Buildings are extracted, header and footer are missing

src/eu/simstadt/lowlevelgmlparser/BuildingXmlNode.java

 package eu.simstadt.lowlevelgmlparser;
 
+import com.vividsolutions.jts.geom.Coordinate;
+import com.vividsolutions.jts.geom.GeometryFactory;
+import com.vividsolutions.jts.geom.Point;
 import com.ximpleware.AutoPilot;
 import com.ximpleware.NavException;
 import com.ximpleware.VTDNav;
+import com.ximpleware.XPathEvalException;
+import com.ximpleware.XPathParseException;
 
 
 public class BuildingXmlNode
@@ -12,6 +17,7 @@
 	private int buildingLength;
 	private VTDNav navigator;
 	private AutoPilot coordinatesFinder;
+	private static final GeometryFactory gf = new GeometryFactory();
 
 	public BuildingXmlNode(VTDNav navigator, int buildingOffset, int buildingLength) {
 		this.navigator = navigator;
@@ -20,6 +26,31 @@ public BuildingXmlNode(VTDNav navigator, int buildingOffset, int buildingLength)
 		this.buildingOffset = buildingOffset;
 	}
 
+	public Point getCenterOfMass() throws XPathParseException, NumberFormatException, XPathEvalException, NavException {
+		int coordinatesCount = 0;
+		double xTotal = 0;
+		double yTotal = 0;
+
+		coordinatesFinder.selectXPath(".//posList");
+		while (coordinatesFinder.evalXPath() != -1) {
+			long offsetAndLength = navigator.getContentFragment();
+			int coordinatesOffset = (int) offsetAndLength;
+			int coordinatesLength = (int) (offsetAndLength >> 32);
+			String posList = navigator.toRawString(coordinatesOffset, coordinatesLength);
+			String[] coordinates = posList.split(" ");
+			for (int k = 0; k < coordinates.length; k = k + 3) {
+				coordinatesCount++;
+				xTotal += Double.valueOf(coordinates[k]);
+				yTotal += Double.valueOf(coordinates[k + 1]);
+			}
+		}
+
+		double x = xTotal / coordinatesCount;
+		double y = yTotal / coordinatesCount;
+		Coordinate coord = new Coordinate(x, y);
+		return gf.createPoint(coord);
+	}
+
 	public String toString() {
 		try {
 			return navigator.toRawString(buildingOffset, buildingLength);

src/eu/simstadt/lowlevelgmlparser/CityGmlIterator.java

@@ -12,7 +12,7 @@
 import com.ximpleware.XPathParseException;
 
 
-public class CityGmlIterator implements Iterable<String>
+public class CityGmlIterator implements Iterable<BuildingXmlNode>
 {
 
 	private static final Logger LOGGER = Logger.getLogger(CityGmlIterator.class.getName());
@@ -34,8 +34,8 @@ public CityGmlIterator(Path citygmlPath)
 	}
 
 	@Override
-	public Iterator<String> iterator() {
-		Iterator<String> it = new Iterator<String>() {
+	public Iterator<BuildingXmlNode> iterator() {
+		Iterator<BuildingXmlNode> it = new Iterator<BuildingXmlNode>() {
 
 			@Override
 			public boolean hasNext() {
@@ -46,7 +46,7 @@ public boolean hasNext() {
 			}
 
 			@Override
-			public String next() {
+			public BuildingXmlNode next() {
 				try {
 					buildingsCount += 1;
 					if (buildingsCount % 1000 == 0) {
@@ -55,8 +55,7 @@ public String next() {
 					offsetAndLength = navigator.getElementFragment();
 					buildingOffset = (int) offsetAndLength;
 					buildingLength = (int) (offsetAndLength >> 32);
-					BuildingXmlNode b = new BuildingXmlNode(navigator, buildingOffset, buildingLength);
-					return b.toString();
+					return new BuildingXmlNode(navigator, buildingOffset, buildingLength);
 				} catch (NavException ex) {}
 				return null;
 			}

src/eu/simstadt/regionchooser/RegionExtractor.java

 package eu.simstadt.regionchooser;
 
 import java.io.IOException;
-import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.logging.Logger;
 import javax.xml.stream.XMLStreamException;
 import org.xml.sax.SAXParseException;
-import com.vividsolutions.jts.geom.Coordinate;
 import com.vividsolutions.jts.geom.Geometry;
-import com.vividsolutions.jts.geom.GeometryFactory;
 import com.vividsolutions.jts.geom.Point;
 import com.vividsolutions.jts.io.ParseException;
 import com.vividsolutions.jts.io.WKTReader;
-import com.ximpleware.AutoPilot;
 import com.ximpleware.NavException;
-import com.ximpleware.VTDGen;
-import com.ximpleware.VTDNav;
 import com.ximpleware.XPathEvalException;
 import com.ximpleware.XPathParseException;
+import eu.simstadt.lowlevelgmlparser.BuildingXmlNode;
 import eu.simstadt.lowlevelgmlparser.CityGmlIterator;
 
 
@@ -31,76 +26,28 @@ static public StringBuffer selectRegionDirectlyFromCityGML(Path citygmlPath, Str
 			throws SAXParseException, XMLStreamException, ParseException, XPathParseException, NavException,
 			NumberFormatException, XPathEvalException, IOException {
 
-		CityGmlIterator citygml = new CityGmlIterator(citygmlPath);
-
-		for (String lowLevelBuildingXML : citygml) {
-			System.out.println(lowLevelBuildingXML.length());
-		}
-
-		Geometry poly = wktReader.read(wktPolygon);
-		final GeometryFactory gf = new GeometryFactory();
-		StringBuffer sb = new StringBuffer();
-
-		int foundBuildingsCount = 0;
 		int buildingsCount = 0;
-		long offsetAndLength;
-		int buildingOffset = 0;
-		int buildingLength = 0;
-		int coordinatesOffset = 0;
-		int coordinatesLength = 0;
-		VTDGen parser = new VTDGen();
-		if (parser.parseFile(citygmlPath.toString(), false)) {
+		int foundBuildingsCount = 0;
+		StringBuffer sb = new StringBuffer();
+		Geometry poly = wktReader.read(wktPolygon);
 
-			VTDNav navigator = parser.getNav();
-			AutoPilot buildingsFinder = new AutoPilot(navigator);
-			buildingsFinder.selectXPath("//cityObjectMember");
-			while ((buildingsFinder.evalXPath()) != -1) {
-				AutoPilot coordinatesFinder = new AutoPilot(navigator);
-				coordinatesFinder.selectXPath(".//posList");
-				offsetAndLength = navigator.getElementFragment();
-				buildingOffset = (int) offsetAndLength;
-				buildingLength = (int) (offsetAndLength >> 32);
-				String cityObject = navigator.toRawString(buildingOffset, buildingLength);
-				// Add header
-				if (buildingsCount == 0) {
-					sb.append(navigator.toRawString(0, buildingOffset));
-				}
+		CityGmlIterator citygml = new CityGmlIterator(citygmlPath);
+		for (BuildingXmlNode buildingXmlNode : citygml) {
 			buildingsCount += 1;
 			if (buildingsCount % 1000 == 0) {
 				LOGGER.info("1000 buildings parsed");
 			}
-
-				int coordinatesCount = 0;
-				double xTotal = 0;
-				double yTotal = 0;
-
-				while (coordinatesFinder.evalXPath() != -1) {
-					offsetAndLength = navigator.getContentFragment();
-					coordinatesOffset = (int) offsetAndLength;
-					coordinatesLength = (int) (offsetAndLength >> 32);
-					String posList = navigator.toRawString(coordinatesOffset, coordinatesLength);
-					String[] coordinates = posList.split(" ");
-					for (int k = 0; k < coordinates.length; k = k + 3) {
-						coordinatesCount++;
-						xTotal += Double.valueOf(coordinates[k]);
-						yTotal += Double.valueOf(coordinates[k + 1]);
-					}
-				}
-
-				double x = xTotal / coordinatesCount;
-				double y = yTotal / coordinatesCount;
-				Coordinate coord = new Coordinate(x, y);
-				Point point = gf.createPoint(coord);
+			Point point = buildingXmlNode.getCenterOfMass();
 			if (point.within(poly)) {
 				foundBuildingsCount++;
-					sb.append(cityObject);
+				sb.append(buildingXmlNode.toString());
 			}
 		}
+
 		LOGGER.info("Buildings found in selected region " + foundBuildingsCount);
-			int footerOffset = buildingOffset + buildingLength;
-			int footerLength = (int) (Files.size(citygmlPath) - footerOffset);
-			sb.append(navigator.toRawString(footerOffset, footerLength));
-		}
+		//		int footerOffset = buildingOffset + buildingLength;
+		//		int footerLength = (int) (Files.size(citygmlPath) - footerOffset);
+		//		sb.append(navigator.toRawString(footerOffset, footerLength));
 
 		return sb;
 	}