public bool TryGenerate(IPContext context, string input, out ISortParticle <TEntity> particle)
{
input = input.Trim();
bool isDescending = false;
string name;
if (input.StartsWith("-"))
{
isDescending = true;
name = input.Substring(1).TrimStart();
}
else
{
name = input;
}
if (!TryGetPropertyByName(name, out var property))
{
particle = null;
return(false);
}
particle = new ByPropertyParticle <TEntity>(
property: property,
descending: isDescending
);
return(true);
}
public static bool TryParseCsv <T>(
this IPContext pContext,
string input,
out IEnumerable <ISortParticle <T> > particles
)
where T : class
{
var particlesRaw = new List <ISortParticle <T> >();
var generators = pContext.GetGenerators <T, ISortParticle <T> >();
var splitInput = input
.Split(',');
bool wasAbleToParse = true;
foreach (var sort in splitInput)
{
ISortParticle <T> particle = null;
wasAbleToParse &= generators.Any(x => x.TryGenerate(pContext, sort, out particle));
if (!(particle is null))
{
particlesRaw.Add(particle);
}
}
particles = wasAbleToParse ?
particlesRaw :
Array.Empty <ISortParticle <T> >();
return(wasAbleToParse);
}
public bool TryGenerate(IPContext context, string input, out ISortParticle <Post> particle)
{
var descending = input.StartsWith('-');
var remaining = descending ? input.Substring(1) : input;
if (!remaining.Trim().Equals("Popularity", System.StringComparison.OrdinalIgnoreCase))
{
particle = null;
return(false);
}
particle = new SortPostByPopularityParticle(descending);
return(true);
}