/*  Copyright (C) 2003-2011 JabRef contributors.
    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.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package net.sf.jabref.undo;

import javax.swing.undo.AbstractUndoableEdit;

import net.sf.jabref.BibtexDatabase;
import net.sf.jabref.Globals;

/**
 * This class represents a change in any field value. The relevant
 * information is the BibtexEntry, the field name, the old and the
 * new value. Old/new values can be null.
 */
public class UndoableKeyChange extends AbstractUndoableEdit {

    private String entryId;
    private BibtexDatabase base;
    private String oldValue, newValue;

    public UndoableKeyChange(BibtexDatabase base, String entryId,
			     String oldValue, String newValue) {
	this.base = base;
	this.entryId = entryId;
	this.oldValue = oldValue;
	this.newValue = newValue;
    }

    public String getUndoPresentationName() {
	return Globals.lang("Undo")+": "+Globals.lang("change key");
    }

    public String getRedoPresentationName() {
	return Globals.lang("Redo")+": "+Globals.lang("change key");
    }

    public void undo() {
	super.undo();
	
	// Revert the change.
	set(oldValue);
    }

    public void redo() {
	super.redo();

	// Redo the change.
	set(newValue);
    }

    private void set(String to) {
	base.setCiteKeyForEntry(entryId, to);
    }

}