public Expression Build(Expression source, IReadOnlyList <OeSkipTokenNameValue> skipTokenNameValues, OrderByClause uniqueOrderBy)
{
OrderProperty[] orderProperties = CreateOrderProperies(source, skipTokenNameValues, uniqueOrderBy);
Expression filter = CreateFilterExpression(_isDatabaseNullHighestValue, orderProperties);
LambdaExpression lambda = Expression.Lambda(filter, _visitor.Parameter);
MethodInfo whereMethodInfo = OeMethodInfoHelper.GetWhereMethodInfo(_visitor.Parameter.Type);
return(Expression.Call(whereMethodInfo, source, lambda));
}
private static MethodCallExpression CreateWhereExpression(ParameterExpression sourceParameter, Expression subquery, IEdmNavigationProperty edmNavigationProperty)
{
Type subqueryType = OeExpressionHelper.GetCollectionItemType(subquery.Type);
var subqueryParameter = Expression.Parameter(subqueryType, subqueryType.Name);
BinaryExpression joinExpression = GetJoinExpression(sourceParameter, subqueryParameter, edmNavigationProperty);
LambdaExpression predicate = Expression.Lambda(joinExpression, subqueryParameter);
MethodInfo whereMethodInfo = OeMethodInfoHelper.GetWhereMethodInfo(subqueryType);
return(Expression.Call(whereMethodInfo, subquery, predicate));
}
private MethodCallExpression ApplyFilter(Expression source, FilterTransformationNode transformation)
{
Type sourceType = OeExpressionHelper.GetCollectionItemType(source.Type);
ParameterExpression sourceParameter = Expression.Parameter(sourceType);
var visitor = CreateVisitor(sourceParameter);
if (_aggProperties.Count > 0)
{
visitor.TuplePropertyByAliasName = GetTuplePropertyByAliasName;
}
Expression e = visitor.TranslateNode(transformation.FilterClause.Expression);
MethodInfo whereMethodInfo = OeMethodInfoHelper.GetWhereMethodInfo(sourceParameter.Type);
LambdaExpression lambda = Expression.Lambda(e, sourceParameter);
return(Expression.Call(whereMethodInfo, source, lambda));
}