private IEnumerable <LinkDTO> CreateLinksForSupermarkets(SupermarketResourceParameters supermarketResourceParameters,
bool hasNext, bool hasPrevious)
{
var links = new List <LinkDTO>();
// self
links.Add(
new LinkDTO(CreateSupermarketResourceUri(supermarketResourceParameters,
ResourceUriType.Current)
, "self", "GET"));
if (hasNext)
{
links.Add(
new LinkDTO(CreateSupermarketResourceUri(supermarketResourceParameters,
ResourceUriType.NextPage),
"nextPage", "GET"));
}
if (hasPrevious)
{
links.Add(
new LinkDTO(CreateSupermarketResourceUri(supermarketResourceParameters,
ResourceUriType.PreviousPage),
"previousPage", "GET"));
}
return(links);
}
private string CreateSupermarketResourceUri(
SupermarketResourceParameters supermarketResourceParameters,
ResourceUriType type)
{
switch (type)
{
case ResourceUriType.PreviousPage:
return(_urlHelper.Link("GetSupermarkets",
new
{
fields = supermarketResourceParameters.Fields,
orderBy = supermarketResourceParameters.OrderBy,
searchQuery = supermarketResourceParameters.SearchQuery,
pageNumber = supermarketResourceParameters.PageNumber - 1,
pageSize = supermarketResourceParameters.PageSize
}));
case ResourceUriType.NextPage:
return(_urlHelper.Link("GetSupermarkets",
new
{
fields = supermarketResourceParameters.Fields,
orderBy = supermarketResourceParameters.OrderBy,
searchQuery = supermarketResourceParameters.SearchQuery,
pageNumber = supermarketResourceParameters.PageNumber + 1,
pageSize = supermarketResourceParameters.PageSize
}));
case ResourceUriType.Current:
default:
return(_urlHelper.Link("GetSupermarkets",
new
{
fields = supermarketResourceParameters.Fields,
orderBy = supermarketResourceParameters.OrderBy,
searchQuery = supermarketResourceParameters.SearchQuery,
pageNumber = supermarketResourceParameters.PageNumber,
pageSize = supermarketResourceParameters.PageSize
}));
}
}
public PagedList <Supermarket> GetAllSupermarkets(SupermarketResourceParameters supermarketResourceParameters)
{
//var collectionBeforePaging = _context.Supermarkets.OrderBy(s => s.Location).AsQueryable();
var collectionBeforePaging =
_context.Supermarkets.ApplySort(supermarketResourceParameters.OrderBy,
_propertyMappingService.GetPropertyMapping <SupermarketDTO, Supermarket>());
if (!string.IsNullOrEmpty(supermarketResourceParameters.SearchQuery))
{
// trim & ignore casing
var searchQueryForWhereClause = supermarketResourceParameters.SearchQuery
.Trim().ToLowerInvariant();
collectionBeforePaging = collectionBeforePaging
.Where(s => s.Location.ToLowerInvariant().Contains(searchQueryForWhereClause));
}
return(PagedList <Supermarket> .Create(collectionBeforePaging,
supermarketResourceParameters.PageNumber,
supermarketResourceParameters.PageSize));
}
public IActionResult GetSupermarkets(SupermarketResourceParameters supermarketResourceParameters,
[FromHeader(Name = "Accept")] string mediaType)
{
// check mappings are valid
if (!_propertyMappingService.ValidMappingExistsFor <SupermarketDTO, Supermarket>
(supermarketResourceParameters.OrderBy))
{
return(BadRequest());
}
// check all fields are valid
if (!_typeHelperService.TypeHasProperties <SupermarketDTO>
(supermarketResourceParameters.Fields))
{
return(BadRequest());
}
var supermarketsFromRepo = _supermarketRepository.GetAllSupermarkets(supermarketResourceParameters);
var supermarkets = Mapper.Map <IEnumerable <SupermarketDTO> >(supermarketsFromRepo);
if (mediaType == "application/vnd.idp.hateoas+json")
{
// Pagination
var paginationMetadata = new
{
totalCount = supermarketsFromRepo.TotalCount,
pageSize = supermarketsFromRepo.PageSize,
currentPage = supermarketsFromRepo.CurrentPage,
totalPages = supermarketsFromRepo.TotalPages
};
Response.Headers.Add("X-Pagination",
JsonConvert.SerializeObject(paginationMetadata));
var links = CreateLinksForSupermarkets(supermarketResourceParameters,
supermarketsFromRepo.HasNext, supermarketsFromRepo.HasPrevious);
var shapedSupermarkets = supermarkets.ShapeData(supermarketResourceParameters.Fields);
var shapedSupermarketsWithLinks = shapedSupermarkets.Select(supermarket =>
{
var supermarketAsDictionary = supermarket as IDictionary <string, object>;
var supermarketLinks = CreateLinksForSupermarket(
(int)supermarketAsDictionary["SupermarketId"], supermarketResourceParameters.Fields);
supermarketAsDictionary.Add("links", supermarketLinks);
return(supermarketAsDictionary);
});
var linkedCollectionResource = new
{
value = shapedSupermarketsWithLinks,
links = links
};
return(Ok(linkedCollectionResource));
}
else
{
var previousPageLink = supermarketsFromRepo.HasPrevious ?
CreateSupermarketResourceUri(supermarketResourceParameters,
ResourceUriType.PreviousPage) : null;
var nextPageLink = supermarketsFromRepo.HasNext ?
CreateSupermarketResourceUri(supermarketResourceParameters,
ResourceUriType.NextPage) : null;
var paginationMetadata = new
{
previousPageLink,
nextPageLink,
totalCount = supermarketsFromRepo.TotalCount,
pageSize = supermarketsFromRepo.PageSize,
currentPage = supermarketsFromRepo.CurrentPage,
totalPages = supermarketsFromRepo.TotalPages
};
Response.Headers.Add("X-Pagination",
JsonConvert.SerializeObject(paginationMetadata));
return(Ok(supermarkets.ShapeData(supermarketResourceParameters.Fields)));
}
}
