internal NpletProducerNode(Context context, NpletQueryNode target, NpletFactory factory, IEnumerable<NpletTree> dependencies)
{
TargetQuery = target;
_factory = factory;
Dependencies = (from nplet in dependencies select context.CreateQueryNode(nplet)).ToArray();
_dependencyReaders = (from dependency in Dependencies select context.CreateReader(dependency)).ToArray();
}
/// <inheritdoc/>
internal override IEnumerable<NpletProducerNode> CreateProducers(NpletQueryNode query, Context context)
{
//creates query which will match to implication targeting the query
var implicationQuery = NpletTree.From(Edge.Then, Edge.TempVariable(), Edge.To(query.Query));
//fetches those implications from database
var implications = context.Fetch(implicationQuery);
var producers = new List<NpletProducerNode>();
foreach (var implication in implications)
{
var condition = implication.GetEdge(0).TargetAsNplet;
var producer = new NpletProducerNode(context, query, null, new[] { condition });
producers.Add(producer);
}
return producers;
}
/// <inheritdoc/>
internal override IEnumerable<NpletProducerNode> CreateProducers(NpletQueryNode query, Context context)
{
throw new NotImplementedException();
}
internal abstract IEnumerable<NpletProducerNode> CreateProducers(NpletQueryNode query, Context context);
internal QueryReader(NpletQueryNode source)
{
_source = source;
}
/// <summary>
/// Creates reader for given query.
/// </summary>
/// <param name="query">The query.</param>
/// <returns>The reader.</returns>
internal QueryReader CreateReader(NpletQueryNode query)
{
var reader = new QueryReader(query);
return reader;
}
private IEnumerable<NpletProducerNode> createProducers(NpletQueryNode query)
{
var result = new List<NpletProducerNode>();
foreach (var rule in _engine.Rules)
{
result.AddRange(rule.CreateProducers(query, this));
}
return result;
}