public static string ToEtag <T>(this IResultList <T> items, IEntityWithVersion app = null) where T : IEntity, IEntityWithVersion
{
using (Profiler.Trace("CalculateEtag"))
{
var unhashed = Unhashed(items, items.Total, app);
return(unhashed.Sha256Base64());
}
}
public static string ToEtag <T>(this T item, IEntityWithVersion app = null) where T : IEntity, IEntityWithVersion
{
var result = $"{item.Id};{item.Version}";
if (app != null)
{
result += ";";
result += app.Version;
}
return(result);
}
private static string Unhashed <T>(IReadOnlyList <T> items, long total, IEntityWithVersion app) where T : IEntity, IEntityWithVersion
{
var sb = new StringBuilder((items.Count * (GuidLength + 8)) + 10);
for (var i = 0; i < items.Count; i++)
{
sb.Append(";");
sb.Append(items[i].ToEtag());
}
sb.Append("_");
sb.Append(total);
if (app != null)
{
sb.Append("_");
sb.Append(app.Version);
}
return(sb.ToString());
}
private static bool IsFound(IEntityWithVersion entity)
{
return(entity.Version > EtagVersion.Empty);
}
