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.data.coor.EastNorth;
013import org.openstreetmap.josm.gui.MainApplication;
014import org.openstreetmap.josm.gui.datatransfer.importers.AbstractOsmDataPaster;
015import org.openstreetmap.josm.gui.layer.OsmDataLayer;
016import org.openstreetmap.josm.tools.JosmRuntimeException;
017import org.openstreetmap.josm.tools.Logging;
018import org.openstreetmap.josm.tools.bugreport.BugReport;
019
020/**
021 * A transfer handler class that allows you to manage a prioritized stack of transfer handlers.
022 * @author Michael Zangl
023 * @since 10881
024 */
025public abstract class AbstractStackTransferHandler extends TransferHandler {
026
027    protected abstract Collection<AbstractOsmDataPaster> getSupportedPasters();
028
029    @Override
030    public int getSourceActions(JComponent c) {
031        return COPY;
032    }
033
034    @Override
035    public boolean canImport(TransferSupport support) {
036        // import everything for now, only support copy.
037        for (AbstractOsmDataPaster df : getSupportedPasters()) {
038            if (df.supports(support)) {
039                return true;
040            }
041        }
042        return false;
043    }
044
045    @Override
046    public boolean importData(TransferSupport support) {
047        return importData(support, MainApplication.getLayerManager().getEditLayer(), null);
048    }
049
050    protected boolean importData(TransferSupport support, OsmDataLayer layer, EastNorth center) {
051        for (AbstractOsmDataPaster df : getSupportedPasters()) {
052            if (df.supports(support)) {
053                try {
054                    if (Logging.isDebugEnabled()) {
055                        Logging.debug("{0} pasting {1} at {2}",
056                                df.getClass().getSimpleName(), Arrays.toString(support.getDataFlavors()), center);
057                    }
058                    if (df.importData(support, layer, center)) {
059                        return true;
060                    }
061                } catch (UnsupportedFlavorException | IOException e) {
062                    Logging.warn(e);
063                } catch (JosmRuntimeException | IllegalArgumentException | IllegalStateException e) {
064                    BugReport.intercept(e).put("paster", df).put("flavors", support::getDataFlavors).warn();
065                }
066            }
067        }
068        return super.importData(support);
069    }
070}