/*
* Copyright (c) 2005 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.*;
final class UnaryPlusMinusExpression extends Expression {
private final Expression target;
private final boolean isMinus;
private static final Integer MINUS_ONE = new Integer(-1);
UnaryPlusMinusExpression(Expression target, boolean isMinus) {
this.target = target;
this.isMinus = isMinus;
}
TemplateModel _getAsTemplateModel(Environment env) throws TemplateException {
TemplateNumberModel targetModel = null;
try {
targetModel = (TemplateNumberModel) target.getAsTemplateModel(env);
} catch (ClassCastException cce) {
String msg = "Error " + getStartLocation();
msg += "\nExpression " + target + " is not numerical.";
throw new NonNumericalException(msg, env);
}
if (!isMinus) {
return targetModel;
}
Number n = targetModel.getAsNumber();
n = ArithmeticEngine.CONSERVATIVE_ENGINE.multiply(MINUS_ONE, n);
return new SimpleNumber(n);
}
public String getCanonicalForm() {
String op = isMinus ? "-" : "+";
return op + target.getCanonicalForm();
}
boolean isLiteral() {
return target.isLiteral();
}
Expression _deepClone(String name, Expression subst) {
return new UnaryPlusMinusExpression(target.deepClone(name, subst), isMinus);
}
}
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