OpenJump, Beanshell - getAttribute(s)Stats

{
  import com.vividsolutions.jump.workbench.ui.*;
  import java.util.*;

  Layer layer = wc.getLayerManager().getLayer("teszt");
  if (layer == null) { print ("Layer not found"); return; }

  FeatureSchema schema = layer.getFeatureCollectionWrapper().getFeatureSchema();


  //int zData = schema.getAttributeIndex("LAYER");
  //print("\nLAYER index: " + zData + " (" + schema.getAttributeType("LAYER") + ")");


  //print("Attributes of schema:");
  //for(int i=0;i<schema.getAttributeCount();i++){
  //  print("   "+i+" "+schema.getAttributeName(i));
  //}


  Hashtable keys = new Hashtable();
  Iterator iter = layer.getFeatureCollectionWrapper().iterator();
  String layerName = "LAYER";
  int layerIndex = schema.getAttributeIndex(layerName);
  while ( iter.hasNext() ) {
    BasicFeature bf = (BasicFeature)iter.next();
    if(!keys.containsKey(bf.getAttribute(layerIndex))){
      keys.put(bf.getAttribute(layerIndex),1);
    } else {
      keys.put( bf.getAttribute(layerIndex), keys.get(bf.getAttribute(layerIndex))+1);
    }
  }
  print("Statistics of '" + layerName + "' attributes:\n" + keys);


  Hashtable attributes = new Hashtable();
  for(int i=0;i<schema.getAttributeCount();i++){
    print("   "+i+" "+schema.getAttributeName(i)+ " (" + schema.getAttributeType("LAYER") + ")");
    if(!attributes.containsKey(schema.getAttributeName(i))){
      attributes.put(schema.getAttributeName(i),new Hashtable());
    }
    Hashtable keys = new Hashtable();
    Iterator iter = layer.getFeatureCollectionWrapper().iterator();
    while ( iter.hasNext() ) {
      BasicFeature bf = (BasicFeature)iter.next();
      if(bf.getAttribute(i)!=null){
        if(!keys.containsKey(bf.getAttribute(i))){
            keys.put(bf.getAttribute(i),1);
        } else {
          keys.put( bf.getAttribute(i), keys.get(bf.getAttribute(i))+1);
        }
      }
    }
    print(keys);
    keys.clear();
  }


}