[OT] Parsing xs:dateTime values

[Christopher Schultz-2]

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All,

I posted this on the commons-user mailing list, but I'm not getting any
love. I'm cross-posting to see if anyone on this list might have any
good ideas.

| 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.

My existing implementation uses regular expressions, which seems a bit
overkill.

Thanks,
- -chris
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[Robert Koberg]

Hi,

You don't need regexp. Do you mean something like:

  private static final String ISO8601_DATEFORMAT =
"yyyy-MM-dd'T'HH:mm:ss";

  private static final java.text.SimpleDateFormat ISO8601 = new
java.text.SimpleDateFormat(
      ISO8601_DATEFORMAT, java.util.Locale.US);


  public static final Date getDateFromIso8601(final String iso8601)
throws ParseException {
    return ISO8601.parse(iso8601);
  }

best,
-Rob


On Thu, 2008-05-15 at 12:00 -0400, Christopher Schultz wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> All,
>
> I posted this on the commons-user mailing list, but I'm not getting any
> love. I'm cross-posting to see if anyone on this list might have any
> good ideas.
>
> | 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.
>
> My existing implementation uses regular expressions, which seems a bit
> overkill.
>
> Thanks,
> - -chris
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> va4AnRjfICMeUROWQGI40ts3CwZXtEOB
> =dDWw
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[DJohnson]

One cautionary observation about the use of shared SimpleDateFormat
instances:  they are not threadsafe.
While it seems like a good idea to create these for various formats and
hold them as class static or instance members, you need to do something to
prevent threading issues.
I have run into problems using SimpleDateFormat in this way in a
multiprocessor environment, which lead to using the following simple
subclass instead:

public class SynchronizedSimpleDateFormat extends SimpleDateFormat {

  public SynchronizedSimpleDateFormat() {
    super();
  }

  public SynchronizedSimpleDateFormat(String arg0) {
    super(arg0);
  }

  public SynchronizedSimpleDateFormat(String arg0, DateFormatSymbols arg1)
{
    super(arg0, arg1);
  }

  public SynchronizedSimpleDateFormat(String arg0, Locale arg1) {
    super(arg0, arg1);
  }

  // Note that we only need to synchronize this format method, as the
others all use this one internally
  public synchronized StringBuffer format(Date arg0, StringBuffer arg1,
FieldPosition arg2) {
    return super.format(arg0, arg1, arg2);
  }

  public synchronized Date parse(String arg0, ParsePosition arg1) {
    return super.parse(arg0, arg1);
  }

  public synchronized Date parse(String arg0) throws ParseException {
    return super.parse(arg0);
  }

}



Please respond to "Tomcat Users List" <users@...>

To:     Tomcat Users List <users@...>
cc:      
Subject:        Re: [OT] Parsing xs:dateTime values


Hi,

You don't need regexp. Do you mean something like:

private static final String ISO8601_DATEFORMAT =
"yyyy-MM-dd'T'HH:mm:ss";

private static final java.text.SimpleDateFormat ISO8601 = new
java.text.SimpleDateFormat(
ISO8601_DATEFORMAT, java.util.Locale.US);


public static final Date getDateFromIso8601(final String iso8601)
throws ParseException {
return ISO8601.parse(iso8601);
}

best,
-Rob


On Thu, 2008-05-15 at 12:00 -0400, Christopher Schultz wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> All,
>
> I posted this on the commons-user mailing list, but I'm not getting any
> love. I'm cross-posting to see if anyone on this list might have any
> good ideas.
>
> | 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.
>
> My existing implementation uses regular expressions, which seems a bit
> overkill.
>
> Thanks,
> - -chris
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> va4AnRjfICMeUROWQGI40ts3CwZXtEOB
> =dDWw
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[Christopher Schultz-2]

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Robert,

Robert Koberg wrote:
| You don't need regexp. Do you mean something like:
|
|   private static final String ISO8601_DATEFORMAT =
| "yyyy-MM-dd'T'HH:mm:ss";

This does not account for the milliseconds and timezone. The TX format
for xs:dateTime does not match anything that SimpleDateFormat will read,
and the fact that the ".SSS" (in simpleDateFormat-speak) is completely
optional also fouls things up.

:(

- -chris
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[Christopher Schultz-2]

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DJohnson,

DJohnson@... wrote:
| I have run into problems using SimpleDateFormat in this way in a
| multiprocessor environment, which lead to using the following simple
| subclass instead:

IMO it's better just to create DateFormat objects on the fly and discard
them. No synchronization or additional classes required.

- -chris

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[Robert Koberg]

whoops and thanks :)

On Thu, 2008-05-15 at 12:27 -0400, DJohnson@... wrote:

> One cautionary observation about the use of shared SimpleDateFormat
> instances:  they are not threadsafe.
> While it seems like a good idea to create these for various formats and
> hold them as class static or instance members, you need to do something to
> prevent threading issues.
> I have run into problems using SimpleDateFormat in this way in a
> multiprocessor environment, which lead to using the following simple
> subclass instead:
>
> public class SynchronizedSimpleDateFormat extends SimpleDateFormat {
>
>   public SynchronizedSimpleDateFormat() {
>     super();
>   }
>
>   public SynchronizedSimpleDateFormat(String arg0) {
>     super(arg0);
>   }
>
>   public SynchronizedSimpleDateFormat(String arg0, DateFormatSymbols arg1)
> {
>     super(arg0, arg1);
>   }
>
>   public SynchronizedSimpleDateFormat(String arg0, Locale arg1) {
>     super(arg0, arg1);
>   }
>
>   // Note that we only need to synchronize this format method, as the
> others all use this one internally
>   public synchronized StringBuffer format(Date arg0, StringBuffer arg1,
> FieldPosition arg2) {
>     return super.format(arg0, arg1, arg2);
>   }
>
>   public synchronized Date parse(String arg0, ParsePosition arg1) {
>     return super.parse(arg0, arg1);
>   }
>
>   public synchronized Date parse(String arg0) throws ParseException {
>     return super.parse(arg0);
>   }
>
> }
>
>
>
> Please respond to "Tomcat Users List" <users@...>
>
> To:     Tomcat Users List <users@...>
> cc:      
> Subject:        Re: [OT] Parsing xs:dateTime values
>
>
> Hi,
>
> You don't need regexp. Do you mean something like:
>
> private static final String ISO8601_DATEFORMAT =
> "yyyy-MM-dd'T'HH:mm:ss";
>
> private static final java.text.SimpleDateFormat ISO8601 = new
> java.text.SimpleDateFormat(
> ISO8601_DATEFORMAT, java.util.Locale.US);
>
>
> public static final Date getDateFromIso8601(final String iso8601)
> throws ParseException {
> return ISO8601.parse(iso8601);
> }
>
> best,
> -Rob
>
>
> On Thu, 2008-05-15 at 12:00 -0400, Christopher Schultz wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > All,
> >
> > I posted this on the commons-user mailing list, but I'm not getting any
> > love. I'm cross-posting to see if anyone on this list might have any
> > good ideas.
> >
> > | 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.
> >
> > My existing implementation uses regular expressions, which seems a bit
> > overkill.
> >
> > Thanks,
> > - -chris
> > -----BEGIN PGP SIGNATURE-----
> > Version: GnuPG v1.4.9 (MingW32)
> > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
> >
> > iEYEARECAAYFAkgsXdIACgkQ9CaO5/Lv0PAZawCffPNDLZ3bXczy89Cm1ptDzu1E
> > va4AnRjfICMeUROWQGI40ts3CwZXtEOB
> > =dDWw
> > -----END PGP SIGNATURE-----
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@...
> > To unsubscribe, e-mail: users-unsubscribe@...
> > For additional commands, e-mail: users-help@...
> >
>
>
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>
>

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