/* CountFilter.java -- a step filter
   Copyright (C) 2005 Free Software Foundation

This file is part of GNU Classpath.

GNU Classpath 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, or (at your option)
any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
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package gnu.classpath.jdwp.event.filters;

import gnu.classpath.jdwp.event.Event;
import gnu.classpath.jdwp.exception.InvalidCountException;

/**
 * An ignore count filter.
 *
 * @author Keith Seitz  (keiths@redhat.com)
 */
public class CountFilter
  implements IEventFilter
{
  // the count
  private int _count;

  /**
   * Constructs a new <code>CountFilter</code> with the given count.
   *
   * @param  count  the number of times the event will be ignored
   * @throws InvalidCountException if count is invalid (< 1)
   */
  public CountFilter (int count)
    throws InvalidCountException
  {
    // Check for valid count
    if (count < 1)
      throw new InvalidCountException (count);

    _count = count;
  }

  /**
   * Returns the ignore count
   *
   * @return the number of times the event should be ignored
   */
  public int getCount ()
  {
    return _count;
  }

  /**
   * Does the given event match the filter?
   *
   * @param event  the <code>Event</code> to scrutinize
   */
  public boolean matches (Event event)
  {
    // This filter only relies on its count
    if (--_count == 0)
      return true;

    return false;
  }
}