www.pudn.com > src.rar > ObjectHandle.java

/* 
* Copyright (c) 1996, 1997 Bill Venners. All Rights Reserved. 
* 
* This Java source file is part of the Interactive Illustrations Web 
* Site, which is delivered in the applets directory of the CD-ROM 
* that accompanies the book "Inside the Java Virtual Machine" by Bill 
* Venners, published by McGraw-Hill, 1997,ISBN: 0-07-913248-0. This 
* source file is provided for evaluation purposes only, but you can 
* redistribute it under certain conditions, described in the full 
* copyright notice below. 
* 
* Full Copyright Notice: 
* 
* All the web pages and Java applets delivered in the applets 
* directory of the CD-ROM, consisting of ".html," ".gif," ".class," 
* and ".java" files, are copyrighted (c) 1996, 1997 by Bill 
* Venners, and all rights are reserved.  This material may be copied 
* and placed on any commercial or non-commercial web server on any 
* network (including the internet) provided that the following 
* guidelines are followed: 
* 
* a. All the web pages and Java Applets (".html," ".gif," ".class," 
* and ".java" files), including the source code, that are delivered 
* in the applets directory of the CD-ROM that 
* accompanies the book must be published together on the same web 
* site. 
* 
* b. All the web pages and Java Applets (".html," ".gif," ".class," 
* and ".java" files) must be published "as is" and may not be altered 
* in any way. 
* 
* c. All use and access to this web site must be free, and no fees 
* can be charged to view these materials, unless express written 
* permission is obtained from Bill Venners. 
* 
* d. The web pages and Java Applets may not be distributed on any 
* media, other than a web server on a network, and may not accompany 
* any book or publication. 
* 
* BILL VENNERS MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE 
* SUITABILITY OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING 
* BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, 
* FITNESS FOR PARTICULAR PURPOSE, OR NON-INFRINGEMENT.  BILL VENNERS 
* SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY A LICENSEE AS A 
* RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS 
* DERIVATIVES. 
*/ 
import java.awt.Point; 
import java.awt.Color; 
 
/** 
* The object pool of the garbage-collected heap simulated 
* by the HeapOfFish applet is made up of references to 
* instances of this class. 
* 
* ObjectHandle contains: 
* 
*      free -- indicates whether this handle is currently being used. 
*      objectPos -- the index into the objectPool array of bytes at which the object 
*          data is located 
*      fish -- an object which contains information about this object. Normally this 
*          object would hold constant pool info, methods, etc.... 
* @author  Bill Venners 
*/ 
public class ObjectHandle { 
 
    public boolean free; 
    public int objectPos; 
    public FishIcon fish; 
 
    //public boolean currentGCMarkNode; 
 
    // The previous node in GC traversal was either a fish or a local variable root node 
    public boolean previousNodeInGCTraversalIsAFish; 
    public int previousFishInGCTraversal; 
 
    // If a node has not yet been traversed its color is white. A node that has been 
    // traversed in an upward direction (where the root is at the bottom) is gray. When 
    // the node is again traversed back in a downward direction, its color is changed 
    // to black. 
    public Color myColor; 
    public Color myFriendLineColor; 
    public Color myLunchLineColor; 
    public Color mySnackLineColor; 
 
    public boolean gotFriend; 
    public Point myFriendLineStart; 
    public Point myFriendLineEnd; 
 
    public boolean gotLunch; 
    public Point myLunchLineStart; 
    public Point myLunchLineEnd; 
 
    public boolean gotSnack; 
    public Point mySnackLineStart; 
    public Point mySnackLineEnd; 
}