Examples of org.geotools.feature.FeatureIterator

org.geotools.feature.FeatureIterator
Streaming access to features, required to {@link #close()} after use.
FeatureIterator is a drop in replacement for Iterator supporting a close method.
Sample use:
```
 FeatureIterator i = featureCollection.features() try { while( i.hasNext() ){ SimpleFeature feature = i.next(); } } finally { i.close(); } 
```
@author Ian Schneider @source $URL$

     */
    public void testRendererBehaviour() throws Exception {
        Query query = new Query(featureSource.getSchema().getTypeName());
        query.setHints(new Hints(new Hints(Hints.JTS_COORDINATE_SEQUENCE_FACTORY, new LiteCoordinateSequenceFactory())));
        FeatureCollection fc = featureSource.getFeatures(query);
        FeatureIterator fi = fc.features();
        while(fi.hasNext()) {
            fi.next();
        }
        fi.close();
    }

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    @SuppressWarnings("unchecked")
    private ReferencedEnvelope getBounds(FeatureSource source) {
        try {
            ReferencedEnvelope boundingBox = new ReferencedEnvelope(DefaultGeographicCRS.WGS84);
            FeatureCollection features = source.getFeatures();
            FeatureIterator iterator = features.features();
            try {
                while (iterator.hasNext()) {
                    Feature f = iterator.next();
                    boundingBox.include(f.getBounds());
                }
            } finally {
                iterator.close();
            }
            return boundingBox;
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

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            int resultCount = getCount(features);
            assertEquals(EXPECTED_RESULT_COUNT, resultCount);


            Feature feature;
            int count = 0;
            FeatureIterator it = features.features();
            for (; it.hasNext();) {
                feature = (Feature) it.next();
                count++;
            }
            it.close();


            assertEquals(EXPECTED_RESULT_COUNT, count);
        } catch (Exception e) {
            e.printStackTrace();
            throw e;

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        }
        return size;
    }


    private int getCount(FeatureCollection features) {
        FeatureIterator iterator = features.features();
        int count = 0;
        try {
            while (iterator.hasNext()) {
                iterator.next();
                count++;
            }
        } finally {
            iterator.close();
        }
        return count;
    }

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            // to pass namespace context to filter factory
            ffac = new FilterFactoryImplNamespaceAware(namespaces);
        }


        final String phenomNamePath = "aw:relatedObservation/aw:PhenomenonTimeSeries/om:observedProperty/swe:Phenomenon/gml:name";
        FeatureIterator it = features.features();
        for (; it.hasNext();) {
            feature = (Feature) it.next();
            count++;
            {
                PropertyName gmlName = ffac.property("gml:name");
                PropertyName phenomName = ffac.property(phenomNamePath);


                Object nameVal = gmlName.evaluate(feature, String.class);
                assertNotNull("gml:name evaluated to null", nameVal);


                Object phenomNameVal = phenomName.evaluate(feature, String.class);
                assertNotNull(phenomNamePath + " evaluated to null", phenomNameVal);
            }
            {
                PropertyName sampledFeatureName = ffac.property("sa:sampledFeature");
                Attribute sampledFeatureVal = (Attribute) sampledFeatureName.evaluate(feature);
                assertNotNull("sa:sampledFeature evaluated to null", sampledFeatureVal);
                assertEquals(0, ((Collection) sampledFeatureVal.getValue()).size());
                Map attributes = (Map) sampledFeatureVal.getUserData().get(Attributes.class);
                assertNotNull(attributes);
                Name xlinkTitle = name(XLINK.NAMESPACE, "title");
                assertTrue(attributes.containsKey(xlinkTitle));
                assertNotNull(attributes.get(xlinkTitle));


                Name xlinkHref = name(XLINK.NAMESPACE, "href");
                assertTrue(attributes.containsKey(xlinkHref));
                assertNotNull(attributes.get(xlinkHref));
            }


            {
                final String elementPath = "aw:relatedObservation/aw:PhenomenonTimeSeries/om:result/cv:CompactDiscreteTimeCoverage";
                PropertyName elementName = ffac.property(elementPath);
                Object timeCovVal = elementName.evaluate(feature);
                assertNotNull(elementPath, timeCovVal);
                assertTrue(timeCovVal instanceof Feature);
                final List elements = (List) ((Feature) timeCovVal).getValue();
                assertEquals(1, elements.size());
            }


        }
        it.close();


        count = 0;
        FeatureIterator<? extends Feature> simpleIterator = ((AbstractMappingFeatureIterator) features.features()).getSourceFeatureIterator();
        for (; simpleIterator.hasNext();) {
            feature = (Feature) simpleIterator.next();

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        assertEquals(EXPECTED_SIMPLE_FEATURE_COUNT, count);


    }


    private int getCount(FeatureCollection features) {
        FeatureIterator iterator = features.features();
        int count = 0;
        try {
            while (iterator.hasNext()) {
                iterator.next();
                count++;
            }
        } finally {
            iterator.close();
        }
        return count;
    }

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        FeatureSource fSource = (FeatureSource) dataAccess.getFeatureSource(typeName);
        FeatureCollection features = (FeatureCollection) fSource.getFeatures();


        assertEquals(5, size(features));


        FeatureIterator iterator = features.features();
        while (iterator.hasNext()) {
            Feature next = iterator.next();
            Collection<Property> children = next.getProperties("nestedFeature");
            if (next.getIdentifier().toString().equals("cc.1")) {
                // _=STRING:String,LINK_ONE:String,LINK_TWO:String
                // sc.1=string_one|cc.1|cc.2
                // sc.2=string_two|cc.1|cc.2
                // sc.3=string_three|NULL|cc.2
                assertEquals(2, children.size());
            } else {
                assertEquals(0, children.size());
            }
            for (Property nestedFeature : children) {
                Object value = nestedFeature.getValue();
                assertNotNull(value);
                value = ((Collection) value).iterator().next();
                assertTrue(value instanceof FeatureImpl);
                Feature feature = (Feature) value;
                assertNotNull(feature.getProperty("someAttribute").getValue());
            }
        }


        // <AttributeMapping>
        // <targetAttribute>FEATURE_LINK[2]</targetAttribute>
        // <sourceExpression>
        // <OCQL>LINK_TWO</OCQL>
        // </sourceExpression>
        // </AttributeMapping>
        dsParams = new HashMap();
        url = getClass().getResource(schemaBase + "SecondParentFeature.xml");
        assertNotNull(url);


        dsParams.put("dbtype", "app-schema");
        dsParams.put("url", url.toExternalForm());
        dataAccess = DataAccessFinder.getDataStore(dsParams);
        assertNotNull(dataAccess);
        typeName = Types.typeName("http://example.com", "SecondParentFeature");
        featureType = dataAccess.getSchema(typeName);
        assertNotNull(featureType);


        fSource = (FeatureSource) dataAccess.getFeatureSource(typeName);
        features = (FeatureCollection) fSource.getFeatures();


        assertEquals(5, size(features));


        iterator = features.features();
        while (iterator.hasNext()) {
            Feature next = iterator.next();
            Collection<Property> children = next.getProperties("nestedFeature");
            if (next.getIdentifier().toString().equals("cc.2")) {
                // _=STRING:String,LINK_ONE:String,LINK_TWO:String
                // sc.1=string_one|cc.1|cc.2
                // sc.2=string_two|cc.1|cc.2

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        // copy unrolled filter
        ((MappingFeatureCollection) collection).setUnrolledFilter(instance.baseTableQuery
                .getFilter());


        FeatureIterator featureIterator = collection.features();


        if (!(featureIterator instanceof DataAccessMappingFeatureIterator)) {
            throw new IOException(
                    "Internal error: Data Access Mapping feature Iterator expected but found "
                            + featureIterator);

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        public void writeJSONString(Writer out) throws IOException {
            FeatureEncoder featureEncoder = 
                new FeatureEncoder((SimpleFeatureType) features.getSchema());
            
            out.write("[");
            FeatureIterator i = features.features();
            try {
                if (i.hasNext()) {
                    SimpleFeature f = (SimpleFeature) i.next();
                    out.write(featureEncoder.toJSONString(f));
                    
                    while(i.hasNext()) {
                        out.write(",");
                        f = (SimpleFeature) i.next();
                        out.write(featureEncoder.toJSONString(f));
                    }
                }
            }
            finally {
                if( i != null ){
                    i.close();
                }
            }
            out.write("]");
            out.flush();
        }

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        for (int i = 0; i < 2; i++) {
            Geometry expected = gf.createPoint(new Coordinate(i, i)).buffer(10d);
            FeatureCollection sub = buffered.subCollection(ff.equals(ff.property("integer"),
                    ff.literal(i)));
            assertEquals(1, sub.size());
            FeatureIterator iterator = sub.features();
            SimpleFeature sf = (SimpleFeature) iterator.next();
            assertTrue(expected.equals((Geometry) sf.getDefaultGeometry()));
            iterator.close();
        }
    }

View Full Code Here

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