By the way, documentWriter.writeDocument() has similar effects.

yours

Jin

On Fri, Aug 14, 2009 at 4:07 PM, Jianhui Jin<[email protected]> wrote:
> Dear All
>
> I got "<Filter></Filter>"    (UNWANTED EMPTY FILTER) while using
> DocumentWriter.writeFragment(), don't know whether it is a bug or
> something I did wrong?
>
> I got something as:
> "
> <Filter xmlns="http://www.opengis.net/ogc";
> xmlns:gml="http://www.opengis.net/gml";><And><PropertyIsEqualTo><PropertyName>SEX</PropertyName>
> <Literal>2</Literal>
> </PropertyIsEqualTo>
> <PropertyIsEqualTo><PropertyName>ISCOMMUNAL</PropertyName>
> <Literal>-9</Literal>
> </PropertyIsEqualTo>
> <PropertyIsEqualTo><PropertyName>AGE0</PropertyName>
> <Literal>0</Literal>
> </PropertyIsEqualTo>
> </And>
> <Filter></Filter>    (UNWANTED EMPTY FILTER)
> </Filter>
> "
> using DocumentWriter.writeFragment(
>                            columnFilter,
> SchemaFactory.getInstance(org.geotools.filter.v1_0.OGC.Filter.getNamespaceURI()),
>                            printWriter,
>                            OGCSchema.getInstance().getImplementationHints());
>
> Besides, If I use Encoder..encode(columnFilter,
> org.geotools.filter.v1_0.OGC.Filter, new BufferedOutputStream(new
> FileOutputStream("C:/users/jianhui jin/work/temp.xml"))) instead, got
> exception:
> java.lang.NullPointerException
>        at 
> org.geotools.xml.impl.SchemaIndexImpl.destroy(SchemaIndexImpl.java:96)
>        at org.geotools.xml.Encoder.encode(Encoder.java:1007)
>        at org.geotools.xml.Encoder.encode(Encoder.java:557)
>
>
> Any ideas?
>
> TKS a lot
>
> Jin
>

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