package at.gv.egovernment.moa.util;

import java.util.ListIterator;

import org.w3c.dom.DOMException;
import org.w3c.dom.Node;
import org.w3c.dom.traversal.NodeFilter;
import org.w3c.dom.traversal.NodeIterator;

/**
 * A <code>NodeIterator</code> implementation based on a
 * <code>ListIterator</code>.
 * 
 * @see java.util.ListIterator
 * @see org.w3c.dom.traversal.NodeIterator
 * 
 * @author Patrick Peck
 * @version $Id$
 */
public class NodeIteratorAdapter implements NodeIterator {

  /** The <code>ListIterator</code> to wrap. */
  private ListIterator nodeIterator;

  /**
   * Create a new <code>NodeIteratorAdapter</code>.
   * @param nodeIterator The <code>ListIterator</code> to iterate over.
   */
  public NodeIteratorAdapter(ListIterator nodeIterator) {
    this.nodeIterator = nodeIterator;
  }

  /**
   * @see org.w3c.dom.traversal.NodeIterator#getRoot()
   */
  public Node getRoot() {
    return null;
  }

  /**
   * @see org.w3c.dom.traversal.NodeIterator#getWhatToShow()
   */
  public int getWhatToShow() {
    return NodeFilter.SHOW_ALL;
  }

  /**
   * @see org.w3c.dom.traversal.NodeIterator#getFilter()
   */
  public NodeFilter getFilter() {
    return null;
  }

  /**
   * @see org.w3c.dom.traversal.NodeIterator#getExpandEntityReferences()
   */
  public boolean getExpandEntityReferences() {
    return false;
  }

  /**
   * @see org.w3c.dom.traversal.NodeIterator#nextNode()
   */
  public Node nextNode() throws DOMException {
    if (nodeIterator.hasNext()) {
      return (Node) nodeIterator.next();
    }
    return null;
  }

  /**
   * @see org.w3c.dom.traversal.NodeIterator#previousNode()
   */
  public Node previousNode() throws DOMException {
    if (nodeIterator.hasPrevious()) {
      return (Node) nodeIterator.previous();
    }
    return null;
  }

  /**
   * @see org.w3c.dom.traversal.NodeIterator#detach()
   */
  public void detach() {
  }

}