Next you need to grab a FeatureStore and called addFeatures; there is an
example of this kind of thing in the user guide. And we can add your
example here when we are done with it....
>> Hello, I am wondering if there is a simple way of saving a FeatureSource
>> to a
>> shapefile. The FeatureSource is backed by an MStore. I can't quite see
>> how to do this. I've gotten as far as this:
>>
>> FeatureSource fs = mapLayer.getFeatureSource(); //pre-existing
>> featursource
>> FileDataStoreFactorySpi factory = new IndexedShapefileDataStoreFactory();
>> Map map = Collections.singletonMap( "url", file.toURL()); //file from
>> chooser
>> DataStore myData = factory.createNewDataStore( map );
>> myData.createSchema(fs.getSchema());
>
>String typeName = myData.getTypeNames[0];
>FeatureStore featureStore = (FeatureStore) myData.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();
>}
>
>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 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();
}
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:
FeatureSource fs = ml.getFeatureSource();
FeatureType ft = fs.getSchema();
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();
Feature feature;
try
{
while(iterator.hasNext())
{
feature = (Feature) 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 {
transaction.close();
fc.close(iterator);
}
} catch (Exception e) {
}
--
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