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Re: NullPointerException during aggregation

Hi Jon, sorry its taken so long to reply:

regExp should work, it looks like you need regExp="NATL.*" or something (I 
never remember regexp expressions for more than 24 hours), as it is, it will only match a 
file named NATL.

Ill try to deal more greacefully with the error.

Jon Blower wrote:

Hi,

As a follow-up question, should it be possible to use the regExp
option in the <scan> element to only attempt to match filenames that
match a given regular expression?  I tried to do this with the example
below, i.e.:

<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
  <aggregation dimName="time" type="joinNew">
    <variableAgg name="temperature"/>
    <variableAgg name="salinity"/>
    <scan location="/path/to/files/" suffix=".nc" regExp="NATL"
dateFormatMark="NATL_1_#ddMMyyyy" />
  </aggregation>
</netcdf>

but it gave a different NullPointerException (in
AggregationNew.java:51, version 2.2.17), which seems to be because the
aggregation is not picking up any files at all.  Should regexps work
with joinNew?

Thanks, Jon


On 07/11/06, Jon Blower <address@hidden> wrote:


Hi John,

Yes, this problem is still evident in 2.2.17 (I downloaded the
toolsUI-2.2.17.jar file).

Thanks, Jon

On 03/11/06, John Caron <address@hidden> wrote:
> Hi Jon:
>
> Can you check if you get the same error in the latest 2.2.17 release?
> I have fixed some bugs in aggregation, but im not sure if thats one of them. 
>
> thanks
>
> Jon Blower wrote:
> > Hi all,
> >
> > I'm having problems working with NcML aggregations and the 2.2.16
> > version of the Java NetCDF libraries.  I would like to aggregate
> > files:
> >
> > NATL_1_28082006.nc
> > NATL_1_29082006.nc
> > NATL_1_30082006.nc
> > ...
> >
> > along the time dimension.  I tried an NcML file like this:
> >
> > <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> 
> >   <aggregation dimName="time" type="joinNew">
> >     <variableAgg name="temperature"/>
> >     <variableAgg name="salinity"/>
> >     <scan location="/path/to/files/" suffix=".nc"
> > dateFormatMark="NATL_1_#ddMMyyyy" />
> >   </aggregation>
> > </netcdf>
> >
> > This gave me a NullPointerException:
> >
> > java.lang.NullPointerException
> >     java.util.Calendar.setTime(Calendar.java:1032)
> >     java.text.SimpleDateFormat.format(SimpleDateFormat.java:785)
> >     java.text.SimpleDateFormat.format(SimpleDateFormat.java:778)
> >     java.text.DateFormat.format(DateFormat.java:314)
> > ucar.nc2.units.DateFormatter.toDateTimeStringISO(DateFormatter.java:184) 
> >
> >     ucar.nc2.ncml.Aggregation.crawlDirectory(Aggregation.java:817)
> >
> > I think I know why this is.  There are other files in the same
> > directory of the form "NATL_120_28082006.nc" and I think the
> > aggregator is trying to match these.  Can I arrange it so that only
> > files that match the pattern "NATL_1_#ddMMyyyy.nc" are aggregated, and 
> > all others are simply ignored?
> >
> > I am reluctant to change the directory structure of my data because
> > other applications may depend on it.
> >
> > Thanks in advance,
> > Jon
> >
>
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