org.apache.commons.io.file

## Class PathUtils

- java.lang.Object
- - org.apache.commons.io.file.PathUtils

-     public final class PathUtils
      extends Object

  NIO Path utilities.
  Since:
    2.7

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static FileVisitOption[]` | `EMPTY_FILE_VISIT_OPTION_ARRAY` Empty `FileVisitOption` array.
    `static LinkOption[]` | `EMPTY_LINK_OPTION_ARRAY` Empty `LinkOption` array.
    `static OpenOption[]` | `EMPTY_OPEN_OPTION_ARRAY` Empty `OpenOption` array.

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static Counters.PathCounters` | `cleanDirectory(Path directory)` Cleans a directory including sub-directories without deleting directories.
    `static Counters.PathCounters` | `copyDirectory(Path sourceDirectory, Path targetDirectory, CopyOption... copyOptions)` Copies a directory to another directory.
    `static Path` | `copyFile(URL sourceFile, Path targetFile, CopyOption... copyOptions)` Copies a URL to a directory.
    `static Path` | `copyFileToDirectory(Path sourceFile, Path targetDirectory, CopyOption... copyOptions)` Copies a file to a directory.
    `static Path` | `copyFileToDirectory(URL sourceFile, Path targetDirectory, CopyOption... copyOptions)` Copies a URL to a directory.
    `static Counters.PathCounters` | `countDirectory(Path directory)` Counts aspects of a directory including sub-directories.
    `static Counters.PathCounters` | `delete(Path path)` Deletes a file or directory.
    `static Counters.PathCounters` | `deleteDirectory(Path directory)` Deletes a directory including sub-directories.
    `static Counters.PathCounters` | `deleteFile(Path file)` Deletes the given file.
    `static boolean` | `directoryAndFileContentEquals(Path path1, Path path2)` Compares the file sets of two Paths to determine if they are equal or not while considering file contents.
    `static boolean` | `directoryAndFileContentEquals(Path path1, Path path2, LinkOption[] linkOptions, OpenOption[] openOptions, FileVisitOption[] fileVisitOption)` Compares the file sets of two Paths to determine if they are equal or not while considering file contents.
    `static boolean` | `directoryContentEquals(Path path1, Path path2)` Compares the file sets of two Paths to determine if they are equal or not without considering file contents.
    `static boolean` | `directoryContentEquals(Path path1, Path path2, int maxDepth, LinkOption[] linkOptions, FileVisitOption[] fileVisitOptions)` Compares the file sets of two Paths to determine if they are equal or not without considering file contents.
    `static boolean` | `fileContentEquals(Path path1, Path path2)` Compares the file contents of two Paths to determine if they are equal or not.
    `static boolean` | `fileContentEquals(Path path1, Path path2, LinkOption[] linkOptions, OpenOption[] openOptions)` Compares the file contents of two Paths to determine if they are equal or not.
    `static boolean` | `isEmpty(Path path)` Returns whether the given file or directory is empty.
    `static boolean` | `isEmptyDirectory(Path directory)` Returns whether the directory is empty.
    `static boolean` | `isEmptyFile(Path file)` Returns whether the given file is empty.
    `static <T extends FileVisitor<? super Path>> T` | `visitFileTree(T visitor, Path directory)` Performs `Files.walkFileTree(Path,FileVisitor)` and returns the given visitor.
    `static <T extends FileVisitor<? super Path>> T` | `visitFileTree(T visitor, Path start, Set<FileVisitOption> options, int maxDepth)` Performs `Files.walkFileTree(Path,FileVisitor)` and returns the given visitor.
    `static <T extends FileVisitor<? super Path>> T` | `visitFileTree(T visitor, String first, String... more)` Performs `Files.walkFileTree(Path,FileVisitor)` and returns the given visitor.
    `static <T extends FileVisitor<? super Path>> T` | `visitFileTree(T visitor, URI uri)` Performs `Files.walkFileTree(Path,FileVisitor)` and returns the given visitor.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### EMPTY_FILE_VISIT_OPTION_ARRAY

          public static final FileVisitOption[] EMPTY_FILE_VISIT_OPTION_ARRAY

      Empty `FileVisitOption` array.

    - #### EMPTY_LINK_OPTION_ARRAY

          public static final LinkOption[] EMPTY_LINK_OPTION_ARRAY

      Empty `LinkOption` array.

    - #### EMPTY_OPEN_OPTION_ARRAY

          public static final OpenOption[] EMPTY_OPEN_OPTION_ARRAY

      Empty `OpenOption` array.

  - ### Method Detail

    - #### cleanDirectory

          public static Counters.PathCounters cleanDirectory(Path directory)
                                                      throws IOException

      Cleans a directory including sub-directories without deleting directories.
      Parameters:
        `directory` - directory to clean.
      Returns:
        The visitation path counters.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method.

    - #### copyDirectory

          public static Counters.PathCounters copyDirectory(Path sourceDirectory,
                                                            Path targetDirectory,
                                                            CopyOption... copyOptions)
                                                     throws IOException

      Copies a directory to another directory.
      Parameters:
        `sourceDirectory` - The source directory.
        `targetDirectory` - The target directory.
        `copyOptions` - Specifies how the copying should be done.
      Returns:
        The visitation path counters.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method.

    - #### copyFile

          public static Path copyFile(URL sourceFile,
                                      Path targetFile,
                                      CopyOption... copyOptions)
                               throws IOException

      Copies a URL to a directory.
      Parameters:
        `sourceFile` - The source URL.
        `targetFile` - The target file.
        `copyOptions` - Specifies how the copying should be done.
      Returns:
        The target file
      Throws:
        `IOException` - if an I/O error occurs
      See Also:
        `Files.copy(InputStream, Path, CopyOption...)`

    - #### copyFileToDirectory

          public static Path copyFileToDirectory(Path sourceFile,
                                                 Path targetDirectory,
                                                 CopyOption... copyOptions)
                                          throws IOException

      Copies a file to a directory.
      Parameters:
        `sourceFile` - The source file.
        `targetDirectory` - The target directory.
        `copyOptions` - Specifies how the copying should be done.
      Returns:
        The target file
      Throws:
        `IOException` - if an I/O error occurs
      See Also:
        `Files.copy(Path, Path, CopyOption...)`

    - #### copyFileToDirectory

          public static Path copyFileToDirectory(URL sourceFile,
                                                 Path targetDirectory,
                                                 CopyOption... copyOptions)
                                          throws IOException

      Copies a URL to a directory.
      Parameters:
        `sourceFile` - The source URL.
        `targetDirectory` - The target directory.
        `copyOptions` - Specifies how the copying should be done.
      Returns:
        The target file
      Throws:
        `IOException` - if an I/O error occurs
      See Also:
        `Files.copy(InputStream, Path, CopyOption...)`

    - #### countDirectory

          public static Counters.PathCounters countDirectory(Path directory)
                                                      throws IOException

      Counts aspects of a directory including sub-directories.
      Parameters:
        `directory` - directory to delete.
      Returns:
        The visitor used to count the given directory.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method.

    - #### delete

          public static Counters.PathCounters delete(Path path)
                                              throws IOException

      Deletes a file or directory. If the path is a directory, delete it and all sub-directories.

      The difference between File.delete() and this method are:

      - A directory to delete does not have to be empty.
      - You get exceptions when a file or directory cannot be deleted; `File.delete()` returns a boolean.
      Parameters:
        `path` - file or directory to delete, must not be `null`
      Returns:
        The visitor used to delete the given directory.
      Throws:
        `NullPointerException` - if the directory is `null`
        `IOException` - if an I/O error is thrown by a visitor method or if an I/O error occurs.

    - #### deleteDirectory

          public static Counters.PathCounters deleteDirectory(Path directory)
                                                       throws IOException

      Deletes a directory including sub-directories.
      Parameters:
        `directory` - directory to delete.
      Returns:
        The visitor used to delete the given directory.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method.

    - #### deleteFile

          public static Counters.PathCounters deleteFile(Path file)
                                                  throws IOException

      Deletes the given file.
      Parameters:
        `file` - The file to delete.
      Returns:
        A visitor with path counts set to 1 file, 0 directories, and the size of the deleted file.
      Throws:
        `IOException` - if an I/O error occurs.
        `NotDirectoryException` - if the file is a directory.

    - #### directoryAndFileContentEquals

          public static boolean directoryAndFileContentEquals(Path path1,
                                                              Path path2)
                                                       throws IOException

      Compares the file sets of two Paths to determine if they are equal or not while considering file contents. The comparison includes all files in all sub-directories.
      Parameters:
        `path1` - The first directory.
        `path2` - The second directory.
      Returns:
        Whether the two directories contain the same files while considering file contents.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method

    - #### directoryAndFileContentEquals

          public static boolean directoryAndFileContentEquals(Path path1,
                                                              Path path2,
                                                              LinkOption[] linkOptions,
                                                              OpenOption[] openOptions,
                                                              FileVisitOption[] fileVisitOption)
                                                       throws IOException

      Compares the file sets of two Paths to determine if they are equal or not while considering file contents. The comparison includes all files in all sub-directories.
      Parameters:
        `path1` - The first directory.
        `path2` - The second directory.
        `linkOptions` - options to follow links.
        `openOptions` - options to open files.
        `fileVisitOption` - options to configure traversal.
      Returns:
        Whether the two directories contain the same files while considering file contents.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method

    - #### directoryContentEquals

          public static boolean directoryContentEquals(Path path1,
                                                       Path path2)
                                                throws IOException

      Compares the file sets of two Paths to determine if they are equal or not without considering file contents. The comparison includes all files in all sub-directories.
      Parameters:
        `path1` - The first directory.
        `path2` - The second directory.
      Returns:
        Whether the two directories contain the same files without considering file contents.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method

    - #### directoryContentEquals

          public static boolean directoryContentEquals(Path path1,
                                                       Path path2,
                                                       int maxDepth,
                                                       LinkOption[] linkOptions,
                                                       FileVisitOption[] fileVisitOptions)
                                                throws IOException

      Compares the file sets of two Paths to determine if they are equal or not without considering file contents. The comparison includes all files in all sub-directories.
      Parameters:
        `path1` - The first directory.
        `path2` - The second directory.
        `maxDepth` - See `Files.walkFileTree(Path,Set,int,FileVisitor)`.
        `linkOptions` - options to follow links.
        `fileVisitOptions` - options to configure the traversal
      Returns:
        Whether the two directories contain the same files without considering file contents.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method

    - #### fileContentEquals

          public static boolean fileContentEquals(Path path1,
                                                  Path path2)
                                           throws IOException

      Compares the file contents of two Paths to determine if they are equal or not.

      File content is accessed through `Files.newInputStream(Path,OpenOption...)`.

      Parameters:
        `path1` - the first stream.
        `path2` - the second stream.
      Returns:
        true if the content of the streams are equal or they both don't exist, false otherwise.
      Throws:
        `NullPointerException` - if either input is null.
        `IOException` - if an I/O error occurs.
      See Also:
        `FileUtils.contentEquals(java.io.File, java.io.File)`

    - #### fileContentEquals

          public static boolean fileContentEquals(Path path1,
                                                  Path path2,
                                                  LinkOption[] linkOptions,
                                                  OpenOption[] openOptions)
                                           throws IOException

      Compares the file contents of two Paths to determine if they are equal or not.

      File content is accessed through `Files.newInputStream(Path,OpenOption...)`.

      Parameters:
        `path1` - the first stream.
        `path2` - the second stream.
        `linkOptions` - options specifying how files are followed.
        `openOptions` - options specifying how files are opened.
      Returns:
        true if the content of the streams are equal or they both don't exist, false otherwise.
      Throws:
        `NullPointerException` - if either input is null.
        `IOException` - if an I/O error occurs.
      See Also:
        `FileUtils.contentEquals(java.io.File, java.io.File)`

    - #### isEmpty

          public static boolean isEmpty(Path path)
                                 throws IOException

      Returns whether the given file or directory is empty.
      Parameters:
        `path` - the the given file or directory to query.
      Returns:
        whether the given file or directory is empty.
      Throws:
        `IOException` - if an I/O error occurs

    - #### isEmptyDirectory

          public static boolean isEmptyDirectory(Path directory)
                                          throws IOException

      Returns whether the directory is empty.
      Parameters:
        `directory` - the the given directory to query.
      Returns:
        whether the given directory is empty.
      Throws:
        `IOException` - if an I/O error occurs

    - #### isEmptyFile

          public static boolean isEmptyFile(Path file)
                                     throws IOException

      Returns whether the given file is empty.
      Parameters:
        `file` - the the given file to query.
      Returns:
        whether the given file is empty.
      Throws:
        `IOException` - if an I/O error occurs

    - #### visitFileTree

          public static <T extends FileVisitor<? super Path>> T visitFileTree(T visitor,
                                                                              Path directory)
                                                                       throws IOException

      Performs `Files.walkFileTree(Path,FileVisitor)` and returns the given visitor. Note that `Files.walkFileTree(Path,FileVisitor)` returns the given path.
      Type Parameters:
        `T` - See `Files.walkFileTree(Path,FileVisitor)`.
      Parameters:
        `visitor` - See `Files.walkFileTree(Path,FileVisitor)`.
        `directory` - See `Files.walkFileTree(Path,FileVisitor)`.
      Returns:
        the given visitor.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method

    - #### visitFileTree

          public static <T extends FileVisitor<? super Path>> T visitFileTree(T visitor,
                                                                              Path start,
                                                                              Set<FileVisitOption> options,
                                                                              int maxDepth)
                                                                       throws IOException

      Performs `Files.walkFileTree(Path,FileVisitor)` and returns the given visitor. Note that `Files.walkFileTree(Path,FileVisitor)` returns the given path.
      Type Parameters:
        `T` - See `Files.walkFileTree(Path,Set,int,FileVisitor)`.
      Parameters:
        `start` - See `Files.walkFileTree(Path,Set,int,FileVisitor)`.
        `options` - See `Files.walkFileTree(Path,Set,int,FileVisitor)`.
        `maxDepth` - See `Files.walkFileTree(Path,Set,int,FileVisitor)`.
        `visitor` - See `Files.walkFileTree(Path,Set,int,FileVisitor)`.
      Returns:
        the given visitor.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method

    - #### visitFileTree

          public static <T extends FileVisitor<? super Path>> T visitFileTree(T visitor,
                                                                              String first,
                                                                              String... more)
                                                                       throws IOException

      Performs `Files.walkFileTree(Path,FileVisitor)` and returns the given visitor. Note that `Files.walkFileTree(Path,FileVisitor)` returns the given path.
      Type Parameters:
        `T` - See `Files.walkFileTree(Path,FileVisitor)`.
      Parameters:
        `visitor` - See `Files.walkFileTree(Path,FileVisitor)`.
        `first` - See `Paths.get(String,String[])`.
        `more` - See `Paths.get(String,String[])`.
      Returns:
        the given visitor.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method

    - #### visitFileTree

          public static <T extends FileVisitor<? super Path>> T visitFileTree(T visitor,
                                                                              URI uri)
                                                                       throws IOException

      Performs `Files.walkFileTree(Path,FileVisitor)` and returns the given visitor. Note that `Files.walkFileTree(Path,FileVisitor)` returns the given path.
      Type Parameters:
        `T` - See `Files.walkFileTree(Path,FileVisitor)`.
      Parameters:
        `visitor` - See `Files.walkFileTree(Path,FileVisitor)`.
        `uri` - See `Paths.get(URI)`.
      Returns:
        the given visitor.
      Throws:
        `IOException` - if an I/O error is thrown by a visitor method

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