XPathNodeIterator.java

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/*
 * Project: Server for annotations sharing
 * Subproject: Position of fragment of text in XML document
 * Author: Michael Angelov
 * Edited by: Ing. Jaroslav Dytrych idytrych@fit.vutbr.cz
 * File: XPathNodeIterator.java
 * Description: Exact XPath node iterator
 */

/**
 * @file XPathNodeIterator.java
 *
 * @brief Exact XPath 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;
import org.w3c.dom.Node;

/**
 * Exact XPath node iterator
 *
 * @brief Exact XPath node iterator
 * @author Michael Angelov
 */
public class XPathNodeIterator extends NodeIterator {

  /**
   * Overriden initialization method.
   *
   * @param document document whose nodes will be iterated through
   * @param expr expression according to which iterating will be provided
   */
  @Override
  public void init(Document document, XPathExpression expr) throws XPathExpressionException {
    this.document = document;
    this.nodeList = XPathHelper.evaluateXPath(document, expr);
    this.currentNodeIndex = 0;
  }

  /**
   * Overriden method for iterator's next node
   *
   * @return iterator's next node
   */
  @Override
  public Node nextNode() {
    return nodeList.item(currentNodeIndex++);

  }

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