org.projectforge.framework.xstream.converter.DateConverter.java Source code

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Here is the source code for org.projectforge.framework.xstream.converter.DateConverter.java

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/////////////////////////////////////////////////////////////////////////////
//
// Project ProjectForge Community Edition
//         www.projectforge.org
//
// Copyright (C) 2001-2014 Kai Reinhard (k.reinhard@micromata.de)
//
// ProjectForge is dual-licensed.
//
// This community edition is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 3 of the License.
//
// This community edition is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
// Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, see http://www.gnu.org/licenses/.
//
/////////////////////////////////////////////////////////////////////////////

package org.projectforge.framework.xstream.converter;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

import org.apache.commons.lang.StringUtils;
import org.projectforge.framework.persistence.user.api.ThreadLocalUserContext;
import org.projectforge.framework.xstream.XmlConstants;

public class DateConverter extends AbstractValueConverter<Date> {
    private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(DateConverter.class);

    protected static final String FORMAT_ISO_DATE = "yyyy-MM-dd";

    protected static final String FORMAT_ISO_TIMESTAMP_MINUTES = "yyyy-MM-dd HH:mm";

    protected static final String FORMAT_ISO_TIMESTAMP_SECONDS = "yyyy-MM-dd HH:mm:ss";

    protected static final String FORMAT_ISO_TIMESTAMP_MILLIS = "yyyy-MM-dd HH:mm:ss.S";

    private TimeZone timeZone;

    public DateConverter() {
    }

    /**
     * Use the given time zone instead of the time zone of the logged in user (or, if not given the default time zone of the system).
     * @param timeZone
     */
    public DateConverter(final TimeZone timeZone) {
        this.timeZone = timeZone;
    }

    @Override
    public String toString(Object obj) {
        if (obj == null) {
            return null;
        }
        return String.valueOf(((Date) obj).getTime());
    }

    @Override
    public Date fromString(String str) {
        if (StringUtils.isEmpty(str) == true || XmlConstants.NULL_IDENTIFIER.equals(str) == true) {
            return null;
        }
        String format = null;
        if (str.indexOf('-') > 0) {
            final int length = str.length();
            if (length == FORMAT_ISO_DATE.length()) {
                format = FORMAT_ISO_DATE;
            } else if (length == FORMAT_ISO_TIMESTAMP_MINUTES.length()) {
                format = FORMAT_ISO_TIMESTAMP_MINUTES;
            } else if (length == FORMAT_ISO_TIMESTAMP_SECONDS.length()) {
                format = FORMAT_ISO_TIMESTAMP_SECONDS;
            } else if (length == FORMAT_ISO_TIMESTAMP_MILLIS.length()) {
                format = FORMAT_ISO_TIMESTAMP_MILLIS;
            }
        }
        if (format != null) {
            final DateFormat dateFormat = new SimpleDateFormat(format);
            dateFormat.setTimeZone(getTimeZone());
            try {
                return dateFormat.parse(str);
            } catch (ParseException ex) {
                log.warn("Can't parse date string '" + str + "'.");
                return null;
            }
        }
        try {
            final long timeInMillis = new Long(str);
            return new Date(timeInMillis);
        } catch (final NumberFormatException ex) {
            log.warn("Can't convert value '" + str + "' to time in millis (long value).");
            return null;
        }
    }

    /**
     * The time zone of this object (if given) or the time zone of the user if found in the ThreadLocalUserContext, otherwise {@link TimeZone#getDefault()}.
     * @see ThreadLocalUserContext#getUser()
     * @see ThreadLocalUserContext#getTimeZone()
     */
    protected TimeZone getTimeZone() {
        if (timeZone != null) {
            return timeZone;
        }
        return ThreadLocalUserContext.getTimeZone();
    }
}