Examples of org.geotools.feature.FeatureCollection

org.geotools.feature.FeatureCollection
Collection of features, often handled as a result set.
Where possible FeatureCollection is method compatible with {@link Collection}.

SimpleFeatureCollection house rules:
- Each iterator is considered a live connection which must be closed (see example below)
- Features are not specifically ordered within the SimpleFeatureCollection
- Two Feature instances cannot exist with the same {@link FeatureId}
FeatureIterator close

FeatureCollection provides streaming access with the following restriction on the use of {@link FeatureIterator}: You must call {@link FeatureIterator#close()}. This allows FeatureCollection to clean up any operating system resources used to access information.

Example (safe) use:
```
 FeatureIterator iterator = featureCollection.features(); try { while( iterator.hasNext() ){ Feature feature = iterator.next(); System.out.println( feature.getID() ); } } finally { iterator.close(); } 
```
And in Java 7:
```
 try ( FeatureIterator iterator = featureCollection.features() ){ while( iterator.hasNext() ){ Feature feature = iterator.next(); System.out.println( feature.getID() ); } } 
```
Handy Tip: Although many resource backed collections will choose to release resources at when the iterator has reached the end of its contents this is not something you should rely on.

FeatureCollection Implementation Tips

Auto close: Try and close up resources when you can detect that an Iterator is no longer in use.

Lazy Connect: FeatureCollection is used in two fashions, as a result set, where each iterator acts as a cursor over the content. Also as a predefined query which can be refined further. An example is using featureCollection.subCollection( Filter ) or featureCollection.sort( SortBy ) before listing features out of a FeatureCollection.
@see org.geotools.Feature @author Ian Turton, CCG @author Rob Hranac, VFNY @author Ian Schneider, USDA-ARS @author Jody Garnett, LISAsoft @source $URL$ @version $Id$


    public void testNoElementsReturned() throws Exception {
        final Filter filter = ff.equals(ff.property("gml:name"), ff
                .literal("invalid name"));        


        FeatureCollection features = getFeatures(MAX_FEATURES, filter);
        
        assertEquals(0, DataUtilities.count(features));


        List<Feature> results = new ArrayList<Feature>();
        FeatureIterator it = features.features();
        for (; it.hasNext();) {
            results.add((Feature) it.next());
        }
        it.close();
        assertEquals(0, results.size());

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        final Name GeologicUnitName = new NameImpl(FeatureChainingTest.GSMLNS, "GeologicUnit");
        final Name GeologicUnitType = new NameImpl(FeatureChainingTest.GSMLNS, "GeologicUnitType");


        List<Feature> results = new ArrayList<Feature>();


        FeatureCollection features = getFeatures(Query.DEFAULT_MAX, Filter.INCLUDE);
        FeatureIterator it = features.features();
        for (; it.hasNext();) {
            results.add((Feature) it.next());
        }
        it.close();

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    }
    
    private FeatureCollection getFeatures(final int maxFeatures, Filter inputFilter)
            throws Exception {
        FeatureSource fSource = (FeatureSource) mappingDataStore.getFeatureSource(typeName);
        FeatureCollection features = (FeatureCollection) fSource.getFeatures(namedQuery(
                inputFilter, new Integer(maxFeatures)));
        return features;
    }

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        buildDocument(resource);
        
        FeatureCollectionType fc = (FeatureCollectionType) parse();
        assertEquals( 1, fc.getFeature().size() );
        
        FeatureCollection features = (FeatureCollection) fc.getFeature().get( 0 );
        assertEquals( 2, features.size() );
        
        FeatureIterator fi = features.features();
        try {
            assertTrue( fi.hasNext() );
            SimpleFeature f = (SimpleFeature) fi.next();
            
            assertEquals( "feature", f.getType().getTypeName() );

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        assertNotNull(mfDataAccess);


        FeatureSource guSource = (FeatureSource) guDataStore
                .getFeatureSource(FeatureChainingTest.GEOLOGIC_UNIT);


        FeatureCollection guFeatures = (FeatureCollection) guSource.getFeatures();
        assertEquals(3, size(guFeatures));


        FeatureSource cpSource = DataAccessRegistry
                .getFeatureSource(FeatureChainingTest.COMPOSITION_PART);
        FeatureCollection cpFeatures = (FeatureCollection) cpSource.getFeatures();
        assertEquals(4, size(cpFeatures));


        FeatureSource cgiSource = DataAccessRegistry
                .getFeatureSource(FeatureChainingTest.CGI_TERM_VALUE);
        FeatureCollection cgiFeatures = (FeatureCollection) cgiSource.getFeatures();
        assertEquals(6, size(cgiFeatures));
    }

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        Hints hints = new Hints(Hints.JTS_COORDINATE_SEQUENCE_FACTORY,
                new LiteCoordinateSequenceFactory());
        q.setHints(hints);


        // check the srs you get is the expected one
        FeatureCollection fc = fs.getFeatures(q);
        FeatureType fcSchema = fc.getSchema();
        assertEquals(epsg4326, fcSchema.getCoordinateReferenceSystem());
        assertEquals(epsg4326, fcSchema.getGeometryDescriptor().getCoordinateReferenceSystem());


        // build up the reference 2d line, the 3d one is (1 1 0, 2 2 0, 4 2 1, 5
        // 1 1)

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                                    iterator = Arrays.asList(array).iterator();
                                } else if (obj instanceof Collection) {
                                    Collection collection = (Collection) obj;
                                    iterator = collection.iterator();
                                } else if (obj instanceof FeatureCollection) {
                                    FeatureCollection collection = (FeatureCollection) obj;
                                    iterator = DataUtilities.iterator( collection.features() );
                                } else {
                                    iterator = new SingleIterator(obj);
                                }


                                entry.children.add(new Object[] { child, iterator, obj });

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     *            a Style object to be used in rendering this layer
     */
    @SuppressWarnings("unchecked")
    public void addLayer(Collection collection, Style style) {
        if (collection instanceof FeatureCollection) {
            FeatureCollection featureCollection = (FeatureCollection) collection;
            addLayer( featureCollection, style);
        } else {
            throw new IllegalArgumentException("FeatureCollection required");
        }
    }

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     * @param collection
     *            Collection with the new layer that will be added.
     */
    public void addLayer(Collection collection, Style style) {
        if (collection instanceof FeatureCollection) {
            FeatureCollection featureCollection = (FeatureCollection) collection;
            addLayer(featureCollection, style);
        } else {
            throw new IllegalArgumentException("FeatureCollection required");
        }
    }

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        GMLConfiguration config = new GMLConfiguration();
        Parser p = new Parser( config );
        Object o = p.parse( new ByteArrayInputStream( out.toByteArray() ) );
        assertTrue( o instanceof FeatureCollection );
        
        FeatureCollection features = (FeatureCollection) o;
        assertEquals( 3, features.size() );
        
        FeatureIterator fi = features.features();
        try {
            for ( int i = 0; i < 3; i++ ) {
                assertTrue( fi.hasNext() );
                
                SimpleFeature f = (SimpleFeature) fi.next();

View Full Code Here

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Examples of org.geotools.feature.FeatureCollection

FeatureIterator close

FeatureCollection Implementation Tips

Related Classes of org.geotools.feature.FeatureCollection