Examples of FeatureWriter

org.geotools.data.FeatureWriter
Provides the ability to write Features information.
Capabilities:
- Similar API to FeatureReader
- After aquiring a feature using next() you may call remove() or after modification write(). If you do not call one of these two methods before calling hasNext(), or next() for that matter, the feature will be left unmodified.
- This API allows modification, and Filter based modification to be written. Please see AbstractDataStore for examples of implementing common opperations using this API.
- In order to add new Features, FeatureWriters capable of accepting new content allow next() to be called when hasNext() is false to allow new feature creation. These changes
One thing that is really nice about the approach to adding content is that the generation of FID is not left in the users control.
@author Ian Schneider @author Jody Garnett, Refractions Research @source $URL$ @version $Id$

Examples of org.geotools.data.FeatureWriter

    public void testUpdate() throws Exception {
        if (!isGeographySupportAvailable()) {
            return;
        }


        FeatureWriter fw = dataStore.getFeatureWriter(tname("geopoint"), Transaction.AUTO_COMMIT);


        Point p = gf.createPoint(new Coordinate(1, 1));


        assertTrue(fw.hasNext());
        while (fw.hasNext()) {
            SimpleFeature f = (SimpleFeature) fw.next();
            f.setDefaultGeometry(p);
            fw.write();
        }
        fw.close();


        FeatureReader fr = dataStore.getFeatureReader(new Query(tname("geopoint")),
                Transaction.AUTO_COMMIT);
        while (fr.hasNext()) {
            SimpleFeature f = (SimpleFeature) fr.next();

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Examples of org.geotools.data.FeatureWriter

    public void testAppend() throws Exception {
        if (!isGeographySupportAvailable()) {
            return;
        }


        FeatureWriter fw = dataStore.getFeatureWriterAppend(tname("geopoint"),
                Transaction.AUTO_COMMIT);


        assertFalse(fw.hasNext());
        SimpleFeature f = (SimpleFeature) fw.next();


        Point point = gf.createPoint(new Coordinate(10, 10));
        f.setAttribute("name", "append");
        f.setDefaultGeometry(point);


        fw.write();
        fw.close();


        Filter filter = ff.equals(ff.property("name"), ff.literal("append"));
        Query q = new Query(tname("geopoint"), filter);


        FeatureReader fr = dataStore.getFeatureReader(q, Transaction.AUTO_COMMIT);

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Examples of org.geotools.data.FeatureWriter

        // -- Distance calculation using GEOGRAPHY (122.2km)
        // SELECT ST_Distance('LINESTRING(-122.33 47.606, 0.0 51.5)'::geography, 'POINT(-21.96
        // 64.15)':: geography);


        // adding Reykjavik
        FeatureWriter fw = dataStore.getFeatureWriterAppend(tname("geopoint"),
                Transaction.AUTO_COMMIT);
        SimpleFeature f = (SimpleFeature) fw.next();
        Point point = gf.createPoint(new Coordinate(-21.96, 64.15));
        f.setAttribute("name", "Reykjavik");
        f.setDefaultGeometry(point);
        fw.write();
        fw.close();


        // testing distance filter
        LineString line = gf.createLineString(new Coordinate[] { new Coordinate(-122.33, 47.606),
                new Coordinate(0.0, 51.5) });
        DWithin filter = ff.dwithin(ff.property(aname("geo")), ff.literal(line), 130000d, "metre");

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Examples of org.geotools.data.FeatureWriter

    public void write() throws IOException {
        writer.write();
    }
    
    public void close() throws IOException {
        FeatureWriter w = writer;
        while( w instanceof DelegatingFeatureWriter ) {
            if ( w instanceof JDBCFeatureReader ) {
                break;
            }

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Examples of org.geotools.data.FeatureWriter

    }


    public void testWrite() throws Exception {
        int count = dataStore.getFeatureSource(tname("udt")).getCount(Query.ALL);
        
        FeatureWriter w = dataStore.getFeatureWriterAppend(tname("udt"), Transaction.AUTO_COMMIT);
        w.hasNext();
        
        SimpleFeature f = (SimpleFeature) w.next();
        f.setAttribute(aname("ut"), "abcd");
        try {
            w.write();
            fail("Write should have failed with UDT constraint failure");
        }
        catch(Exception e) {
        }
        
        f.setAttribute(aname("ut"), "34cd");
        w.write();
        w.close();
        
        assertEquals(count+1, dataStore.getFeatureSource(tname("udt")).getCount(Query.ALL));
    }

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Examples of org.geotools.data.FeatureWriter

        dataStore.createSchema(zipCodeSchema);
        assertFeatureTypesEqual(zipCodeSchema, dataStore.getSchema(tname(ZIPCODE)));
    }
    
    public void testWriteFeatures() throws Exception {
        FeatureWriter fw = dataStore.getFeatureWriterAppend(tname(PERSON),Transaction.AUTO_COMMIT);
        
        SimpleFeature f = (SimpleFeature) fw.next();
        f.setAttribute(aname("name"), "Joe");
        f.setAttribute(aname("age"), 27 );
        fw.write();
        fw.close();
        
        FeatureCollection fc = dataStore.getFeatureSource(tname(PERSON)).getFeatures();
        assertEquals(3, fc.size());
    }

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Examples of org.geotools.data.FeatureWriter

     * @return Iterator, should be closed closeIterator 
     */
    protected Iterator<SimpleFeature> openIterator() throws IOException
    {      
      try {
          FeatureWriter writer = writer();
          if(writer != null) {
              return new FeatureWriterIterator( writer() );
          }
        } catch (IOException badWriter) {
            return new NoContentIterator( badWriter );

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Examples of org.geotools.data.FeatureWriter

    public boolean addAll(Collection collection) {
        if( collection instanceof FeatureCollection ){
            return addAll( (FeatureCollection<?,?>) collection );
        }
        try {
            FeatureWriter writer = writer();
            if(writer == null) {
                return false;
            }
            try {
                // skip to end
                 while( writer.hasNext() ){
                    Feature feature = writer.next();
                }
                for( Object obj : collection ){
                    if( obj instanceof SimpleFeature){
                        SimpleFeature copy = (SimpleFeature) obj;
                        SimpleFeature feature = (SimpleFeature) writer.next();
                        
                        feature.setAttributes( copy.getAttributes() );
                        writer.write();
                    }
                }
            }
            finally {
                if( writer != null ) writer.close();
            }
            return true;
        }
        catch( IOException ignore ){
            return false;

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Examples of org.geotools.data.FeatureWriter


        String typeName = sds.getTypeNames()[0];
        int idx = loadFeatures(sds, typeName).size();


        while (idx > 0) {
            FeatureWriter writer = null;


            try {
                writer = sds.getFeatureWriter(typeName, Filter.INCLUDE, Transaction.AUTO_COMMIT);
                writer.next();
                writer.remove();
            } finally {
                if (writer != null) {
                    writer.close();
                    writer = null;
                }
            }
            idx--;
            assertEquals(idx, countFeatures(loadFeatures(sds, typeName)));

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Examples of org.geotools.data.FeatureWriter


        int idx = loadFeatures(sds, typeName).size();
        assertEquals(idx, countFeatures(loadFeatures(sds, typeName)));


        while (idx > 0) {
            FeatureWriter writer = null;
            try {
                writer = sds.getFeatureWriter(sds.getTypeNames()[0], Filter.INCLUDE,
                        Transaction.AUTO_COMMIT);
                while (writer.hasNext()) {
                    writer.next();
                }
                writer.remove();
            } finally {
                if (writer != null) {
                    writer.close();
                    writer = null;
                }
            }
            assertEquals(--idx, countFeatures(loadFeatures(sds, typeName)));
        }

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