/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.core;
import freemarker.template.*;
/**
* An operator for arithmetic operations. Note that the + operator
* also does string concatenation for backward compatibility.
* @author <a href="mailto:[email protected]">Jonathan Revusky</a>
*/
final class ArithmeticExpression extends Expression {
static final int SUBSTRACTION = 0;
static final int MULTIPLICATION = 1;
static final int DIVISION = 2;
static final int MODULUS = 3;
private static final char[] OPERATORS = new char[] {'-','*','/','%'};
private final Expression left;
private final Expression right;
private final int operation;
ArithmeticExpression(Expression left, Expression right, int operation) {
this.left = left;
this.right = right;
this.operation = operation;
}
TemplateModel _getAsTemplateModel(Environment env) throws TemplateException
{
TemplateModel leftModel = left.getAsTemplateModel(env);
TemplateModel rightModel = right.getAsTemplateModel(env);
boolean leftIsNumber = (leftModel instanceof TemplateNumberModel);
boolean rightIsNumber = (rightModel instanceof TemplateNumberModel);
boolean bothNumbers = leftIsNumber && rightIsNumber;
if (!bothNumbers) {
String msg = "Error " + getStartLocation();
if (!leftIsNumber) {
msg += "\nExpression " + left + " is not numerical";
}
if (!rightIsNumber) {
msg += "\nExpression " + right + " is not numerical";
}
throw new NonNumericalException(msg, env);
}
Number first = EvaluationUtil.getNumber(leftModel, left, env);
Number second = EvaluationUtil.getNumber(rightModel, right, env);
ArithmeticEngine ae =
env != null
? env.getArithmeticEngine()
: getTemplate().getArithmeticEngine();
switch (operation) {
case SUBSTRACTION :
return new SimpleNumber(ae.subtract(first, second));
case MULTIPLICATION :
return new SimpleNumber(ae.multiply(first, second));
case DIVISION :
return new SimpleNumber(ae.divide(first, second));
case MODULUS :
return new SimpleNumber(ae.modulus(first, second));
default:
throw new TemplateException("unknown operation : " + operation, env);
}
}
public String getCanonicalForm() {
return left.getCanonicalForm() + ' ' + OPERATORS[operation] + ' ' + right.getCanonicalForm();
}
boolean isLiteral() {
return constantValue != null || (left.isLiteral() && right.isLiteral());
}
Expression _deepClone(String name, Expression subst) {
return new ArithmeticExpression(left.deepClone(name, subst), right.deepClone(name, subst), operation);
}
}
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