Support null values as shapelib does
------------------------------------

                 Key: GEOT-3204
                 URL: http://jira.codehaus.org/browse/GEOT-3204
             Project: GeoTools
          Issue Type: Improvement
          Components: data shapefile
    Affects Versions: 2.6.1
         Environment: All
            Reporter: Eric Engle
            Assignee: Andrea Aime
         Attachments: DbaseFileReader.diff

The shapefile plugin has a decent enough dbf reader included. However, it does 
not handle null values. This is not necessarily bad, since the shapefile 
standard does not discuss the dbf contents in depth, but common C libraries 
(including the one used by ogr2ogr and postgis) do handle null values. For one 
example see http://shapelib.maptools.org. This thus presents a compatibility 
problem, if not against the standard, then merely against standard practice (at 
least for our use of shapefiles.)

I have attached a patch that adds support to the dbf reader in the shapefile 
plugin in geotools 2.6.1. I would love to see this included in a future release 
of geotools, so please let me know if I can improve it in any way.

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