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20040211: IDV and v5d file

>From: Tom Whittaker <address@hidden>
>Organization: SSEC
>Keywords: 200402111527.i1BFRQp1019091

Tom-

>When I try to get this file:
>
>http://cimss.ssec.wisc.edu/model/daily/cras00.v5d
>
>as a URL of type Vis5D, I get the follow exception.  

Well, if it doesn't work, don't do that. ;-)

>If I download the file 
>and read it locally, it reads and displays just fine.

Do this instead. ;-)

The problem is that the V5DStruct uses a RandomAccessFile which
won't work on a remote file.  It might be possible to use the
HTTPRandomAccessFile like netCDF does, but that would involve
a change to the visad.data.Vis5DForm package.

>Contained exception:null
>java.lang.NullPointerException
>       at ucar.unidata.data.grid.GridUtil.isSequence(GridUtil.java:270)
>       at ucar.unidata.data.grid.GridUtil.isTimeSequence(GridUtil.java:286)
>       at 
>ucar.unidata.data.grid.Vis5DDataSource.doMakeDataChoices(Vis5DDataSource.java:
> 141)
>       at ucar.unidata.data.DataSourceImpl.getDataChoices(DataSourceImpl.java:
> 781)
>       at ucar.unidata.data.DataManager.createDataSource(DataManager.java:799)
>       at 
>ucar.unidata.idv.IntegratedDataViewer.createDataSource(IntegratedDataViewer.ja
> va:1381)
>       at 
>ucar.unidata.idv.IntegratedDataViewer.makeDataSource(IntegratedDataViewer.java
> :1327)
>       at 
>ucar.unidata.idv.IntegratedDataViewer.handleAction(IntegratedDataViewer.java:1
> 163)
>       at 
>ucar.unidata.idv.IntegratedDataViewer.handleAction(IntegratedDataViewer.java:1
> 128)
>       at ucar.unidata.idv.chooser.UrlChooser.loadURLInner(UrlChooser.java:150
> )
>       at ucar.unidata.idv.chooser.UrlChooser.loadURL(UrlChooser.java:126)
>         at ucar.unidata.idv.chooser.UrlChooser.access$000(UrlChooser.java:71)
>       at ucar.unidata.idv.chooser.UrlChooser$1.run(UrlChooser.java:169)
>       at ucar.unidata.util.Misc$1.run(Misc.java:1281)
>
>Exception thrown at:
>Error creating data source:file.vis5d 
>with:http://cimss.ssec.wisc.edu/model/daily/cras00.v5d
>
>ucar.unidata.data.BadDataException: Error creating data source:file.vis5d 
>with:http://cimss.ssec.wisc.edu/model/daily/cras00.v5d
>java.lang.NullPointerException
>       at ucar.unidata.data.DataManager.createDataSource(DataManager.java:829)
>       at 
>ucar.unidata.idv.IntegratedDataViewer.createDataSource(IntegratedDataViewer.ja
> va:1381)
>       at 
>ucar.unidata.idv.IntegratedDataViewer.makeDataSource(IntegratedDataViewer.java
> :1327)
>       at 
>ucar.unidata.idv.IntegratedDataViewer.handleAction(IntegratedDataViewer.java:1
> 163)
>       at 
>ucar.unidata.idv.IntegratedDataViewer.handleAction(IntegratedDataViewer.java:1
> 128)
>       at ucar.unidata.idv.chooser.UrlChooser.loadURLInner(UrlChooser.java:150
> )
>       at ucar.unidata.idv.chooser.UrlChooser.loadURL(UrlChooser.java:126)
>       at ucar.unidata.idv.chooser.UrlChooser.access$000(UrlChooser.java:71)
>       at ucar.unidata.idv.chooser.UrlChooser$1.run(UrlChooser.java:169)
>       at ucar.unidata.util.Misc$1.run(Misc.java:1281)

Would you like a better error message?

Don Murray