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;
020import org.openstreetmap.josm.tools.Utils;
021
022/**
023 * Merge the currently selected objects into another layer.
024 * @since 1890
025 */
026public class MergeSelectionAction extends AbstractMergeAction {
027
028    /**
029     * Constructs a new {@code MergeSelectionAction}.
030     */
031    public MergeSelectionAction() {
032        super(tr("Merge selection"), "dialogs/mergedown", tr("Merge the currently selected objects into another layer"),
033            Shortcut.registerShortcut("system:mergeselection", tr("Edit: {0}", tr("Merge selection")),
034            KeyEvent.VK_M, Shortcut.CTRL_SHIFT),
035            true /* register */
036        );
037        setHelpId(ht("/Action/MergeSelection"));
038    }
039
040    /**
041     * Merge the currently selected objects into another layer.
042     */
043    public void mergeSelected() {
044        OsmDataLayer editLayer = getLayerManager().getEditLayer();
045        List<Layer> targetLayers = LayerListDialog.getInstance().getModel().getPossibleMergeTargets(editLayer);
046        if (targetLayers.isEmpty()) {
047            warnNoTargetLayersForSourceLayer(editLayer);
048            return;
049        }
050        Layer targetLayer = askTargetLayer(targetLayers);
051        if (targetLayer == null)
052            return;
053        if (editLayer.isUploadDiscouraged() && targetLayer instanceof OsmDataLayer
054                && !((OsmDataLayer) targetLayer).isUploadDiscouraged()
055                && editLayer.data.getAllSelected().size() > 1
056                && warnMergingUploadDiscouragedObjects(targetLayer)) {
057            return;
058        }
059        MergeSourceBuildingVisitor builder = new MergeSourceBuildingVisitor(editLayer.getDataSet());
060        ((OsmDataLayer) targetLayer).mergeFrom(builder.build());
061    }
062
063    @Override
064    public void actionPerformed(ActionEvent e) {
065        OsmDataLayer editLayer = getLayerManager().getEditLayer();
066        if (editLayer == null || editLayer.data.selectionEmpty())
067            return;
068        mergeSelected();
069    }
070
071    @Override
072    protected void updateEnabledState() {
073        updateEnabledStateOnCurrentSelection();
074    }
075
076    @Override
077    protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
078        updateEnabledStateOnModifiableSelection(selection);
079    }
080
081    /**
082     * Warns the user about merging too many objects with different upload policies.
083     * @param targetLayer Target layer
084     * @return true if the user wants to cancel, false if they want to continue
085     */
086    public final boolean warnMergingUploadDiscouragedObjects(Layer targetLayer) {
087        return GuiHelper.warnUser(tr("Merging too many objects with different upload policies"),
088                "<html>" +
089                tr("You are about to merge more than 1 object between layers ''{0}'' and ''{1}''.<br /><br />"+
090                        "<b>This is not the recommended way of merging such data</b>.<br />"+
091                        "You should instead check and merge each object, <b>one by one</b>.<br /><br />"+
092                        "Are you sure you want to continue?",
093                        Utils.escapeReservedCharactersHTML(getLayerManager().getEditLayer().getName()),
094                        Utils.escapeReservedCharactersHTML(targetLayer.getName()),
095                        Utils.escapeReservedCharactersHTML(targetLayer.getName()))+
096                "</html>",
097                ImageProvider.get("dialogs", "mergedown"), tr("Ignore this hint and merge anyway"));
098    }
099}