Example #1
0
        /// <summary>
        /// Find items based on a template pattern
        /// </summary>
        /// <param name="query"></param>
        /// <param name="stopAfterFirst"></param>
        /// <returns>Returns matching items if found. Returns empty (non-null) array if none found.</returns>
        public JToken FindItems(JObject query, bool stopAfterFirst = true)
        {
            var results = new JArray();

            foreach (var source in this.Items)
            {
                if (source.Value == null)
                {
                    continue;
                }

                foreach (var candidateItem in source.Value)
                {
                    var joItem = (JObject)candidateItem.DeepClone();

                    var u = Unification.Unify(joItem, query);
                    if (u == null)
                    {
                        continue;
                    }

                    joItem.Add("#unification", u);
                    results.Add(joItem);

                    if (stopAfterFirst)
                    {
                        return(results[0]);
                    }
                }
            }

            return(results);
        }
Example #2
0
        public JToken Query(JToken query)
        {
            if (query.Type == JTokenType.Object)
            {
                var joQuery = (JObject)query;
                var select  = joQuery["#select"];
                if (select == null)
                {
                    return(query);
                }
                else
                {
                    joQuery.Remove("#select");
                }

                var result = new JArray();

                // {"#item": "?x", "select": "username"}
                foreach (var querySource in this.Items)
                {
                    if (querySource.Value.Type == JTokenType.Object)
                    {
                        var joQuerySource = (JObject)querySource.Value;
                        var items         = joQuerySource["items"];
                        if (items == null)
                        {
                            continue;
                        }
                        var jaItems = (JArray)items;

                        foreach (var item in jaItems)
                        {
                            var joItem = (JObject)item.DeepClone();

                            var unification = Unification.Unify(joItem, joQuery);
                            if (unification == null)
                            {
                                continue;
                            }

                            if (select == null)
                            {
                                joItem.Add("#unification", unification);
                                result.Add(joItem);
                            }
                            else
                            {
                                var sSelect = select.ToString();

                                if (sSelect == "*")
                                {
                                    result.Add(joItem);
                                }
                                else
                                {
                                    var value = joItem[select.ToString()];
                                    result.Add(value);
                                }
                            }
                        }
                    }
                }

                if (result.Count == 1)
                {
                    return(result.First);
                }
                else
                {
                    return(result);
                }
            }
            else if (query.Type == JTokenType.Array)
            {
                return(query);
            }
            else if (query.Type == JTokenType.String)
            {
                return(query);
            }

            return(null);
        }