source: josm/branch/0.5/src/org/openstreetmap/josm/command/AddCommand.java@ 341

// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.command;

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

import java.util.Collection;

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

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.osm.DataSet;
import org.openstreetmap.josm.data.osm.Relation;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.visitor.AddVisitor;
import org.openstreetmap.josm.data.osm.visitor.DeleteVisitor;
import org.openstreetmap.josm.data.osm.visitor.NameVisitor;
import org.openstreetmap.josm.gui.layer.Layer;
import org.openstreetmap.josm.gui.layer.OsmDataLayer;

/**
 * A command that adds an osm primitive to a dataset. Keys cannot be added this
 * way. Use ChangeKeyValueCommand instead.
 * 
 * See ChangeCommand for comments on relation back references.
 * 
 * @author imi
 */
public class AddCommand extends Command {

        /**
         * The primitive to add to the dataset.
         */
        private final OsmPrimitive osm;
        
        private DataSet ds;

        /**
         * Create the command and specify the element to add.
         */
        public AddCommand(OsmPrimitive osm) {
                this.osm = osm;
                this.ds = Main.main.editLayer().data;
        }

        @Override public void executeCommand() {
                osm.visit(new AddVisitor(ds));
        }

        @Override public void undoCommand() {
                osm.visit(new DeleteVisitor(ds));
        }

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

        // faster implementation
        @Override public boolean invalidBecauselayerRemoved(Layer oldLayer) {
            return oldLayer instanceof OsmDataLayer && ((OsmDataLayer)oldLayer).data == ds;
    }

        @Override public MutableTreeNode description() {
                NameVisitor v = new NameVisitor();
                osm.visit(v);
                return new DefaultMutableTreeNode(new JLabel(tr("Add")+" "+tr(v.className)+" "+v.name, v.icon, JLabel.HORIZONTAL));
    }
}