public List <Entity> Query(IQuerySystem querySystem)
{
// If query is already cached, just return it.
if (_poolQueryResults.ContainsKey(querySystem))
{
return(_poolQueryResults[querySystem]);
}
// If query hasn't been cached, add it.
return(AddQuery(querySystem));
}
public List <Entity> AddQuery(IQuerySystem querySystem)
{
var queryResult = new List <Entity>();
// Add all entities which meet the requirements of the query.
foreach (Entity e in _pool)
{
if (querySystem.Query(e))
{
queryResult.Add(e);
}
}
// Store the query result for quick future access.
_poolQueryResults[querySystem] = queryResult;
return(queryResult);
}
public void RemoveQuery(IQuerySystem querySystem)
{
_poolQueryResults.Remove(querySystem);
}