Hi all,
I'm getting the following error when I try to modify features in a
shapefile I've created:
Exception in thread "main" java.io.IOException: No feature available
to write
at org.geotools.data.DiffFeatureWriter.write(DiffFeatureWriter.java:
168)
at org.geotools.data.InProcessLockingManager
$1.write(InProcessLockingManager.java:330)
at
org
.cecs
.shapefileTools.ShapefileRandomiser.randomise(ShapefileRandomiser.java:
86)
at
org
.cecs.shapefileTools.ShapefileRandomiser.main(ShapefileRandomiser.java:
22)
I've had a look through the source for DiffFeatureWriter, and I can't
understand the meaning of the comments - it looks like it is supposed
to refuse to write any features - is this correct?
My code is heavily based on example 5 in the docs, and the relevant
bit is attached below.
So my question is what do I need to do to modify features and write
them out. The slightly wider context is that I'm creating copies of
shapefiles with randomised attributes based on the distributions in
the original shapefile for anonymisation.
Thanks very much,
Dave Murray-Rust
---------------------------------
DataStore data = getDataStore( filename );
String typeName = data.getTypeNames()[0];
FeatureCollection collection = getFeatureCollection( data );
<snip>
DataStore newData = createDataStore( "data/output.shp" );
newData.createSchema( collection.getSchema() );
Transaction transaction = new DefaultTransaction();
FeatureStore newStore =
(FeatureStore)newData.getFeatureSource( typeName );
features = getFeatures( data );
newStore.setTransaction( transaction );
try{
newStore.addFeatures( collection );
transaction.commit();
}catch( Exception e )
{
e.printStackTrace();
transaction.rollback();
}
FeatureWriter writer = newData.getFeatureWriter( typeName,
transaction );
int i = 0;
System.out.println( "Got " +
newData.getFeatureSource( typeName ).getFeatures().size() + " features
" );
while( writer.hasNext() )
{
i++;
SimpleFeature f = (SimpleFeature)writer.next();
System.out.println( "feature " + i );
for( String prop : properties)
{
try
{
Object newVal = freqs.sample( prop );
System.out.println( "Setting " + prop +
" to " + newVal );
f.setAttribute( prop, freqs.sample(
prop ) );
transaction.commit();
writer.write();
} catch (IllegalAttributeException e)
{
System.err.println( "Could not set
feature " + prop );
e.printStackTrace();
transaction.rollback();
}
}
}
transaction.commit();
transaction.close();
writer.close();
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