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 $Id$

        LRSMeasureProcess process = new LRSMeasureProcess();
        SimpleFeatureCollection origional = source.getFeatures();
        Point point = geometryFactory.createPoint(new Coordinate(1.0, 0.0));


        try {
            FeatureCollection result = process.execute(origional, "from_lrs_bad", "to_lrs", point,
                    null);
            Assert.fail("Expected error from bad from_lrs name");
        } catch (ProcessException e) {
            // Successful
        }

View Full Code Here

        LRSMeasureProcess process = new LRSMeasureProcess();
        SimpleFeatureCollection origional = source.getFeatures();
        Point point = geometryFactory.createPoint(new Coordinate(1.0, 0.0));


        try {
            FeatureCollection result = process.execute(origional, "from_lrs", "to_lrs_bad", point,
                    null);
            Assert.fail("Expected error from bad to_lrs name");
        } catch (ProcessException e) {
            // Successful
        }

View Full Code Here

        LRSMeasureProcess process = new LRSMeasureProcess();
        SimpleFeatureCollection origional = source.getFeatures();
        Point point = geometryFactory.createPoint(new Coordinate(1.0, 0.0));


        try {
            FeatureCollection result = process.execute(origional, null, "to_lrs", point, null);
            Assert.fail("Expected error from bad from_lrs name");
        } catch (ProcessException e) {
            // Successful
        }
    }

View Full Code Here

        LRSMeasureProcess process = new LRSMeasureProcess();
        SimpleFeatureCollection origional = source.getFeatures();
        Point point = geometryFactory.createPoint(new Coordinate(1.0, 0.0));


        try {
            FeatureCollection result = process.execute(origional, "from_lrs", null, point, null);
            Assert.fail("Expected error from bad to_lrs name");
        } catch (ProcessException e) {
            // Successful
        }
    }

View Full Code Here

        SimpleFeatureSource source = featureSource.getFeatureSource("lrssimple");
        LRSMeasureProcess process = new LRSMeasureProcess();
        SimpleFeatureCollection origional = source.getFeatures();


        try {
            FeatureCollection result = process.execute(origional, "from_lrs", "to_lrs_bad", null,
                    null);
            Assert.fail("Expected error from bad measure value");
        } catch (ProcessException e) {
            // Successful
        }

View Full Code Here

    }


    @Test
    public void testNoFeaturesGiven() throws Exception {
        LRSMeasureProcess process = new LRSMeasureProcess();
        FeatureCollection origional = FeatureCollections.newCollection();
        Point point = geometryFactory.createPoint(new Coordinate(1.0, 0.0));


        FeatureCollection result = process.execute(origional, "from_lrs", "to_lrs", point, null);
        Assert.assertEquals(0, result.size());
    }

View Full Code Here

        SimpleFeatureSource source = featureSource.getFeatureSource("lrssimple");
        LRSMeasureProcess process = new LRSMeasureProcess();
        SimpleFeatureCollection origional = source.getFeatures();
        Point point = geometryFactory.createPoint(new Coordinate(1.0, 0.0));


        FeatureCollection result = process.execute(origional, "from_lrs", "to_lrs", point, null);
        Assert.assertEquals(1, result.size());
        Feature feature = result.features().next();
        Assert.assertNotNull(feature.getProperty("lrs_measure"));
        Assert.assertNotNull(feature.getProperty("lrs_measure").getValue());
        Double measure = (Double) feature.getProperty("lrs_measure").getValue();
        Assert.assertEquals(1.0, measure, 0.0);
    }

View Full Code Here

    
    public List getProperties(Object object) throws Exception {
        Object[] prop = new Object[2];
        prop[0] = KML.Placemark;
        if ( object instanceof FeatureCollection ) {
            FeatureCollection fc = (FeatureCollection) object;
            //TODO: this does not close the iterator!!
            Iterator iterator = DataUtilities.iterator( fc.features() );
            
            prop[1] = iterator;
        }
        else if ( object instanceof Collection ) {
            prop[1] = ((Collection)object).iterator();

View Full Code Here

    static void bencharkGeometryEncode(FeatureSource data) throws Exception {
        GeometryJSON gjson = new GeometryJSON();
        OutputStream out = System.out;/*new NullOutputStream();*/
        Writer writer = new OutputStreamWriter(out);
        
        FeatureCollection features = data.getFeatures();
        FeatureIterator it = features.features();


        long t1 = System.currentTimeMillis();
        while(it.hasNext()) {
            SimpleFeature f = (SimpleFeature) it.next();
            gjson.write((Geometry) f.getDefaultGeometry(), writer);

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        assertEquals(strip(collectionText()), writer.toString());
    }
    
    public void testFeatureCollectionRead() throws Exception {
        
        FeatureCollection actual = 
            fjson.readFeatureCollection(reader(strip(collectionText())));
        assertNotNull(actual);
        
        FeatureCollection expected = collection();
        assertEquals(expected.size(), actual.size());
        
        FeatureIterator a = actual.features();
        FeatureIterator e = expected.features();
        
        while(e.hasNext()) {
            assertTrue(a.hasNext());
            assertEqualsLax((SimpleFeature)e.next(), (SimpleFeature) a.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