69 lines
1.9 KiB
Java
69 lines
1.9 KiB
Java
/*******************************************************************************
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* Copyright (c) 2002 - 2006 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.analysis.typeInference;
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import com.ibm.wala.classLoader.IClass;
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import com.ibm.wala.ipa.callgraph.ContextItem;
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import com.ibm.wala.util.debug.Assertions;
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/**
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*
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* Absraction of a Java type. These are immutable.
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*
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* @author sfink
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*/
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public abstract class TypeAbstraction implements ContextItem {
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/**
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* Canonical element representing TOP for a dataflow lattice
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*/
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public final static TypeAbstraction TOP = new TypeAbstraction() {
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public TypeAbstraction meet(TypeAbstraction rhs) {
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return rhs;
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}
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public String toString() {
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return "JavaTypeAbstraction.TOP";
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}
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public int hashCode() {
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return 17;
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}
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public boolean equals(Object other) {
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return this == other;
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}
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public IClass getType() {
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return null;
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}
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};
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public abstract TypeAbstraction meet(TypeAbstraction rhs);
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/**
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* @see java.lang.Object#equals(Object)
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*/
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public abstract boolean equals(Object obj);
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/**
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* @see java.lang.Object#hashCode()
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*/
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public abstract int hashCode();
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/**
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* This is here for convenience; it makes sense for Point and Cone Dispatch.
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* TODO: probably should get rid of it.
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*/
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public IClass getType() {
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Assertions.UNREACHABLE("getType not implemented for " + getClass());
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return null;
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}
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}
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