Good work!
Updating the page with your example here:
- http://docs.codehaus.org/display/GEOTDOC/11+Exporting+to+A+Shapefile
>> Give that a go (in case I got something wrong) and send me back the
>> completed code example so I can dump it in the user guide :-)
>>
> It works! I tried to do the same thing with one difference:
>
> String typeName = fs.getSchema().getTypeName();
> FeatureStore featureStore = (FeatureStore) myData.getFeatureSource(
> typeName );
>
I am confused? Oh wait I get it ... the reason I did not do this is
because sometimes the typeName will
be different (often for a shapefile it is the same as the filename - no
matter what you asked for!).
> I assumed since I was using the same schema the type name would be the
> same....Humm....
>
> Anyways, here's the full final code, including the writing to a file part:
>
> FeatureSource fs = ml.getFeatureSource(); //existing map layer (in
> memory data store)
> FeatureType ft = fs.getSchema();
> try
> {
>
> IndexedShapefileDataStore dataStore = new
> IndexedShapefileDataStore(f.toURI().toURL());
> dataStore.createSchema(ft);
> dataStore.forceSchemaCRS(currentCRS);
>
>
> String typeName = dataStore.getTypeNames()[0];
> FeatureStore featureStore = (FeatureStore)
> dataStore.getFeatureSource(typeName );
> Transaction t = new DefaultTransaction();
> try {
> FeatureCollection collection = fs.getFeatures(); // grab all
> features
> featureStore.addFeatures( collection );
> t.commit(); // write it out
> } catch( IOException eek){
> //eek.printStrackTrace();
> try {
> t.rollback();
> } catch( IOException doubleEeek ){
> // rollback failed?
> }
>
> } finally {
> t.close();
> }
>
Cool.
So what is the following? It looks scary with a commit after each call
to write() ?
> DefaultTransaction transaction = new DefaultTransaction("test");
> FeatureWriter aWriter = dataStore.getFeatureWriter(transaction);
> try
> {
> while(aWriter.hasNext())
> {
> aWriter.next();
> aWriter.write();
> transaction.commit();
> }
> } catch (Exception e) {
> transaction.rollback();
> logMessage(Constants.ERROR, e.getMessage());
> } finally {
> transaction.close();
> }
> } catch (Exception e) {
> }
>
>
> Finally note that since my goal was writing the data to a file, I was able
> to bypass the stumbling block of the FeatureSource this way:
>
See comment inline!
> FeatureSource fs = ml.getFeatureSource();
> FeatureType ft = fs.getSchema();
>
CoordinateReferenceSystem currentCRS =
ft.getDefaultGeometry().getCoordinateReferenceSystem();
> String ftName = ft.getTypeName();
> logMessage(Constants.INFO, "ftname " + ftName);
> try
> {
> logMessage(Constants.INFO, "instantiate datastore");
> IndexedShapefileDataStore dataStore = new
> IndexedShapefileDataStore(f.toURI().toURL());
> dataStore.createSchema(ft);
> dataStore.forceSchemaCRS(currentCRS);
> DefaultTransaction transaction = new DefaultTransaction("test");
> FeatureWriter aWriter = dataStore.getFeatureWriter(transaction);
> FeatureCollection fc = fs.getFeatures();
> Iterator iterator = fc.iterator();
> SimpleFeature feature;
> try
> {
> while(iterator.hasNext())
> {
> feature = (SimpleFeature) iterator.next();
> SimpleFeature aNewFeature = (SimpleFeature)aWriter.next();
> aNewFeature.setAttributes(feature.getAttributes(null));
> aWriter.write();
> transaction.commit();
> }
> } catch (Exception e) {
> transaction.rollback();
> logMessage(Constants.ERROR, e.getMessage());
> } finally {
> fc.close(iterator); // close iterator first
> transaction.close();
> }
> } catch (Exception e) {
>
> }
>
I did not know you could do: feature.getAttributes( null ) - suppose
that represents the lack of an xpath expression?
I expected you to use feature.getAttributes().
Thanks for the great code example; please review the page to make sure I
did not kill anything important.
Jody
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