/*
Copyright (C) 2003 Nizar N. Batada, Morten O. Alver

All programs in this directory and
subdirectories are published under the GNU General Public License as
described below.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA

Further information about the GNU GPL is available at:
http://www.gnu.org/copyleft/gpl.ja.html

*/

package net.sf.jabref;

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

import javax.swing.JOptionPane;

import net.sf.jabref.export.LatexFieldFormatter;

/*
 * A transferable object containing an array of BibtexEntry objects. Used
 * for copy-paste operations.
 */
public class TransferableBibtexEntry implements Transferable {

    private BibtexEntry[] data;
    public static DataFlavor entryFlavor = new DataFlavor(BibtexEntry.class, "JabRef entry");

    public TransferableBibtexEntry(BibtexEntry[] data) {
	this.data = data;
    }

    public DataFlavor[] getTransferDataFlavors() {
	return new DataFlavor[] {TransferableBibtexEntry.entryFlavor,
	                         DataFlavor.stringFlavor};
    }

    public boolean isDataFlavorSupported(DataFlavor flavor) {
	return (flavor.equals(entryFlavor) ||
		flavor.equals(DataFlavor.stringFlavor));
    }

    public Object getTransferData(DataFlavor flavor)
	throws UnsupportedFlavorException {
	if (flavor.equals(entryFlavor))
	    return data;
	else if (flavor.equals(DataFlavor.stringFlavor)) {
	    try {
		StringWriter sw = new StringWriter();
		LatexFieldFormatter ff = new LatexFieldFormatter();
		for (int i=0; i<data.length; i++)
		    data[i].write(sw, ff, false);
		return sw.toString();
	    } catch (IOException ex) {
		JOptionPane.showMessageDialog
		    (null, "Could not paste entry as text:\n"+ex.getMessage(),
		     "Clipboard", JOptionPane.ERROR_MESSAGE);
		return "";
	    }
	} else
	    throw new UnsupportedFlavorException(flavor);
    }
}