org.apache.taglibs.standard.lang.jstl.ModulusOperator 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 modulus operator
*
* @author Nathan Abramson - Art Technology Group
*/
public class ModulusOperator
extends BinaryOperator {
//-------------------------------------
// Singleton
//-------------------------------------
public static final ModulusOperator SINGLETON =
new ModulusOperator();
//-------------------------------------
/**
* Constructor
*/
public ModulusOperator() {
}
//-------------------------------------
// Expression methods
//-------------------------------------
/**
* Returns the symbol representing the operator
*/
public String getOperatorSymbol() {
return "%";
}
//-------------------------------------
/**
* Applies the operator to the given value
*/
public Object apply(Object pLeft,
Object pRight,
Object pContext,
Logger pLogger)
throws ELException {
if (pLeft == null &&
pRight == null) {
if (pLogger.isLoggingWarning()) {
pLogger.logWarning
(Constants.ARITH_OP_NULL,
getOperatorSymbol());
}
return PrimitiveObjects.getInteger(0);
}
if ((pLeft != null &&
(Coercions.isFloatingPointType(pLeft) ||
Coercions.isFloatingPointString(pLeft))) ||
(pRight != null &&
(Coercions.isFloatingPointType(pRight) ||
Coercions.isFloatingPointString(pRight)))) {
double left =
Coercions.coerceToPrimitiveNumber(pLeft, Double.class, pLogger).
doubleValue();
double right =
Coercions.coerceToPrimitiveNumber(pRight, Double.class, pLogger).
doubleValue();
try {
return PrimitiveObjects.getDouble(left % right);
}
catch (Exception exc) {
if (pLogger.isLoggingError()) {
pLogger.logError
(Constants.ARITH_ERROR,
getOperatorSymbol(),
"" + left,
"" + right);
}
return PrimitiveObjects.getInteger(0);
}
} else {
long left =
Coercions.coerceToPrimitiveNumber(pLeft, Long.class, pLogger).
longValue();
long right =
Coercions.coerceToPrimitiveNumber(pRight, Long.class, pLogger).
longValue();
try {
return PrimitiveObjects.getLong(left % right);
}
catch (Exception exc) {
if (pLogger.isLoggingError()) {
pLogger.logError
(Constants.ARITH_ERROR,
getOperatorSymbol(),
"" + left,
"" + right);
}
return PrimitiveObjects.getInteger(0);
}
}
}
//-------------------------------------
}