/*
    * 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.wrapper;
  
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.lang.reflect.Method;
  import java.net.URL;
  import java.net.URLClassLoader;
  import java.nio.file.DirectoryStream;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.Iterator;
  import java.util.Locale;
  
  /**
   * Maven starter, from a provided Maven home directory.
   *
   * @author Hans Dockter
   */
  public class BootstrapMainStarter {
      public void start(String[] args, Path mavenHome) throws Exception {
          final Path mavenJar = findLauncherJar(mavenHome);
          URLClassLoader contextClassLoader = new URLClassLoader(
                  new URL[] {mavenJar.toUri().toURL()},
                  ClassLoader.getSystemClassLoader().getParent());
          Thread.currentThread().setContextClassLoader(contextClassLoader);
          Class<?> mainClass = contextClassLoader.loadClass("org.codehaus.plexus.classworlds.launcher.Launcher");
  
          System.setProperty("maven.home", mavenHome.toAbsolutePath().toString());
          System.setProperty(
                  "classworlds.conf",
                  mavenHome.resolve("bin/m2.conf").toAbsolutePath().toString());
  
          Method mainMethod = mainClass.getMethod("main", String[].class);
          mainMethod.invoke(null, new Object[] {args});
      }
  
      private Path findLauncherJar(Path mavenHome) throws IOException {
          final Path mavenBoot = mavenHome.resolve("boot");
          if (Files.isDirectory(mavenBoot)) {
              try (DirectoryStream<Path> ds = Files.newDirectoryStream(mavenBoot, "plexus-classworlds-*.jar")) {
                  Iterator<Path> iterator = ds.iterator();
                  if (iterator.hasNext()) {
                      return iterator.next();
                  }
              }
          }
          throw new FileNotFoundException(String.format(
                  Locale.ROOT, "Could not locate the Maven launcher JAR" + " in Maven distribution '%s'.", mavenHome));
      }
  }