[Geotools-gt2-users] create new shapefile and add features.

[Wladimir S. <bo...@gm...>]

Hi,

 I am creating an Web application to edit shapefiles online. The shapefiles
can be points, lines or polygons. I would like to know as I can create new
shapefile of these types.

For this I use the following code:


************************************** CODE
***************************************************

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.JFileChooser;

import org.geotools.data.DataUtilities;
import org.geotools.data.DefaultQuery;
import org.geotools.data.FeatureReader;
import org.geotools.data.FeatureResults;
import org.geotools.data.FeatureSource;
import org.geotools.data.FeatureStore;
import org.geotools.data.Transaction;
import org.geotools.data.shapefile.ShapefileDataStore;

import org.geotools.filter.*;

import org.geotools.factory.FactoryRegistryException;
import org.geotools.feature.AttributeTypeFactory;
import org.geotools.feature.AttributeType;
import org.geotools.feature.FeatureType;
import org.geotools.feature.FeatureTypeFactory;
import org.geotools.feature.Feature;
import org.geotools.feature.IllegalAttributeException;
import org.geotools.feature.SchemaException;
import org.geotools.graph.util.SimpleFileFilter;

import com.vividsolutions.jts.io.ParseException;
import com.vividsolutions.jts.io.WKTReader;
import com.vividsolutions.jts.geom.*;


public class EscriuSHP {

 public static void main(String[] args) throws FactoryRegistryException,
SchemaException, IOException, ParseException, IllegalAttributeException {
  String rutaSHP = "c:/datos/";
  String nomSHP = "test";
  String tipusSHP = "LINE";
  String[] nomsCamps = {"ID", "NOMBRE", "CASA"};
  String[] valorsCamps = {"1","Felipa","25"};
  String[] cX = {"0","2","2","0"};
  String[] cY = {"0","0","2","2"};
  createSHP(rutaSHP, nomSHP, tipusSHP, nomsCamps);
  //addFeature(rutaSHP, nomSHP, tipusSHP, nomsCamps, valorsCamps, cX, cY);
 }

 private static int createSHP(String rutaSHP, String nomSHP, String
tipusSHP, String[] nomsCamps) throws FactoryRegistryException,
SchemaException, ParseException, IllegalAttributeException, IOException {
  String URI = rutaSHP + nomSHP + ".shp";
  //feature : type creation
  AttributeType geom;
  if (tipusSHP.equalsIgnoreCase("LINE")){
   geom = AttributeTypeFactory.newAttributeType("the_geom", LineString.class
);
  }
  else if(tipusSHP.equalsIgnoreCase("POINT")){
   geom = AttributeTypeFactory.newAttributeType("the_geom", Point.class);
  }
  else if(tipusSHP.equalsIgnoreCase("POLYGON")){
   geom = AttributeTypeFactory.newAttributeType("the_geom", Polygon.class);
  }
  else{
   return 0;
  }
  AttributeType[] camps = new AttributeType[nomsCamps.length + 1];
  camps[0] = geom;
  for (int i = 1 ; i < camps.length; i++){
   camps[i] = AttributeTypeFactory.newAttributeType(nomsCamps[i-1],
String.class);
  }
  FeatureType ftRoad = FeatureTypeFactory.newFeatureType(camps, nomSHP);

  // datastore creation
  URL anURL = (new File(URI)).toURL();
  ShapefileDataStore datastore = new ShapefileDataStore(anURL);
  datastore.createSchema(ftRoad);

  return 1;
 }
}

************************************** END CODE
***************************************************
*This method creates the shapefile correctly. When I open with the Arcview
3.x it shows the correct type of geometry and all the fields. *
**
**
*Soon I want to add Features to the created shapefile. *
**
*For this I use the following code: *
**

************************************** CODE
***************************************************

public static int addFeature(String rutaSHP, String nomSHP, String tipusSHP,
String[] nomsCamps, String[] valorsCamps, String[] cX, String[] cY) throws
FactoryRegistryException, SchemaException, ParseException,
IllegalAttributeException, IOException{
  String URI = rutaSHP + nomSHP + ".shp";

  AttributeType geom;
  if (tipusSHP.equalsIgnoreCase("LINE")){
   geom = AttributeTypeFactory.newAttributeType("the_geom", LineString.class
);
  }
  else if(tipusSHP.equalsIgnoreCase("POINT")){
   geom = AttributeTypeFactory.newAttributeType("the_geom", Point.class);
  }
  else if(tipusSHP.equalsIgnoreCase("POLYGON")){
   geom = AttributeTypeFactory.newAttributeType("the_geom", Polygon.class);
  }
  else{
   return 0;
  }
  AttributeType[] camps = new AttributeType[nomsCamps.length + 1];
  camps[0] = geom;
  for (int i = 1 ; i < camps.length; i++){
   camps[i] = AttributeTypeFactory.newAttributeType(nomsCamps[i-1],
String.class);
  }
  FeatureType ftRoad = FeatureTypeFactory.newFeatureType(camps, "road");

  // feature : instance attribute creation
  WKTReader wktReader = new WKTReader();

  Object geometry = null;
  if (tipusSHP.equalsIgnoreCase("LINE")){
   geometry = (LineString) wktReader.read("LINESTRING (10 10, 20 20)");
  }
  else if(tipusSHP.equalsIgnoreCase("POINT")){
   geometry = (Point) wktReader.read("POINT (10 10)");
  }
  else if(tipusSHP.equalsIgnoreCase("POLYGON")){
   geometry = (Polygon) wktReader.read("POLYGON (10 10, 20 10, 20 20, 10 20,
10 10)");
  }
  else{
   return 0;
  }
  Object[] valors = new Object[valorsCamps.length + 1];
  valors[0] = geometry;
  for (int i = 1 ; i < valorsCamps.length+1; i++){
   System.out.println(valorsCamps[i-1]);
   valors[i] = valorsCamps[i-1];
  }

  for (int j = 0 ; j < valors.length; j++){
   System.out.println("VALOR " + j + " : " + valors[j]);
  }

  Feature theRoad = ftRoad.create(valors, "MyRoad");

  // getting the feature
  URL anURL = (new File(URI)).toURL();
  ShapefileDataStore datastore = new ShapefileDataStore(anURL);
  String featureName = datastore.getTypeNames()[0]; // road
  FeatureSource source = datastore.getFeatureSource(featureName);

  // appending feature, this will automatically append to the end of
shapefile
  FeatureStore featureStore = (FeatureStore) (datastore.getFeatureSource
(featureName));
  FeatureReader aReader = DataUtilities.reader(new Feature[] { theRoad });
  featureStore.addFeatures(aReader);
  return 1;
 }

************************************** END CODE
***************************************************

*When attempt to add Features, gives the following error*

******************************** ERROR
************************************************

29/01/2007 12:06:54 org.geotools.data.shapefile.ShapefileDataStoreopenPrjReader
WARNING: projection (.prj) for shapefile: file:/c:/datos/test.shp is not
available
29/01/2007 12:06:54 org.geotools.data.shapefile.ShapefileDataStoreopenPrjReader
WARNING: projection (.prj) for shapefile: file:/c:/datos/test.shp is not
available
java.lang.NullPointerException
 at org.geotools.data.shapefile.ShapefileDataStore$Writer.write(
ShapefileDataStore.java:1595)
 at org.geotools.data.shapefile.ShapefileDataStore$Writer.close(
ShapefileDataStore.java:1471)
 at org.geotools.data.InProcessLockingManager$1.close(
InProcessLockingManager.java:343)
 at org.geotools.data.AbstractFeatureStore.addFeatures(
AbstractFeatureStore.java:231)
 at EscriuSHP.addFeature(EscriuSHP.java:139)
 at EscriuSHP.main(EscriuSHP.java:44)
Exception in thread "main"

 ************************************ END ERROR
***************************************

It would thank for much its aid and if is possible an example of code of
like creating a new shapefile and add features.

thanks,

BOLO