org.apache.taglibs.standard.lang.jstl.UnaryMinusOperator Maven / Gradle / Ivy
/*
* 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.
*/
package org.apache.taglibs.standard.lang.jstl;
/**
* The implementation of the unary minus operator
*
* @author Nathan Abramson - Art Technology Group
*/
public class UnaryMinusOperator
extends UnaryOperator {
//-------------------------------------
// Singleton
//-------------------------------------
public static final UnaryMinusOperator SINGLETON =
new UnaryMinusOperator();
//-------------------------------------
/**
* Constructor
*/
public UnaryMinusOperator() {
}
//-------------------------------------
// Expression methods
//-------------------------------------
/**
* Returns the symbol representing the operator
*/
public String getOperatorSymbol() {
return "-";
}
//-------------------------------------
/**
* Applies the operator to the given value
*/
public Object apply(Object pValue,
Object pContext,
Logger pLogger)
throws ELException {
if (pValue == null) {
/*
if (pLogger.isLoggingWarning ()) {
pLogger.logWarning
(Constants.ARITH_OP_NULL,
getOperatorSymbol ());
}
*/
return PrimitiveObjects.getInteger(0);
} else if (pValue instanceof String) {
if (Coercions.isFloatingPointString(pValue)) {
double dval =
((Number)
(Coercions.coerceToPrimitiveNumber
(pValue, Double.class, pLogger))).
doubleValue();
return PrimitiveObjects.getDouble(-dval);
} else {
long lval =
((Number)
(Coercions.coerceToPrimitiveNumber
(pValue, Long.class, pLogger))).
longValue();
return PrimitiveObjects.getLong(-lval);
}
} else if (pValue instanceof Byte) {
return PrimitiveObjects.getByte
((byte) -(((Byte) pValue).byteValue()));
} else if (pValue instanceof Short) {
return PrimitiveObjects.getShort
((short) -(((Short) pValue).shortValue()));
} else if (pValue instanceof Integer) {
return PrimitiveObjects.getInteger
((int) -(((Integer) pValue).intValue()));
} else if (pValue instanceof Long) {
return PrimitiveObjects.getLong
((long) -(((Long) pValue).longValue()));
} else if (pValue instanceof Float) {
return PrimitiveObjects.getFloat
((float) -(((Float) pValue).floatValue()));
} else if (pValue instanceof Double) {
return PrimitiveObjects.getDouble
((double) -(((Double) pValue).doubleValue()));
} else {
if (pLogger.isLoggingError()) {
pLogger.logError
(Constants.UNARY_OP_BAD_TYPE,
getOperatorSymbol(),
pValue.getClass().getName());
}
return PrimitiveObjects.getInteger(0);
}
}
//-------------------------------------
}