public Task <QueryResult <Customer> > QueryAsync(CustomerQuery query)
{
// filter
var filteredResults = CustomerList.Where(c => query.Filter.MinAge == null || c.Age >= query.Filter.MinAge).ToList();
var totalEntities = filteredResults.Count;
// sort
IEnumerable <Customer> orderedResult;
switch (query.SortBy.SortType)
{
case SortTypes.Ascending:
switch (query.SortBy.PropertyName)
{
case CustomerSortProperties.Age:
orderedResult = filteredResults.OrderBy(c => c.Age);
break;
case CustomerSortProperties.Name:
orderedResult = filteredResults.OrderBy(c => c.Name);
break;
case null:
orderedResult = filteredResults;
break;
default:
throw new ArgumentOutOfRangeException();
}
break;
case SortTypes.Descending:
switch (query.SortBy.PropertyName)
{
case CustomerSortProperties.Age:
orderedResult = filteredResults.OrderByDescending(c => c.Age);
break;
case CustomerSortProperties.Name:
orderedResult = filteredResults.OrderByDescending(c => c.Name);
break;
case null:
orderedResult = filteredResults;
break;
default:
throw new ArgumentOutOfRangeException();
}
break;
case SortTypes.None:
orderedResult = filteredResults;
break;
default:
throw new ArgumentOutOfRangeException();
}
// pagination
var resultEntities = ClipToPagination(orderedResult, query.Pagination);
var result = new QueryResult <Customer>
{
Entities = resultEntities,
TotalCountOfEnties = totalEntities
};
return(Task.FromResult(result));
}
// copy constructor
public CustomerQuery(CustomerQuery customerQuery) : base(customerQuery)
{
}