SequenceNodeIterator.java

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/*
 * Project: Server for annotations sharing
 * Subproject: Position of fragment of text in XML document
 * Author: Peter Bartoš
 * Edited by: Ing. Jaroslav Dytrych idytrych@fit.vutbr.cz
 * File: SequenceNodeIterator.java
 * Description: Sequence node iterator
 */

/**
 * @file SequenceNodeIterator.java
 *
 * @brief Sequence node iterator
 */

package cz.vutbr.fit.knot.annotations.fragmentUpdater.nodeIterators;

import cz.vutbr.fit.knot.annotations.fragmentUpdater.XPathHelper;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import org.w3c.dom.Document;

/**
 * Sequence node iterator
 *
 * @brief Sequence node iterator
 * @author Peter Bartoš
 */
public class SequenceNodeIterator extends RecursiveNodeIterator {

  /**
   * Overriden init() method
   *
   * @param document XML document whose nodes will be iterated through
   * @param expr expression according to which iterating will be provided, in this method is ignored, because sequence iterating is used
   */
  @Override
  public void init(Document document, XPathExpression expr) throws XPathExpressionException {

    timestamp = System.currentTimeMillis();

    this.document = document;
    this.nodeList = XPathHelper.evaluateXPath(document, expr);
    this.currentNodeIndex = 0;
    firstNode = true;

    nextNode = document.getDocumentElement();
    while (nextNode.hasChildNodes()) {
      nextNode = nextNode.getFirstChild();
    }
  }

  /**
   * Overriden toString() method
   *
   * @return string representation of class
   */
  @Override
  public String toString() {
    return "Sequence";
  }
}  // class SequenceNodeIterator