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        List<Layer> targetLayers = LayerListDialog.getInstance().getModel().getPossibleMergeTargets(getEditLayer());
044        if (targetLayers.isEmpty()) {
045            warnNoTargetLayersForSourceLayer(getEditLayer());
046            return;
047        }
048        Layer targetLayer = askTargetLayer(targetLayers);
049        if (targetLayer == null)
050            return;
051        if (getEditLayer().isUploadDiscouraged() && targetLayer instanceof OsmDataLayer
052                && !((OsmDataLayer) targetLayer).isUploadDiscouraged()
053                && getEditLayer().data.getAllSelected().size() > 1
054                && warnMergingUploadDiscouragedObjects(targetLayer)) {
055            return;
056        }
057        MergeSourceBuildingVisitor builder = new MergeSourceBuildingVisitor(getEditLayer().data);
058        ((OsmDataLayer) targetLayer).mergeFrom(builder.build());
059    }
060
061    @Override
062    public void actionPerformed(ActionEvent e) {
063        if (getEditLayer() == null || getEditLayer().data.getAllSelected().isEmpty())
064            return;
065        mergeSelected();
066    }
067
068    @Override
069    protected void updateEnabledState() {
070        if (getCurrentDataSet() == null) {
071            setEnabled(false);
072        } else {
073            updateEnabledState(getCurrentDataSet().getAllSelected());
074        }
075    }
076
077    @Override
078    protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
079        setEnabled(selection != null && !selection.isEmpty());
080    }
081
082    /**
083     * Warns the user about merging too many objects with different upload policies.
084     * @param targetLayer Target layer
085     * @return true if the user wants to cancel, false if they want to continue
086     */
087    public static final boolean warnMergingUploadDiscouragedObjects(Layer targetLayer) {
088        return GuiHelper.warnUser(tr("Merging too many objects with different upload policies"),
089                "<html>" +
090                tr("You are about to merge more than 1 object between layers ''{0}'' and ''{1}''.<br /><br />"+
091                        "<b>This is not the recommended way of merging such data</b>.<br />"+
092                        "You should instead check and merge each object, <b>one by one</b>.<br /><br />"+
093                        "Are you sure you want to continue?",
094                        getEditLayer().getName(), targetLayer.getName(), targetLayer.getName())+
095                "</html>",
096                ImageProvider.get("dialogs", "mergedown"), tr("Ignore this hint and merge anyway"));
097    }
098}