/// <summary>
/// Validates if a <see cref="PackageVersion"/> is available to load.
/// </summary>
/// <param name="versions">The instances of <see cref="PackageVersion"/> that needs to be validated.</param>
/// <exception cref="AggregateException">The <paramref name="versions"/> argument is null.</exception>
/// <inheritdoc />
public void ConfirmAvailability(IEnumerable <PackageVersion> versions)
{
EnsureArg.IsNotNull(versions, nameof(versions));
var nonExistingPackages = versions
.Where(_ =>
_.IsUnknown ||
!packService.IsPackageVersionDeployed(_))
.Stale();
if (nonExistingPackages.Any())
{
var errors = nonExistingPackages
.Select(_ => new PackageException(PackageException.NotFound, _));
throw new AggregateException(errors);
}
}
