/* * Copyright (c) 1996-1999 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 2 Virtual Machine" by Bill * Venners, published by McGraw-Hill, 1999, ISBN: 0-07-135093-4. 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) 1996-1999 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; }