/// <summary>
/// Applies the offset pagination algorithm to the <paramref name="query"/>.
/// </summary>
/// <param name="query">
/// The query on which the the offset pagination algorithm shall be applied to.
/// </param>
/// <param name="context">
/// The field resolver context.
/// </param>
/// <param name="defaultPageSize">
/// The default page size if no boundaries are set.
/// </param>
/// <param name="totalCount">
/// The total count if already known.
/// </param>
/// <param name="cancellationToken">
/// The cancellation token.
/// </param>
/// <typeparam name="TEntity">
/// The entity type.
/// </typeparam>
/// <returns>
/// Returns a collection segment instance that represents the result of applying the
/// offset paging algorithm to the provided <paramref name="query"/>.
/// </returns>
public static ValueTask <CollectionSegment <TEntity> > ApplyOffsetPaginationAsync <TEntity>(
this IQueryable <TEntity> query,
IResolverContext context,
int?defaultPageSize = null,
int?totalCount = null,
CancellationToken cancellationToken = default)
{
if (query is null)
{
throw new ArgumentNullException(nameof(query));
}
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
var skip = context.ArgumentValue <int?>(OffsetPagingArgumentNames.Skip);
var take = context.ArgumentValue <int?>(OffsetPagingArgumentNames.Take) ??
defaultPageSize;
var arguments = new OffsetPagingArguments(skip, take);
if (totalCount is null && context.IsTotalCountSelected())
{
totalCount = query.Count();
}
return(QueryableOffsetPagination <TEntity> .Instance.ApplyPaginationAsync(
query,
arguments,
totalCount,
cancellationToken));
}
/// <summary>
/// Applies the cursor pagination algorithm to the <paramref name="query"/>.
/// </summary>
/// <param name="query">
/// The query on which the the cursor pagination algorithm shall be applied to.
/// </param>
/// <param name="context">
/// The field resolver context.
/// </param>
/// <param name="defaultPageSize">
/// The default page size if no boundaries are set.
/// </param>
/// <param name="totalCount">
/// The total count if already known.
/// </param>
/// <param name="cancellationToken">
/// The cancellation token.
/// </param>
/// <typeparam name="TEntity">
/// The entity type.
/// </typeparam>
/// <returns>
/// Returns a connection instance that represents the result of applying the
/// cursor paging algorithm to the provided <paramref name="query"/>.
/// </returns>
public static ValueTask <Connection <TEntity> > ApplyCursorPaginationAsync <TEntity>(
this IQueryable <TEntity> query,
IResolverContext context,
int?defaultPageSize = null,
int?totalCount = null,
CancellationToken cancellationToken = default)
{
if (query is null)
{
throw new ArgumentNullException(nameof(query));
}
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
var first = context.ArgumentValue <int?>(CursorPagingArgumentNames.First);
var last = context.ArgumentValue <int?>(CursorPagingArgumentNames.Last);
if (totalCount is null && context.IsTotalCountSelected())
{
totalCount = query.Count();
}
if (first is null && last is null)
{
first = defaultPageSize;
}
var arguments = new CursorPagingArguments(
first,
last,
context.ArgumentValue <string?>(CursorPagingArgumentNames.After),
context.ArgumentValue <string?>(CursorPagingArgumentNames.Before));
return(QueryableCursorPagination <TEntity> .Instance.ApplyPaginationAsync(
query,
arguments,
totalCount,
cancellationToken));
}
