Java by API/javax.xml.stream/EventFilter

implements EventFilter

  

import java.io.File;
import java.io.FileInputStream;
import javax.xml.stream.EventFilter;
import javax.xml.stream.StreamFilter;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.events.XMLEvent;
public class Main {
  public static void main(String[] args) throws Exception {
    XMLInputFactory inputFactory = XMLInputFactory.newInstance();
    XMLStreamReader reader = inputFactory.createXMLStreamReader(new FileInputStream(new File("test.xml")));
    System.out.println(countEvents(reader));
    reader = inputFactory.createXMLStreamReader(new FileInputStream(new File("test.xml")));
    StreamFilter filter = new ElementOnlyFilter();
    reader = inputFactory.createFilteredReader(reader, filter);
    System.out.println(countEvents(reader));
  }
  private static int countEvents(XMLStreamReader reader) throws XMLStreamException {
    int counter = 1;
    while (reader.hasNext()) {
      reader.next();
      counter++;
    }
    return counter;
  }
}
class ElementOnlyFilter implements EventFilter, StreamFilter {
  public boolean accept(XMLEvent event) {
    return accept(event.getEventType());
  }
  public boolean accept(XMLStreamReader reader) {
    return accept(reader.getEventType());
  }
  private boolean accept(int eventType) {
    return eventType == XMLStreamConstants.START_ELEMENT
        || eventType == XMLStreamConstants.END_ELEMENT;
  }
}