geotools-gt2-users

[paul m. <pau...@sa...>]

Hi Ive sent this question before but it was unreadable

I saw your VPF snippet about reading VPF geometries on codehaus.

I just found out of Geotools And I can't say that I'm a java programmer only
a GIS engineer, but I copied 

your snippet code for learning (hope it is ok). Never the less I had to
modify it because I can't import  

org.geotools.data.DefaultFeatureResults;,

just can't find it.

My database is VMap level 0 euroasia 

This is the code for now:

import java.io.File;
import org.geotools.data.DataStore;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.data.FeatureSource;
import org.geotools.feature.Feature;
import com.vividsolutions.jts.geom.Geometry;

public class  VPFTest
{
public static void main( String[] args )
    throws Exception
  {
    if ( args.length != 1 )
    {
      System.err.println( "Usage: java " + VPFTest.class.getName() + " <VPF
directory containing lht file>" );
      System.exit( 1 );
    }

    DataStore ds = new org.geotools.data.vpf.VPFLibrary( new File( args[0] )
);
    String[] types = ds.getTypeNames();
    for ( int i = 0; i < types.length; i++ )
      runThrough( ds, types[i] );
  }


static void runThrough( DataStore ds, String feature )
throws Exception
  {

    FeatureIterator fi = null;
    FeatureCollection fc =null;
	FeatureSource fs = null;
    try
    {
    	fs = ds.getFeatureSource( feature );
    	fc = fs.getFeatures();
    	fi = fc.features();
    	while (fi.hasNext()) // here I'm getting the exception the second time
I enter runThrough()
    	{
    		Feature f = fi.next();
    		Geometry g = f.getDefaultGeometry();
    		if ( g == null )
    			System.out.println( "Default Geometry is null for: " + f );
    		else
    			System.out.println( "Default Geometry for: " + f );
	     }

    }
    finally
    {
    	if(fi != null) fi.close();
    }
  }
}

And this is the output:
Default Geometry is null for: Feature[ id=923 , id=923 , f_code=BA010 ,
edg_id=923 , libref.lft_id=null , start_node=null , end_node=null ,
right_edge=null , left_edge=null , coordinates=null ]
Default Geometry is null for: Feature[ id=924 , id=924 , f_code=BA010 ,
edg_id=924 , libref.lft_id=null , start_node=null , end_node=null ,
right_edge=null , left_edge=null , coordinates=null ]
Default Geometry is null for: Feature[ id=925 , id=925 , f_code=BA010 ,
edg_id=925 , libref.lft_id=null , start_node=null , end_node=null ,
right_edge=null , left_edge=null , coordinates=null ]

ALL coordinates are null.

Then when program moves to the next featur type and enter runThrough fc, fs,
fi seems ok but fi.hasNext()
reports this:
java.io.IOException: The handle is invalid
	at java.io.RandomAccessFile.length(Native Method)
	at org.geotools.data.vpf.file.VPFFile.hasNext(VPFFile.java:492)
	at
org.geotools.data.vpf.VPFFeatureReader.readNext(VPFFeatureReader.java:142)
	at
org.geotools.data.vpf.VPFFeatureReader.hasNext(VPFFeatureReader.java:114)
	at
org.geotools.data.ReTypeFeatureReader.hasNext(ReTypeFeatureReader.java:164)
	at
org.geotools.data.store.FeatureReaderIterator.hasNext(FeatureReaderIterator.java:44)
	at
org.geotools.feature.collection.DelegateFeatureIterator.hasNext(DelegateFeatureIterator.java:50)
	at VPFTest.runThrough(VPFTest.java:99)
	at VPFTest.main(VPFTest.java:83)

I would really like to be able to read the geometries for all features in a
VPF database, is it possible with geotools?

Paul Malm

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