--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/fixings/RankRemapper.java	Wed Aug 21 15:41:58 2013 +0200
@@ -0,0 +1,44 @@
+/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
+ * Software engineering by Intevation GmbH
+ *
+ * This file is Free Software under the GNU AGPL (>=v3)
+ * and comes with ABSOLUTELY NO WARRANTY! Check out the
+ * documentation coming with Dive4Elements River for details.
+ */
+
+package org.dive4elements.river.artifacts.model.fixings;
+
+import java.util.IdentityHashMap;
+
+import org.apache.log4j.Logger;
+
+import gnu.trove.TIntIntHashMap;
+
+public class RankRemapper {
+
+    private static Logger log = Logger.getLogger(RankRemapper.class);
+
+    private TIntIntHashMap                index2rank;
+    private IdentityHashMap<QWI, Boolean> visited;
+
+    public RankRemapper() {
+        index2rank = new TIntIntHashMap();
+        visited    = new IdentityHashMap<QWI, Boolean>();
+    }
+
+    public void toMap(int index) {
+        index2rank.put(index, index2rank.size());
+    }
+
+    public <I extends QWI> void remap(I qwi) {
+        if (!visited.containsKey(qwi)) {
+            int idx = qwi.index;
+            if (index2rank.containsKey(idx)) {
+                qwi.index = index2rank.get(idx);
+            } else if (log.isDebugEnabled()) {
+                log.debug("Cannot remap " + idx);
+            }
+            visited.put(qwi, true);
+        }
+    }
+}