source: josm/trunk/src/org/openstreetmap/josm/command/AddCommand.java@ 1722

// 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.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.
 *
 * See {@link ChangeCommand 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 boolean executeCommand() {
        osm.visit(new AddVisitor(ds));
        return true;
    }

    @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));
    }
}