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Tomcat example source code file (

This example Tomcat source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

astnegative, bigdecimal, biginteger, byte, byte, double, float, integer, long, long, math, object, object, short, short

The Tomcat source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
/* Generated By:JJTree: Do not edit this line. */

package org.apache.el.parser;

import java.math.BigDecimal;
import java.math.BigInteger;

import javax.el.ELException;

import org.apache.el.lang.EvaluationContext;

 * @author Jacob Hookom []
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: markt $
public final class AstNegative extends SimpleNode {
    public AstNegative(int id) {

    public Class getType(EvaluationContext ctx)
            throws ELException {
        return Number.class;

    public Object getValue(EvaluationContext ctx)
            throws ELException {
        Object obj = this.children[0].getValue(ctx);

        if (obj == null) {
            return new Long(0);
        if (obj instanceof BigDecimal) {
            return ((BigDecimal) obj).negate();
        if (obj instanceof BigInteger) {
            return ((BigInteger) obj).negate();
        if (obj instanceof String) {
            if (isStringFloat((String) obj)) {
                return new Double(-Double.parseDouble((String) obj));
            return new Long(-Long.parseLong((String) obj));
        Class type = obj.getClass();
        if (obj instanceof Long || Long.TYPE == type) {
            return new Long(-((Long) obj).longValue());
        if (obj instanceof Double || Double.TYPE == type) {
            return new Double(-((Double) obj).doubleValue());
        if (obj instanceof Integer || Integer.TYPE == type) {
            return new Integer(-((Integer) obj).intValue());
        if (obj instanceof Float || Float.TYPE == type) {
            return new Float(-((Float) obj).floatValue());
        if (obj instanceof Short || Short.TYPE == type) {
            return new Short((short) -((Short) obj).shortValue());
        if (obj instanceof Byte || Byte.TYPE == type) {
            return new Byte((byte) -((Byte) obj).byteValue());
        Long num = (Long) coerceToNumber(obj, Long.class);
        return new Long(-num.longValue());

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat source code file:

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