001/*
002 * (C) Copyright 2007 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 *     Nuxeo - initial API and implementation
018 *
019 * $Id: RelationDate.java 28460 2008-01-03 15:34:05Z sfermigier $
020 */
021
022package org.nuxeo.ecm.platform.relations.api.impl;
023
024import java.text.DateFormat;
025import java.text.ParseException;
026import java.text.SimpleDateFormat;
027import java.util.Calendar;
028import java.util.Date;
029
030import org.nuxeo.ecm.platform.relations.api.Literal;
031
032/**
033 * Relation date management.
034 *
035 * @author <a href="mailto:[email protected]">Anahide Tchertchian</a>
036 */
037public class RelationDate {
038
039    private RelationDate() {
040    }
041
042    protected static DateFormat getDateFormat() {
043        // not thread-safe so don't use a static instance
044        return new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
045    }
046
047    /**
048     * Returns Literal for given date.
049     */
050    public static Literal getLiteralDate(Date date) {
051        return new LiteralImpl(getDateFormat().format(date));
052    }
053
054    /**
055     * @return Literal for given Calendar instance
056     */
057    public static Literal getLiteralDate(Calendar cal) {
058        return getLiteralDate(cal.getTime());
059    }
060
061    /**
062     * @return Date instance for given literal.
063     */
064    public static Date getDate(Literal dateLiteral) {
065        Date date = null;
066        if (dateLiteral != null) {
067            String dateString = dateLiteral.getValue();
068            try {
069                date = getDateFormat().parse(dateString);
070            } catch (ParseException err) {
071            }
072        }
073        return date;
074    }
075
076    /**
077     * @return Calendar instance for given literal.
078     */
079    public static Calendar getCalendar(Literal dateLiteral) {
080        // TODO optim ?
081        Calendar cal = Calendar.getInstance();
082        Date date = getDate(dateLiteral);
083        if (date == null) {
084            return null;
085        }
086
087        cal.setTime(date);
088        return cal;
089    }
090
091}