Index: trunk/src/org/openstreetmap/josm/data/DataSetChecker.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/DataSetChecker.java	(revision 2286)
+++ 	(revision )
@@ -1,57 +1,0 @@
-// License: GPL. Copyright 2007 by Immanuel Scholz and others
-package org.openstreetmap.josm.data;
-
-import java.util.HashSet;
-import java.util.Set;
-
-import javax.swing.JOptionPane;
-
-import org.openstreetmap.josm.Main;
-import org.openstreetmap.josm.data.osm.OsmPrimitive;
-import org.openstreetmap.josm.gui.layer.Layer;
-import org.openstreetmap.josm.gui.layer.OsmDataLayer;
-
-// FIXME: class still needed?
-
-public class DataSetChecker {
-
-    public static void check() {
-        if (Main.map == null)
-            return;
-
-        Set<OsmPrimitive> s = new HashSet<OsmPrimitive>();
-        for (Layer l : Main.map.mapView.getAllLayers()) {
-            if (l instanceof OsmDataLayer) {
-                for (OsmPrimitive osm : ((OsmDataLayer)l).data.allPrimitives()) {
-                    if (s.contains(osm)) {
-                        // FIXME: better message
-                        // FIXME: translate message and title
-                        JOptionPane.showMessageDialog(
-                                Main.parent,
-                                "cross references",
-                                "Information",
-                                JOptionPane.INFORMATION_MESSAGE);
-                        return;
-                    }
-                    s.add(osm);
-                }
-            }
-        }
-
-        if (Main.map.mapView.getActiveLayer() instanceof OsmDataLayer) {
-            OsmDataLayer l = (OsmDataLayer)Main.map.mapView.getActiveLayer();
-            if (l.data != Main.main.getCurrentDataSet()) {
-                JOptionPane.showMessageDialog(
-                        Main.parent,
-                        "Main.ds / active layer mismatch",
-                        "Error",
-                        JOptionPane.ERROR_MESSAGE
-                );
-                return;
-            }
-        }
-
-        JOptionPane.showMessageDialog(
-                Main.parent, "working", "", JOptionPane.INFORMATION_MESSAGE);
-    }
-}