As mentioned previously there are four parsers, please look at test cases (currently the developer community seems to be pegged on paid work, or prep for next weeks conference, hopefully someone will have time to work on users guides eventually, but right now that does not seem to pay the bills).
Please note that any of the Filter examples also show how to parse GML (as Filter includes GML literals) - SAX: http://svn.geotools.org/geotools/branches/2.2.x/module/main/test/org/geotools/filter/ParserTest.java - DOM: http://svn.geotools.org/geotools/branches/2.2.x/module/main/test/org/geotools/filter/DOMParserTest.java - XDO: http://svn.geotools.org/geotools/branches/2.2.x/module/main/test/org/geotools/xml/GMLStreamingParserStressTest.java - GTXML: see article I sent out a link to an article yesterday that provides an over view of the four parsers. You may want to just try using the WFS, step through with a debugger and see how it works: package org.geotools.data.wfs; import java.io.IOException; import java.io.InputStream; import java.net.ConnectException; import java.net.MalformedURLException; import java.net.NoRouteToHostException; import java.net.URL; import java.net.UnknownHostException; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.NoSuchElementException; import java.util.logging.Level; import java.util.logging.Logger; import junit.framework.TestCase; import org.geotools.data.DataStore; import org.geotools.data.DataUtilities; import org.geotools.data.DefaultQuery; import org.geotools.data.DefaultTransaction; import org.geotools.data.FeatureEvent; import org.geotools.data.FeatureListener; import org.geotools.data.FeatureReader; import org.geotools.data.FeatureSource; import org.geotools.data.FeatureStore; import org.geotools.data.Query; import org.geotools.data.Transaction; import org.geotools.feature.Feature; import org.geotools.feature.FeatureCollection; import org.geotools.feature.FeatureIterator; import org.geotools.feature.FeatureType; import org.geotools.feature.IllegalAttributeException; import org.geotools.filter.AttributeExpression; import org.geotools.filter.CompareFilter; import org.geotools.filter.FidFilter; import org.geotools.filter.Filter; import org.geotools.filter.FilterFactory; import org.geotools.filter.FilterFactoryFinder; import org.geotools.filter.FilterType; import org.geotools.filter.IllegalFilterException; import org.geotools.filter.NullFilter; import org.xml.sax.SAXException; import com.vividsolutions.jts.geom.Coordinate; import com.vividsolutions.jts.geom.Envelope; import com.vividsolutions.jts.geom.GeometryFactory; import com.vividsolutions.jts.geom.LinearRing; import com.vividsolutions.jts.geom.MultiPolygon; import com.vividsolutions.jts.geom.Polygon; public class GeoServerOnlineTest extends TestCase { //public static final String SERVER_URL = "http://192.168.50.92:8080/geoserver/wfs?REQUEST=GetCapabilities";; public static final String TO_EDIT_TYPE = "topp:bc_pubs"; public static final String ATTRIBUTE_TO_EDIT = "name"; public static final String NEW_EDIT_VALUE = "newN"; private static final int EPSG_CODE = 3005; private URL url = null; public void setUp() throws MalformedURLException { url = new URL("http://localhost:8080/geoserver/wfs?REQUEST=GetCapabilities";); //url = new URL(SERVER_URL); if( url != null && url.toString().indexOf("localhost")!= -1 ) { InputStream stream = null; try { stream = url.openStream(); } catch( Throwable t ) { System.err.println("Warning you local geoserver is not available - "+getName()+" test disabled "); url = null; } finally { if( stream != null ) try { stream.close(); } catch (IOException e) { // whatever } } } } public void testTypes() throws IOException, NoSuchElementException { WFSDataStore wfs; try { wfs = WFSDataStoreReadTest.getDataStore(url); } catch (ConnectException e) { e.printStackTrace(System.err); return; } catch (UnknownHostException e) { e.printStackTrace(System.err); return; } catch (NoRouteToHostException e) { e.printStackTrace(System.err); return; } String types[] = wfs.getTypeNames(); String typeName = "unknown"; for( int i=0; i<types.length;i++){ typeName = types[i]; if( typeName.equals("topp:geometrytype")) continue; FeatureType type = wfs.getSchema( typeName ); type.getTypeName(); type.getNamespace(); FeatureSource source = wfs.getFeatureSource( typeName ); source.getBounds(); FeatureCollection features = source.getFeatures(); features.getBounds(); features.getSchema(); features.getFeatureType(); DefaultQuery query = new DefaultQuery( typeName, Filter.NONE, 20, Query.ALL_NAMES, "work already" ); features = source.getFeatures( query ); features.size(); features.getCount(); Iterator reader = features.iterator(); while( reader.hasNext() ){ Feature feature = (Feature)reader.next(); } features.close(reader); FeatureIterator iterator = features.features(); while( iterator.hasNext() ){ Feature feature = iterator.next(); } features.close( iterator ); } } public void testSingleType() throws IOException, NoSuchElementException { WFSDataStore wfs; try { wfs = WFSDataStoreReadTest.getDataStore(url); } catch (ConnectException e) { e.printStackTrace(System.err); return; } catch (UnknownHostException e) { e.printStackTrace(System.err); return; } catch (NoRouteToHostException e) { e.printStackTrace(System.err); return; } String typeName = "topp:geometrytype"; FeatureType type = wfs.getSchema( typeName ); type.getTypeName(); type.getNamespace(); FeatureSource source = wfs.getFeatureSource( typeName ); source.getBounds(); FeatureCollection features = source.getFeatures(); features.getBounds(); features.getSchema(); features.getFeatureType(); DefaultQuery query = new DefaultQuery( typeName, Filter.NONE, 20, Query.ALL_NAMES, "work already" ); features = source.getFeatures( query ); features.size(); features.getCount(); Iterator reader = features.iterator(); while( reader.hasNext() ){ Feature feature = (Feature)reader.next(); System.out.println(feature); } features.close(reader); FeatureIterator iterator = features.features(); while( iterator.hasNext() ){ Feature feature = iterator.next(); } features.close( iterator ); } public void testFeatureType() throws NoSuchElementException, IOException, SAXException{ WFSDataStoreReadTest.doFeatureType(url,true,true,0); } public void testFeatureReader() throws NoSuchElementException, IOException, IllegalAttributeException, SAXException{ WFSDataStoreReadTest.doFeatureReader(url,true,true,0); } public void testFeatureReaderWithFilter() throws NoSuchElementException, IllegalAttributeException, IOException, SAXException{ WFSDataStoreReadTest.doFeatureReaderWithFilter(url,true,true,0); } public void testFeatureReaderWithFilterGET() throws NoSuchElementException, IllegalAttributeException, IOException, SAXException{ WFSDataStoreReadTest.doFeatureReaderWithFilter(url,true,false,0); } public void testFeatureReaderWithFilterPOST() throws NoSuchElementException, IllegalAttributeException, IOException, SAXException{ WFSDataStoreReadTest.doFeatureReaderWithFilter(url,false,true,0); } // RR change the data? // NOPE, it's in Lat-Long for the Env, BCAlbers for the data public void testFeatureReaderWithFilterBBoxGET() throws NoSuchElementException, IllegalAttributeException, IOException, SAXException, IllegalFilterException{ // minx,miny,maxx,maxy Map m = new HashMap(); m.put(WFSDataStoreFactory.URL.key,url); m.put(WFSDataStoreFactory.TIMEOUT.key,new Integer(100000)); DataStore post = (WFSDataStore)(new WFSDataStoreFactory()).createNewDataStore(m); Envelope bbox = post.getFeatureSource(post.getTypeNames()[0]).getBounds(); WFSDataStoreReadTest.doFeatureReaderWithBBox(url,true,false,0,bbox); } public void testFeatureReaderWithFilterBBoxPOST() throws NoSuchElementException, IllegalAttributeException, IOException, SAXException, IllegalFilterException{ Map m = new HashMap(); m.put(WFSDataStoreFactory.URL.key,url); m.put(WFSDataStoreFactory.TIMEOUT.key,new Integer(100000)); DataStore post = (WFSDataStore)(new WFSDataStoreFactory()).createNewDataStore(m); Envelope bbox = post.getFeatureSource(post.getTypeNames()[0]).getBounds(); WFSDataStoreReadTest.doFeatureReaderWithBBox(url,true,false,0,bbox); } /** * Tests case where filter is makes use of 2 different attributes but Query object only requests 1 of the two * attributes. This is a fix for a bug that has occurred. */ public void testFeatureReaderWithQuery() throws Exception{ Map m = new HashMap(); m.put(WFSDataStoreFactory.URL.key,url); m.put(WFSDataStoreFactory.TIMEOUT.key,new Integer(100000)); WFSDataStore wfs = (WFSDataStore)(new WFSDataStoreFactory()).createNewDataStore(m); FilterFactory fac = FilterFactoryFinder.createFilterFactory(); CompareFilter filter=fac.createCompareFilter(FilterType.COMPARE_EQUALS); filter.addLeftValue(fac.createAttributeExpression("NAME")); filter.addRightValue(fac.createLiteralExpression("E 58th St")); Query query=new DefaultQuery("tiger:tiger_roads", filter); FeatureReader reader = wfs.getFeatureReader(query, new DefaultTransaction()); int expected=0; while (reader.hasNext()){ expected++; reader.next(); } query=new DefaultQuery("tiger:tiger_roads", filter, 100, new String[]{"CFCC"}, ""); reader = wfs.getFeatureReader(query, new DefaultTransaction()); int count=0; while (reader.hasNext()){ count++; reader.next(); } assertEquals(expected, count); } /** * Writing test that only engages against a remote geoserver. * <p> * Makes reference to the standard featureTypes that geoserver ships with. * </p> */ public void testWrite() throws NoSuchElementException, IllegalFilterException, IOException, IllegalAttributeException{ Map m = new HashMap(); m.put(WFSDataStoreFactory.URL.key,url); m.put(WFSDataStoreFactory.TIMEOUT.key,new Integer(10000000)); DataStore post = (WFSDataStore)(new WFSDataStoreFactory()).createNewDataStore(m); String typename = TO_EDIT_TYPE; FeatureType ft = post.getSchema( typename ); FeatureSource fs = post.getFeatureSource( typename ); class Watcher implements FeatureListener { public int count=0; public void changed( FeatureEvent featureEvent ) { System.out.println("Event "+featureEvent ); count++; } } Watcher watcher = new Watcher(); fs.addFeatureListener( watcher ); FidFilter startingFeatures=createFidFilter(fs); try{ GeometryFactory gf = new GeometryFactory(); MultiPolygon mp = gf.createMultiPolygon(new Polygon[]{gf.createPolygon(gf.createLinearRing(new Coordinate[]{new Coordinate(-88.071564,37.51099), new Coordinate(-88.467644,37.400757), new Coordinate(-90.638329,42.509361), new Coordinate(-89.834618,42.50346),new Coordinate(-88.071564,37.51099)}),new LinearRing[]{})}); mp.setUserData("http://www.opengis.net/gml/srs/epsg.xml#"+EPSG_CODE); FilterFactory filterFac = FilterFactoryFinder.createFilterFactory(); NullFilter geomNullCheck = filterFac.createNullFilter(); AttributeExpression geometryAttributeExpression = filterFac.createAttributeExpression(ft.getDefaultGeometry().getName()); geomNullCheck.nullCheckValue(geometryAttributeExpression); Query query=new DefaultQuery(typename, geomNullCheck.not(), 1, Query.ALL_NAMES, null); FeatureIterator inStore = fs.getFeatures(query).features(); Feature f,f2; try{ Feature feature = inStore.next(); f = ft.create(ft.duplicate(feature).getAttributes(new Object[ft.getAttributeCount()])); f2 = ft.create(ft.duplicate(feature).getAttributes(new Object[ft.getAttributeCount()])); assertFalse("Max Feature failed", inStore.hasNext()); }finally{ inStore.close(); } Logger.getLogger("org.geotools.data.wfs").setLevel(Level.FINE); FeatureCollection inserts = DataUtilities.collection(new Feature[] {f,f2}); FidFilter fp = WFSDataStoreWriteOnlineTest.doInsert(post,ft,inserts); /// okay now count ... FeatureReader count = post.getFeatureReader(new DefaultQuery(ft.getTypeName()),Transaction.AUTO_COMMIT); int i = 0; while(count.hasNext() && i<3){ f = count.next();i++; } count.close(); WFSDataStoreWriteOnlineTest.doDelete(post,ft,fp); WFSDataStoreWriteOnlineTest.doUpdate(post,ft, ATTRIBUTE_TO_EDIT, NEW_EDIT_VALUE); // assertFalse("events not fired", watcher.count == 0); }finally{ try{ ((FeatureStore)fs).removeFeatures(startingFeatures.not()); }catch (Exception e) { System.out.println(e); } } } private FidFilter createFidFilter(FeatureSource fs) throws IOException { FeatureIterator iter = fs.getFeatures().features(); try{ FidFilter filter = FilterFactoryFinder.createFilterFactory().createFidFilter(); while(iter.hasNext()) filter.addFid(iter.next().getID()); return filter; }finally{ iter.close(); } } } > Can someone help me get boot strapped with GML reading, by providing a > sample (java) app that parses a GML file ? > > Thanks in advance. > > > > ------------------------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > _______________________________________________ > Geotools-gt2-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
