/// <summary>
/// Create the HATEOAS links for allowable hyperlink actions via HTTP navigation
/// </summary>
/// <param name="vectorWrapper">the containing wrapper class that has a value and links section</param>
/// <param name="reqParams">the pagination request parameters from the http header</param>
/// <returns>the existing nodeList entry plus the allowable links</returns>
private Models.LinkedCollectionWrapperDto <Models.VectorWithLinksDto> CreateLinksForNodeVectorList(
Models.LinkedCollectionWrapperDto <Models.VectorWithLinksDto> vectorWrapper,
DataRequestParams reqParams)
{
vectorWrapper.Links.Add(new Models.LinkDto(
_urlHelper.Link("GetVectorsForNode", new {}),
"self",
"GET"
));
// next page
vectorWrapper.Links.Add(new Models.LinkDto(
CreateNavLink("GetVectorsForNode", reqParams, UrlNavigationType.Next),
"next_page",
"GET"
));
// previous page
vectorWrapper.Links.Add(new Models.LinkDto(
CreateNavLink("GetVectorsForNode", reqParams, UrlNavigationType.Previous),
"previous_page",
"GET"
));
// current page
vectorWrapper.Links.Add(new Models.LinkDto(
CreateNavLink("GetVectorsForNode", reqParams, UrlNavigationType.None),
"current_page",
"GET"
));
return(vectorWrapper);
}
public async Task <IActionResult> GetVectorsForNode(int nodeId,
DataRequestParams reqParams,
[FromHeader(Name = "Accept")] string mediaType)
{
var nodeVectors = await _vectorRepo.SelectVectorsByNodeAsync(nodeId, reqParams);
if (nodeVectors == null)
{
return(NotFound());
}
if (mediaType == "application/unionall+json")
{
var providedVectors = Mapper.Map <IEnumerable <VectorWithLinksDto> >(nodeVectors);
// add the HATEOAS links for each vectorDTO
providedVectors = providedVectors.Select(vector =>
{
vector = CreateLinksForVector(vector);
return(vector);
});
var wrapper = new Models.LinkedCollectionWrapperDto <VectorWithLinksDto>(providedVectors);
return(Ok(CreateLinksForNodeVectorList(wrapper, reqParams)));
}
else
{
// add the pagination links
Response.Headers.Add("LinkCurrent", CreateNavLink("GetVectorsForNode", reqParams, UrlNavigationType.None));
Response.Headers.Add("LinkPrevious", CreateNavLink("GetVectorsForNode", reqParams, UrlNavigationType.Previous));
Response.Headers.Add("LinkNext", CreateNavLink("GetVectorsForNode", reqParams, UrlNavigationType.Next));
var providedVectors = Mapper.Map <IEnumerable <VectorDto> >(nodeVectors);
return(Ok(providedVectors));
}
}
