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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | + | |
| 27 | +/* | |
| 28 | + * The Original Code is HAT. The Initial Developer of the | |
| 29 | + * Original Code is Bill Foote, with contributions from others | |
| 30 | + * at JavaSoft/Sun. | |
| 31 | + */ | |
| 32 | + | |
| 33 | +package com.sun.tools.hat.internal.model; | |
| 34 | + | |
| 35 | +import java.util.Enumeration; | |
| 36 | +import java.util.Hashtable; | |
| 37 | + | |
| 38 | + | |
| 39 | +/** | |
| 40 | + * | |
| 41 | + * @author Bill Foote | |
| 42 | + */ | |
| 43 | + | |
| 44 | + | |
| 45 | +/** | |
| 46 | + * Represents a java "Thing". A thing is anything that can be the value of | |
| 47 | + * a field. This includes JavaHeapObject, JavaObjectRef, and JavaValue. | |
| 48 | + */ | |
| 49 | + | |
| 50 | +public abstract class JavaThing { | |
| 51 | + | |
| 52 | + protected JavaThing() { | |
| 53 | + } | |
| 54 | + | |
| 55 | + /** | |
| 56 | + * If this is a forward reference, figure out what it really | |
| 57 | + * refers to. | |
| 58 | + * | |
| 59 | + * @param snapshot The snapshot this is for | |
| 60 | + * @param field The field this thing represents. If null, it is | |
| 61 | + * assumed this thing is an object (and never a value). | |
| 62 | + */ | |
| 63 | + public JavaThing dereference(Snapshot shapshot, JavaField field) { | |
| 64 | + return this; | |
| 65 | + } | |
| 66 | + | |
| 67 | + | |
| 68 | + /** | |
| 69 | + * Are we the same type as other? | |
| 70 | + * | |
| 71 | + * @see JavaObject.isSameTypeAs() | |
| 72 | + */ | |
| 73 | + public boolean isSameTypeAs(JavaThing other) { | |
| 74 | + return getClass() == other.getClass(); | |
| 75 | + } | |
| 76 | + /** | |
| 77 | + * @return true iff this represents a heap-allocated object | |
| 78 | + */ | |
| 79 | + abstract public boolean isHeapAllocated(); | |
| 80 | + | |
| 81 | + /** | |
| 82 | + * @return the size of this object, in bytes, including VM overhead | |
| 83 | + */ | |
| 84 | + abstract public int getSize(); | |
| 85 | + | |
| 86 | + /** | |
| 87 | + * @return a human-readable string representation of this thing | |
| 88 | + */ | |
| 89 | + abstract public String toString(); | |
| 90 | + | |
| 91 | + /** | |
| 92 | + * Compare our string representation to other's | |
| 93 | + * @see java.lang.String.compareTo() | |
| 94 | + */ | |
| 95 | + public int compareTo(JavaThing other) { | |
| 96 | + return toString().compareTo(other.toString()); | |
| 97 | + } | |
| 98 | + | |
| 99 | +} | |