public T GetExtension <T> () where T : ChainedExtension, new()
{
if (!chains.TryGetValue(typeof(T), out ChainedExtensionSentinel e))
{
e = new ChainedExtensionSentinel(new T());
e.Update(this, typeof(T), -1);
chains [typeof(T)] = e;
}
return((T)e.Extension);
}
void Rechain(int firstChangeIndex)
{
// If we are in a batch update, only update where to start rechaining.
if (batchModifier != null)
{
batchModifier.UpdateFirstIndex(firstChangeIndex);
return;
}
// Re-chain every extension
for (int n = extensions.Length - 2; n >= 0; n--)
{
extensions [n].InitChain(this, extensions [n + 1]);
}
// The first extension object in type-specific chains is a placeholder extension used only to hold
// a reference to the real first extension.
foreach (var kvp in chains)
{
ChainedExtensionSentinel fex = kvp.Value;
fex.Update(this, kvp.Key, firstChangeIndex);
}
}
