public ValueTask <IQueryable> Visit(ExecuteWhereStage executeWhereStage)
{
Debug.Assert(queryable != null);
var whereExecutor = _whereExecutorFactory.GetWhereExecutor(executeWhereStage);
return(whereExecutor.Execute(queryable, executeWhereStage));
}
public IWhereExecutor GetWhereExecutor(ExecuteWhereStage executeWhereStage)
{
if (!executors.TryGetValue(executeWhereStage.EntityType, out var executor))
{
var t = typeof(DefaultWhereExecutor <>).MakeGenericType(executeWhereStage.EntityType);
executor = (IWhereExecutor)Activator.CreateInstance(t);
executors.Add(executeWhereStage.EntityType, executor);
}
return(executor);
}
protected Expression <Func <Entity, bool> > GetLambda(ExecuteWhereStage whereStage)
{
return(Expression.Lambda <Func <Entity, bool> >(whereStage.Expression, whereStage.ParameterExpression));
}
public abstract ValueTask <IQueryable <Entity> > ExecuteWhere(IQueryable <Entity> queryable, ExecuteWhereStage whereStage);
public async ValueTask <IQueryable> Execute(IQueryable queryable, ExecuteWhereStage executeWhereStage)
{
return(await ExecuteWhere((IQueryable <Entity>) queryable, executeWhereStage));
}
public override ValueTask <IQueryable <Entity> > ExecuteWhere(IQueryable <Entity> queryable, ExecuteWhereStage whereStage)
{
return(new ValueTask <IQueryable <Entity> >(queryable.Where(GetLambda(whereStage))));
}
