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

 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.groups;

import javax.swing.undo.AbstractUndoableEdit;

import net.sf.jabref.Globals;

class UndoableResetGroups extends AbstractUndoableEdit {
    /** A backup of the groups before the modification */
    private final GroupTreeNode m_groupsBackup;
    /** A handle to the global groups root node */
    private final GroupTreeNode m_groupsRootHandle;
    private final GroupSelector m_groupSelector;
    private boolean m_revalidate = true;

    public UndoableResetGroups(GroupSelector groupSelector,
            GroupTreeNode groupsRoot) {
        this.m_groupsBackup = groupsRoot.deepCopy();
        this.m_groupsRootHandle = groupsRoot;
        this.m_groupSelector = groupSelector;
    }

    public String getUndoPresentationName() {
        return Globals.lang("Undo") + ": " 
            + Globals.lang("clear all groups");
    }

    public String getRedoPresentationName() {
        return Globals.lang("Redo") + ": " 
            + Globals.lang("clear all groups");
    }

    public void undo() {
        super.undo();
        // keep root handle, but restore everything else from backup
        m_groupsRootHandle.removeAllChildren();
        m_groupsRootHandle.setGroup(m_groupsBackup.getGroup().deepCopy());
        for (int i = 0; i < m_groupsBackup.getChildCount(); ++i)
            m_groupsRootHandle.add(((GroupTreeNode) m_groupsBackup
                    .getChildAt(i)).deepCopy());
        if (m_revalidate)
            m_groupSelector.revalidateGroups();
    }

    public void redo() {
        super.redo();
        m_groupsRootHandle.removeAllChildren();
        m_groupsRootHandle.setGroup(new AllEntriesGroup());
        if (m_revalidate)
            m_groupSelector.revalidateGroups();
    }

    /**
     * Call this method to decide if the group list should be immediately
     * revalidated by this operation. Default is true.
     */
    public void setRevalidate(boolean revalidate) {
        m_revalidate = revalidate;
    }
}