Hi Jody,
I tried your approach and here is what happened:
- When I call the createSchema, it creates the schema but the crs is null;
- Then I call the forceSchemaCRS and it creates the .prj properly but the
schema is set to null;
- Then when I call the command: featureStore =
(FeatureStore<SimpleFeatureType, SimpleFeature>) shapeFileDataStore
.getFeatureSource(featureType.getTypeName());
it is not able to get the right type, throwing an exception:
java.io.IOException: No such type : MinhaFeature
at
org.geotools.data.shapefile.ShapefileDataStore.typeCheck(ShapefileDataStore.java:545)
at
org.geotools.data.shapefile.ShapefileDataStore.getSchema(ShapefileDataStore.java:599)
at
org.geotools.data.shapefile.ShapefileDataStore.getFeatureSource(ShapefileDataStore.java:946)
at br.pucrio.engduto.model.MyLayer.writeShapeFile(MyLayer.java:141)
Then, I tried to look at the code of ShapeFileDataStore to understand what
is going on. It seems that the problem is here:
protected String getCurrentTypeName() {
return (schema == null) ? createFeatureTypeName() : schema
.getTypeName();
}
Once the forceSchemaCRS sets the schema to null, then this method calls the
createFeatureTypeName which basically gets the filename as the featuretype.
The work around I've made was to create a class in the same package of the
ShapeFileDataStore, as in this way I was able to access the protected schema
attribute, and to set the schema to the previously created schema by the
first createSchema invocation. Now it is generating the .prj properly.
I know it is not an elegant solution, but i was not able to find a better
way. Suggestions are well come.
Here is the code:
package org.geotools.data.shapefile;
import java.io.File;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import org.geotools.feature.FeatureCollection;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
public class MyShapeFileDataStore {
public static ShapefileDataStore
createShapeFileDataStore(FeatureCollection<SimpleFeatureType, SimpleFeature>
collection, CoordinateReferenceSystem crs, File file)throws Exception{
ShapefileDataStoreFactory factory = new ShapefileDataStoreFactory();
Map<String, Serializable> create = new HashMap<String,
Serializable>();
create.put("url", file.toURI().toURL());
create.put("create spatial index", Boolean.TRUE);
ShapefileDataStore shapeFileDataStore = (ShapefileDataStore) factory
.createNewDataStore(create);
shapeFileDataStore.createSchema(collection.getSchema());
SimpleFeatureType schema = shapeFileDataStore.getSchema(); // gets
the created schema
shapeFileDataStore.forceSchemaCRS(crs); // this call is setting the
schema to null
shapeFileDataStore.schema = schema; // it sets the schema again
return shapeFileDataStore;
}
}
2009/2/4 Jody Garnett <[email protected]>
> Hey.
>
> The shapefile datastore does not seem to be writing out the prj very well.
> I know a work around - but I think you are the first person to look at why
> this problem is occurring.
>
> After calling:
>
> shapefileDataStore.createSchema(collection.getSchema());
>
> You can force the prj file to be written:
> shapefile.|*forceSchemaCRS
> <../../../../org/geotools/data/shapefile/ShapefileDataStore.html#forceSchemaCRS%28org.opengis.referencing.crs.CoordinateReferenceSystem%29>*(crs)|
>
> This workaround has been present in the CSV2Shp Lab for a while :
> - http://docs.codehaus.org/display/GEOTDOC/06+CSV2SHP+Lab
>
> Jody
>
> Rodrigo Paes wrote:
>
>>
>> Hello,
>>
>>
>> I'm trying to save a shapefile from a MemoryDataStore.
>>
>> The shapefile seems to be ok, however it is not saving the .prj file
>> properly, when I open it, it is empty (0 bytes).
>>
>>
>> When I call the createSchema(), I'm getting the following warning: "PRJ
>> file not generated for null CoordinateReferenceSystem". Then I tried some
>> debugging and I have found out that this piece of code found in class
>> ShapeFileDataStore.java is throwing an exception:
>>
>> *if* (cs != *null*) {
>>
>> *try* {
>>
>> transformedBounds = env.transform(cs, *true*); <<-
>> exception happens here
>>
>> } *catch* (Exception e) {
>> cs = null;
>> transformedBounds = env;
>> }
>>
>>
>> Please, help.
>>
>>
>>
>> This is the message of the exception that is being caught in the
>> ShapeFileDataStore.java:
>>
>> org.geotools.referencing.operation.projection.ProjectionException: The
>> transform result may be 111.319,871 meters away from the expected position.
>> Are you sure that the input coordinates are inside this map projection area
>> of validity? The point is located 0°00.0'E away from the central meridian
>> and 90°00.0'S away from the latitude of origin. The projection is
>> "Transverse_Mercator"
>>
>>
>>
>> This is a println of the CRS of my GeometryDescriptor:
>>
>>
>> PROJCS["SAD_1969_UTM_Zone_23S",
>>
>> GEOGCS["GCS_South_American_1969",
>>
>> DATUM["D_South_American_1969",
>>
>> SPHEROID["GRS_1967_Truncated", 6378160.0, 298.25]],
>>
>> PRIMEM["Greenwich", 0.0],
>>
>> UNIT["degree", 0.017453292519943295],
>>
>> AXIS["Longitude", EAST],
>>
>> AXIS["Latitude", NORTH]],
>>
>> PROJECTION["Transverse_Mercator"],
>>
>> PARAMETER["central_meridian", -45.0],
>>
>> PARAMETER["latitude_of_origin", 0.0],
>>
>> PARAMETER["scale_factor", 0.9996],
>>
>> PARAMETER["false_easting", 500000.0],
>>
>> PARAMETER["false_northing", 10000000.0],
>>
>> UNIT["m", 1.0],
>>
>> AXIS["x", EAST],
>>
>> AXIS["y", NORTH]]
>>
>>
>>
>> This is the code:
>>
>>
>> FeatureSource<SimpleFeatureType, SimpleFeature> memoryFeatureSource =
>> getFeatureSource();
>>
>> SimpleFeatureType featureType =
>> memoryFeatureSource.getSchema();
>>
>>
>> File file = *new* File(getFileName());
>>
>> Map map = Collections./singletonMap/("url",
>> file.toURI().toURL());
>>
>> FileDataStoreFactorySpi factory = *new*
>> ShapefileDataStoreFactory();
>>
>> ShapefileDataStore shapeFileDataStore = (ShapefileDataStore)
>> factory
>>
>> .createNewDataStore(map);
>>
>>
>> shapeFileDataStore.createSchema(featureType);
>>
>> FeatureStore shapeFileFeatureStore = (FeatureStore) shapeFileDataStore
>>
>>
>> .getFeatureSource(featureType.getName());
>>
>>
>> Transaction t = new DefaultTransaction();
>>
>> try {
>>
>> Map features =
>> memory.getFeatures(featureType.getTypeName());
>>
>> FeatureCollection collection =
>> FeatureCollections.newCollection();
>>
>> collection.addAll(features.values());
>>
>>
>> shapeFileFeatureStore.addFeatures(collection);
>>
>> t.commit(); // write it out
>>
>> } catch (IOException eek) {
>>
>> eek.printStackTrace();
>>
>> try {
>>
>> t.rollback();
>>
>> } catch (IOException doubleEeek) {
>>
>> // rollback failed?
>>
>> }
>>
>> } finally {
>>
>> t.close();
>>
>> }
>>
>> ------------------------------------------------------------------------
>>
>>
>> ------------------------------------------------------------------------------
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>>
>
>
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