source: josm/src/org/openstreetmap/josm/actions/DownloadIncompleteAction.java@ 175

package org.openstreetmap.josm.actions;

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

import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.util.Collection;
import java.util.HashSet;

import javax.swing.JOptionPane;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.Way;
import org.openstreetmap.josm.data.osm.visitor.MergeVisitor;
import org.openstreetmap.josm.gui.PleaseWaitRunnable;
import org.openstreetmap.josm.io.IncompleteDownloader;
import org.xml.sax.SAXException;

/**
 * Action that opens a connection to the osm server and download map data.
 *
 * An dialog is displayed asking the user to specify a rectangle to grab.
 * The url and account settings from the preferences are used.
 *
 * @author imi
 */
public class DownloadIncompleteAction extends JosmAction {

        /**
         * Open the download dialog and download the data.
         * Run in the worker thread.
         */
        private final class DownloadTask extends PleaseWaitRunnable {
                private IncompleteDownloader reader;

                private DownloadTask(Collection<Way> toDownload) {
                        super(trn("Downloading {0} segment", "Downloading {0} segments", toDownload.size(), toDownload.size()));
                        reader = new IncompleteDownloader(toDownload);
                }

                @Override public void realRun() throws IOException, SAXException {
                        reader.parse();
                }

                @Override protected void finish() {
                        MergeVisitor merger = new MergeVisitor(Main.ds);
                        for (OsmPrimitive osm : reader.data.allPrimitives())
                                osm.visit(merger);
                        Main.parent.repaint();
                }

                @Override protected void cancel() {
                        reader.cancel();
                }
        }

        public DownloadIncompleteAction() {
                super(tr("Download incomplete objects"), "downloadincomplete", tr("Download all (selected) incomplete ways from the OSM server."), KeyEvent.VK_D, InputEvent.CTRL_DOWN_MASK | InputEvent.SHIFT_DOWN_MASK | InputEvent.ALT_DOWN_MASK);
        }

        public void actionPerformed(ActionEvent e) {
                Collection<Way> ways = new HashSet<Way>();
                for (Way w : Main.ds.ways)
                        if (w.isIncomplete() && w.selected)
                                ways.add(w);
                if (ways.isEmpty()) {
                        JOptionPane.showMessageDialog(Main.parent, tr("Please select an incomplete way."));
                        return;
                }
                if (JOptionPane.YES_OPTION != JOptionPane.showConfirmDialog(Main.parent, tr("Download {0} incomplete ways?", ways.size()), tr("Download?"), JOptionPane.YES_NO_OPTION))
                        return;
                PleaseWaitRunnable task = new DownloadTask(ways);
                Main.worker.execute(task);
        }
}