source: josm/trunk/src/org/openstreetmap/josm/data/DataSetChecker.java@ 1180

// 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;

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)) {
                        JOptionPane.showMessageDialog(Main.parent, "cross references");
                        return;
                    }
                    s.add(osm);
                }
            }
        }

        if (Main.map.mapView.getActiveLayer() instanceof OsmDataLayer) {
            OsmDataLayer l = (OsmDataLayer)Main.map.mapView.getActiveLayer();
            if (l.data != Main.ds) {
                JOptionPane.showMessageDialog(Main.parent, "Main.ds / active layer mismatch");
                return;
            }
        }

        JOptionPane.showMessageDialog(Main.parent, "working");
    }
}