private TopicExpression GetTopicExpression(FilterTopic filterTopic)
{
if (filterTopic == null)
{
return(new AnyTopic());
}
return(new OrExpression(new[]
{
GetTopicExpression(filterTopic.First),
GetTopicExpression(filterTopic.Second)
}));
}
private TopicExpression GetTopicExpression(FilterTopic filterTopic)
{
if (filterTopic == null)
{
return(AnyTopic.Instance);
}
else if (filterTopic.Topic != null)
{
return(new SpecificTopic(filterTopic.Topic));
}
else if (filterTopic.Topics.Any())
{
return(new OrExpression(filterTopic.Topics.Select(t => new SpecificTopic(t)).ToArray <TopicExpression>()));
}
else
{
return(AnyTopic.Instance);
}
}
