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.util.Collection;
010import java.util.List;
011
012import org.openstreetmap.josm.data.osm.OsmPrimitive;
013import org.openstreetmap.josm.data.osm.visitor.MergeSourceBuildingVisitor;
014import org.openstreetmap.josm.gui.dialogs.LayerListDialog;
015import org.openstreetmap.josm.gui.layer.Layer;
016import org.openstreetmap.josm.gui.layer.OsmDataLayer;
017import org.openstreetmap.josm.gui.util.GuiHelper;
018import org.openstreetmap.josm.tools.ImageProvider;
019import org.openstreetmap.josm.tools.Shortcut;
020
021/**
022 * Merge the currently selected objects into another layer.
023 * @since 1890
024 */
025public class MergeSelectionAction extends AbstractMergeAction {
026
027    /**
028     * Constructs a new {@code MergeSelectionAction}.
029     */
030    public MergeSelectionAction() {
031        super(tr("Merge selection"), "dialogs/mergedown", tr("Merge the currently selected objects into another layer"),
032            Shortcut.registerShortcut("system:mergeselection", tr("Edit: {0}", tr("Merge selection")),
033            KeyEvent.VK_M, Shortcut.CTRL_SHIFT),
034            true /* register */
035        );
036        putValue("help", ht("/Action/MergeSelection"));
037    }
038
039    /**
040     * Merge the currently selected objects into another layer.
041     */
042    public void mergeSelected() {
043        OsmDataLayer editLayer = getLayerManager().getEditLayer();
044        List<Layer> targetLayers = LayerListDialog.getInstance().getModel().getPossibleMergeTargets(editLayer);
045        if (targetLayers.isEmpty()) {
046            warnNoTargetLayersForSourceLayer(editLayer);
047            return;
048        }
049        Layer targetLayer = askTargetLayer(targetLayers);
050        if (targetLayer == null)
051            return;
052        if (editLayer.isUploadDiscouraged() && targetLayer instanceof OsmDataLayer
053                && !((OsmDataLayer) targetLayer).isUploadDiscouraged()
054                && editLayer.data.getAllSelected().size() > 1
055                && warnMergingUploadDiscouragedObjects(targetLayer)) {
056            return;
057        }
058        MergeSourceBuildingVisitor builder = new MergeSourceBuildingVisitor(editLayer.data);
059        ((OsmDataLayer) targetLayer).mergeFrom(builder.build());
060    }
061
062    @Override
063    public void actionPerformed(ActionEvent e) {
064        OsmDataLayer editLayer = getLayerManager().getEditLayer();
065        if (editLayer == null || editLayer.data.selectionEmpty())
066            return;
067        mergeSelected();
068    }
069
070    @Override
071    protected void updateEnabledState() {
072        updateEnabledStateOnCurrentSelection();
073    }
074
075    @Override
076    protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
077        setEnabled(selection != null && !selection.isEmpty());
078    }
079
080    /**
081     * Warns the user about merging too many objects with different upload policies.
082     * @param targetLayer Target layer
083     * @return true if the user wants to cancel, false if they want to continue
084     */
085    public final boolean warnMergingUploadDiscouragedObjects(Layer targetLayer) {
086        return GuiHelper.warnUser(tr("Merging too many objects with different upload policies"),
087                "<html>" +
088                tr("You are about to merge more than 1 object between layers ''{0}'' and ''{1}''.<br /><br />"+
089                        "<b>This is not the recommended way of merging such data</b>.<br />"+
090                        "You should instead check and merge each object, <b>one by one</b>.<br /><br />"+
091                        "Are you sure you want to continue?",
092                        getLayerManager().getEditLayer().getName(), targetLayer.getName(), targetLayer.getName())+
093                "</html>",
094                ImageProvider.get("dialogs", "mergedown"), tr("Ignore this hint and merge anyway"));
095    }
096}