/// <summary>
/// Returns the CachedEntities metadata for the given entity.
/// </summary>
private UnorderedListMetadata GetMetadata(RuntimeEntity entity)
{
// get our unordered list metadata or create it
UnorderedListMetadata metadata;
if (entity.Metadata.UnorderedListMetadata.TryGetValue(_metadataKey, out metadata) == false)
{
metadata = new UnorderedListMetadata();
entity.Metadata.UnorderedListMetadata[_metadataKey] = metadata;
}
return(metadata);
}
/// <summary>
/// Updates the status of the entity inside of the cache; ie, if the entity is now
/// passing the filter but was not before, then it will be added to the cache.
/// </summary>
/// <returns>The change in cache status for the entity</returns>
public CacheChangeResult UpdateCache(RuntimeEntity entity)
{
UnorderedListMetadata metadata = GetMetadata(entity);
bool passed = _filter.Check(entity);
bool contains = CachedEntities.Contains(entity, metadata);
// The entity is not in the cache it now passes the filter, so add it to the cache
if (contains == false && passed)
{
CachedEntities.Add(entity, metadata);
return(CacheChangeResult.Added);
}
// The entity is in the cache but it no longer passes the filter, so remove it
if (contains && passed == false)
{
CachedEntities.Remove(entity, metadata);
return(CacheChangeResult.Removed);
}
// no change to the cache
return(CacheChangeResult.NoChange);
}
/// <summary>
/// Returns the CachedEntities metadata for the given entity.
/// </summary>
private UnorderedListMetadata GetMetadata(RuntimeEntity entity) {
// get our unordered list metadata or create it
UnorderedListMetadata metadata;
if (entity.Metadata.UnorderedListMetadata.TryGetValue(_metadataKey, out metadata) == false) {
metadata = new UnorderedListMetadata();
entity.Metadata.UnorderedListMetadata[_metadataKey] = metadata;
}
return metadata;
}
