Tomcat example source code file (AstNegative.java)

This example Tomcat source code file (AstNegative.java) is included in the DevDaily.com "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 AstNegative.java 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
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/* Generated By:JJTree: Do not edit this line. AstNegative.java */

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 [jacob@hookom.net]
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: markt $
 */
public final class AstNegative extends SimpleNode {
    public AstNegative(int id) {
        super(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());
    }
}