Examples of org.opengis.feature.FeatureVisitor

org.opengis.feature.FeatureVisitor
FeatureVisitor interface to allow for container optimised traversal.
The iterator construct from the Collections api is well understood and loved, but breaks down for working with large GIS data volumes. By using a visitor we allow the implementor of a Feature Collection to make use of additional resources (such as multiple processors or tiled data) concurrently.
This interface is most often used for calculations and data transformations and an implementations may intercept known visitors (such as "bounds" or reprojection) and engage an alternate work flow.
@author Cory Horner (Refractions Research, Inc) @source $URL$


        // build the result feature collection
        final SimpleFeatureBuilder fb = new SimpleFeatureBuilder(targetSchema);
        final List<SimpleFeature> features = new ArrayList<SimpleFeature>();
        try {
            fc.accepts(new FeatureVisitor() {
                
                @Override
                public void visit(Feature feature) {
                    fb.init((SimpleFeature) feature);
                    SimpleFeature f = fb.buildFeature(feature.getIdentifier().getID());

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        assertFalse( "selection non empty", features.isEmpty() );        
        assertTrue( "selection non empty", features.size() > 0 );
        ReferencedEnvelope bounds = features.getBounds();
        
        final Set<FeatureId> selection = new LinkedHashSet<FeatureId>();
        features.accepts( new FeatureVisitor() {
            public void visit(Feature feature) {
                selection.add( feature.getIdentifier() );
            }
        }, null );
        assertFalse( selection.isEmpty() );

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            // assertTrue("GenStreams".equals(typeName))
            // assertTrue(fCollection.size()==sortedCollection.size());


            final List<Long> catIds = new ArrayList<Long>();


            FeatureVisitor checkSortVisitor = new FeatureVisitor() {


                public void visit(Feature feature) {
                    SimpleFeature sf = (SimpleFeature) feature;
                    assertTrue(feature instanceof PreGeneralizedSimpleFeature);
                    long catid = (Long) sf.getAttribute("CAT_ID");

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      * @param schema
      * @param list
      */
     public ListFeatureCollection(SimpleFeatureCollection copy ) throws IOException {
         this( copy.getSchema() );
         copy.accepts( new FeatureVisitor() {
      public void visit(Feature feature) {
        list.add( (SimpleFeature) feature );
      }
    }, null );
     }

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        if ((collection == null) ) {
            throw new IllegalArgumentException("Provided SimpleFeatureCollection is empty");
        }
        synchronized (memory) {
            try {
                collection.accepts( new FeatureVisitor(){
                    public void visit(Feature feature) {
                        addFeatureInternal( (SimpleFeature) feature );
                    }                
                }, null );
            }

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    // graphExample start
    final LineGraphGenerator generator = new BasicLineGraphGenerator();
    SimpleFeatureCollection fc = featureSource.getFeatures();
    
    fc.accepts(new FeatureVisitor() {
        public void visit(Feature feature) {
            generator.add(feature);
        }
    }, null);
    Graph graph = generator.getGraph();

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        PropertyName exp = ff.property("foo");
        Function standardDeviation = ff.function("StandardDeviation", exp, classes);
        assertNotNull( "step 1 - standard deviation function", standardDeviation );
        
        final Classifier classifer = standardDeviation.evaluate( featureCollection, Classifier.class );
        featureCollection.accepts( new FeatureVisitor() {
            @Override
            public void visit(Feature f) {
                SimpleFeature feature = (SimpleFeature) f;
                Object value = feature.getAttribute("foo");
                assertNotNull( feature.getID()+" foo", value );

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     * @return
     */
    public static Set<String> fidSet(FeatureCollection<?, ?> featureCollection) {
        final HashSet<String> fids = new HashSet<String>();
        try {
            featureCollection.accepts(new FeatureVisitor() {
                public void visit(Feature feature) {
                    fids.add(feature.getIdentifier().getID());
                }
            }, null);
        } catch (IOException ignore) {

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        final String[] properties = { "cat", "str1", "the_geom" };
        final SimpleFeatureType featureType;
        featureType = getTypeView(featureName, schemaLocation, GEOS_ARCHSITES.CRS, properties);


        final FeatureVisitor assertor = new FeatureAssertor(featureType);


        URL url = TestData.getResource(this, GEOS_ARCHSITES.DATA);
        GetFeatureParser parser = getParser(featureName, schemaLocation, featureType, url);


        int nof = parser.getNumberOfFeatures();

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        final String[] properties = { "the_geom", "STATE_NAME", "STATE_FIPS", "SUB_REGION",
                "SAMP_POP" };
        final SimpleFeatureType featureType;
        featureType = getTypeView(featureName, schemaLocation, GEOS_STATES.CRS, properties);


        final FeatureVisitor assertor = new FeatureAssertor(featureType) {
            @Override
            public void visit(final Feature feature) {
                super.visit(feature);
                final String fid = feature.getIdentifier().getID();
                final int numPolygons;

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