/*
* Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
*
* Licensed 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 freemarker.core;
import java.util.Date;
import freemarker.template.TemplateDateModel;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;
abstract class BuiltInForDate extends BuiltIn {
TemplateModel _eval(Environment env)
throws TemplateException
{
TemplateModel model = target.eval(env);
if (model instanceof TemplateDateModel) {
TemplateDateModel tdm = (TemplateDateModel) model;
return calculateResult(EvalUtil.modelToDate(tdm, target), tdm.getDateType(), env);
} else {
throw newNonDateException(env, model, target);
}
}
/** Override this to implement the built-in. */
protected abstract TemplateModel calculateResult(
Date date, int dateType, Environment env)
throws TemplateException;
static TemplateException newNonDateException(Environment env, TemplateModel model, Expression target)
throws InvalidReferenceException {
TemplateException e;
if(model == null) {
e = InvalidReferenceException.getInstance(target, env);
} else {
e = new NonDateException(target, model, "date", env);
}
return e;
}
}