001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.gui.datatransfer;
003
004import java.awt.datatransfer.UnsupportedFlavorException;
005import java.io.IOException;
006import java.util.Arrays;
007import java.util.Collection;
008
009import javax.swing.JComponent;
010import javax.swing.TransferHandler;
011
012import org.openstreetmap.josm.Main;
013import org.openstreetmap.josm.data.coor.EastNorth;
014import org.openstreetmap.josm.gui.datatransfer.importers.AbstractOsmDataPaster;
015import org.openstreetmap.josm.gui.layer.OsmDataLayer;
016import org.openstreetmap.josm.tools.bugreport.BugReport;
017
018/**
019 * A transfer handler class that allows you to manage a prioritized stack of transfer handlers.
020 * @author Michael Zangl
021 * @since 10881
022 */
023public abstract class AbstractStackTransferHandler extends TransferHandler {
024
025    protected abstract Collection<AbstractOsmDataPaster> getSupportedPasters();
026
027    @Override
028    public int getSourceActions(JComponent c) {
029        return COPY;
030    }
031
032    @Override
033    public boolean canImport(TransferSupport support) {
034        // import everything for now, only support copy.
035        for (AbstractOsmDataPaster df : getSupportedPasters()) {
036            if (df.supports(support)) {
037                return true;
038            }
039        }
040        return false;
041    }
042
043    @Override
044    public boolean importData(TransferSupport support) {
045        return importData(support, Main.getLayerManager().getEditLayer(), null);
046    }
047
048    protected boolean importData(TransferSupport support, OsmDataLayer layer, EastNorth center) {
049        for (AbstractOsmDataPaster df : getSupportedPasters()) {
050            if (df.supports(support)) {
051                try {
052                    if (Main.isDebugEnabled()) {
053                        Main.debug("{0} pasting {1} at {2}", df.getClass().getSimpleName(), Arrays.toString(support.getDataFlavors()), center);
054                    }
055                    if (df.importData(support, layer, center)) {
056                        return true;
057                    }
058                } catch (UnsupportedFlavorException | IOException e) {
059                    Main.warn(e);
060                } catch (RuntimeException e) {
061                    BugReport.intercept(e).put("paster", df).put("flavors", support::getDataFlavors).warn();
062                }
063            }
064        }
065        return super.importData(support);
066    }
067}