--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/FixingsOverview.java	Wed May 23 13:48:20 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/FixingsOverview.java	Wed May 23 18:27:45 2012 +0000
@@ -748,13 +748,24 @@
     public static abstract class ComponentFilter implements Fixing.Filter {
         protected List<Fixing.Filter> children;
 
+        public ComponentFilter() {
+            children = new ArrayList<Fixing.Filter>();
+        }
+
         public ComponentFilter(List<Fixing.Filter> children) {
             this.children = children;
         }
+
+        public void add(Fixing.Filter filter) {
+            children.add(filter);
+        }
     } // class ComponentFilter
 
     public static class OrFilter extends ComponentFilter {
 
+        public OrFilter() {
+        }
+
         public OrFilter(List<Fixing.Filter> children) {
             super(children);
         }
@@ -772,6 +783,9 @@
 
     public static class AndFilter extends ComponentFilter {
 
+        public AndFilter() {
+        }
+
         public AndFilter(List<Fixing.Filter> children) {
             super(children);
         }