/// <summary>
/// Initializes the new instance of a decrementing enumerator for a double linked collection.
/// </summary>
/// <param name="collection">The double linked collection to enumerate.</param>
/// <param name="lower">The lower node to use as a reference for incremental enumeration.</param>
/// <param name="upper">The upper node to use as a reference for incremental enumeration.</param>
internal Decrementor(ListLinks <TList, TNode> collection, TNode upper = null, TNode lower = null)
{
if (collection != null)
{
_collection = collection;
_lower = lower ?? _collection.Head;
_upper = _node = upper ?? _collection.Tail;
_current = null;
}
}
/// <summary>
/// Initializes the new instance of an decrementing enumerable for a double linked collection.
/// </summary>
/// <param name="collection">The double linked collection to enumerate.</param>
/// <param name="upper">The upper node to use as a reference for incremental enumeration.</param>
/// <param name="lower">The lower node to use as a reference for incremental enumeration.</param>
public Collection(ListLinks <TList, TNode> collection, TNode upper = null, TNode lower = null)
{
_collection = collection;
if (lower == null || lower.Parent == collection)
{
_lower = lower;
}
else
{
throw new ArgumentException($"The lower node is not linked to requested list: {lower}.", nameof(lower));
}
if (upper == null || upper.Parent == collection)
{
_upper = upper;
}
else
{
throw new ArgumentException($"The upper node is not linked to requested list: {upper}.", nameof(upper));
}
}
/// <summary>
/// Initializes the new instance of a decrementing enumerable for a double linked collection.
/// </summary>
/// <param name="collection">The double linked collection to enumerate.</param>
public Collection(ListLinks <TList, TNode> collection)
{
_collection = collection;
}
public async Task <ActionResult <CategoriesResponse> > GetCategories(
[FromQuery] string code = null,
[FromQuery] string name = null, [FromQuery] bool?status = null,
[FromQuery] int?limit = null,
[FromQuery] int?offset = null)
{
if ((limit != null && offset == null) || (limit == null && offset != null))
{
return(BadRequest());
}
if (limit <= 0 || offset <= 0)
{
return(BadRequest());
}
List <Category> lst = null;
ListLinks listLinks = null;
if (limit == null)
{
lst = await _context.Categories.Where(c =>
(code == null || c.Code == code) && (name == null || c.Name == name) &&
(status == null || c.Status == status)).ToListAsync();
}
else
{
var myLimit = limit ?? 0;
var myOffset = offset ?? 0;
var count = (await _context.Categories.Where(c =>
(code == null || c.Code == code) && (name == null || c.Name == name) &&
(status == null || c.Status == status)).ToListAsync())?.Count;
lst = await _context.Categories.Where(c =>
(code == null || c.Code == code) && (name == null || c.Name == name) &&
(status == null || c.Status == status)).Skip((myOffset - 1) * myLimit).Take(myLimit).ToListAsync();
listLinks = new ListLinks
{
Base = $"{this.Request.Scheme}://{this.Request.Host}{this.Request.PathBase}"
};
listLinks = CreateResponseListLinks(lst, myLimit, myOffset, count ?? 0);
}
var categories = _mapper.Map <List <DtoCategory> >(lst);
var categoriesList = categories.Select(category => CreateLinksForCategory(category));
return(new CategoriesResponse
{
Value = categoriesList.ToList(),
Meta = new DtoMeta
{
ResponseId = Guid.NewGuid(),
Date = DateTimeOffset.UtcNow,
Status = Status.Succeeded,
},
Size = limit,
Start = offset,
_links = listLinks,
});
}
