001/* 
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     stan
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.platform.rendering.fm.extensions;
023
024import java.text.DateFormat;
025import java.util.Date;
026import java.util.List;
027import java.util.Locale;
028
029import freemarker.template.SimpleDate;
030import freemarker.template.SimpleScalar;
031import freemarker.template.TemplateMethodModelEx;
032import freemarker.template.TemplateModelException;
033
034/**
035 * Format a date with the specified locale.
036 *
037 * @author <a href="mailto:[email protected]">Sun Seng David TAN</a>
038 */
039public class FormatDate implements TemplateMethodModelEx {
040
041    public Object exec(List arguments) throws TemplateModelException {
042        if (arguments.size() != 2) {
043            throw new TemplateModelException(
044                    "Invalid number of arguments for formatDate(Date date, String locale) method");
045        }
046        if (!(arguments.get(0) instanceof SimpleDate && arguments.get(1) instanceof SimpleScalar)) {
047            throw new TemplateModelException(
048                    "Invalid arguments format for the method formatDate : expecting (Date date, String local).");
049        }
050        SimpleScalar scalar = (SimpleScalar) arguments.get(1);
051        if (scalar == null) {
052            throw new TemplateModelException("the argument local is not defined");
053        }
054
055        SimpleDate simpledate = (SimpleDate) arguments.get(0);
056        if (simpledate == null) {
057            throw new TemplateModelException("the argument date is not defined");
058        }
059
060        Date date = simpledate.getAsDate();
061
062        Locale locale = new Locale(scalar.getAsString());
063
064        DateFormat df = DateFormat.getDateInstance(DateFormat.LONG, locale);
065
066        return new SimpleScalar(df.format(date));
067    }
068
069}