100 lines
2.9 KiB
Java
100 lines
2.9 KiB
Java
/*
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* Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* The Original Code is HAT. The Initial Developer of the
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* Original Code is Bill Foote, with contributions from others
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* at JavaSoft/Sun.
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*/
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package com.sun.tools.hat.internal.model;
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import java.util.Enumeration;
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import java.util.Hashtable;
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/**
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*
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* @author Bill Foote
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*/
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/**
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* Represents a java "Thing". A thing is anything that can be the value of
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* a field. This includes JavaHeapObject, JavaObjectRef, and JavaValue.
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*/
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public abstract class JavaThing {
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protected JavaThing() {
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}
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/**
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* If this is a forward reference, figure out what it really
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* refers to.
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*
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* @param snapshot The snapshot this is for
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* @param field The field this thing represents. If null, it is
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* assumed this thing is an object (and never a value).
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*/
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public JavaThing dereference(Snapshot shapshot, JavaField field) {
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return this;
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}
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/**
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* Are we the same type as other?
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*
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* @see JavaObject.isSameTypeAs()
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*/
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public boolean isSameTypeAs(JavaThing other) {
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return getClass() == other.getClass();
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}
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/**
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* @return true iff this represents a heap-allocated object
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*/
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abstract public boolean isHeapAllocated();
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/**
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* @return the size of this object, in bytes, including VM overhead
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*/
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abstract public int getSize();
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/**
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* @return a human-readable string representation of this thing
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*/
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abstract public String toString();
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/**
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* Compare our string representation to other's
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* @see java.lang.String.compareTo()
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*/
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public int compareTo(JavaThing other) {
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return toString().compareTo(other.toString());
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}
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}
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