diff --git a/haas-java-client/src/main/java/cz/it4i/fiji/haas_java_client/HaaSClient.java b/haas-java-client/src/main/java/cz/it4i/fiji/haas_java_client/HaaSClient.java
index 5551cff0507f53ff4c0e31c516f40bf2f3391b86..ec345a94e900a6423a7169b8bb450c04a696a1e5 100644
--- a/haas-java-client/src/main/java/cz/it4i/fiji/haas_java_client/HaaSClient.java
+++ b/haas-java-client/src/main/java/cz/it4i/fiji/haas_java_client/HaaSClient.java
@@ -45,7 +45,13 @@ import cz.it4i.fiji.haas_java_client.proxy.UserAndLimitationManagementWsSoap;
 import cz.it4i.fiji.scpclient.ScpClient;
 
 public class HaaSClient {
-
+	interface UploadingFile {
+		InputStream getInputStream();
+		String getName();
+		long getLength();
+		long getLastTime();
+	}
+	
 	static public class SynchronizableFiles {
 
 		private Collection<TaskFileOffsetExt> files = new LinkedList<>();