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    * 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
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  package org.apache.maven.index.updater;
  
  import java.io.File;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.ServerSocket;
  import java.nio.file.Files;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.Properties;
  import java.util.TimeZone;
  
  import org.apache.maven.index.Java11HttpClient;
  import org.apache.maven.index.context.IndexingContext;
  import org.codehaus.plexus.util.FileUtils;
  import org.eclipse.jetty.server.Handler;
  import org.eclipse.jetty.server.Server;
  import org.eclipse.jetty.server.handler.DefaultHandler;
  import org.eclipse.jetty.server.handler.HandlerList;
  import org.eclipse.jetty.server.handler.ResourceHandler;
  import org.junit.Test;
  
  import static org.junit.Assert.assertTrue;
  
  public class DownloadRemoteIndexerManagerTest extends AbstractIndexUpdaterTest {
      private Server server;
  
      private File fakeCentral;
  
      private IndexingContext centralContext;
  
      @Override
      public void setUp() throws Exception {
          super.setUp();
  
          fakeCentral = new File(getBasedir(), "target/repos/fake-central");
          fakeCentral.mkdirs();
  
          // create proxy server
          ServerSocket s = new ServerSocket(0);
          int port = s.getLocalPort();
          s.close();
  
          server = new Server(port);
  
          ResourceHandler resource_handler = new ResourceHandler();
          resource_handler.setResourceBase(fakeCentral.getAbsolutePath());
          HandlerList handlers = new HandlerList();
          handlers.setHandlers(new Handler[] {resource_handler, new DefaultHandler()});
          server.setHandler(handlers);
  
          server.start();
  
          // make context "fake central"
          centralContext = indexer.addIndexingContext(
                  "central",
                  "central",
                  fakeCentral,
                  getDirectory("central"),
                  "http://localhost:" + port,
                  null,
                  MIN_CREATORS);
      }
  
      @Override
      public void tearDown() throws Exception {
          server.stop();
  
          FileUtils.forceDelete(fakeCentral);
  
          super.tearDown();
      }
  
      @Test
      public void testRepoReindex() throws Exception {
          IndexUpdateRequest iur;
  
          File index1 = new File(getBasedir(), "src/test/resources/repo-index/index");
          File index2 = new File(getBasedir(), "src/test/resources/repo-index/index2");
          File centralIndex = new File(fakeCentral, ".index");
  
         // copy index 02
         overwriteIndex(index2, centralIndex);
 
         iur = new IndexUpdateRequest(centralContext, new Java11HttpClient());
         iur.setForceFullUpdate(true);
 
         updater.fetchAndUpdateIndex(iur);
 
         searchFor("org.sonatype.nexus", 8, centralContext);
 
         // copy index 01
         overwriteIndex(index1, centralIndex);
 
         iur = new IndexUpdateRequest(centralContext, new Java11HttpClient());
         iur.setForceFullUpdate(true);
         // just a dummy filter to invoke filtering! -- this is what I broke unnoticing it
         iur.setDocumentFilter(doc -> true);
 
         updater.fetchAndUpdateIndex(iur);
 
         searchFor("org.sonatype.nexus", 1, centralContext);
 
         // copy index 02
         overwriteIndex(index2, centralIndex);
 
         iur = new IndexUpdateRequest(centralContext, new Java11HttpClient());
         iur.setForceFullUpdate(true);
 
         updater.fetchAndUpdateIndex(iur);
 
         searchFor("org.sonatype.nexus", 8, centralContext);
     }
 
     private void overwriteIndex(File source, File destination) throws Exception {
         File indexFile = new File(destination, "nexus-maven-repository-index.gz");
         File indexProperties = new File(destination, "nexus-maven-repository-index.properties");
 
         long lastMod = -1;
         if (destination.exists()) {
             FileUtils.forceDelete(destination);
             lastMod = indexFile.lastModified();
         }
         FileUtils.copyDirectory(source, destination);
         long lastMod2 = indexFile.lastModified();
         assertTrue(lastMod < lastMod2);
 
         Properties p = new Properties();
         try (InputStream input = Files.newInputStream(indexProperties.toPath())) {
             p.load(input);
         }
 
         p.setProperty("nexus.index.time", format(new Date()));
         p.setProperty("nexus.index.timestamp", format(new Date()));
 
         try (OutputStream output = Files.newOutputStream(indexProperties.toPath())) {
             p.store(output, null);
         }
     }
 
     private String format(Date d) {
         SimpleDateFormat df = new SimpleDateFormat(IndexingContext.INDEX_TIME_FORMAT);
         df.setTimeZone(TimeZone.getTimeZone("GMT"));
         return df.format(d);
     }
 }