source: josm/src/org/openstreetmap/josm/command/DeleteCommand.java@ 104

package org.openstreetmap.josm.command;

import static org.openstreetmap.josm.tools.I18n.tr;
import static org.openstreetmap.josm.tools.I18n.trn;

import java.util.Collection;

import javax.swing.JLabel;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.MutableTreeNode;

import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.visitor.NameVisitor;
import org.openstreetmap.josm.tools.ImageProvider;

/**
 * A command to delete a number of primitives from the dataset.
 * @author imi
 */
public class DeleteCommand extends Command {

        /**
         * The primitive that get deleted.
         */
        private final Collection<OsmPrimitive> data;

        public DeleteCommand(Collection<OsmPrimitive> data) {
                this.data = data;
        }

        @Override public void executeCommand() {
                super.executeCommand();
                for (OsmPrimitive osm : data)
                        osm.delete(true);
        }

        @Override public void fillModifiedData(Collection<OsmPrimitive> modified, Collection<OsmPrimitive> deleted, Collection<OsmPrimitive> added) {
                deleted.addAll(data);
        }

        @Override public MutableTreeNode description() {
                NameVisitor v = new NameVisitor();

                if (data.size() == 1) {
                        data.iterator().next().visit(v);
                        return new DefaultMutableTreeNode(new JLabel(tr("Delete"+" "+v.className+" "+v.name), v.icon, JLabel.HORIZONTAL));
                }

                String cname = null;
                for (OsmPrimitive osm : data) {
                        osm.visit(v);
                        if (cname == null)
                                cname = v.className;
                        else if (!cname.equals(v.className))
                                cname = "primitive";
                }
                DefaultMutableTreeNode root = new DefaultMutableTreeNode(new JLabel(
                                tr("Delete")+" "+data.size()+" "+trn(cname, cname+"s", data.size()), ImageProvider.get("data", cname), JLabel.HORIZONTAL));
                for (OsmPrimitive osm : data) {
                        osm.visit(v);
                        root.add(new DefaultMutableTreeNode(v.toLabel()));
                }
                return root;
        }
}