private IEnumerable <LinkDto> CreateLinksForApplications(
ApplicationsResourceParameters applicationsResourceParameters,
bool hasNext, bool hasPrevious)
{
var links = new List <LinkDto>();
// self
links.Add(
new LinkDto(CreateApplicationsResourceUri(applicationsResourceParameters,
ResourceUriType.Current)
, "self", "GET"));
if (hasNext)
{
links.Add(
new LinkDto(CreateApplicationsResourceUri(applicationsResourceParameters,
ResourceUriType.NextPage),
"nextPage", "GET"));
}
if (hasPrevious)
{
links.Add(
new LinkDto(CreateApplicationsResourceUri(applicationsResourceParameters,
ResourceUriType.PreviousPage),
"previousPage", "GET"));
}
return(links);
}
//public IEnumerable<Application> GetApplications(ApplicationsResourceParameters applicationsResourceParameters)
public PagedList <Application> GetApplications(ApplicationsResourceParameters applicationsResourceParameters)
{
// BEFORE APPLYING SORTING
//var collectionBeforePaging = _applicationInfoContext.Applications
// .Include(a => a.CountryOfResidence)
// .Include(a => a.CountryOfBirth)
// .OrderBy(a => a.Id)
// .ThenBy(a => a.Gender)
// .AsQueryable();
// Apply Sorting
var collectionBeforePaging =
_applicationInfoContext.Applications.ApplySort(applicationsResourceParameters.OrderBy,
_propertyMappingService.GetPropertyMapping <ApplicationDto, Application>());
// Filtering
// http://localhost:63292/api/applications?gender=Female
if (!string.IsNullOrEmpty(applicationsResourceParameters.Gender))
{
// trim & ignore casing
var genreForWhereClause = applicationsResourceParameters.Gender
.Trim().ToLowerInvariant();
collectionBeforePaging = collectionBeforePaging
.Where(a => a.Gender.ToLowerInvariant() == genreForWhereClause);
}
// Searching
//http://localhost:63292/api/applications?searchQuery=vaibhav
if (!string.IsNullOrEmpty(applicationsResourceParameters.SearchQuery))
{
// trim & ignore casing
var searchQueryForWhereClause = applicationsResourceParameters.SearchQuery
.Trim().ToLowerInvariant();
collectionBeforePaging = collectionBeforePaging
.Where(a => a.Gender.ToLowerInvariant().Contains(searchQueryForWhereClause) ||
a.FirstName.ToLowerInvariant().Contains(searchQueryForWhereClause) ||
a.LastName.ToLowerInvariant().Contains(searchQueryForWhereClause));
}
// Adding Page Number and Page Size
// http://localhost:63292/api/applications?pageNumber=2&pageSize=5
return(PagedList <Application> .Create(collectionBeforePaging,
applicationsResourceParameters.PageNumber,
applicationsResourceParameters.PageSize));
//return _applicationInfoContext.Applications
// .Include(a => a.CountryOfResidence)
// .Include(a => a.CountryOfBirth)
// .OrderBy(a => a.Id)
// //.Include(e => e.ApplicationQualifications)
// //.ThenInclude(q => q.Qualification)
// .ToList();
}
private string CreateApplicationsResourceUri(
ApplicationsResourceParameters applicationsResourceParameters,
ResourceUriType type)
{
switch (type)
{
case ResourceUriType.PreviousPage:
return(_urlHelper.Link("GetApplications",
new
{
fields = applicationsResourceParameters.Fields,
orderBy = applicationsResourceParameters.OrderBy,
searchQuery = applicationsResourceParameters.SearchQuery,
gender = applicationsResourceParameters.Gender,
pageNumber = applicationsResourceParameters.PageNumber - 1,
pageSize = applicationsResourceParameters.PageSize
}));
case ResourceUriType.NextPage:
return(_urlHelper.Link("GetApplications",
new
{
fields = applicationsResourceParameters.Fields,
orderBy = applicationsResourceParameters.OrderBy,
searchQuery = applicationsResourceParameters.SearchQuery,
gender = applicationsResourceParameters.Gender,
pageNumber = applicationsResourceParameters.PageNumber + 1,
pageSize = applicationsResourceParameters.PageSize
}));
default:
return(_urlHelper.Link("GetApplications",
new
{
fields = applicationsResourceParameters.Fields,
orderBy = applicationsResourceParameters.OrderBy,
searchQuery = applicationsResourceParameters.SearchQuery,
gender = applicationsResourceParameters.Gender,
pageNumber = applicationsResourceParameters.PageNumber,
pageSize = applicationsResourceParameters.PageSize
}));
}
}
public IActionResult GetApplications(
ApplicationsResourceParameters applicationsResourceParameters, // AuthorsResourceParameters => URL Optional Input Parameters for Paging and filtering
[FromHeader(Name = "Accept")] string mediaType // HATEOAS and Content Negotiation => Accept : //application/vnd.vaibhav.hateoas+json
)
{
try
{
// Check if non existing property has been requested
// This is dynamic Mapping of AuthorDto to Entity.Author
// e.g. http://localhost:6058/api/applications?orderBy=dateofbirth => In this case => 'dateofbirth' does not exist
if (!_propertyMappingService.ValidMappingExistsFor <ApplicationDto, Application>
(applicationsResourceParameters.OrderBy))
{
return(BadRequest());
}
if (!_typeHelperService.TypeHasProperties <ApplicationDto>
(applicationsResourceParameters.Fields))
{
return(BadRequest());
}
var applicationsFromRepo = _applicationInfoRepository.GetApplications(applicationsResourceParameters);
var results = Mapper.Map <IEnumerable <ApplicationDto> >(applicationsFromRepo);
#region Wrapping HATEOAS (Dynamic Approach) in Content Negotiation => Accept : application/vnd.vaibhav.hateoas+json
if (mediaType == "application/vnd.vaibhav.hateoas+json")
{
var paginationMetadata = new
{
totalCount = applicationsFromRepo.TotalCount,
pageSize = applicationsFromRepo.PageSize,
currentPage = applicationsFromRepo.CurrentPage,
totalPages = applicationsFromRepo.TotalPages
};
Response.Headers.Add("X-Pagination",
Newtonsoft.Json.JsonConvert.SerializeObject(paginationMetadata));
#region Supporting HATEOAS (Dynamic Approach)
var links = CreateLinksForApplications(applicationsResourceParameters,
applicationsFromRepo.HasNext, applicationsFromRepo.HasPrevious);
var shapedApplications = results.ShapeData(applicationsResourceParameters.Fields);
var shapedApplicationsWithLinks = shapedApplications.Select(application =>
{
var applicationsAsDictionary = application as IDictionary <string, object>;
var authorLinks = CreateLinksForApplication(
(Int32)applicationsAsDictionary["Id"], applicationsResourceParameters.Fields);
applicationsAsDictionary.Add("links", authorLinks);
return(applicationsAsDictionary);
});
var linkedCollectionResource = new
{
value = shapedApplicationsWithLinks,
links = links
};
return(Ok(linkedCollectionResource));
#endregion
}
#endregion
#region Accept : application/json
else
{
var previousPageLink = applicationsFromRepo.HasPrevious ?
CreateApplicationsResourceUri(applicationsResourceParameters,
ResourceUriType.PreviousPage) : null;
var nextPageLink = applicationsFromRepo.HasNext ?
CreateApplicationsResourceUri(applicationsResourceParameters,
ResourceUriType.NextPage) : null;
var paginationMetadata = new
{
totalCount = applicationsFromRepo.TotalCount,
pageSize = applicationsFromRepo.PageSize,
currentPage = applicationsFromRepo.CurrentPage,
totalPages = applicationsFromRepo.TotalPages,
previousPageLink = previousPageLink,
nextPageLink = nextPageLink
};
Response.Headers.Add("X-Pagination",
Newtonsoft.Json.JsonConvert.SerializeObject(paginationMetadata));
return(Ok(results.ShapeData(applicationsResourceParameters.Fields)));
}
#endregion
//return Ok(results.ShapeData(applicationsResourceParameters.Fields));
// Before SHAPING of data
//return Ok(results);
}
catch (Exception e)
{
_logger.LogInformation(e.Message);
throw;
}
}
