ChannelSetTransferHandler.java

/*
 * Copyright (c) Henrik Niehaus & Lazy Bones development team
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of the project (Lazy Bones) nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package lazybones.gui.settings.channelpanel.dnd;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

import javax.swing.JComponent;
import javax.swing.TransferHandler;

import lazybones.LazyBones;

import org.hampelratte.svdrp.responses.highlevel.Channel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class ChannelSetTransferHandler extends TransferHandler {

    protected abstract ChannelSet<Channel> exportChannels(JComponent c);

    protected abstract void importChannels(JComponent c, ChannelSet<Channel> set);

    protected abstract void cleanup(JComponent c, Transferable data, boolean remove);

    private static transient Logger logger = LoggerFactory.getLogger(LazyBones.class);

    @Override
    protected Transferable createTransferable(JComponent c) {
        return exportChannels(c);
    }

    @Override
    public int getSourceActions(JComponent c) {
        return MOVE;
    }

    @Override
    @SuppressWarnings("unchecked")
    public boolean importData(JComponent c, Transferable t) {
        if (canImport(c, t.getTransferDataFlavors())) {
            try {
                ChannelSet<Channel> set = (ChannelSet<Channel>) t.getTransferData(ChannelSet.FLAVOR);
                importChannels(c, set);
                return true;
            } catch (UnsupportedFlavorException ufe) {
                logger.error("Data not suitable for drag and drop", ufe);
            } catch (IOException ioe) {
                logger.error("Error during drag and drop", ioe);
            }
        }

        return false;
    }

    @Override
    protected void exportDone(JComponent c, Transferable data, int action) {
        cleanup(c, data, action == MOVE);
    }

    @Override
    public boolean canImport(JComponent c, DataFlavor[] flavors) {
        for (int i = 0; i < flavors.length; i++) {
            if (ChannelSet.FLAVOR.equals(flavors[i])) {
                return true;
            }
        }
        return false;
    }
}