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/*
 * The JTS Topology Suite is a collection of Java classes that
 * implement the fundamental operations required to validate a given
 * geo-spatial data set to a known topological specification.
 *
 * Copyright (C) 2001 Vivid Solutions
 *
 * This library 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.
 *
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * For more information, contact:
 *
 *     Vivid Solutions
 *     Suite #1A
 *     2328 Government Street
 *     Victoria BC  V8T 5G5
 *     Canada
 *
 *     (250)385-6040
 *     www.vividsolutions.com
 */
package com.vividsolutions.jts.util;

import java.util.*;

/**
 * Counts occurences of objects.
 * 
 * @author Martin Davis
 *
 */
public class ObjectCounter 
{

  private Map counts = new HashMap();
  
  public ObjectCounter() {
  }

  public void add(Object o)
  {
    Counter counter = (Counter) counts.get(o);
    if (counter == null)
      counts.put(o, new Counter(1));
    else
      counter.increment();
  }
  
  // TODO: add remove(Object o)
  
  public int count(Object o)
  {
    Counter counter = (Counter) counts.get(o);
    if (counter == null)
      return 0;
    else
      return counter.count();
   
  }
  private static class Counter
  {
    int count = 0;
    
    public Counter()
    {
      
    }
    
    public Counter(int count)
    {
      this.count = count;
    }
    
    public int count()
    {
      return count;
    }
    
    public void increment()
    {
      count++;
    }
  }
}