001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.actions;
003
004import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
005import static org.openstreetmap.josm.tools.I18n.tr;
006
007import java.awt.event.ActionEvent;
008import java.awt.event.KeyEvent;
009import java.awt.geom.Area;
010import java.util.ArrayList;
011import java.util.List;
012import java.util.concurrent.Future;
013
014import org.openstreetmap.josm.actions.downloadtasks.DownloadTaskList;
015import org.openstreetmap.josm.data.DataSource;
016import org.openstreetmap.josm.gui.layer.OsmDataLayer;
017import org.openstreetmap.josm.gui.progress.swing.PleaseWaitProgressMonitor;
018import org.openstreetmap.josm.io.NetworkManager;
019import org.openstreetmap.josm.io.OnlineResource;
020import org.openstreetmap.josm.tools.Shortcut;
021
022/**
023 * This action synchronizes the dataset with the current state on the server.
024 *
025 * It does so by re-downloading all areas and thereby merging all compatible
026 * changes from the current server version.
027 */
028public class UpdateDataAction extends JosmAction {
029
030    /**
031     * Constructs a new {@code UpdateDataAction}.
032     */
033    public UpdateDataAction() {
034        super(tr("Update data"),
035                "updatedata",
036                tr("Updates the objects in the active data layer from the server."),
037                Shortcut.registerShortcut("file:updatedata",
038                        tr("File: {0}", tr("Update data")),
039                        KeyEvent.VK_U, Shortcut.CTRL),
040                true);
041        setHelpId(ht("/Action/UpdateData"));
042    }
043
044    /**
045     * Refreshes the enabled state
046     */
047    @Override
048    protected void updateEnabledState() {
049        OsmDataLayer editLayer = getLayerManager().getEditLayer();
050        setEnabled(editLayer != null && editLayer.isDownloadable() && !NetworkManager.isOffline(OnlineResource.OSM_API));
051    }
052
053    @Override
054    public void actionPerformed(ActionEvent e) {
055        OsmDataLayer editLayer = getLayerManager().getEditLayer();
056        if (!isEnabled() || editLayer == null || !editLayer.isDownloadable())
057            return;
058
059        List<Area> areas = new ArrayList<>();
060        for (DataSource ds : editLayer.data.getDataSources()) {
061            areas.add(new Area(ds.bounds.asRect()));
062        }
063
064        // The next two blocks removes every intersection from every DataSource Area
065        // This prevents downloading the same data numerous times at intersections
066        // and also skips smaller bounding boxes that are contained within larger ones entirely.
067        for (int i = 0; i < areas.size(); i++) {
068            for (int j = i+1; j < areas.size(); j++) {
069                areas.get(i).subtract(areas.get(j));
070            }
071        }
072
073        for (int i = areas.size()-1; i > 0; i--) {
074            for (int j = i-1; j > 0; j--) {
075                areas.get(i).subtract(areas.get(j));
076            }
077        }
078
079        List<Area> areasToDownload = new ArrayList<>();
080        for (Area a : areas) {
081            if (a.isEmpty()) {
082                continue;
083            }
084            areasToDownload.add(a);
085        }
086
087        if (areasToDownload.isEmpty()) {
088            // no bounds defined in the dataset? we update all primitives in the data set using a series of multi fetch requests
089            UpdateSelectionAction.updatePrimitives(editLayer.data.allPrimitives());
090        } else {
091            // bounds defined? => use the bbox downloader
092            final PleaseWaitProgressMonitor monitor = new PleaseWaitProgressMonitor(tr("Download data"));
093            final Future<?> future = new DownloadTaskList().download(false /* no new layer */, areasToDownload, true, false, monitor);
094            waitFuture(future, monitor);
095        }
096    }
097}