protected Page PageResults(int total, int ordinal = -1)
{
var pageSize = RequestContext.ContainsHeader(WebHeaders.PerPage) ? int.Parse(RequestContext.GetHeaderValue(WebHeaders.PerPage)) : 10;
//TODO: need to populate according to specific device settings
int start = 1, end = total;
if (!RequestContext.ContainsHeader(WebHeaders.Page) && !RequestContext.ContainsHeader(WebHeaders.PageForId))
{
ResponseContext.SetProperties(Request.Properties, WebHeaders.AcceptRanges, WebHeaders.Page);
}
else
{
var maxPage = total % pageSize == 0 ? total / pageSize : total / pageSize + 1;
if (Request != null)
{
ResponseContext.SetProperties(Request.Properties, WebHeaders.MaxPage, maxPage.ToString());
}
var page = -1;
if (ordinal > 0)
{
var previousPage = (ordinal % pageSize == 0) ? (ordinal / pageSize) - 1 : ordinal / pageSize;
page = previousPage + 1;
start = previousPage * pageSize + 1;
end = (start + pageSize - 1) <= total ? (start + pageSize - 1) : total;
}
else
{
page = int.Parse(RequestContext.GetHeaderValue(WebHeaders.Page));
if (page <= maxPage)
{
start = ((page - 1) * pageSize) + 1;
end = page * pageSize <= total ? page * pageSize : total;
}
else
{
start = 0;
end = 0;
}
}
if (start > 0 && end > 0 && page > 0)
{
if (Request != null)
{
ResponseContext.SetProperties(Request.Properties, WebHeaders.ContentRange, string.Format("{0}-{1}/{2}", start, end, total));
ResponseContext.SetProperties(Request.Properties, WebHeaders.PreviousPage, (start == 1 ? 0 : page - 1).ToString());
ResponseContext.SetProperties(Request.Properties, WebHeaders.NextPage, (end < total ? page + 1 : 0).ToString());
}
}
}
return(new Page()
{
Start = start, End = end
});
}
protected void AppendLocation(string resourceLocation, int resourceId)
{
if (resourceId > 0)
{
ResponseContext.SetProperties(Request.Properties, WebHeaders.Location, Request.RequestUri.AbsoluteUri + resourceLocation + resourceId);
}
else
{
throw new WebApiException(ErrorList.UnableToProcess, System.Net.HttpStatusCode.NotAcceptable);
}
}