code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed 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 io.reactivex.rxjava3.validators;
  
  import java.io.*;
  import java.util.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  /**
   * Adds license header to java files.
   */
  public class FixLicenseHeaders {
  
      String[] header = {
      "/*",
      " * Copyright (c) 2016-present, RxJava Contributors.",
      " *",
      " * Licensed 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.",
      " */",
      ""
      };
  
      @Test
      public void checkAndUpdateLicenses() throws Exception {
          if (System.getenv("CI") != null) {
              // no point in changing the files in CI
              return;
          }
          File f = TestHelper.findSource("Flowable");
          if (f == null) {
              return;
          }
  
          Queue<File> dirs = new ArrayDeque<>();
  
          File parent = f.getParentFile().getParentFile();
          dirs.offer(parent);
          dirs.offer(new File(parent.getAbsolutePath().replace('\\', '/').replace("src/main/java", "src/perf/java")));
          dirs.offer(new File(parent.getAbsolutePath().replace('\\', '/').replace("src/main/java", "src/test/java")));
  
          StringBuilder fail = new StringBuilder();
  
          while (!dirs.isEmpty()) {
              f = dirs.poll();
  
              File[] list = f.listFiles();
              if (list != null && list.length != 0) {
  
                  for (File u : list) {
                      if (u.isDirectory()) {
                          dirs.offer(u);
                      } else {
                          if (u.getName().endsWith(".java")) {
  
                              List<String> lines = new ArrayList<>();
                              BufferedReader in = new BufferedReader(new FileReader(u));
                              try {
                                  for (;;) {
                                      String line = in.readLine();
                                      if (line == null) {
                                          break;
                                      }
  
                                      lines.add(line);
                                  }
                              } finally {
                                  in.close();
                              }
  
                              if (!lines.get(0).equals(header[0]) || !lines.get(1).equals(header[1])) {
                                  fail.append("java.lang.RuntimeException: missing header added, refresh and re-run tests!\r\n")
                                  .append(" at ")
                                  ;
  
                                  String fn = u.toString().replace('\\', '/');
  
                                  int idx = fn.indexOf("io/reactivex/");
  
                                  fn = fn.substring(idx).replace('/', '.').replace(".java", "");
  
                                  fail.append(fn).append(" (")
                                  ;
  
                                  int jdx = fn.lastIndexOf('.');
  
                                  fail.append(fn.substring(jdx + 1));
  
                                  fail.append(".java:1)\r\n\r\n");
  
                                  lines.addAll(0, Arrays.asList(header));
  
                                  PrintWriter w = new PrintWriter(new FileWriter(u));
  
                                  try {
                                      for (String s : lines) {
                                          w.println(s);
                                      }
                                  } finally {
                                      w.close();
                                  }
                              }
                          }
                      }
                  }
              }
          }
  
          if (fail.length() != 0) {
              System.out.println(fail);
              throw new AssertionError(fail.toString());
          }
      }
  }
  