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OpenL Constraint Programming engine

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package org.openl.ie.constrainer.impl;

import org.openl.ie.constrainer.Constrainer;
import org.openl.ie.constrainer.ConstrainerObjectImpl;
import org.openl.ie.constrainer.Undo;
import org.openl.ie.constrainer.Undoable;

///////////////////////////////////////////////////////////////////////////////
/*
 * Copyright Exigen Group 1998, 1999, 2000
 * 320 Amboy Ave., Metuchen, NJ, 08840, USA, www.exigengroup.com
 *
 * The copyright to the computer program(s) herein
 * is the property of Exigen Group, USA. All rights reserved.
 * The program(s) may be used and/or copied only with
 * the written permission of Exigen Group
 * or in accordance with the terms and conditions
 * stipulated in the agreement/contract under which
 * the program(s) have been supplied.
 */
///////////////////////////////////////////////////////////////////////////////
/**
 * An implementation of the Undoable interface for the undoable only once object.
 */
public abstract class UndoableOnceImpl extends ConstrainerObjectImpl implements Undoable {
    protected boolean _undone;

    /**
     * Constructor with a given constrainer.
     */
    public UndoableOnceImpl(Constrainer c) {
        this(c, "");
    }

    /**
     * Constructor with a given constrainer and name.
     */
    public UndoableOnceImpl(Constrainer c, String name) {
        super(c, name);
        _undone = false;
    }

    @Override
    public void addUndo() {
        if (!_undone) {
            _undone = true;
            Undo undo_object = createUndo();
            undo_object.undoable(this);
            // Debug.on();Debug.print("add " + undo_object);Debug.off();
            // constrainer().addUndo(undo_object);
            constrainer().addUndo(undo_object, this);
        }
    }

    public final void restore() {
        _undone = false;
    }

} // ~UndoableOnceImpl