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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 | } | ||