlTable)_sqlStatementBuilder.SqlTables[0]).TableInfo, Is.TypeOf(typeof(ResolvedSubStatementTableInfo)));
}
public void TransformExpressions()
{
var oldExpression = Expression.Constant(0);
var newExpression = Expression.Constant(1);
var resultOperator = new TakeResultOperator(oldExpression);
resultOperator.TransformExpressions(ex =>
{
Assert.That(ex, Is.SameAs(oldExpression));
return(newExpression);
});
Assert.That(resultOperator.Count, Is.SameAs(newExpression));
}
public void HandleResultOperator_TakeAfterSkipExpression()
{
_sqlStatementBuilder.WhereCondition = null;
_sqlStatementBuilder.RowNumberSelector = Expression.Constant(5);
_sqlStatementBuilder.CurrentRowNumberOffset = Expression.Constant(3);
var takeExpression = Expression.Constant(2);
var resultOperator = new TakeResultOperator(takeExpression);
_handler.HandleResultOperator(resultOperator, _sqlStatementBuilder, UniqueIdentifierGenerator, _stage, _context);
var expectedWhereCondition = Expression.LessThanOrEqual(
_sqlStatementBuilder.RowNumberSelector, Expression.Add(_sqlStatementBuilder.CurrentRowNumberOffset, resultOperator.Count));
Assert.That(_sqlStatementBuilder.SqlTables.Count, Is.EqualTo(1));
SqlExpressionTreeComparer.CheckAreEqualTrees(expectedWhereCondition, _sqlStatementBuilder.WhereCondition);
}
public override void VisitResultOperator(ResultOperatorBase resultOperator, QueryModel queryModel, int index)
{
base.VisitResultOperator(resultOperator, queryModel, index);
if (clause.HasFlag(VisitorClause.SkipTake))
{
if (resultOperator.ToString().Contains("Skip"))
{
SkipResultOperator skip = resultOperator as SkipResultOperator;
builderMongoQuery.AddModifier(Constants.STR_QUERY_MODIFIER_SKIP + skip.Count);
}
else if (resultOperator.ToString().Contains("Take"))
{
TakeResultOperator take = resultOperator as TakeResultOperator;
builderMongoQuery.AddModifier(Constants.STR_QUERY_MODIFIER_LIMIT + take.Count);
}
else
{
throw new KinveyException(EnumErrorCategory.ERROR_GENERAL, EnumErrorCode.ERROR_METHOD_NOT_IMPLEMENTED, "LINQ result operator not supported.");
}
}
}
public override void VisitResultOperator(ResultOperatorBase resultOperator, QueryModel queryModel, int index)
{
resultOptionType = resultOptionType ?? queryModel.SelectClause.Selector.Type;
if (resultOperator is CastResultOperator)
{
CastResultOperator castResultOperator = (CastResultOperator)resultOperator;
Type castType = castResultOperator.CastItemType;
MethodInfo cast = GetMethod("Cast", expression.Type).MakeGenericMethod(castType);
resultOptionType = castType;
expression = Expression.Call(cast, expression);
return;
}
if (resultOperator is AllResultOperator)
{
AllResultOperator allResultOperator = (AllResultOperator)resultOperator;
ParameterExpression parameterExpression = Expression.Parameter(selectorType, "p");
Expression predicateUpdate = UpdateExpressionVisitor.Update(allResultOperator.Predicate, new[] { parameterExpression }, dbContext, queryContext);
Expression allLamda = Expression.Lambda(predicateUpdate, parameterExpression);
MethodInfo all = GetMethod("All", expression.Type, 1).MakeGenericMethod(selectorType);
expression = Expression.Call(all, new[] { expression, allLamda });
return;
}
if (resultOperator is FirstResultOperator)
{
FirstResultOperator firstResultOperator = (FirstResultOperator)resultOperator;
if (firstResultOperator.ReturnDefaultWhenEmpty)
{
MethodInfo firstOrDefault = GetMethod("FirstOrDefault", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(firstOrDefault, new[] { expression });
}
else
{
MethodInfo first = GetMethod("First", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(first, new[] { expression });
}
return;
}
if (resultOperator is SingleResultOperator)
{
SingleResultOperator singleResultOperator = (SingleResultOperator)resultOperator;
if (singleResultOperator.ReturnDefaultWhenEmpty)
{
MethodInfo firstOrDefault = GetMethod("SingleOrDefault", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(firstOrDefault, new[] { expression });
}
else
{
MethodInfo first = GetMethod("Single", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(first, new[] { expression });
}
return;
}
if (resultOperator is AnyResultOperator)
{
MethodInfo any = GetMethod("Any", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(any, new[] { expression });
return;
}
if (resultOperator is TrackingResultOperator)
{
MethodInfo asNoTracking = typeof(EntityFrameworkQueryableExtensions).GetMethod("AsNoTracking").MakeGenericMethod(selectorType);
expression = Expression.Call(asNoTracking, new[] { expression });
return;
}
if (resultOperator is CountResultOperator)
{
MethodInfo count = GetMethod("Count", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(count, new[] { expression });
return;
}
if (resultOperator is AverageResultOperator)
{
MethodInfo average = GetAgregateMethod("Average", expression.Type, selectorType);
expression = Expression.Call(average, new[] { expression });
return;
}
if (resultOperator is ContainsResultOperator)
{
ContainsResultOperator containsResultOperator = (ContainsResultOperator)resultOperator;
Expression valExp;
object value;
ParameterExpression paramExp = containsResultOperator.Item as ParameterExpression;
if (paramExp != null &&
queryContext.ParameterValues.TryGetValue(paramExp.Name, out value))
{
valExp = Expression.Constant(value);
}
else
{
valExp = containsResultOperator.Item;
}
if (containsResultOperator.Item is SubQueryExpression)
{
SubQueryExpression subQueryExpression = (SubQueryExpression)containsResultOperator.Item;
QueryModelVisitor queryModelVisitor = new QueryModelVisitor(dbContext, queryContext);
queryModelVisitor.VisitQueryModel(subQueryExpression.QueryModel);
valExp = queryModelVisitor.expression;
}
MethodInfo contains = GetMethod("Contains", expression.Type, 1).MakeGenericMethod(selectorType);
expression = Expression.Call(contains, new[] { expression, valExp });
return;
}
if (resultOperator is DefaultIfEmptyResultOperator)
{
DefaultIfEmptyResultOperator defaultIfEmptyResultOperator = (DefaultIfEmptyResultOperator)resultOperator;
MethodInfo defaultIfEmpty;
if (defaultIfEmptyResultOperator.OptionalDefaultValue != null)
{
defaultIfEmpty = GetMethod("DefaultIfEmpty", expression.Type, 1).MakeGenericMethod(selectorType);
expression = Expression.Call(defaultIfEmpty, new[] { expression, defaultIfEmptyResultOperator.OptionalDefaultValue });
}
defaultIfEmpty = GetMethod("DefaultIfEmpty", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(defaultIfEmpty, expression);
return;
}
if (resultOperator is DistinctResultOperator)
{
MethodInfo distinct = GetMethod("Distinct", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(distinct, expression);
return;
}
if (resultOperator is GroupResultOperator)
{
GroupResultOperator groupResultOperator = (GroupResultOperator)resultOperator;
Type keySelectorType = GetTypeParameter(groupResultOperator.KeySelector);
ParameterExpression keyExpressionParam = Expression.Parameter(keySelectorType, "p");
Expression keyExpression = UpdateExpressionVisitor.Update(groupResultOperator.KeySelector, new[] { keyExpressionParam }, dbContext, queryContext);
LambdaExpression keyLambdaExpression = Expression.Lambda(keyExpression, keyExpressionParam);
Type elementSelectorType = GetTypeParameter(groupResultOperator.ElementSelector);
ParameterExpression ElementExpressionParam = Expression.Parameter(elementSelectorType, "p");
Expression ElementExpression = UpdateExpressionVisitor.Update(groupResultOperator.ElementSelector, new[] { ElementExpressionParam }, dbContext, queryContext);
LambdaExpression ElementLambdaExpression = Expression.Lambda(ElementExpression, ElementExpressionParam);
Type tSource = queryModel.MainFromClause.ItemType;
Type tKey = keyExpression.Type;
Type tElement = ElementExpression.Type;
Type tResult = queryModel.ResultTypeOverride;
MethodInfo groupBy = GetMethods("GroupBy", expression.Type, 2).Where(p => p.GetParameters()[2].Name == "elementSelector").Single().
MakeGenericMethod(tSource, tKey, tElement);
expression = Expression.Call(groupBy, new[] { expression, keyLambdaExpression, ElementLambdaExpression });
return;
}
if (resultOperator is LastResultOperator)
{
LastResultOperator lastResultOperator = (LastResultOperator)resultOperator;
if (lastResultOperator.ReturnDefaultWhenEmpty)
{
MethodInfo lastOrDefault = GetMethod("LastOrDefault", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(lastOrDefault, new[] { expression });
}
else
{
MethodInfo last = GetMethod("Last", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(last, new[] { expression });
}
return;
}
if (resultOperator is LongCountResultOperator)
{
MethodInfo longCount = GetMethod("LongCount", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(longCount, new[] { expression });
return;
}
if (resultOperator is MaxResultOperator)
{
MethodInfo max = GetMethod("Max", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(max, expression);
return;
}
if (resultOperator is MinResultOperator)
{
MethodInfo min = GetMethod("Min", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(min, expression);
return;
}
if (resultOperator is SumResultOperator)
{
MethodInfo sum = GetAgregateMethod("Sum", expression.Type, selectorType);
expression = Expression.Call(sum, expression);
return;
}
if (resultOperator is SkipResultOperator)
{
SkipResultOperator skipResultOperator = (SkipResultOperator)resultOperator;
Expression expVal;
object value;
ParameterExpression paramExp = skipResultOperator.Count as ParameterExpression;
if (paramExp != null &&
queryContext.ParameterValues.TryGetValue(paramExp.Name, out value))
{
expVal = Expression.Constant(value);
}
else
{
expVal = skipResultOperator.Count;
}
MethodInfo skip = GetMethod("Skip", expression.Type, 1).MakeGenericMethod(selectorType);
expression = Expression.Call(skip, new[] { expression, expVal });
return;
}
if (resultOperator is TakeResultOperator)
{
TakeResultOperator takeResultOperator = (TakeResultOperator)resultOperator;
Expression expVal;
object value;
ParameterExpression paramExp = takeResultOperator.Count as ParameterExpression;
if (paramExp != null &&
queryContext.ParameterValues.TryGetValue(paramExp.Name, out value))
{
expVal = Expression.Constant(value);
}
else
{
expVal = takeResultOperator.Count;
}
MethodInfo take = GetMethod("Take", expression.Type, 1).MakeGenericMethod(selectorType);
expression = Expression.Call(take, new[] { expression, expVal });
return;
}
if (resultOperator is IncludeResultOperator)
{
IncludeResultOperator includeResultOperator = (IncludeResultOperator)resultOperator;
Expression includeExpression = includeResultOperator.NavigationPropertyPath;
Type paramExpressionType = null;
ParameterExpression parameterExpression = null;
if (includeExpression is MemberExpression)
{
MemberExpression memberExpression = (MemberExpression)includeExpression;
paramExpressionType = memberExpression.Expression.Type;
parameterExpression = Expression.Parameter(paramExpressionType, "p");
includeExpression = Expression.Property(parameterExpression, memberExpression.Member.Name);
}
else
{
paramExpressionType = GetTypeParameter(includeExpression);
parameterExpression = Expression.Parameter(paramExpressionType, "p");
}
Expression updateOuterExpression = UpdateExpressionVisitor.Update(includeExpression, new[] { parameterExpression }, dbContext, queryContext);
LambdaExpression lambdaIncludeExpression = Expression.Lambda(updateOuterExpression, parameterExpression);
MethodInfo include = typeof(EntityFrameworkQueryableExtensions).GetMethods().First(m => m.Name == "Include").MakeGenericMethod(selectorType, updateOuterExpression.Type);
expression = Expression.Call(include, new[] { expression, lambdaIncludeExpression });
if (includeResultOperator.ChainedNavigationProperties != null)
{
foreach (PropertyInfo propertyInfo in includeResultOperator.ChainedNavigationProperties)
{
Type propertyType = propertyInfo.PropertyType;
Type argument = expression.Type.GetGenericArguments().Last();
MethodInfo thenInclude;
Type realType;
if (typeof(IEnumerable).IsAssignableFrom(argument))
{
realType = argument.GetGenericArguments().First();
thenInclude = ThenIncludeCollection.MakeGenericMethod(includeResultOperator.QuerySource.ItemType, realType, propertyType);
}
else
{
realType = argument;
thenInclude = ThenIncludeProperty.MakeGenericMethod(includeResultOperator.QuerySource.ItemType, realType, propertyType);
}
ParameterExpression parameterThenIncludeExpression = Expression.Parameter(realType, "p");
MemberExpression property = Expression.Property(parameterThenIncludeExpression, propertyInfo);
LambdaExpression lambdaThenIncludeExpression = Expression.Lambda(property, parameterThenIncludeExpression);
expression = Expression.Call(thenInclude, new[] { expression, lambdaThenIncludeExpression });
}
}
return;
}
if (resultOperator is OfTypeResultOperator)
{
OfTypeResultOperator ofTypeResultOperator = (OfTypeResultOperator)resultOperator;
selectorType = ofTypeResultOperator.SearchedItemType;
var miOfType = GetMethod("OfType", expression.Type).MakeGenericMethod(ofTypeResultOperator.SearchedItemType);
expression = Expression.Call(miOfType, new[] { expression });
return;
}
throw new NotSupportedException();
}
public override void SetObjectOperator(ResultOperatorBase resultOperator)
{
base.SetObjectOperator(resultOperator);
if (ObjectVariable != null)
{
if (resultOperator is AnyResultOperator)
{
// When using x.Any(), we add a LIMIT 1 the query results in the SparqlQueryGenerator.
// When using .Any(x => ..), the variable x is locally scoped and cannot be
// used in outer queries. Therefore do not need to actually select it.
// This avoids issues with Stardog:
// https://community.stardog.com/t/sparql-union-only-working-with-inferencing-enabled/1040/9
}
else if (resultOperator is AverageResultOperator)
{
var aggregate = new AverageAggregate(new VariableTerm(ObjectVariable.Name));
SetObjectVariable(aggregate.AsSparqlVariable(), true);
}
else if (resultOperator is CountResultOperator)
{
var aggregate = new CountDistinctAggregate(new VariableTerm(ObjectVariable.Name));
SetObjectVariable(aggregate.AsSparqlVariable(), true);
}
else if (resultOperator is FirstResultOperator)
{
// "Using LIMIT and OFFSET to select different subsets of the query solutions
// will not be useful unless the order is made predictable by using ORDER BY."
// Source: https://www.w3.org/TR/2013/REC-sparql11-query-20130321/#modOffset
// Therefore, if no ordering exists we add an ordering on the current subject
// to make the query result predictable.
if (!QueryModel.BodyClauses.OfType <OrderByClause>().Any())
{
OrderBy(SubjectVariable);
}
else
{
// In case the order was make explicit, we have to do nothing.
}
Limit(1);
}
else if (resultOperator is LastResultOperator)
{
// "Using LIMIT and OFFSET to select different subsets of the query solutions
// will not be useful unless the order is made predictable by using ORDER BY."
// Source: https://www.w3.org/TR/2013/REC-sparql11-query-20130321/#modOffset
// Therefore, if no ordering exists we add an ordering on the current subject
// to make the query result predictable.
if (!QueryModel.BodyClauses.OfType <OrderByClause>().Any())
{
OrderByDescending(SubjectVariable);
}
else
{
// Inverting the direction of the first ordering is handled in SparqlQueryModelVisitor.VisitOrdering().
// This is because the orderings are not necessarily processed *before* the result operators..
}
Limit(1);
}
else if (resultOperator is MaxResultOperator)
{
var aggregate = new MaxAggregate(new VariableTerm(ObjectVariable.Name));
SetObjectVariable(aggregate.AsSparqlVariable(), true);
}
else if (resultOperator is MinResultOperator)
{
var aggregate = new MinAggregate(new VariableTerm(ObjectVariable.Name));
SetObjectVariable(aggregate.AsSparqlVariable(), true);
}
else if (resultOperator is SumResultOperator)
{
var aggregate = new SumAggregate(new VariableTerm(ObjectVariable.Name));
SetObjectVariable(aggregate.AsSparqlVariable(), true);
}
else if (resultOperator is OfTypeResultOperator)
{
OfTypeResultOperator ofType = resultOperator as OfTypeResultOperator;
RdfClassAttribute type = ofType.SearchedItemType.TryGetCustomAttribute <RdfClassAttribute>();
if (type == null)
{
throw new ArgumentException("No RdfClass attrribute declared on type: " + ofType.SearchedItemType);
}
SparqlVariable s = ObjectVariable;
SparqlVariable p = VariableGenerator.CreatePredicateVariable();
SparqlVariable o = VariableGenerator.CreateObjectVariable();
WhereResource(s, p, o);
WhereResourceOfType(o, ofType.SearchedItemType);
}
else if (resultOperator is SkipResultOperator)
{
SkipResultOperator op = resultOperator as SkipResultOperator;
Offset(int.Parse(op.Count.ToString()));
}
else if (resultOperator is TakeResultOperator)
{
TakeResultOperator op = resultOperator as TakeResultOperator;
Limit(int.Parse(op.Count.ToString()));
}
else
{
throw new NotImplementedException(resultOperator.ToString());
}
}
}
public void HandleResultOperator_TakeAfterGroupExpression ()
{
_sqlStatementBuilder.TopExpression = Expression.Constant ("group");
var takeExpression = Expression.Constant (2);
var resultOperator = new TakeResultOperator (takeExpression);
_handler.HandleResultOperator (resultOperator, _sqlStatementBuilder, _generator, _stage, _context);
Assert.That (_sqlStatementBuilder.SqlTables.Count, Is.EqualTo (1));
Assert.That (((SqlTable) _sqlStatementBuilder.SqlTables[0]).TableInfo, Is.TypeOf (typeof (ResolvedSubStatementTableInfo)));
}
private static Expression HandleTake(
EntityQueryModelVisitor entityQueryModelVisitor, TakeResultOperator takeResultOperator)
=> Expression.Call(
entityQueryModelVisitor.LinqOperatorProvider.Take
.MakeGenericMethod(entityQueryModelVisitor.StreamedSequenceInfo.ResultItemType),
entityQueryModelVisitor.Expression, takeResultOperator.Count);
public void SetUp ()
{
_resultOperator = new TakeResultOperator (Expression.Constant (2));
}
public void GetConstantCount_NoConstantExpression ()
{
var resultOperator = new TakeResultOperator (new QuerySourceReferenceExpression (ExpressionHelper.CreateMainFromClause_Int ()));
resultOperator.GetConstantCount ();
}
private void ProcessTakeOperator(TakeResultOperator resultOperator)
{
_additionalCriteria.Add(q => q.SetMaxResults(resultOperator.GetConstantCount()));
}
private static Expression HandleTake(
EntityQueryModelVisitor entityQueryModelVisitor, TakeResultOperator takeResultOperator)
=> Expression.Call(
entityQueryModelVisitor.LinqOperatorProvider.Take
.MakeGenericMethod(entityQueryModelVisitor.Expression.Type.GetSequenceType()),
entityQueryModelVisitor.Expression,
new DefaultQueryExpressionVisitor(entityQueryModelVisitor)
.Visit(takeResultOperator.Count));
public void HandleResultOperator_TakeAfterSkipExpression ()
{
_sqlStatementBuilder.WhereCondition = null;
_sqlStatementBuilder.RowNumberSelector = Expression.Constant (5);
_sqlStatementBuilder.CurrentRowNumberOffset = Expression.Constant (3);
var takeExpression = Expression.Constant (2);
var resultOperator = new TakeResultOperator (takeExpression);
_handler.HandleResultOperator (resultOperator, _sqlStatementBuilder, _generator, _stage, _context);
var expectedWhereCondition = Expression.LessThanOrEqual (
_sqlStatementBuilder.RowNumberSelector, Expression.Add (_sqlStatementBuilder.CurrentRowNumberOffset, resultOperator.Count));
Assert.That (_sqlStatementBuilder.SqlTables.Count, Is.EqualTo (1));
SqlExpressionTreeComparer.CheckAreEqualTrees (expectedWhereCondition, _sqlStatementBuilder.WhereCondition);
}
public void GetConstantCount_NoConstantExpression()
{
var resultOperator = new TakeResultOperator(new QuerySourceReferenceExpression(ExpressionHelper.CreateMainFromClause_Int()));
resultOperator.GetConstantCount();
}
/// <summary>
/// Visits the result operator.
/// </summary>
/// <param name="resultOperator">Result operator.</param>
/// <param name="queryModel">Query model.</param>
/// <param name="index">Index.</param>
public override void VisitResultOperator(ResultOperatorBase resultOperator, QueryModel queryModel, int index)
{
if (resultOperator is SkipResultOperator)
{
SkipResultOperator @operator = resultOperator as SkipResultOperator;
this.commandBuilder.LimitParts.From = @operator.GetConstantCount();
}
else if (resultOperator is TakeResultOperator)
{
TakeResultOperator @operator = resultOperator as TakeResultOperator;
this.commandBuilder.LimitParts.Count = @operator.GetConstantCount();
}
else if (resultOperator is CountResultOperator || resultOperator is LongCountResultOperator)
{
this.commandBuilder.IsCount = true;
}
else if (resultOperator is FirstResultOperator || resultOperator is SingleResultOperator)
{
}
else if (resultOperator is DistinctResultOperator)
{
this.commandBuilder.IsDistinct = true;
}
else
{
if (resultOperator is AverageResultOperator)
{
throw new NotSupportedException();
}
if (resultOperator is MaxResultOperator)
{
throw new NotSupportedException();
}
if (resultOperator is MinResultOperator)
{
throw new NotSupportedException();
}
if (resultOperator is SumResultOperator)
{
throw new NotSupportedException();
}
if (resultOperator is ContainsResultOperator)
{
throw new NotSupportedException();
}
if (resultOperator is DefaultIfEmptyResultOperator)
{
throw new NotSupportedException();
}
if (resultOperator is ExceptResultOperator)
{
throw new NotSupportedException();
}
if (resultOperator is GroupResultOperator)
{
throw new NotSupportedException();
}
if (resultOperator is IntersectResultOperator)
{
throw new NotSupportedException();
}
if (resultOperator is OfTypeResultOperator)
{
throw new NotSupportedException();
}
if (resultOperator is UnionResultOperator)
{
throw new NotSupportedException();
}
}
}
public void TransformExpressions ()
{
var oldExpression = Expression.Constant (0);
var newExpression = Expression.Constant (1);
var resultOperator = new TakeResultOperator (oldExpression);
resultOperator.TransformExpressions (ex =>
{
Assert.That (ex, Is.SameAs (oldExpression));
return newExpression;
});
Assert.That (resultOperator.Count, Is.SameAs (newExpression));
}
private static Expression HandleTake(
EntityQueryModelVisitor entityQueryModelVisitor, TakeResultOperator takeResultOperator)
=> Expression.Call(
entityQueryModelVisitor.LinqOperatorProvider.Take
.MakeGenericMethod(entityQueryModelVisitor.StreamedSequenceInfo.ResultItemType),
entityQueryModelVisitor.Expression, takeResultOperator.Count);
public void SetUp()
{
_resultOperator = new TakeResultOperator(Expression.Constant(2));
}
private void VisitTakeResultOperator(TakeResultOperator takeResultOperation, Remotion.Linq.QueryModel queryModel, int index)
{
if (!(takeResultOperation.Count is System.Linq.Expressions.ConstantExpression))
{
throw new InvalidOperationException("Only constant expressions are supported for the Take operators.");
}
_query.Limit = Convert.ToInt32(((System.Linq.Expressions.ConstantExpression)takeResultOperation.Count).Value);
}