package org.opentrafficsim.demo;
   
   import java.io.File;
   import java.io.FileInputStream;
   import java.io.IOException;
   import java.io.InputStream;
   
   import javax.xml.parsers.DocumentBuilder;
   import javax.xml.parsers.DocumentBuilderFactory;
  import javax.xml.xpath.XPath;
  import javax.xml.xpath.XPathConstants;
  import javax.xml.xpath.XPathFactory;
  
  import org.djutils.io.ResourceResolver;
  import org.w3c.dom.Document;
  import org.w3c.dom.NamedNodeMap;
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  import org.xml.sax.EntityResolver;
  import org.xml.sax.InputSource;
  
  /**
   * ParseXml.java.
   * <p>
   * Copyright (c) 2022-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * </p>
   * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
   * @author <a href="https://github.com/peter-knoppers">Peter Knoppers</a>
   * @author <a href="https://github.com/wjschakel">Wouter Schakel</a>
   */
  public class ParseXml
  {
      /**
       * Make a DOM tree and do some xpath.
       * @throws Exception exception
       */
      public ParseXml() throws Exception
      {
          domTree(ResourceResolver.resolve("/resources/conflict/Simple.xml").asUrl().getPath());
      }
  
      /**
       * Print dom tree.
       * @param path path
       * @throws Exception exception
       */
      private void domTree(final String path) throws Exception
      {
          File file = new File(path);
          FileInputStream fileIS = new FileInputStream(file);
          DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
          builderFactory.setXIncludeAware(true);
          builderFactory.setValidating(false); // no DTD validation
          // builderFactory.setFeature("http://apache.org/xml/features/validation/schema", true);
          // builderFactory.setFeature("http://apache.org/xml/features/validation/schema-full-checking", true);
          // builderFactory.setFeature("http://apache.org/xml/features/validation/id-idref-checking", true);
          // builderFactory.setFeature("http://apache.org/xml/features/validation/identity-constraint-checking", true);
          // builderFactory.setFeature("http://apache.org/xml/features/xinclude", true);
          builderFactory.setNamespaceAware(true);
          DocumentBuilder builder = builderFactory.newDocumentBuilder();
          builder.setEntityResolver(new DefaultsResolver());
          Document xmlDocument = builder.parse(fileIS);
          print(xmlDocument, "*");
          print(xmlDocument, "*/ots:Ots");
          print(xmlDocument, ".//ots:GTUTYPE");
      }
  
      /**
       * Print document.
       * @param xmlDocument document
       * @param expression expression
       * @throws Exception exception
       */
      private void print(final Document xmlDocument, final String expression) throws Exception
      {
          XPath xPath = XPathFactory.newInstance().newXPath();
          NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
          System.out.print(expression + " = [ ");
          boolean first = true;
          for (int i = 0; i < nodeList.getLength(); i++)
          {
              if (first)
              {
                  first = false;
              }
              else
              {
                  System.out.print(", ");
              }
              Node n = nodeList.item(i);
              System.out.print("{" + n.getNodeName());
              NamedNodeMap attMap = n.getAttributes();
              if (attMap != null)
              {
                  boolean f2 = true;
                  for (int j = 0; j < attMap.getLength(); j++)
                  {
                      if (f2)
                     {
                         f2 = false;
                     }
                     else
                     {
                         System.out.print(":");
                     }
                     System.out.print(" " + attMap.item(j).getNodeName() + "=" + attMap.item(j).getNodeValue());
                 }
             }
             System.out.print("}");
         }
         System.out.println(" ]");
     }
 
     /**
      * Main method.
      * @param args args
      * @throws Exception exception
      */
     public static void main(final String[] args) throws Exception
     {
         new ParseXml();
     }
 
     /**
      * Defaults resolver.
      */
     static class DefaultsResolver implements EntityResolver
     {
         /**
          * Constructor.
          */
         DefaultsResolver()
         {
             //
         }
 
         @Override
         public InputSource resolveEntity(final String publicId, final String systemId) throws IOException
         {
             if (systemId.contains("defaults/"))
             {
                 System.out.println("\nINCLUDING " + systemId);
                 String location = "/resources/xsd/defaults" + systemId.substring(systemId.lastIndexOf('/'));
                 InputStream stream = ResourceResolver.resolve(location).openStream();
                 return new InputSource(stream);
             }
             else
             {
                 return new InputSource(ResourceResolver.resolve(systemId).openStream());
             }
         }
     }
 
 }