/*
* Copyright 2002-2006 The Apache Software Foundation.
*
* Licensed 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.
*/
package org.apache.commons.jexl.parser;
import java.math.BigDecimal;
import java.math.BigInteger;
import org.apache.commons.jexl.JexlContext;
/**
* - (unary minus).
*
* @author <a href="mailto:mhw@kremvax.net">Mark H. Wilkinson</a>
* @version $Id: ASTUnaryMinusNode.java 398325 2006-04-30 12:34:29Z dion $
*/
public class ASTUnaryMinusNode extends SimpleNode {
/**
* Create the node given an id.
*
* @param id node id.
*/
public ASTUnaryMinusNode(int id) {
super(id);
}
/**
* Create a node with the given parser and id.
*
* @param p a parser.
* @param id node id.
*/
public ASTUnaryMinusNode(Parser p, int id) {
super(p, id);
}
/** {@inheritDoc} */
public Object jjtAccept(ParserVisitor visitor, Object data) {
return visitor.visit(this, data);
}
/** {@inheritDoc} */
public Object value(JexlContext jc) throws Exception {
Object val = ((SimpleNode) jjtGetChild(0)).value(jc);
if (val instanceof Byte) {
byte valueAsByte = ((Byte) val).byteValue();
return new Byte((byte) -valueAsByte);
} else if (val instanceof Short) {
short valueAsShort = ((Short) val).shortValue();
return new Short((short) -valueAsShort);
} else if (val instanceof Integer) {
int valueAsInt = ((Integer) val).intValue();
return new Integer(-valueAsInt);
} else if (val instanceof Long) {
long valueAsLong = ((Long) val).longValue();
return new Long(-valueAsLong);
} else if (val instanceof Float) {
float valueAsFloat = ((Float) val).floatValue();
return new Float(-valueAsFloat);
} else if (val instanceof Double) {
double valueAsDouble = ((Double) val).doubleValue();
return new Double(-valueAsDouble);
} else if (val instanceof BigDecimal) {
BigDecimal valueAsBigD = (BigDecimal) val;
return valueAsBigD.negate();
} else if (val instanceof BigInteger) {
BigInteger valueAsBigI = (BigInteger) val;
return valueAsBigI.negate();
}
throw new Exception("expression not a number");
}
}