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Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation
simple. It is a class library for editing bytecodes in Java.
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.compiler.ast;
import javassist.compiler.CompileError;
import javassist.compiler.TokenId;
/**
* Double constant.
*/
public class DoubleConst extends ASTree {
protected double value;
protected int type;
public DoubleConst(double v, int tokenId) { value = v; type = tokenId; }
public double get() { return value; }
public void set(double v) { value = v; }
/* Returns DoubleConstant or FloatConstant
*/
public int getType() { return type; }
public String toString() { return Double.toString(value); }
public void accept(Visitor v) throws CompileError {
v.atDoubleConst(this);
}
public ASTree compute(int op, ASTree right) {
if (right instanceof IntConst)
return compute0(op, (IntConst)right);
else if (right instanceof DoubleConst)
return compute0(op, (DoubleConst)right);
else
return null;
}
private DoubleConst compute0(int op, DoubleConst right) {
int newType;
if (this.type == TokenId.DoubleConstant
|| right.type == TokenId.DoubleConstant)
newType = TokenId.DoubleConstant;
else
newType = TokenId.FloatConstant;
return compute(op, this.value, right.value, newType);
}
private DoubleConst compute0(int op, IntConst right) {
return compute(op, this.value, (double)right.value, this.type);
}
private static DoubleConst compute(int op, double value1, double value2,
int newType)
{
double newValue;
switch (op) {
case '+' :
newValue = value1 + value2;
break;
case '-' :
newValue = value1 - value2;
break;
case '*' :
newValue = value1 * value2;
break;
case '/' :
newValue = value1 / value2;
break;
case '%' :
newValue = value1 % value2;
break;
default :
return null;
}
return new DoubleConst(newValue, newType);
}
}
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