Task/add virtuoso sink

cygnus-common/pom.xml

@@ -157,6 +157,11 @@
           <artifactId>jetty-util</artifactId>
           <version>6.1.25</version>
         </dependency>
+        <dependency>
+          <groupId>com.openlinksw</groupId>
+          <artifactId>virtjdbc4_3</artifactId>
+          <version>3.123</version>
+        </dependency>
     </dependencies>
 
     <build>

cygnus-common/src/main/java/com/telefonica/iot/cygnus/backends/sql/SQLBackendImpl.java

@@ -668,7 +668,6 @@ public void upsertTransaction (LinkedHashMap<String, ArrayList<JsonElement>> agg
         Connection connection = null;
         String upsertQuerys = new String();
         String currentUpsertQuery = new String();
-        int insertedRows[];
 
         try {
 

cygnus-common/src/main/java/com/telefonica/iot/cygnus/backends/sql/SQLQueryUtils.java

@@ -558,7 +558,7 @@ protected static int collectionSizeOnLinkedHashMap(LinkedHashMap<String, ArrayLi
      * @param attrNativeTypes the attr native types
      * @return the string value from json element
      */
-    protected static String getStringValueFromJsonElement(JsonElement value, String quotationMark, boolean attrNativeTypes) {
+    public static String getStringValueFromJsonElement(JsonElement value, String quotationMark, boolean attrNativeTypes) {
         String stringValue;
         if (attrNativeTypes) {
             if (value == null || value.isJsonNull()) {

cygnus-common/src/main/java/com/telefonica/iot/cygnus/backends/virtuoso/VirtuosoBackend.java

@@ -0,0 +1,29 @@
+/**
+ * Copyright 2025 Telefonica Espana
+ *
+ * This file is part of fiware-cygnus (FIWARE project).
+ *
+ * fiware-cygnus is free software: you can redistribute it and/or modify it under the terms of the GNU Affero
+ * General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ * fiware-cygnus is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License along with fiware-cygnus. If not, see
+ * http://www.gnu.org/licenses/.
+ *
+ * For those usages not covered by the GNU Affero General Public License please contact with iot_support at tid dot es
+ */
+
+package com.telefonica.iot.cygnus.backends.virtuoso;
+
+import com.telefonica.iot.cygnus.errors.CygnusBadContextData;
+import com.telefonica.iot.cygnus.errors.CygnusPersistenceError;
+import com.telefonica.iot.cygnus.errors.CygnusRuntimeError;
+
+public interface VirtuosoBackend {
+
+
+
+}