112 lines
2.6 KiB
Java
112 lines
2.6 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.ssa;
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/**
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* The value of a constant which appears in an SSA IR.
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*/
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public class ConstantValue implements Value {
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final private Object constant;
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public ConstantValue(Object constant) {
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this.constant = constant;
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}
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public ConstantValue(int constant) {
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this(Integer.valueOf(constant));
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}
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public ConstantValue(double constant) {
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this(Double.valueOf(constant));
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}
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/**
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* @return an object which represents the constant value
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*/
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public Object getValue() {
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return constant;
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}
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@Override
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public String toString() {
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return "#" + constant;
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}
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/*
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* @see com.ibm.wala.ssa.Value#isStringConstant()
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*/
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@Override
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public boolean isStringConstant() {
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return constant instanceof String;
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}
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/**
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* @return true iff this constant is "false"
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*/
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public boolean isFalseConstant() {
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return (constant instanceof Boolean) && constant.equals(Boolean.FALSE);
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}
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/**
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* @return true iff this constant is "true"
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*/
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public boolean isTrueConstant() {
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return (constant instanceof Boolean) && constant.equals(Boolean.TRUE);
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}
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/**
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* @return true iff this constant is "zero"
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*/
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public boolean isZeroConstant() {
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return ( (constant instanceof Number) &&
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(((Number) constant).intValue() == 0) );
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}
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/**
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* @return true iff this constant is "null"
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*/
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@Override
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public boolean isNullConstant() {
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return (constant == null);
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}
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/**
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* @return true iff this constant is "one"
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*/
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public boolean isOneConstant() {
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return ( (constant instanceof Number) &&
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(((Number) constant).intValue() == 1) );
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}
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@Override
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public boolean equals(Object obj) {
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if (obj == null) {
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return false;
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}
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if (obj.getClass().equals(getClass())) {
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ConstantValue other = (ConstantValue)obj;
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if (constant == null) {
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return other.constant == null;
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}
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return constant.equals(other.constant);
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} else {
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return false;
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}
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}
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@Override
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public int hashCode() {
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return constant == null ? 74 : 91 * constant.hashCode();
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}
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}
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