/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.maven.plugins.site.run;
  
  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.junit.Test;
  import org.w3c.dom.Document;
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  public class WebXmlTest {
  
      @Test
      public void testFilters() throws Exception {
          DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
          Document doc = docBuilder.parse(SiteRunMojo.class.getResourceAsStream("/run/web.xml"));
          XPath xPath = XPathFactory.newInstance().newXPath();
  
          NodeList filterClasses =
                  (NodeList) xPath.compile("/web-app/filter/filter-class").evaluate(doc, XPathConstants.NODESET);
  
          assertTrue("Expected at least one filter", filterClasses.getLength() > 0);
          for (int index = 0; index < filterClasses.getLength(); index++) {
              Node filterClass = filterClasses.item(index).getFirstChild();
              try {
                  Class.forName(filterClass.getNodeValue());
              } catch (ClassNotFoundException cnfe) {
                  fail("/web-app/filter[" + index + "]/filter-class refers to " + filterClass.getNodeValue()
                          + ", which doesn't exist");
              }
          }
      }
  }