/*
* 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 java.util.Date;
import freemarker.template.*;
/**
* @version 1.0
* @author Attila Szegedi
*/
class EvaluationUtil
{
private EvaluationUtil()
{
}
static String getString(TemplateScalarModel model, Expression expr, Environment env)
throws
TemplateException
{
String value = model.getAsString();
if(value == null)
{
if(env.isClassicCompatible())
{
return "";
}
else
{
throw new TemplateException(expr + " evaluated to null string.", env);
}
}
return value;
}
static Number getNumber(Expression expr, Environment env)
throws
TemplateException
{
TemplateModel model = expr.getAsTemplateModel(env);
return getNumber(model, expr, env);
}
static Number getNumber(TemplateModel model, Expression expr, Environment env)
throws
TemplateException
{
if(model instanceof TemplateNumberModel)
{
return getNumber((TemplateNumberModel)model, expr, env);
}
else if(model == null) {
throw new InvalidReferenceException(expr + " is undefined.", env);
}
else
{
throw new NonNumericalException(expr + " is not a number, it is " + model.getClass().getName(), env);
}
}
static Number getNumber(TemplateNumberModel model, Expression expr, Environment env)
throws TemplateModelException, TemplateException
{
Number value = model.getAsNumber();
if(value == null) {
throw new TemplateException(expr + " evaluated to null number.", env);
}
return value;
}
static Date getDate(TemplateDateModel model, Expression expr, Environment env)
throws TemplateModelException, TemplateException
{
Date value = model.getAsDate();
if(value == null) {
throw new TemplateException(expr + " evaluated to null date.", env);
}
return value;
}
}
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