Hi,
I'm new to the "geotools-world" and so far i really like it!
I'm kinda stuck on one thing though and would really appreciate your
help/hints.
Ok... i got a little mapviewer and on right-clicking on for example a
polygon, i display
the attribute table just for the 'clicked-on' polygon. that all works fine.
now... what do i
have to do if i want to change an attribute value of a shapefile? what i'm
trying to do is,
enter a new value in the displayed table and then write it to the shapefile.
i tried using
store.modifyFeatures() and a transaction, see the following code....
public void changeAttributeData(FeatureSource source, Feature f, String
attName, String newValue) throws IOException {
FeatureStore store = (FeatureStore) source;
DefaultTransaction transaction = new DefaultTransaction("test1");
store.setTransaction(transaction);
FeatureType featureType = store.getSchema();
AttributeType attributeType = featureType.getAttributeType(attName);
FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(
GeoTools.getDefaultHints() );
Filter filter = ff.id( Collections.singleton( ff.featureId(f.getID())));
try {
store.modifyFeatures( attributeType, newValue, filter );
transaction.commit();
transaction.close();
} catch(Exception e){
transaction.rollback();
transaction.close();
e.printStackTrace();
}
}
... what am i doing wrong here... as i always get an IOException saying:
java.io.IOException: Unable to delete original file:
file:/C:/shapefiles/testShapefile.shp
at
org.geotools.data.shapefile.ShapefileDataStore.copyAndDelete(ShapefileDataStore.java:1187)
at
org.geotools.data.shapefile.ShapefileDataStore$Writer.clean(ShapefileDataStore.java:1460)
at
org.geotools.data.shapefile.ShapefileDataStore$Writer.close(ShapefileDataStore.java:1526)
at
org.geotools.data.InProcessLockingManager$1.close(InProcessLockingManager.java:343)
at
org.geotools.data.FilteringFeatureWriter.close(FilteringFeatureWriter.java:148)
at
org.geotools.data.AbstractFeatureStore.modifyFeatures(AbstractFeatureStore.java:146)
at
org.geotools.data.AbstractFeatureStore.modifyFeatures(AbstractFeatureStore.java:85)
at shp.ShpData.changeAttributeData(ShpData.java:90)
...
thats thrown by the store.modifyFeatures(...) call
it seems like there is a lock on the shapefile or something? or maybe im
totaly on the wrong way in how to change the data? i would really appreciate
your help guys.
thanks
anna
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