--- a/src/main/java/de/intevation/lada/rest/stamm/MessgroesseService.java	Wed Jul 08 09:41:47 2015 +0200
+++ b/src/main/java/de/intevation/lada/rest/stamm/MessgroesseService.java	Wed Jul 08 09:42:22 2015 +0200
@@ -7,8 +7,12 @@
  */
 package de.intevation.lada.rest.stamm;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import javax.enterprise.context.RequestScoped;
 import javax.inject.Inject;
+import javax.persistence.Query;
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
@@ -16,10 +20,15 @@
 import javax.ws.rs.core.Context;
 import javax.ws.rs.core.HttpHeaders;
 import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.MultivaluedMap;
 import javax.ws.rs.core.UriInfo;
 
+import org.apache.log4j.Logger;
+
 import de.intevation.lada.model.stamm.Messgroesse;
+import de.intevation.lada.model.stamm.MmtMessgroesse;
 import de.intevation.lada.util.annotation.RepositoryConfig;
+import de.intevation.lada.util.data.QueryBuilder;
 import de.intevation.lada.util.data.Repository;
 import de.intevation.lada.util.data.RepositoryType;
 import de.intevation.lada.util.rest.Response;
@@ -58,6 +67,9 @@
 @RequestScoped
 public class MessgroesseService {
 
+    @Inject
+    private Logger logger = Logger.getLogger(MessgroesseService.class);
+
     /**
      * The data repository granting read access.
      */
@@ -79,7 +91,27 @@
         @Context HttpHeaders headers,
         @Context UriInfo info
     ) {
-        return defaultRepo.getAll(Messgroesse.class, "stamm");
+        MultivaluedMap<String, String> params = info.getQueryParameters();
+        if (params.isEmpty() || !params.containsKey("mmtId")) {
+            logger.debug("no filter");
+            return defaultRepo.getAll(Messgroesse.class, "stamm");
+        }
+        String mmtId = params.getFirst("mmtId");
+        if (mmtId.length() > 3) {
+            return new Response(false, 400, "bad request");
+        }
+
+        Query query =
+            defaultRepo.queryFromString(
+                "select messgroesse_id from mmt_messgroesse where mmt_id = '"
+                + mmtId + "'", "stamm");
+        List<Integer> ids = query.getResultList();
+        QueryBuilder<Messgroesse> builder2 =
+            new QueryBuilder<Messgroesse>(
+                defaultRepo.entityManager("stamm"),
+                Messgroesse.class);
+        builder2.orIntList("id", ids);
+        return defaultRepo.filter(builder2.getQuery(), "stamm");
     }
 
     /**