/* Copyright 2002-2025 CS GROUP
    * Licensed to CS GROUP (CS) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * CS 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.orekit.files.ccsds.utils.lexical;
  
  import java.net.MalformedURLException;
  
  import org.hamcrest.CoreMatchers;
  import org.hamcrest.MatcherAssert;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.orekit.data.DataSource;
  import org.orekit.errors.OrekitException;
  import org.orekit.errors.OrekitMessages;
  import org.orekit.files.ccsds.ndm.ParserBuilder;
  import org.orekit.files.ccsds.ndm.odm.ocm.OcmParser;
  
  public class XmlLexicalAnalyzerTest {
  
      @Test
      public void testNullBinary() {
          XmlLexicalAnalyzer la = new XmlLexicalAnalyzer(new DataSource("empty", (DataSource.StreamOpener) () -> null));
          try {
              la.accept(new ParserBuilder().buildOcmParser());
              Assertions.fail("an exception should have been thrown");
          } catch (OrekitException oe) {
              Assertions.assertEquals(OrekitMessages.UNABLE_TO_FIND_FILE, oe.getSpecifier());
              Assertions.assertEquals("empty", oe.getParts()[0]);
          }
      }
  
      @Test
      public void testNullCharacter() {
          XmlLexicalAnalyzer la = new XmlLexicalAnalyzer(new DataSource("empty", (DataSource.ReaderOpener) () -> null));
          try {
              la.accept(new ParserBuilder().buildOcmParser());
              Assertions.fail("an exception should have been thrown");
          } catch (OrekitException oe) {
              Assertions.assertEquals(OrekitMessages.UNABLE_TO_FIND_FILE, oe.getSpecifier());
              Assertions.assertEquals("empty", oe.getParts()[0]);
          }
      }
  
      /**
       * Check the XML parser is configured to ignore XML entities to avoid
       * security risks.
       */
      @Test
      public void testExternalResourcesAreIgnored() {
          // setup
          XmlLexicalAnalyzer la = new XmlLexicalAnalyzer(new DataSource(
                  "entity",
                  () -> this.getClass().getResourceAsStream("/ccsds/ndm/NDM-opm-entity.xml")));
          OcmParser parser = new ParserBuilder().buildOcmParser();
  
          // action
          try {
              la.accept(parser);
              // verify
              Assertions.fail("Expected Exception");
          } catch (OrekitException e) {
              // Malformed URL exception indicates external resource was disabled
              // file not found exception indicates parser tried to load the resource
              MatcherAssert.assertThat(e.getCause(),
                      CoreMatchers.instanceOf(MalformedURLException.class));
          }
      }
  
  }