001/*
002 * (C) Copyright 2007 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Nuxeo - initial API and implementation
016 *
017 * $Id: RelationDate.java 28460 2008-01-03 15:34:05Z sfermigier $
018 */
019
020package org.nuxeo.ecm.platform.relations.api.impl;
021
022import java.text.DateFormat;
023import java.text.ParseException;
024import java.text.SimpleDateFormat;
025import java.util.Calendar;
026import java.util.Date;
027
028import org.nuxeo.ecm.platform.relations.api.Literal;
029
030/**
031 * Relation date management.
032 *
033 * @author <a href="mailto:at@nuxeo.com">Anahide Tchertchian</a>
034 */
035public class RelationDate {
036
037    private RelationDate() {
038    }
039
040    protected static DateFormat getDateFormat() {
041        // not thread-safe so don't use a static instance
042        return new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
043    }
044
045    /**
046     * Returns Literal for given date.
047     */
048    public static Literal getLiteralDate(Date date) {
049        return new LiteralImpl(getDateFormat().format(date));
050    }
051
052    /**
053     * @return Literal for given Calendar instance
054     */
055    public static Literal getLiteralDate(Calendar cal) {
056        return getLiteralDate(cal.getTime());
057    }
058
059    /**
060     * @return Date instance for given literal.
061     */
062    public static Date getDate(Literal dateLiteral) {
063        Date date = null;
064        if (dateLiteral != null) {
065            String dateString = dateLiteral.getValue();
066            try {
067                date = getDateFormat().parse(dateString);
068            } catch (ParseException err) {
069            }
070        }
071        return date;
072    }
073
074    /**
075     * @return Calendar instance for given literal.
076     */
077    public static Calendar getCalendar(Literal dateLiteral) {
078        // TODO optim ?
079        Calendar cal = Calendar.getInstance();
080        Date date = getDate(dateLiteral);
081        if (date == null) {
082            return null;
083        }
084
085        cal.setTime(date);
086        return cal;
087    }
088
089}