content: /*
   * 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.beam.sdk.io;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.containsInAnyOrder;
  import static org.hamcrest.Matchers.equalTo;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotEquals;
  import static org.junit.Assert.assertThrows;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assume.assumeFalse;
  import static org.mockito.Mockito.any;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.Reader;
  import java.io.Writer;
  import java.nio.channels.Channels;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.NoSuchFileException;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.Collections;
  import java.util.List;
  import org.apache.beam.sdk.io.fs.CreateOptions.StandardCreateOptions;
  import org.apache.beam.sdk.io.fs.MatchResult;
  import org.apache.beam.sdk.io.fs.ResolveOptions.StandardResolveOptions;
  import org.apache.beam.sdk.testing.RestoreSystemProperties;
  import org.apache.beam.sdk.util.MimeTypes;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.FluentIterable;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Lists;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.io.Files;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.io.LineReader;
  import org.apache.commons.lang3.SystemUtils;
  import org.hamcrest.Matchers;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.rules.TemporaryFolder;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.mockito.MockedStatic;
  import org.mockito.Mockito;
  
  /** Tests for {@link LocalFileSystem}. */
  @RunWith(JUnit4.class)
  public class LocalFileSystemTest {
    @Rule public ExpectedException thrown = ExpectedException.none();
    @Rule public TemporaryFolder temporaryFolder = new TemporaryFolder();
    @Rule public RestoreSystemProperties restoreSystemProperties = new RestoreSystemProperties();
    private LocalFileSystem localFileSystem = new LocalFileSystem();
  
    @Test
    public void testCreateWithExistingFile() throws Exception {
      File existingFile = temporaryFolder.newFile();
      testCreate(existingFile.toPath());
    }
  
    @Test
    public void testCreateWithinExistingDirectory() throws Exception {
      testCreate(temporaryFolder.getRoot().toPath().resolve("file.txt"));
    }
  
    @Test
    public void testCreateWithNonExistentSubDirectory() throws Exception {
      testCreate(temporaryFolder.getRoot().toPath().resolve("non-existent-dir").resolve("file.txt"));
    }
  
    @Test
    public void testCreateFilesException() throws Exception {
      File mockParentFile = mock(File.class);
      when(mockParentFile.mkdirs()).thenThrow(new RuntimeException("exception when creating files"));
  
      File mockAbsoluteFile = mock(File.class);
      when(mockAbsoluteFile.getParentFile()).thenReturn(mockParentFile);
  
      File mockFile = mock(File.class);
      when(mockFile.getAbsoluteFile()).thenReturn(mockAbsoluteFile);
  
      Path mockPath = mock(Path.class);
      when(mockPath.toFile()).thenReturn(mockFile);
  
      LocalResourceId mockResourceId = mock(LocalResourceId.class);
      when(mockResourceId.getPath()).thenReturn(mockPath);
  
      thrown.expect(RuntimeException.class);
  
      localFileSystem.create(
          mockResourceId, StandardCreateOptions.builder().setMimeType(MimeTypes.TEXT).build());
    }
  
    private void testCreate(Path path) throws Exception {
      String expected = "my test string";
      // First with the path string
      createFileWithContent(path, expected);
      assertThat(
          Files.readLines(path.toFile(), StandardCharsets.UTF_8), containsInAnyOrder(expected));
  
      // Delete the file before trying as URI
      assertTrue("Unable to delete file " + path, path.toFile().delete());
  
      // Second with the path URI
      createFileWithContent(Paths.get(path.toUri()), expected);
      assertThat(
          Files.readLines(path.toFile(), StandardCharsets.UTF_8), containsInAnyOrder(expected));
    }
  
    @Test
    public void testReadWithExistingFile() throws Exception {
      String expected = "my test string";
      File existingFile = temporaryFolder.newFile();
      Files.asCharSink(existingFile, StandardCharsets.UTF_8).write(expected);
      String data;
      try (Reader reader =
          Channels.newReader(
              localFileSystem.open(
                  LocalResourceId.fromPath(existingFile.toPath(), false /* isDirectory */)),
              StandardCharsets.UTF_8.name())) {
        data = new LineReader(reader).readLine();
      }
      assertEquals(expected, data);
    }
  
    @Test
    public void testReadNonExistentFile() throws Exception {
      thrown.expect(FileNotFoundException.class);
      localFileSystem
          .open(
              LocalResourceId.fromPath(
                  temporaryFolder.getRoot().toPath().resolve("non-existent-file.txt"),
                  false /* isDirectory */))
          .close();
    }
  
    private void assertContents(List<Path> destFiles, List<String> contents) throws Exception {
      for (int i = 0; i < destFiles.size(); ++i) {
        assertThat(
            Files.readLines(destFiles.get(i).toFile(), StandardCharsets.UTF_8),
            containsInAnyOrder(contents.get(i)));
      }
    }
  
    @Test
    public void testCopyWithExistingSrcFile() throws Exception {
      Path srcPath1 = temporaryFolder.newFile().toPath();
      Path srcPath2 = temporaryFolder.newFile().toPath();
  
      Path destPath1 = temporaryFolder.getRoot().toPath().resolve("nonexistentdir").resolve("dest1");
      Path destPath2 = srcPath2.resolveSibling("dest2");
  
      createFileWithContent(srcPath1, "content1");
      createFileWithContent(srcPath2, "content2");
  
      localFileSystem.copy(
          toLocalResourceIds(ImmutableList.of(srcPath1, srcPath2), false /* isDirectory */),
          toLocalResourceIds(ImmutableList.of(destPath1, destPath2), false /* isDirectory */));
  
      assertContents(
          ImmutableList.of(destPath1, destPath2), ImmutableList.of("content1", "content2"));
    }
  
    @Test
    public void testCopyWithNonExistingSrcFile() throws Exception {
      thrown.expect(NoSuchFileException.class);
  
      Path existentSrc = temporaryFolder.newFile().toPath();
      Path nonExistentSrc = temporaryFolder.getRoot().toPath().resolve("non-existent-file.txt");
  
      Path destPath1 = temporaryFolder.getRoot().toPath().resolve("nonexistentdir").resolve("dest1");
      Path destPath2 = destPath1.resolveSibling("dest2");
  
      createFileWithContent(existentSrc, "content");
  
      localFileSystem.copy(
          toLocalResourceIds(ImmutableList.of(existentSrc, nonExistentSrc), false /* isDirectory */),
          toLocalResourceIds(ImmutableList.of(destPath1, destPath2), false /* isDirectory */));
    }
  
    @Test
    public void testMoveWithExistingSrcFile() throws Exception {
      Path srcPath1 = temporaryFolder.newFile().toPath();
      Path srcPath2 = temporaryFolder.newFile().toPath();
  
      Path destPath1 = temporaryFolder.getRoot().toPath().resolve("nonexistentdir").resolve("dest1");
      Path destPath2 = srcPath2.resolveSibling("dest2");
  
      createFileWithContent(srcPath1, "content1");
      createFileWithContent(srcPath2, "content2");
  
      localFileSystem.rename(
          toLocalResourceIds(ImmutableList.of(srcPath1, srcPath2), false /* isDirectory */),
          toLocalResourceIds(ImmutableList.of(destPath1, destPath2), false /* isDirectory */));
  
      assertContents(
          ImmutableList.of(destPath1, destPath2), ImmutableList.of("content1", "content2"));
  
      assertFalse(srcPath1 + "exists", srcPath1.toFile().exists());
      assertFalse(srcPath2 + "exists", srcPath2.toFile().exists());
    }
  
    @Test
    public void testMoveWithNonExistingSrcFile() throws Exception {
      Path existingSrc = temporaryFolder.newFile().toPath();
      Path nonExistingSrc = temporaryFolder.getRoot().toPath().resolve("non-existent-file.txt");
  
      Path destPath1 = temporaryFolder.getRoot().toPath().resolve("nonexistentdir").resolve("dest1");
      Path destPath2 = destPath1.resolveSibling("dest2");
  
      createFileWithContent(existingSrc, "content1");
  
      thrown.expect(NoSuchFileException.class);
  
      localFileSystem.rename(
          toLocalResourceIds(ImmutableList.of(existingSrc, nonExistingSrc), false /* isDirectory */),
          toLocalResourceIds(ImmutableList.of(destPath1, destPath2), false /* isDirectory */));
    }
  
    @Test
    public void testMoveFilesWithException() throws Exception {
      Path srcPath1 = temporaryFolder.newFile().toPath();
      Path srcPath2 = temporaryFolder.newFile().toPath();
  
      Path destPath1 = temporaryFolder.getRoot().toPath().resolve("nonexistentdir").resolve("dest1");
      Path destPath2 = srcPath2.resolveSibling("dest2");
  
      createFileWithContent(srcPath1, "content1");
      createFileWithContent(srcPath2, "content2");
  
      try (MockedStatic<java.nio.file.Files> mockFiles =
          Mockito.mockStatic(java.nio.file.Files.class)) {
        System.out.println(srcPath1 + " plus " + destPath1);
  
        mockFiles
            .when(() -> java.nio.file.Files.move(any(), any(), any(), any()))
            .thenThrow(new RuntimeException("exception while moving files"));
  
        thrown.expect(RuntimeException.class);
  
        localFileSystem.rename(
            toLocalResourceIds(ImmutableList.of(srcPath1, srcPath2), false /* isDirectory */),
            toLocalResourceIds(ImmutableList.of(destPath1, destPath2), false /* isDirectory */));
      }
    }
  
    @Test
    public void testDelete() throws Exception {
      File f1 = temporaryFolder.newFile("file1");
      File f2 = temporaryFolder.newFile("file2");
      File f3 = temporaryFolder.newFile("other-file");
      localFileSystem.delete(
          toLocalResourceIds(Lists.newArrayList(f1.toPath(), f2.toPath()), false /* isDirectory */));
      assertFalse(f1.exists());
      assertFalse(f2.exists());
      assertTrue(f3.exists());
    }
  
    @Test
    public void testMatchWithGlob() throws Exception {
      String globPattern = "/A/a=[0-9][0-9][0-9]/*/*";
      File baseFolder = temporaryFolder.newFolder("A");
      File folder1 = new File(baseFolder, "a=100");
      File folder2 = new File(baseFolder, "a=233");
      File dataFolder1 = new File(folder1, "data1");
      File dataFolder2 = new File(folder2, "data_dir");
      File expectedFile1 = new File(dataFolder1, "file1");
      File expectedFile2 = new File(dataFolder2, "data_file2");
  
      createEmptyFile(expectedFile1);
      createEmptyFile(expectedFile2);
  
      List<String> expected =
          ImmutableList.of(expectedFile1.getAbsolutePath(), expectedFile2.getAbsolutePath());
  
      List<MatchResult> matchResults =
          matchGlobWithPathPrefix(temporaryFolder.getRoot().toPath(), globPattern);
  
      assertThat(
          toFilenames(matchResults),
          containsInAnyOrder(expected.toArray(new String[expected.size()])));
    }
  
    @Test
    public void testMatchRelativeWildcardPath() throws Exception {
      File baseFolder = temporaryFolder.newFolder("A");
      File expectedFile1 = new File(baseFolder, "file1");
  
      expectedFile1.createNewFile();
  
      List<String> expected = ImmutableList.of(expectedFile1.getAbsolutePath());
  
      // This no longer works:
      //     System.setProperty("user.dir", temporaryFolder.getRoot().toString());
      // There is no way to set the working directory without forking. Instead we
      // call in to the helper method that gives just about as good test coverage.
      List<MatchResult> matchResults =
          localFileSystem.match(temporaryFolder.getRoot().toString(), ImmutableList.of("A/*"));
      assertThat(
          toFilenames(matchResults),
          containsInAnyOrder(expected.toArray(new String[expected.size()])));
    }
  
    @Test
    public void testMatchExact() throws Exception {
      List<String> expected = ImmutableList.of(temporaryFolder.newFile("a").toString());
      temporaryFolder.newFile("aa");
      temporaryFolder.newFile("ab");
  
      List<MatchResult> matchResults =
          localFileSystem.match(
              ImmutableList.of(temporaryFolder.getRoot().toPath().resolve("a").toString()));
      assertThat(
          toFilenames(matchResults),
          containsInAnyOrder(expected.toArray(new String[expected.size()])));
    }
  
    @Test
    public void testMatchDirectory() throws Exception {
      final Path dir = temporaryFolder.newFolder("dir").toPath();
      final MatchResult matchResult =
          Iterables.getOnlyElement(localFileSystem.match(Collections.singletonList(dir.toString())));
      assertThat(
          matchResult,
          equalTo(
              MatchResult.create(
                  MatchResult.Status.OK,
                  ImmutableList.of(
                      MatchResult.Metadata.builder()
                          .setResourceId(LocalResourceId.fromPath(dir, true))
                          .setIsReadSeekEfficient(true)
                          .setSizeBytes(dir.toFile().length())
                          .setLastModifiedMillis(dir.toFile().lastModified())
                          .build()))));
    }
  
    @Test
    public void testMatchPatternNone() throws Exception {
      temporaryFolder.newFile("a");
      temporaryFolder.newFile("aa");
      temporaryFolder.newFile("ab");
  
      List<MatchResult> matchResults =
          matchGlobWithPathPrefix(temporaryFolder.getRoot().toPath().resolve("b"), "*");
      assertEquals(1, matchResults.size());
      assertEquals(MatchResult.Status.NOT_FOUND, matchResults.get(0).status());
    }
  
    @Test
    public void testMatchForNonExistentFile() throws Exception {
      temporaryFolder.newFile("aa");
  
      List<MatchResult> matchResults =
          localFileSystem.match(
              ImmutableList.of(temporaryFolder.getRoot().toPath().resolve("a").toString()));
      assertEquals(1, matchResults.size());
      assertEquals(MatchResult.Status.NOT_FOUND, matchResults.get(0).status());
    }
  
    @Test
    public void testMatchMultipleWithFileExtension() throws Exception {
      List<String> expected =
          ImmutableList.of(
              temporaryFolder.newFile("a.txt").toString(),
              temporaryFolder.newFile("aa.txt").toString(),
              temporaryFolder.newFile("ab.txt").toString());
      temporaryFolder.newFile("a.avro");
      temporaryFolder.newFile("ab.avro");
  
      List<MatchResult> matchResults =
          matchGlobWithPathPrefix(temporaryFolder.getRoot().toPath().resolve("a"), "*.txt");
      assertThat(
          toFilenames(matchResults),
          containsInAnyOrder(expected.toArray(new String[expected.size()])));
    }
  
    @Test
    public void testMatchInDirectory() throws Exception {
      List<String> expected = ImmutableList.of(temporaryFolder.newFile("a").toString());
      temporaryFolder.newFile("aa");
      temporaryFolder.newFile("ab");
  
      String expectedFile = expected.get(0);
      int slashIndex = expectedFile.lastIndexOf('/');
      if (SystemUtils.IS_OS_WINDOWS) {
        slashIndex = expectedFile.lastIndexOf('\\');
      }
      String directory = expectedFile.substring(0, slashIndex);
      String relative = expectedFile.substring(slashIndex + 1);
      // This no longer works:
      //     System.setProperty("user.dir", directory);
      // There is no way to set the working directory without forking. Instead we
      // call in to the helper method that gives just about as good test coverage.
      List<MatchResult> results = localFileSystem.match(directory, ImmutableList.of(relative));
      assertThat(
          toFilenames(results), containsInAnyOrder(expected.toArray(new String[expected.size()])));
    }
  
    @Test
    public void testMatchWithFileSlashPrefix() throws Exception {
      List<String> expected = ImmutableList.of(temporaryFolder.newFile("a").toString());
      temporaryFolder.newFile("aa");
      temporaryFolder.newFile("ab");
  
      String file = "file:/" + temporaryFolder.getRoot().toPath().resolve("a").toString();
      List<MatchResult> results = localFileSystem.match(ImmutableList.of(file));
      assertThat(
          toFilenames(results), containsInAnyOrder(expected.toArray(new String[expected.size()])));
    }
  
    @Test
    public void testMatchWithFileThreeSlashesPrefix() throws Exception {
      List<String> expected = ImmutableList.of(temporaryFolder.newFile("a").toString());
      temporaryFolder.newFile("aa");
      temporaryFolder.newFile("ab");
  
      String file = "file:///" + temporaryFolder.getRoot().toPath().resolve("a").toString();
      List<MatchResult> results = localFileSystem.match(ImmutableList.of(file));
      assertThat(
          toFilenames(results), containsInAnyOrder(expected.toArray(new String[expected.size()])));
    }
  
    @Test
    public void testMatchMultipleWithoutSubdirectoryExpansion() throws Exception {
      File unmatchedSubDir = temporaryFolder.newFolder("aaa");
      File unmatchedSubDirFile = File.createTempFile("sub-dir-file", "", unmatchedSubDir);
      unmatchedSubDirFile.deleteOnExit();
      List<String> expected =
          ImmutableList.of(
              temporaryFolder.newFile("a").toString(),
              temporaryFolder.newFile("aa").toString(),
              temporaryFolder.newFile("ab").toString());
      temporaryFolder.newFile("ba");
      temporaryFolder.newFile("bb");
  
      List<MatchResult> matchResults =
          matchGlobWithPathPrefix(temporaryFolder.getRoot().toPath().resolve("a"), "*");
      assertThat(
          toFilenames(matchResults),
          containsInAnyOrder(expected.toArray(new String[expected.size()])));
    }
  
    @Test
    public void testMatchMultipleWithSubdirectoryExpansion() throws Exception {
      File matchedSubDir = temporaryFolder.newFolder("a");
      File matchedSubDirFile = File.createTempFile("sub-dir-file", "", matchedSubDir);
      matchedSubDirFile.deleteOnExit();
      File unmatchedSubDir = temporaryFolder.newFolder("b");
      File unmatchedSubDirFile = File.createTempFile("sub-dir-file", "", unmatchedSubDir);
      unmatchedSubDirFile.deleteOnExit();
  
      List<String> expected =
          ImmutableList.of(
              matchedSubDirFile.toString(),
              temporaryFolder.newFile("aa").toString(),
              temporaryFolder.newFile("ab").toString());
      temporaryFolder.newFile("ba");
      temporaryFolder.newFile("bb");
  
      List<MatchResult> matchResults =
          matchGlobWithPathPrefix(temporaryFolder.getRoot().toPath().resolve("a"), "**");
      assertThat(
          toFilenames(matchResults),
          Matchers.hasItems(expected.toArray(new String[expected.size()])));
    }
  
    @Test
    public void testMatchWithDirectoryFiltersOutDirectory() throws Exception {
      List<String> expected = ImmutableList.of(temporaryFolder.newFile("a").toString());
      temporaryFolder.newFolder("a_dir_that_should_not_be_matched");
  
      List<MatchResult> matchResults =
          matchGlobWithPathPrefix(temporaryFolder.getRoot().toPath().resolve("a"), "*");
      assertThat(
          toFilenames(matchResults),
          containsInAnyOrder(expected.toArray(new String[expected.size()])));
    }
  
    @Test
    public void testMatchWithoutParentDirectory() throws Exception {
      // TODO: Java core test failing on windows, https://github.com/apache/beam/issues/20478
      assumeFalse(SystemUtils.IS_OS_WINDOWS);
      Path pattern =
          LocalResourceId.fromPath(temporaryFolder.getRoot().toPath(), true /* isDirectory */)
              .resolve("non_existing_dir", StandardResolveOptions.RESOLVE_DIRECTORY)
              .resolve("*", StandardResolveOptions.RESOLVE_FILE)
              .getPath();
      assertTrue(toFilenames(localFileSystem.match(ImmutableList.of(pattern.toString()))).isEmpty());
    }
  
    @Test
    public void testMatchNewResource() {
      // TODO: Java core test failing on windows, https://github.com/apache/beam/issues/20461
      assumeFalse(SystemUtils.IS_OS_WINDOWS);
      LocalResourceId fileResource =
          localFileSystem.matchNewResource("/some/test/resource/path", false /* isDirectory */);
      LocalResourceId dirResource =
          localFileSystem.matchNewResource("/some/test/resource/path", true /* isDirectory */);
      assertNotEquals(fileResource, dirResource);
      assertThat(
          fileResource
              .getCurrentDirectory()
              .resolve("path", StandardResolveOptions.RESOLVE_DIRECTORY),
          equalTo(dirResource.getCurrentDirectory()));
      assertThat(
          fileResource
              .getCurrentDirectory()
              .resolve("path", StandardResolveOptions.RESOLVE_DIRECTORY),
          equalTo(dirResource.getCurrentDirectory()));
      assertThat(dirResource.toString(), equalTo("/some/test/resource/path/"));
  
      IllegalArgumentException exception =
          assertThrows(
              IllegalArgumentException.class,
              () -> localFileSystem.matchNewResource("/some/test/resource/path/", false));
      assertTrue(exception.getMessage().startsWith("Expected file path but received directory path"));
    }
  
    @Test
    public void testGetDefaultFileSystemException() throws Exception {
      temporaryFolder.newFile("a");
  
      try (MockedStatic<java.nio.file.FileSystems> mockFileSystems =
          Mockito.mockStatic(java.nio.file.FileSystems.class)) {
        mockFileSystems
            .when(java.nio.file.FileSystems::getDefault)
            .thenThrow(new RuntimeException("exception finding filesystem"));
  
        thrown.expect(RuntimeException.class);
  
        localFileSystem.match(
            ImmutableList.of(temporaryFolder.getRoot().toPath().resolve("a").toString()));
      }
    }
  
    private void createFileWithContent(Path path, String content) throws Exception {
      try (Writer writer =
          Channels.newWriter(
              localFileSystem.create(
                  LocalResourceId.fromPath(path, false /* isDirectory */),
                  StandardCreateOptions.builder().setMimeType(MimeTypes.TEXT).build()),
              StandardCharsets.UTF_8.name())) {
        writer.write(content);
      }
    }
  
    private List<MatchResult> matchGlobWithPathPrefix(Path pathPrefix, String glob)
        throws IOException {
      // Windows doesn't like resolving paths with * in glob, so the glob is concatenated as String.
      return localFileSystem.match(ImmutableList.of(pathPrefix + glob));
    }
  
    private List<LocalResourceId> toLocalResourceIds(List<Path> paths, final boolean isDirectory) {
      return FluentIterable.from(paths)
          .transform(path -> LocalResourceId.fromPath(path, isDirectory))
          .toList();
    }
  
    private List<String> toFilenames(List<MatchResult> matchResults) {
      return FluentIterable.from(matchResults)
          .transformAndConcat(
              matchResult -> {
                try {
                  return matchResult.metadata();
                } catch (IOException e) {
                  throw new RuntimeException(e);
                }
              })
          .transform(metadata -> ((LocalResourceId) metadata.resourceId()).getPath().toString())
          .toList();
    }
  
    private static void createEmptyFile(File file) throws IOException {
      if (!file.getParentFile().mkdirs() || !file.createNewFile()) {
        throw new IOException("Failed creating empty file " + file.getAbsolutePath());
      }
    }
  }
  