/// <summary>
/// Match
///
/// Allows us to fetch entities with a defined SET of components
/// </summary>
/// <param name="query"></param>
/// <returns></returns>
public bool Match(IEntityQuery query)
{
// Empty queries always result in a match - equivalent to SELECT * FROM ENTITIES
if (!(query.Exclusionset.Any() || query.OneSet.Any() || query.AllSet.Any()))
{
return(true);
}
//If there is an EXCLUDE set, and the entity contains any component types in that set, or subtypes of them, the entity is excluded.
bool matched = !(query.Exclusionset.Any() && query.Exclusionset.Any(t => ComponentTypes.Any(t.IsAssignableFrom)));
//If there are no matching exclusions, and the entity matches the ALL set, the entity is included
if (matched && (query.AllSet.Any() && query.AllSet.Any(t => !ComponentTypes.Any(t.IsAssignableFrom))))
{
matched = false;
}
//If the entity matches so far, and it matches the ONE set, it matches.
if (matched && (query.OneSet.Any() && query.OneSet.Any(t => ComponentTypes.Any(t.IsAssignableFrom))))
{
matched = false;
}
return(matched);
}
internal bool IsAppliableComponent(BaseComponent component)
{
return(ComponentTypes.Any(e => e == component.GetType() || component.GetType().IsAssignableFrom(e)));
}