/* Copyright (C) 1997-2007  The Chemistry Development Kit (CDK) project
 *
 * Contact: cdk-devel@lists.sourceforge.net
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 * All we ask is that proper credit is given for our work, which includes
 * - but is not limited to - adding the above copyright notice to the beginning
 * of your source code files, and to any copyright notice that you may distribute
 * with programs based on this work.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */
package org.openscience.cdk.ringsearch;


import java.util.Vector;

/**
 * Implementation of a Queue (FIFO stack).
 *
 * @cdk.module standard
 * @cdk.githash
 * @deprecated internal implemenation detail from SSSRFinder, do not use
 */
@Deprecated
public class Queue extends Vector {

    private static final long serialVersionUID = 1008167867733841614L;

    /**
     * Constructs an empty Queue
     *
     */
    public Queue() {
        super();
    }

    /**
     *  Places an Object into the queue
     *
     * @param   o  The object to be pushed into the queue
     */
    public void push(Object o) {
        addElement(o);
    }

    /**
     * Returns an Object from the queue
     *
     * @return The object that had been pushed first into the queue
     */
    public Object pop() {
        Object o = elementAt(0);
        removeElementAt(0);
        return o;
    }
}
