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package com.monitorjbl.xlsx;

import com.monitorjbl.xlsx.exceptions.ParseException;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import java.io.IOException;
import java.io.InputStream;

public class XmlUtils {
  public static Document document(InputStream is) {
    try {
      DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

      factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
      factory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
      factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
      factory.setExpandEntityReferences(false);
      factory.setXIncludeAware(false);

      return factory.newDocumentBuilder().parse(is);
    } catch(SAXException | IOException | ParserConfigurationException e) {
      throw new ParseException(e);
    }
  }

  public static NodeList searchForNodeList(Document document, String xpath) {
    try {
      return (NodeList) XPathFactory.newInstance().newXPath().compile(xpath)
          .evaluate(document, XPathConstants.NODESET);
    } catch(XPathExpressionException e) {
      throw new ParseException(e);
    }
  }

}