public ProjectionEvaluator(ParameterAggregator parameterAggregator, System.Type inputType, Func<Expression, bool> predicate)
{
_parameterAggregator = parameterAggregator;
_inputParameter = Expression.Parameter(inputType, "input");
_predicate = predicate;
_hqlTreeBuilder = new HqlTreeBuilder();
_stack = new HqlNodeStack(_hqlTreeBuilder);
}
public static CommandData GenerateHqlQuery(QueryModel queryModel, ParameterAggregator aggregator)
{
// Rewrite aggregate group by statements
new AggregatingGroupByRewriter().VisitQueryModel(queryModel);
// Swap out non-aggregating group bys
new NonAggregatingGroupByRewriter().VisitQueryModel(queryModel);
// Merge aggregating result operators (distinct, count, sum etc) into the select clause
new MergeAggregatingResultsRewriter().VisitQueryModel(queryModel);
var visitor = new QueryModelVisitor(aggregator);
visitor.VisitQueryModel(queryModel);
return visitor.GetHqlCommand();
}
private QueryModelVisitor(ParameterAggregator parameterAggregator)
{
_hqlTreeBuilder = new HqlTreeBuilder();
_parameterAggregator = parameterAggregator;
}
