package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

/* Remove duplicates. iter is assumed to be in document order. */

class UniqueNodeIterator implements NodeIterator {
  private NodeIterator iter;
  private Node lastNode = null;

  UniqueNodeIterator(NodeIterator iter) {
    this.iter = iter;
  }

  public Node next() throws XSLException {
    for (;;) {
      Node tem = iter.next();
      if (tem == null)
	break;
      if (!tem.equals(lastNode))
	return lastNode = tem;
    }
    return null;
  }
}