Dev

src/AimsBackend/Controllers/MetadataController.cs

@@ -43,8 +43,59 @@ namespace AimsBackend.Controllers
         /// <param name="targetClass"></param>
         /// <returns></returns>
         [HttpGet(Name = "GetMetadata")]
-        public IEnumerable<string> Get(string? subject, string? predicate, string? query, Uri? targetClass)
+        public IEnumerable<string> Get(
+            string? subject,
+            string? predicate,
+            string? query,
+            Uri? targetClass)
         {
+            return MetadataQuery(subject, predicate, query, null, targetClass);
+        }
+
+        /// <summary>
+        /// Gets metadata by a query and targetClass parameter and returns a list of text/turtle formatted metadata
+        /// </summary>
+        /// <param name="subject"></param>
+        /// <param name="predicate"></param>
+        /// <param name="query"></param>
+        /// <param name="values"></param>
+        /// <param name="targetClass"></param>
+        /// <returns></returns>
+        [HttpPost("/query", Name = "PostQueryMetadata")]
+        public IEnumerable<string> Post(
+            string? subject,
+            string? predicate,
+            string? query,
+            List<PredicateObject>? values,
+            Uri? targetClass)
+        {
+            return MetadataQuery(subject, predicate, query, values, targetClass);
+        }
+
+        private IEnumerable<string> MetadataQuery(string? subject, string? predicate, string? query, List<PredicateObject>? values, Uri? targetClass)
+        {
+            var valueFilter = "";
+            var queryStringFilters = new List<Action<SparqlParameterizedString>>();
+            if (values is not null)
+            {
+                var count = 1;
+                foreach (var value in values)
+                {
+                    valueFilter +=
+                        @$"FILTER(REGEX(str(?p), @pred{count})) .
+                    FILTER(REGEX(str(?o), @obj{count})) .
+                    ";
+
+                    var localCount = count;
+                    var localPred = value.Predicate;
+                    var localObj = value.Object;
+
+                    queryStringFilters.Add((query) => query.SetLiteral($"pred{localCount}", localPred));
+                    queryStringFilters.Add((query) => query.SetLiteral($"obj{localCount}", localObj));
+                    count++;
+                }
+            }
+
             var queryString = new SparqlParameterizedString
             {
                 CommandText = @"SELECT DISTINCT ?g WHERE { 
@@ -54,6 +105,7 @@ namespace AimsBackend.Controllers
                     " + (subject != null ? "FILTER(REGEX(str(?s), @subject)) ." : "") + @"
                     " + (predicate != null ? "FILTER(REGEX(str(?p), @predicate)) ." : "") + @"
                     " + (query != null ? "FILTER(REGEX(str(?o), @query)) ." : "") + @"
+                    " + valueFilter + @"
                   } .
                   FILTER(REGEX(str(?g), @graphPrefix)) .
                 }"
@@ -74,6 +126,10 @@ namespace AimsBackend.Controllers
             {
                 queryString.SetLiteral("query", query);
             }
+            foreach (var queryStringFilter in queryStringFilters)
+            {
+                queryStringFilter(queryString);
+            }
             queryString.SetLiteral("graphPrefix", _graphPrefix);
             var resultSet = QueryEndpoint.QueryWithResultSet(queryString.ToString());