/* StepFilter.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)
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General Public License for more details.

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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
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permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
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package gnu.classpath.jdwp.event.filters;

import gnu.classpath.jdwp.event.Event;
import gnu.classpath.jdwp.exception.InvalidThreadException;
import gnu.classpath.jdwp.id.ThreadId;

/**
 * "An event filter which restricts reported step events to those which
 * satisfy depth and size constraints. This modifier can only be used with
 * step event kinds."
 *
 * @author Keith Seitz  (keiths@redhat.com)
 */
public class StepFilter
  implements IEventFilter
{
  private ThreadId _tid;
  private int _size;
  private int _depth;

  /**
   * Constructs a new StepFilter
   *
   * @param tid    ID of the thread in which to step
   * @param size   size of each step
   * @param depth  relative call stack limit
   * @throws InvalidThreadException if thread is invalid
   */
  public StepFilter (ThreadId tid, int size, int depth)
    throws InvalidThreadException
  {
    if (tid.getReference().get () == null)
      throw new InvalidThreadException (tid.getId ());

    _tid = tid;
    _size = size;
    _depth = depth;
  }

  /**
   * Returns the thread in which to step
   *
   * @return the thread's ID
   */
  public ThreadId getThread ()
  {
    return _tid;
  }

  /**
   * Returns the size of each step (insn, line)
   *
   * @return the step size
   * @see gnu.classpath.jdwp.JdwpConstants.StepSize
   */
  public int getSize ()
  {
    return _size;
  }

  /**
   * Returns the relative call stack limit (into, over, out)
   *
   * @return how to step
   * @see gnu.classpath.jdwp.JdwpConstants.StepDepth
   */
  public int getDepth ()
  {
    return _depth;
  }

  /**
   * Does the given event match the filter?
   *
   * @param event  the <code>Event</code> to scrutinize
   */
  public boolean matches (Event event)
  {
    // FIXME
    throw new RuntimeException ("StepFilter.matches not implemented");
  }
}