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/*
 * 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 com.feilong.lib.javassist.compiler.ast;

import com.feilong.lib.javassist.compiler.CompileError;
import com.feilong.lib.javassist.compiler.TokenId;

/**
 * Integer constant.
 */
public class IntConst extends ASTree{

    /** default serialVersionUID */
    private static final long serialVersionUID = 1L;

    protected long            value;

    protected int             type;

    public IntConst(long v, int tokenId){
        value = v;
        type = tokenId;
    }

    public long get(){
        return value;
    }

    public void set(long v){
        value = v;
    }

    /*
     * Returns IntConstant, CharConstant, or LongConstant.
     */
    public int getType(){
        return type;
    }

    @Override
    public String toString(){
        return Long.toString(value);
    }

    @Override
    public void accept(Visitor v) throws CompileError{
        v.atIntConst(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 IntConst compute0(int op,IntConst right){
        int type1 = this.type;
        int type2 = right.type;
        int newType;
        if (type1 == TokenId.LongConstant || type2 == TokenId.LongConstant){
            newType = TokenId.LongConstant;
        }else if (type1 == TokenId.CharConstant && type2 == TokenId.CharConstant){
            newType = TokenId.CharConstant;
        }else{
            newType = TokenId.IntConstant;
        }

        long value1 = this.value;
        long value2 = right.value;
        long 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;
            case '|':
                newValue = value1 | value2;
                break;
            case '^':
                newValue = value1 ^ value2;
                break;
            case '&':
                newValue = value1 & value2;
                break;
            case TokenId.LSHIFT:
                newValue = value << (int) value2;
                newType = type1;
                break;
            case TokenId.RSHIFT:
                newValue = value >> (int) value2;
                newType = type1;
                break;
            case TokenId.ARSHIFT:
                newValue = value >>> (int) value2;
                newType = type1;
                break;
            default:
                return null;
        }

        return new IntConst(newValue, newType);
    }

    private DoubleConst compute0(int op,DoubleConst right){
        double value1 = this.value;
        double value2 = right.value;
        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, right.type);
    }
}