public IReleaseJson CheckForUpdate(string aCurrentVersion, EReleaseQuality aCurrentQuality, string aCurrentPlatform, string aCurrentPlatformVersion, EReleaseQuality aDesiredQuality)
{
// select all releases that
// - are for this platform
// - have a min platform version that is less than or equal to this platform version
// - have a quality that matches the desired quality
var releases = Json.Releases.Where(r => r.Platform == aCurrentPlatform)
.Where(r => VersionSupport.ComparePartialVersions(aCurrentPlatformVersion, r.PlatformMinVersion) >= 0)
.Where(r => (r.Quality() & aDesiredQuality) == r.Quality());
// select the release with the highest version for each release quality
// - group by quality
// - order releases in each group by ascending version
// - select the last release in each group
releases = releases.GroupBy(r => r.Quality())
.Select(g => g.OrderBy(r => r.Version, new VersionComparer()).Last());
// pick the release with the highest version number and the highest quality (priority to version number)
var release = releases.OrderBy(r => r.Version, new VersionComparer())
.ThenBy(r => r.Quality())
.LastOrDefault();
if (release == null)
{
return(null);
}
// this version is a valid update if
// - its version is greater than the current app version
// - its version is the same as the current app version but its quality is greater than the current app quality
// - its version is less than the current app version and the current app quality is not in the desired quality
if (VersionSupport.ComparePartialVersions(release.Version, aCurrentVersion) > 0 ||
(VersionSupport.ComparePartialVersions(release.Version, aCurrentVersion) == 0 && release.Quality() > aCurrentQuality) ||
(VersionSupport.ComparePartialVersions(release.Version, aCurrentVersion) < 0 && (aCurrentQuality & aDesiredQuality) != aCurrentQuality))
{
return(release);
}
return(null);
}
public int Compare(string aVersionA, string aVersionB)
{
return VersionSupport.ComparePartialVersions(aVersionA, aVersionB);
}