Examples of org.geotools.xml.StreamingParser

org.geotools.xml.StreamingParser
3.org/2001/XMLSchema-instance" xmlns:gml="http://www.opengis.net/gml" xmlns:test="http://www.geotools.org/test" xsi:schemaLocation="http://www.geotools.org/test test.xsd"> <gml:featureMember> <test:TestFeature fid="0"> ... </test:TestFeature> </gml:featureMember> <gml:featureMember> <test:TestFeature fid="1"> ... </test:TestFeature> </gml:featureMember> <gml:featureMember> <test:TestFeature fid="2"> .... </test:TestFeature> </gml:featureMember> </test:TestFeatureCollection> And suppose we want to stream back each feature as it is parsed.

1. Element Name
Objects are streamed back when an element of a particular name has been parsed.
```
 Configuration configuration = new GMLConfiguration(); QName elementName = new QName( "http://www.geotools.org/test", "TestFeature" ); StreamingParser parser = new StreamingParser( configuration, elementName ); Feature f = null; while ( ( f = parser.parse() ) != null ) { ... } 
```
2. Type
Objects are streamed back when an element has been parsed into an object of a particular type.
```
 Configuration configuration = new GMLConfiguration(); StreamingParser parser = new StreamingParser( configuration, Feature.class ); Feature f = null; while ( ( f = parser.parse() ) != null ) { ... } 
```
3. Xpath Expression
Objects are streamed back when an element has been parsed which matches a particular xpath expression.
```
 Configuration configuration = new GMLConfiguration(); String xpath = "//TestFeature"; StreamingParser parser = new StreamingParser( configuration, xpath ); Feature f = null; while ( ( f = parser.parse() ) != null ) { ... } 
```
@author Justin Deoliveira, The Open Planning Project @deprecated {@link PullParser} is meant as a better replacement. @source $URL$

        writer.close();
    }


    public void _testParseGetFeatureStreaming() throws Exception {
        InputStream in = getClass().getResourceAsStream("geoserver-GetFeature.xml");
        StreamingParser parser = new StreamingParser(configuration, in, SimpleFeature.class);


        int n = 0;


        while (parser.parse() != null)
            n++;


        assertEquals(5, n);
    }

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    }


    @Test
    public void testParseGetFeatureStreaming() throws Exception {
        InputStream in = getClass().getResourceAsStream("geoserver-GetFeature.xml");
        StreamingParser parser = new StreamingParser(configuration, in, SimpleFeature.class);


        int n = 0;


        while (parser.parse() != null)
            n++;


        assertEquals(5, n);
    }

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    public void testParseWithSchema() throws Exception {
        
    }


    public void testStreamParse() throws Exception {
        StreamingParser p = new StreamingParser(createConfiguration(), 
            getClass().getResourceAsStream("KML_Samples.kml"), KML.Placemark);
        int count = 0;
        while(p.parse() != null) {
            count++;
        }
        assertEquals(20, count);
    }

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        Collection placemarks = (Collection) f.getAttribute("Feature");
        assertEquals(49, placemarks.size());
    }


    public void testStream() throws Exception {
        StreamingParser parser = new StreamingParser(new KMLConfiguration(),
                getClass().getResourceAsStream("states.kml"), KML.Placemark);
        int count = 0;
        SimpleFeature f = null;


        while ((f = (SimpleFeature) parser.parse()) != null) {
            FeatureTypeStyle style = (FeatureTypeStyle) f.getAttribute("Style");
            assertNotNull(style);


            Symbolizer[] syms = style.rules().get(0).getSymbolizers();
            assertEquals(3, syms.length);

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    FileInputStream fis;
    
    public KMLFeatureReader(String namespace, File file, QName name) throws IOException {
        fis = new FileInputStream(file);
        try {
            parser = new StreamingParser( new KMLConfiguration(), fis, KML.Placemark);
        } catch (Exception e) {
            throw new IOException("Error processing KML file", e);
        } 
        forward();
        if (f != null) type = f.getType();

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            String namespaceURI = featureName.getNamespaceURI();
            String schemaLocation = describeFeatureTypeRequest.toExternalForm();
            appSchemaConfiguration = new WFSAppSchemaConfiguration(wfsConfiguration, namespaceURI,
                    schemaLocation);


            this.parser = new StreamingParser(appSchemaConfiguration, getFeatureResponseStream,
                    featureName);
        } catch (ParserConfigurationException e) {
            throw new DataSourceException(e);
        } catch (SAXException e) {
            if (e.getCause() == null && e.getException() != null) {

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     * of the streaming parser.
     */
    public static void streamParseGML3() throws Exception {
        InputStream in = GMLParsing.class.getResourceAsStream( "states.xml");
        GMLConfiguration gml = new GMLConfiguration();
        StreamingParser parser = new StreamingParser( gml, in, SimpleFeature.class );
        
        int nfeatures = 0;
        SimpleFeature f = null;
        while( ( f = (SimpleFeature) parser.parse() ) != null ) {
            nfeatures++;
            System.out.println(f.getID());
        }
        
        System.out.println("Number of features: " + nfeatures);

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    public SimpleFeatureIterator decodeFeatureIterator(InputStream in, QName elementName)
            throws IOException, ParserConfigurationException, SAXException {
        if (Version.GML2 == version || Version.GML3 == version || Version.WFS1_0 == version
                || Version.WFS1_1 == version) {
            // ParserDelegate parserDelegate = new XSDParserDelegate( gmlConfiguration );
            StreamingParser parser;
            if (elementName != null) {
                parser = new StreamingParser(gmlConfiguration, in, elementName);
            } else {
                parser = new StreamingParser(gmlConfiguration, in, SimpleFeature.class);
            }
            return iterator(parser);
        }
        return null;
    }

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public class GML3ParsingTest extends TestCase {


    public void testWithoutSchema() throws Exception {
        InputStream in = getClass().getResourceAsStream( "states.xml");
        GMLConfiguration gml = new GMLConfiguration();
        StreamingParser parser = new StreamingParser( gml, in, SimpleFeature.class );
        
        int nfeatures = 0;
        SimpleFeature f = null;
        while( ( f = (SimpleFeature) parser.parse() ) != null ) {
            nfeatures++;
            assertNotNull( f.getAttribute( "STATE_NAME"));
            assertNotNull( f.getAttribute( "STATE_ABBR"));
            assertTrue( f.getAttribute( "SAMP_POP") instanceof String );
        }

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        //xml.deleteOnExit();
        tx.transform( new DOMSource( instance ), new StreamResult( xml ) );
        
        InputStream in = new FileInputStream( xml );
        GMLConfiguration gml = new GMLConfiguration();
        StreamingParser parser = new StreamingParser( gml, in, SimpleFeature.class );
        
        int nfeatures = 0;
        SimpleFeature f = null;
        while( ( f = (SimpleFeature) parser.parse() ) != null ) {
            nfeatures++;
            assertNotNull( f.getAttribute( "STATE_NAME"));
            assertNotNull( f.getAttribute( "STATE_ABBR"));
            assertTrue( f.getAttribute( "SAMP_POP") instanceof Double );
        }

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Examples of org.geotools.xml.StreamingParser

1. Element Name

2. Type

3. Xpath Expression

Related Classes of org.geotools.xml.StreamingParser