/*
 * Copyright (C) 2005 - 2006 JasperSoft Corporation.  All rights reserved. 
 * http://www.jaspersoft.com.
 *
 * Unless you have purchased a commercial license agreement from JasperSoft,
 * the following license terms apply:
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed WITHOUT ANY WARRANTY; and without the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see http://www.gnu.org/licenses/gpl.txt
 * or write to:
 *
 * Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330,
 * Boston, MA  USA  02111-1307
 *
 *
 *
 *
 * ColumnTransferableHandler.java
 * 
 * Created on 21 maggio 2003, 18.43
 *
 */

package it.businesslogic.ireport.gui.dnd;
import java.awt.dnd.*;
import javax.swing.*;
import java.awt.datatransfer.*;
import java.io.*;

/**
 *
 * @author  Administrator
 */
public abstract class ColumnTransferableHandler extends TransferHandler {
    
    protected abstract String exportString(JComponent c);
    protected abstract void importString(JComponent c, String str);
    protected abstract void cleanup(JComponent c, boolean remove);
    
    protected Transferable createTransferable(JComponent c) {
        return new StringSelection(exportString(c));
    }
    
    public int getSourceActions(JComponent c) {
        return COPY_OR_MOVE;
    }
    
    public boolean importData(JComponent c, Transferable t) {
        if (canImport(c, t.getTransferDataFlavors())) {
            try {
                String str = (String)t.getTransferData(DataFlavor.stringFlavor);
                importString(c, str);
                return true;
            } catch (UnsupportedFlavorException ufe) {
            } catch (IOException ioe) {
            }
        }

        return false;
    }
    
    protected void exportDone(JComponent c, Transferable data, int action) {
        cleanup(c, action == MOVE);
    }
    
    public boolean canImport(JComponent c, DataFlavor[] flavors) {
        for (int i = 0; i < flavors.length; i++) {
            if (DataFlavor.stringFlavor.equals(flavors[i])) {
                return true;
            }
        }
        return false;
    }
    
}


