/// <summary>
/// Sets the pagination links.
/// </summary>
/// <param name="options">Application Global settings.</param>
/// <param name="httpContext">The Http Context of the request</param>
internal void SetLinks(NexusatAspNetCoreOptions options, HttpContext context)
{
string requestUrl = context.Request.GetEncodedPathAndQuery();
// Only one of the following condition can hold
/// <see cref="Builders.ApiEnumResponseBuilder{T}"/>
Debug.Assert(ItemsCount.HasValue ^ HasNextPage);
PageSize = PaginationCursor.PageSize;
if (PaginationCursor.IsPageSizeBounded) // If unbounded links are not generated
{
Links = new PaginationLinks();
var linkBuilder = new PaginationInfoLinkBuilder(
context.Request.GetEncodedPathAndQuery(),
options.PaginationPageIndexName,
options.PaginationPageSizeName,
PaginationCursor.PageSize
);
// First
Links.First = linkBuilder.GetLink(1);
// Current
Links.Current = linkBuilder.GetLink(PaginationCursor.PageIndex);
// Previous
if (PaginationCursor.PageIndex > 1)
{
Links.Previous = linkBuilder.GetLink(PaginationCursor.PageIndex - 1);
}
if (ItemsCount.HasValue)
{ // calculate links and pageCount
int pageCount =
(ItemsCount.Value + PaginationCursor.PageSize - 1) / PaginationCursor.PageSize;
PagesCount = pageCount;
if (pageCount > PaginationCursor.PageIndex)
{
// Next
Links.Next = linkBuilder.GetLink(PaginationCursor.PageIndex + 1);
}
// Last
Links.Last = linkBuilder.GetLink(pageCount);
}
else if (HasNextPage) // implies hasn't itemsCount
{ // calculate links except the "last"
Links.Next = linkBuilder.GetLink(PaginationCursor.PageIndex + 1);
}
}
else // Unbounded requests have only 1 page of data
{
PagesCount = 1;
}
}
public void TestUrlLinks(string originalLink, int pageIndex, int pageSize)
{
// Setup
var linkBuilder = new PaginationInfoLinkBuilder(originalLink, pageIndexKeyName, pageSizeKeyName, pageSize);
Output.WriteLine("Original URL: {0}", originalLink);
// Act
var actual = linkBuilder.GetLink(pageIndex);
Output.WriteLine("Altered URL: {0}", actual);
// Check
Assert.Contains("?", actual);
Assert.Contains("&", actual);
Assert.DoesNotContain("&?", actual);
Assert.DoesNotContain("?&", actual);
Assert.DoesNotContain("&&", actual);
Assert.DoesNotContain("??", actual);
Assert.True(CheckPageIndex(actual, pageIndex));
Assert.True(CheckPageSize(actual, pageSize));
}