private string GetExceptionMessage(LogicalDictionaryEvent e, K key,
V newVal, V oldVal)
{
var msg = GetExceptionMessage_Internal(e, key, newVal, oldVal);
if (msg != null)
{
return(msg);
}
if (e == LogicalDictionaryEvent.Add)
{
return($"Cannot add {newVal} for key `{key}`");
}
else if (e == LogicalDictionaryEvent.Change)
{
return($"Cannot change key `{key}` from {oldVal} to {newVal}");
}
else if (e == LogicalDictionaryEvent.Remove)
{
return($"Cannot remove key `{key}`");
}
return($"Unknown event {e}");
}
public void Validate(LogicalDictionaryEvent e, K key, V newVal = default(V), V oldVal = default(V))
{
Func <K, V, V, bool> validator = (k, n, o) => false;
switch (e)
{
case LogicalDictionaryEvent.Add:
validator = (k, n, o) => CanAddKey(k, n);
break;
case LogicalDictionaryEvent.Change:
validator = CanChangeKey;
break;
case LogicalDictionaryEvent.Remove:
validator = (k, n, o) => CanRemoveKey(k);
break;
default:
break;
}
if (!validator(key, newVal, oldVal))
{
throw new InvalidOperationException(GetExceptionMessage(e, key, newVal, oldVal));
}
}
protected override string GetExceptionMessage_Internal(LogicalDictionaryEvent e, string key, Type newVal, Type oldVal)
{
if (e == LogicalDictionaryEvent.Remove)
{
return("Removals not allowed for this dictionary!");
}
return($"Cannot change value for {key} storage engine once set!");
}
protected virtual string GetExceptionMessage_Internal(LogicalDictionaryEvent e, K key,
V newVal, V oldVal)
{
return(null);
}
