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All,
Christopher Schultz wrote:
| Hi, I'm looking for an implementation of a String->Date converter for
| xs:dateTime, which has an odd format. It's not directly supportable by
| java.text.SimpleDateFormat and looks like a regular expression is the
| only way to go.
|
| Does anyone have an implementation they'd care to share, or any tips in
| particular? I'd be glad to share whatever I come up with if there isn't
| anything already out there.
As I received no useful replies, I'll assume that there is still a need
for such capability. Here is the implementation that I developed. Oddly,
it seems that sometimes the TimeZone is incorrectly set (though the
normalized time appears to be correct) in the resulting Date. Any tips
would be appreciated.
Apologies for the poor formatting.
======================
public class XMLDateConverter
~ implements Converter
{
~ private Converter _default;
~ public XMLDateConverter(Converter defaultConverter)
~ {
~ _default = defaultConverter;
~ }
~ public Object convert(Class type, Object value)
~ throws ConversionException
~ {
~ if(type.isAssignableFrom(Date.class)
~ && value instanceof String)
~ {
~ try
~ {
~ return parseXMLDateTime((String)value);
~ }
~ catch (ParseException pe)
~ {
~ throw new ConversionException("Cannot parse date", pe);
~ }
~ }
~ else if(null != _default)
~ {
~ return _default.convert(type, value);
~ }
~ else
~ {
~ throw new ConversionException("Don't know how to convert
" + value + " (" + (null == value ? "null" : value.getClass().getName())
+ ") to " + type.getName());
~ }
~ }
~ private static final Pattern XS_DATETIME_PATTERN =
Pattern.compile("([-]?[0-
9]{4,})-([0-9]{2})-([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(.([0-9]{1,3}))?((
?:[+-]?[0-9]{2}:[0-9]{2})|Z)?");
~ private static Date parseXMLDateTime_regexp(String dateTime)
~ throws ParseException
~ {
~ Matcher m = XS_DATETIME_PATTERN.matcher(dateTime);
~ if(!m.matches())
~ throw new ParseException("Unparsable date: " + dateTime, -1);
~ Calendar date = Calendar.getInstance();
~ date.set(Calendar.YEAR, Integer.parseInt(m.group(1)));
~ date.set(Calendar.MONTH, Integer.parseInt(m.group(2)) - 1); //
Stupid!
~ date.set(Calendar.DATE, Integer.parseInt(m.group(3)));
~ date.set(Calendar.HOUR_OF_DAY, Integer.parseInt(m.group(4)));
~ date.set(Calendar.MINUTE, Integer.parseInt(m.group(5)));
~ date.set(Calendar.SECOND, Integer.parseInt(m.group(6)));
~ if(null == m.group(7))
~ date.set(Calendar.MILLISECOND, 0);
~ else
~ date.set(Calendar.MILLISECOND, Integer.parseInt(m.group(8)));
~ int zoneOffset;
~ String timezone = m.group(9);
~ if(null == timezone
~ || "Z".equals(timezone))
~ {
~ zoneOffset = 0;
~ }
~ else
~ {
~ int pos = timezone.indexOf(':');
~ zoneOffset = ((60 * Integer.parseInt(timezone.substring(1,
pos)))
~ + Integer.parseInt(timezone.substring(pos + 1)))
~ * 60 * 1000
~ ;
~ if(timezone.startsWith("-"))
~ zoneOffset = -zoneOffset;
~ }
~ date.set(Calendar.ZONE_OFFSET, zoneOffset);
~ return date.getTime();
~ }
}
- -chris
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