private static IValue GetStructureVersionHolder(this IVault vault)
{
// Load all possible version holders
var versionHolder1 = vault.GetValue("$version");
var versionHolder2 = vault.GetValue("$format");
var versionHolder3 = vault.GetValue("$structureversion");
// Get version token from the latest holder
var genuineHolder = versionHolder3 ?? versionHolder2 ?? versionHolder1;
genuineHolder = genuineHolder ?? vault.CreateValue("$structureversion");
var genuineVersion = genuineHolder.ContentString;
// Ensure that all kinds of version holders are present in the vault (backward compat!)
versionHolder1 = versionHolder1 ?? vault.GetOrCreateValue("$version");
versionHolder2 = versionHolder2 ?? vault.GetOrCreateValue("$format");
versionHolder3 = versionHolder3 ?? vault.GetOrCreateValue("$structureversion");
var allHolders = new [] { versionHolder1, versionHolder2, versionHolder3 };
// Now synchronize all version signatures across all holders
foreach (var anyVersionHolder in allHolders)
{
if (anyVersionHolder != null)
{
anyVersionHolder.SetContent(genuineVersion);
}
}
// Return only the latest holder
return(genuineHolder);
}
