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;
}
}
