/**
* The contents of this file are subject to the license and copyright
* detailed in the LICENSE and NOTICE files at the root of the source
* tree and available online at
*
* http://www.dspace.org/license/
*/
package org.dspace.xoai.util;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
/**
*
* @author Lyncode Development Team (dspace at lyncode dot com)
*/
public class DateUtils
{
private static Logger log = LogManager.getLogger(DateUtils.class);
/**
* Format a Date object as a valid UTC Date String, per OAI-PMH guidelines
* http://www.openarchives.org/OAI/openarchivesprotocol.html#DatestampsResponses
*
* @param date Date object
* @return UTC date string
*/
public static String format(Date date)
{
// NOTE: OAI-PMH REQUIRES that all dates be expressed in UTC format
// as YYYY-MM-DDThh:mm:ssZ For more details, see
// http://www.openarchives.org/OAI/openarchivesprotocol.html#DatestampsResponses
SimpleDateFormat sdf = new SimpleDateFormat(
"yyyy-MM-dd'T'HH:mm:ss'Z'");
// We indicate that the returned date is in Zulu time (UTC) so we have
// to set the time zone of sdf correctly
sdf.setTimeZone(TimeZone.getTimeZone("ZULU"));
String ret = sdf.format(date);
return ret;
}
/**
* Parse a string into a Date object
* @param date string to parse
* @return Date
*/
public static Date parse(String date)
{
// First try to parse as a full UTC date/time, e.g. 2008-01-01T00:00:00Z
SimpleDateFormat format = new SimpleDateFormat(
"yyyy-MM-dd'T'HH:mm:ss'Z'");
format.setTimeZone(TimeZone.getTimeZone("ZULU"));
Date ret;
try
{
ret = format.parse(date);
return ret;
}
catch (ParseException ex)
{
// If a parse exception, try other logical date/time formats
// based on the local timezone
format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",
Locale.getDefault());
try
{
return format.parse(date);
}
catch (ParseException e1)
{
format = new SimpleDateFormat("yyyy-MM-dd",
Locale.getDefault());
try
{
return format.parse(date);
}
catch (ParseException e2)
{
format = new SimpleDateFormat("yyyy-MM",
Locale.getDefault());
try
{
return format.parse(date);
}
catch (ParseException e3)
{
format = new SimpleDateFormat("yyyy",
Locale.getDefault());
try
{
return format.parse(date);
}
catch (ParseException e4)
{
log.error(e4.getMessage(), e4);
}
}
}
}
}
return new Date();
}
public static Date parseFromSolrDate(String date)
{
SimpleDateFormat format = new SimpleDateFormat(
"yyyy-MM-dd'T'HH:mm:ss'Z'");
format.setTimeZone(TimeZone.getTimeZone("ZULU"));
Date ret;
try
{
ret = format.parse(date);
return ret;
}
catch (ParseException e)
{
log.error(e.getMessage(), e);
}
return new Date();
}
}