as far as i remember it is not possible to simply extend the
FeatureSchema of a FeatureDataSet and the set the attribute.
You need to "copy/transform" every Feature towards the new Schema and
create a new Feature and a new Feature Collection.
see for instance:
org.openjump.core.spatialAttributeOps.copyFeature(Feature feature,
FeatureSchema newSchema)
i think in the pirol package are also similar functions:
de.fho.jump.pirol.apiTools.FeatureCollectionTools
stefan
Anthony Jjumba wrote:
> I would like to add a new attribute to a schema and then start adding
> values to the added attribute however I am
>
> having problems with it.
>
>
>
> I have a shapefile from which I get:
>
>
>
> FeatureCollection allFeatures;
>
> FeatureSchema lyrSchema = allFeatures.getFeatureSchema();
>
> Iterator fIt = allFeatures.iterator();
>
>
>
> //check to see if attribute does not exist
> already
>
> if(!lyrSchema.hasAttribute("myField")){
>
> lyrSchema.addAttribute("myField",AttributeType.STRING);
>
> }
>
> //loop through all the features and add an
> attribute value in the 'myField' column
>
> while (fIt.hasNext()){
>
> Feature currFeature = (Feature)fIt.next();
>
> currFeature.setSchema(lyrSchema);
>
> String attrValue = "someText";
>
> currFeature.setAttribute("myField",attrValue); // program
> crashes here
>
> }
>
>
>
>
>
> I have checked and I am sure I can get the attribute index of the
> 'myField' attribute that has just been added.
>
> However, for some reason I am not able to add the attribute value.
>
>
>
> It gives me this error:
>
> Exception in thread "AWT-EventQueue-0"
> java.lang.ArrayIndexOutOfBoundsException: 4
>
>
>
> Any ideas or help will be appreciated.
>
> Thanks,
>
> Anthony
>
>
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