ClassPathTest.java 文件源码

private void doTestExistsThrowsSecurityException() throws IOException, URISyntaxException {
  URLClassLoader myLoader = (URLClassLoader) getClass().getClassLoader();
  URL[] urls = myLoader.getURLs();
  ImmutableList.Builder<File> filesBuilder = ImmutableList.builder();
  for (URL url : urls) {
    if (url.getProtocol().equalsIgnoreCase("file")) {
      filesBuilder.add(new File(url.toURI()));
    }
  }
  ImmutableList<File> files = filesBuilder.build();
  assertThat(files).isNotEmpty();
  SecurityManager disallowFilesSecurityManager = new SecurityManager() {
    @Override
    public void checkPermission(Permission p) {
      if (p instanceof FilePermission) {
        throw new SecurityException("Disallowed: " + p);
      }
    }
  };
  System.setSecurityManager(disallowFilesSecurityManager);
  try {
    files.get(0).exists();
    fail("Did not get expected SecurityException");
  } catch (SecurityException expected) {
  }
  ClassPath classPath = ClassPath.from(myLoader);
  assertThat(classPath.getResources()).isEmpty();
}