/// <inheritdoc />
public QuerySingleResult QueryObject(QueryExpression expression)
{
string?id;
if (expression.IsListQueryExpression)
{
id = IdParameterAsString(expression.AsListQueryExpression().Parameters.First());
}
else if (expression.IsMapQueryExpression)
{
id = IdParameterAsString(expression.AsMapQueryExpression().Parameters["id"]);
}
else
{
throw new StorageException(Result.Error, $"Unknown query type: {expression}");
}
var store = _stores.ComputeIfAbsent(expression.Type, type => new Dictionary <long, TState>());
var found = id == null || id.Equals("-1") ? null ! : store[long.Parse(id)];
var result = Optional
.OfNullable(found)
.Map(state => _stateAdapterProvider.FromRaw <StateObject, TState>(state))
.OrElse(null !);
return(new QuerySingleResult(result));
}