simplegroup.java

ErGo是一个很早的Java通用围棋服务器(IGS/NNGS)客户端程序。有全部源码和文档

package ergo.util;

// $Id: SimpleGroup.java,v 1.4 1999/08/13 01:20:43 sigue Exp $

/*
 *  Copyright (C) 1999  Carl L. Gay and Antranig M. Basman.
 *  See the file copyright.txt, distributed with this software,
 *  for further information.
 */

import ergo.logic.Move;


public class SimpleGroup {

  private int color;
  private PositionVector positions = new PositionVector();

  public int size () { return positions.size(); }

  public int color () { return color; }

  public boolean isMember (Position pos) {
    for (int i = 0; i < positions.size(); i++)
      if (pos.equals(positions.elementAt(i)))
	return true;
    return false;
  }

  public Position positionAt (int index) { return positions.elementAt(index); }

  protected PositionVector liberties = new PositionVector(4);

  public SimpleGroup (int color) { this.color = color; }

  public int numberOfLiberties () { return liberties.size(); }

  public void addPosition (Position pos) {
    if (isLiberty(pos))
      removeLiberty(pos);
    if (!isMember(pos))
      positions.addElement(pos);
  }

  public void removePosition (Position pos) {
    for (int i = 0; i < positions.size(); i++)
      if (positions.elementAt(i).equals(pos)) {
	positions.removeElementAt(i);
	addLiberty(pos);
      }
  }

  public void addLiberty (Position lib) {
    if (!isLiberty(lib))
      liberties.addElement(lib);
  }

  public void removeLiberty (Position lib) {
    for (int i = 0; i < liberties.size(); i++)
      if (lib.equals(liberties.elementAt(i))) {
	liberties.removeElementAt(i);
	return;
      }
  }

  public Position libertyAt (int index) {
    return liberties.elementAt(index);
  }

  public boolean isLiberty (Position pos) {
    for (int i = 0; i < liberties.size(); i++)
      if (pos.equals(liberties.elementAt(i)))
	return true;
    return false;
  }

  public String toString () {
    // +++ Should remove this dependency on Move by defining a class
    //     to represent stone colors.
    return ((color == Move.BLACK ? "Black: " : "White: ")
	    + positions.toString()
	    + " -- " + liberties.toString());
  }

  // For debugging only
  public boolean equals (SimpleGroup other) {
    if (numberOfLiberties() != other.numberOfLiberties()
	|| size() != other.size())
      return false;
    else {
      for (int i = 0; i < positions.size(); i++)
	if (!other.isMember(positions.elementAt(i)))
	  return false;
      for (int i = 0; i < liberties.size(); i++)
	if (!other.isLiberty(liberties.elementAt(i)))
	  return false;
      return true;
    }
  }

}  // end class SimpleGroup