/* ======================================================================
   Parts Copyright 2006 University of Leeds, Oxford University, University of the Highlands and Islands.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

====================================================================== */

package org.bodington.util;

/**
 * This is a threadsafe counter.  It is suspected that it is
 * not safe for multiple threads to increment and decrement
 * a shared int (as observed in BuildingServlet.doGet()) so
 * this class uses sychronized methods to make a thread
 * safe counter.
 * @author bmb6jrm
 */
public class Counter
{
    
    int value;
    
    /** Creates new Counter */
    public Counter()
    {
	value=0;
    }
    
    /**
     * Gets the current value.
     * @return The current value.
     */
    public synchronized int intValue()
    {
        return value;
    }
    
    /**
     * Increment the value by one.
     * @return The new value.
     */
    public synchronized int increment()
    {
	 return ++value;
    }
    
    /**
     * Decrement the value by one.
     * @return The new value.
     */
    public synchronized int decrement()
    {
        return --value;
    }
    
}