public override void ModifyQueryDescription(QueryDescriptionBuilder queryDescription, Type resultType)
{
var pageNumberExpr = FirstParameter as ConstantExpression;
var pageSizeExpr = PageSize as ConstantExpression;
if (pageNumberExpr == null || pageSizeExpr == null)
{
return;
}
int?pageNumber = pageNumberExpr.Value as int?;
int?pageSize = pageSizeExpr.Value as int?;
if (pageNumber.HasValue && pageSize.HasValue)
{
queryDescription.AddSkipResultFilter(resultType, pageSize.Value * (pageNumber.Value - 1));
queryDescription.AddTakeResultFilter(resultType, pageSize.Value);
}
}
/// <summary>
/// Visits the result operator.
/// </summary>
/// <param name="resultOperator">The result operator.</param>
/// <param name="queryModel">The query model.</param>
/// <param name="index">The index.</param>
/// <remarks></remarks>
public override void VisitResultOperator(ResultOperatorBase resultOperator, Remotion.Linq.QueryModel queryModel, int index)
{
if (typeof(CountResultOperator).IsAssignableFrom(resultOperator.GetType()))
{
//_queryDescription.SetResultFilterClause(queryModel.MainFromClause.ItemType, ResultFilterType.Count, 0);
_queryDescription.AddResultFilter(queryModel.MainFromClause.ItemType, ResultFilterType.Count, 0);
}
if (typeof(SingleResultOperator).IsAssignableFrom(resultOperator.GetType()))
{
var op = resultOperator as SingleResultOperator;
var filter = op.ReturnDefaultWhenEmpty ? ResultFilterType.SingleOrDefault : ResultFilterType.Single;
//_queryDescription.SetResultFilterClause(queryModel.MainFromClause.ItemType, filter, 0);
_queryDescription.AddResultFilter(queryModel.MainFromClause.ItemType, filter, 0);
}
if (typeof(TakeResultOperator).IsAssignableFrom(resultOperator.GetType()))
{
var firstResultOperator = resultOperator as TakeResultOperator;
var countExpression = firstResultOperator.Count as ConstantExpression;
var count = Convert.ToInt32(countExpression.Value);
//_queryDescription.SetTakeResultFilter(queryModel.MainFromClause.ItemType, count);
_queryDescription.AddTakeResultFilter(queryModel.MainFromClause.ItemType, count);
}
var skipResultOp = resultOperator as SkipResultOperator;
if (skipResultOp != null)
{
var countExpression = skipResultOp.Count as ConstantExpression;
var count = Convert.ToInt32(countExpression.Value);
//_queryDescription.SetSkipResultFilter(queryModel.MainFromClause.ItemType, count);
_queryDescription.AddSkipResultFilter(queryModel.MainFromClause.ItemType, count);
}
if (resultOperator is AnyResultOperator)
{
//_queryDescription.SetResultFilterClause(queryModel.MainFromClause.ItemType, ResultFilterType.Any, 0);
_queryDescription.AddResultFilter(queryModel.MainFromClause.ItemType, ResultFilterType.Any, 0);
}
var allResultOp = resultOperator as AllResultOperator;
if (allResultOp != null)
{
var criteriaExpression = this.GetCriteriaExpression(queryModel, allResultOp.Predicate);
_queryDescription.SetCriteria(criteriaExpression);
//_queryDescription.SetResultFilterClause(queryModel.MainFromClause.ItemType, ResultFilterType.All, 0);
_queryDescription.AddResultFilter(queryModel.MainFromClause.ItemType, ResultFilterType.All, 0);
}
var firstResultOp = resultOperator as FirstResultOperator;
if (firstResultOp != null)
{
//this._queryDescription.SetResultFilterClause(
// queryModel.MainFromClause.ItemType,
// firstResultOp.ReturnDefaultWhenEmpty ? ResultFilterType.FirstOrDefault : ResultFilterType.First,
// 0);
this._queryDescription.AddResultFilter(
queryModel.MainFromClause.ItemType,
firstResultOp.ReturnDefaultWhenEmpty ? ResultFilterType.FirstOrDefault : ResultFilterType.First,
0);
}
var lastResultOp = resultOperator as LastResultOperator;
if (lastResultOp != null)
{
this._queryDescription.AddResultFilter(
queryModel.MainFromClause.ItemType,
lastResultOp.ReturnDefaultWhenEmpty ? ResultFilterType.LastOrDefault : ResultFilterType.Last,
0);
}
base.VisitResultOperator(resultOperator, queryModel, index);
}