FileUtils (Apache Ant API)
Description: declaration: package: org.apache.tools.ant.util, class: FileUtils

Package org.apache.tools.ant.util

# Class FileUtils

java.lang.Object
org.apache.tools.ant.util.FileUtils

public class FileUtils extends Object
This class also encapsulates methods which allow Files to be referred to using abstract path names which are translated to native system file paths at runtime as well as copying files or setting their last modification time.

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final long`
  `FAT_FILE_TIMESTAMP_GRANULARITY`
  The granularity of timestamps under FAT.
  `static final long`
  `NTFS_FILE_TIMESTAMP_GRANULARITY`
  The granularity of timestamps under the NT File System.
  `static final long`
  `UNIX_FILE_TIMESTAMP_GRANULARITY`
  The granularity of timestamps under Unix.

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `FileUtils()`
  Empty constructor.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `boolean`
  `areSame(File f1, File f2)`
  Are the two File instances pointing to the same object on the file system?
  `static void`
  `close(InputStream device)`
  Close a stream without throwing any exception if something went wrong.
  `static void`
  `close(OutputStream device)`
  Close a stream without throwing any exception if something went wrong.
  `static void`
  `close(Reader device)`
  Close a Reader without throwing any exception if something went wrong.
  `static void`
  `close(Writer device)`
  Close a Writer without throwing any exception if something went wrong.
  `static void`
  `close(AutoCloseable ac)`
  Close an `AutoCloseable` without throwing any exception if something went wrong.
  `static void`
  `close(URLConnection conn)`
  Closes an URLConnection if its concrete implementation provides a way to close it that Ant knows of.
  `static void`
  `close(Channel device)`
  Close a Channel without throwing any exception if something went wrong.
  `boolean`
  `contentEquals(File f1, File f2)`
  Compares the contents of two files.
  `boolean`
  `contentEquals(File f1, File f2, boolean textfile)`
  Compares the contents of two files.
  `void`
  `copyFile(File sourceFile, File destFile)`
  Convenience method to copy a file from a source to a destination.
  `void`
  `copyFile(File sourceFile, File destFile, FilterSetCollection filters)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used.
  `void`
  `copyFile(File sourceFile, File destFile, FilterSetCollection filters, boolean overwrite)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used and if source files may overwrite newer destination files.
  `void`
  `copyFile(File sourceFile, File destFile, FilterSetCollection filters, boolean overwrite, boolean preserveLastModified)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
  `void`
  `copyFile(File sourceFile, File destFile, FilterSetCollection filters, boolean overwrite, boolean preserveLastModified, String encoding)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if source files may overwrite newer destination files, the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile` and which character encoding to assume.
  `void`
  `copyFile(File sourceFile, File destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, boolean append, String inputEncoding, String outputEncoding, Project project)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
  `void`
  `copyFile(File sourceFile, File destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, boolean append, String inputEncoding, String outputEncoding, Project project, boolean force)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
  `void`
  `copyFile(File sourceFile, File destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, String inputEncoding, String outputEncoding, Project project)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
  `void`
  `copyFile(File sourceFile, File destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, String encoding, Project project)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
  `void`
  `copyFile(String sourceFile, String destFile)`
  Convenience method to copy a file from a source to a destination.
  `void`
  `copyFile(String sourceFile, String destFile, FilterSetCollection filters)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used.
  `void`
  `copyFile(String sourceFile, String destFile, FilterSetCollection filters, boolean overwrite)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used and if source files may overwrite newer destination files.
  `void`
  `copyFile(String sourceFile, String destFile, FilterSetCollection filters, boolean overwrite, boolean preserveLastModified)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
  `void`
  `copyFile(String sourceFile, String destFile, FilterSetCollection filters, boolean overwrite, boolean preserveLastModified, String encoding)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
  `void`
  `copyFile(String sourceFile, String destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, String inputEncoding, String outputEncoding, Project project)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
  `void`
  `copyFile(String sourceFile, String destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, String encoding, Project project)`
  Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
  `boolean`
  `createNewFile(File f)`
  This was originally an emulation of File.createNewFile for JDK 1.1, but it is now implemented using that method (Ant 1.6.3 onwards).
  `boolean`
  `createNewFile(File f, boolean mkdirs)`
  Create a new file, optionally creating parent directories.
  `File`
  `createTempFile(String prefix, String suffix, File parentDir)`
  Deprecated.
  since ant 1.7.1 use createTempFile(Project, String, String, File, boolean, boolean) instead.
  `File`
  `createTempFile(String prefix, String suffix, File parentDir, boolean deleteOnExit)`
  Deprecated.
  since ant 1.7.1 use createTempFile(Project, String, String, File, boolean, boolean) instead.
  `File`
  `createTempFile(String prefix, String suffix, File parentDir, boolean deleteOnExit, boolean createFile)`
  Deprecated.
  since Ant 1.10.8 use createTempFile(Project, String, String, File, boolean, boolean) instead.
  `File`
  `createTempFile(Project project, String prefix, String suffix, File parentDir, boolean deleteOnExit, boolean createFile)`
  Create a temporary file in a given directory.
  `static void`
  `delete(File file)`
  Delete the file with `File.delete()` if the argument is not null.
  `String[]`
  `dissect(String path)`
  Dissect the specified absolute path.
  `boolean`
  `fileNameEquals(File f1, File f2)`
  Compares two filenames.
  `String`
  `fromURI(String uri)`
  Constructs a file path from a `file:` URI.
  `String`
  `getDefaultEncoding()`
  Get the default encoding.
  `long`
  `getFileTimestampGranularity()`
  Get the granularity of file timestamps.
  `URL`
  `getFileURL(File file)`
  Get the URL for a file taking into account # characters.
  `static FileUtils`
  `getFileUtils()`
  Method to retrieve The FileUtils, which is shared by all users of this method.
  `File`
  `getParentFile(File f)`
  Deprecated.
  since 1.7.
  `static String`
  `getPath(List<String> pathStack)`
  Gets path from a `List` of `String`s.
  `static String`
  `getPath(List<String> pathStack, char separatorChar)`
  Gets path from a `List` of `String`s.
  `static String[]`
  `getPathStack(String path)`
  Gets all names of the path as an array of `String`s.
  `static String`
  `getRelativePath(File fromFile, File toFile)`
  Calculates the relative path between two files.
  `boolean`
  `hasErrorInCase(File localFile)`
  test whether a file or directory exists, with an error in the upper/lower case spelling of the name.
  `static boolean`
  `isAbsolutePath(String filename)`
  Verifies that the specified filename represents an absolute path.
  `static Optional<Boolean>`
  `isCaseSensitiveFileSystem(Path path)`
  Tries to determine the case sensitivity of the filesystem corresponding to the `path`.
  `static boolean`
  `isContextRelativePath(String filename)`
  On DOS and NetWare, the evaluation of certain file specifications is context-dependent.
  `boolean`
  `isLeadingPath(File leading, File path)`
  Learn whether one path "leads" another.
  `boolean`
  `isLeadingPath(File leading, File path, boolean resolveSymlinks)`
  Learn whether one path "leads" another.
  `boolean`
  `isSymbolicLink(File parent, String name)`
  Deprecated.
  use `Files.isSymbolicLink(Path)` instead
  `boolean`
  `isUpToDate(long sourceTime, long destTime)`
  Compare two timestamps for being up to date using the current granularity.
  `boolean`
  `isUpToDate(long sourceTime, long destTime, long granularity)`
  Compare two timestamps for being up to date using the specified granularity.
  `boolean`
  `isUpToDate(File source, File dest)`
  Returns true if the source is older than the dest.
  `boolean`
  `isUpToDate(File source, File dest, long granularity)`
  Returns true if the source is older than the dest.
  `static FileUtils`
  `newFileUtils()`
  Deprecated.
  since 1.7.
  `static OutputStream`
  `newOutputStream(Path path, boolean append)`
  Opens a new OutputStream for the given Path.
  `File`
  `normalize(String path)`
  "Normalize" the given absolute path.
  `static String`
  `readFully(Reader rdr)`
  Read from reader till EOF.
  `static String`
  `readFully(Reader rdr, int bufferSize)`
  Read from reader till EOF.
  `String`
  `removeLeadingPath(File leading, File path)`
  Removes a leading path from a second path.
  `void`
  `rename(File from, File to)`
  Renames a file, even if that involves crossing file system boundaries.
  `File`
  `resolveFile(File file, String filename)`
  Interpret the filename as a file relative to the given file unless the filename already represents an absolute filename.
  `static String`
  `safeReadFully(Reader reader)`
  Safe read fully - do not return a null for an empty reader.
  `void`
  `setFileLastModified(File file, long time)`
  Calls File.setLastModified(long time).
  `String`
  `toURI(String path)`
  Constructs a `file:` URI that represents the external form of the given pathname.
  `String`
  `toVMSPath(File f)`
  Returns a VMS String representation of a `File` object.
  `static String`
  `translatePath(String toProcess)`
  Translate a path into its native (platform specific) format.
  `boolean`
  `tryHardToDelete(File f)`
  Accommodate Windows bug encountered in both Sun and IBM JDKs.
  `boolean`
  `tryHardToDelete(File f, boolean runGC)`
  If delete does not work, call System.gc() if asked to, wait a little and try again.

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

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

- ## Field Details

  - ### FAT_FILE_TIMESTAMP_GRANULARITY

    public static final long FAT_FILE_TIMESTAMP_GRANULARITY
    The granularity of timestamps under FAT.
    See Also:
      - Constant Field Values

  - ### UNIX_FILE_TIMESTAMP_GRANULARITY

    public static final long UNIX_FILE_TIMESTAMP_GRANULARITY
    The granularity of timestamps under Unix.
    See Also:
      - Constant Field Values

  - ### NTFS_FILE_TIMESTAMP_GRANULARITY

    public static final long NTFS_FILE_TIMESTAMP_GRANULARITY
    The granularity of timestamps under the NT File System. NTFS has a granularity of 100 nanoseconds, which is less than 1 millisecond, so we round this up to 1 millisecond.
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### FileUtils

    protected FileUtils()
    Empty constructor.

- ## Method Details

  - ### newFileUtils

    @Deprecated public static FileUtils newFileUtils()
    Deprecated.
    since 1.7. Use getFileUtils instead, FileUtils do not have state.
    Factory method.
    Returns:
      a new instance of FileUtils.

  - ### getFileUtils

    public static FileUtils getFileUtils()
    Method to retrieve The FileUtils, which is shared by all users of this method.
    Returns:
      an instance of FileUtils.
    Since:
      Ant 1.6.3

  - ### getFileURL

    public URL getFileURL(File file) throws MalformedURLException
    Get the URL for a file taking into account # characters.
    Parameters:
      `file` - the file whose URL representation is required.
    Returns:
      The FileURL value.
    Throws:
      `MalformedURLException` - if the URL representation cannot be formed.

  - ### copyFile

    public void copyFile(String sourceFile, String destFile) throws IOException
    Convenience method to copy a file from a source to a destination. No filtering is performed.
    Parameters:
      `sourceFile` - Name of file to copy from. Must not be `null`.
      `destFile` - Name of file to copy to. Must not be `null`.
    Throws:
      `IOException` - if the copying fails.

  - ### copyFile

    public void copyFile(String sourceFile, String destFile, FilterSetCollection filters) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used.
    Parameters:
      `sourceFile` - Name of file to copy from. Must not be `null`.
      `destFile` - Name of file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
    Throws:
      `IOException` - if the copying fails.

  - ### copyFile

    public void copyFile(String sourceFile, String destFile, FilterSetCollection filters, boolean overwrite) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used and if source files may overwrite newer destination files.
    Parameters:
      `sourceFile` - Name of file to copy from. Must not be `null`.
      `destFile` - Name of file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
    Throws:
      `IOException` - if the copying fails.

  - ### copyFile

    public void copyFile(String sourceFile, String destFile, FilterSetCollection filters, boolean overwrite, boolean preserveLastModified) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
    Parameters:
      `sourceFile` - Name of file to copy from. Must not be `null`.
      `destFile` - Name of file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
      `preserveLastModified` - Whether or not the last modified time of the resulting file should be set to that of the source file.
    Throws:
      `IOException` - if the copying fails.

  - ### copyFile

    public void copyFile(String sourceFile, String destFile, FilterSetCollection filters, boolean overwrite, boolean preserveLastModified, String encoding) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
    Parameters:
      `sourceFile` - Name of file to copy from. Must not be `null`.
      `destFile` - Name of file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
      `preserveLastModified` - Whether or not the last modified time of the resulting file should be set to that of the source file.
      `encoding` - the encoding used to read and write the files.
    Throws:
      `IOException` - if the copying fails.
    Since:
      Ant 1.5

  - ### copyFile

    public void copyFile(String sourceFile, String destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, String encoding, Project project) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
    Parameters:
      `sourceFile` - Name of file to copy from. Must not be `null`.
      `destFile` - Name of file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `filterChains` - filterChains to apply during the copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
      `preserveLastModified` - Whether or not the last modified time of the resulting file should be set to that of the source file.
      `encoding` - the encoding used to read and write the files.
      `project` - the project instance.
    Throws:
      `IOException` - if the copying fails.
    Since:
      Ant 1.5

  - ### copyFile

    public void copyFile(String sourceFile, String destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, String inputEncoding, String outputEncoding, Project project) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
    Parameters:
      `sourceFile` - Name of file to copy from. Must not be `null`.
      `destFile` - Name of file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `filterChains` - filterChains to apply during the copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
      `preserveLastModified` - Whether or not the last modified time of the resulting file should be set to that of the source file.
      `inputEncoding` - the encoding used to read the files.
      `outputEncoding` - the encoding used to write the files.
      `project` - the project instance.
    Throws:
      `IOException` - if the copying fails.
    Since:
      Ant 1.6

  - ### copyFile

    public void copyFile(File sourceFile, File destFile) throws IOException
    Convenience method to copy a file from a source to a destination. No filtering is performed.
    Parameters:
      `sourceFile` - the file to copy from. Must not be `null`.
      `destFile` - the file to copy to. Must not be `null`.
    Throws:
      `IOException` - if the copying fails.

  - ### copyFile

    public void copyFile(File sourceFile, File destFile, FilterSetCollection filters) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used.
    Parameters:
      `sourceFile` - the file to copy from. Must not be `null`.
      `destFile` - the file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
    Throws:
      `IOException` - if the copying fails.

  - ### copyFile

    public void copyFile(File sourceFile, File destFile, FilterSetCollection filters, boolean overwrite) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used and if source files may overwrite newer destination files.
    Parameters:
      `sourceFile` - the file to copy from. Must not be `null`.
      `destFile` - the file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
    Throws:
      `IOException` - if the copying fails.

  - ### copyFile

    public void copyFile(File sourceFile, File destFile, FilterSetCollection filters, boolean overwrite, boolean preserveLastModified) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
    Parameters:
      `sourceFile` - the file to copy from. Must not be `null`.
      `destFile` - the file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
      `preserveLastModified` - Whether or not the last modified time of the resulting file should be set to that of the source file.
    Throws:
      `IOException` - if the copying fails.

  - ### copyFile

    public void copyFile(File sourceFile, File destFile, FilterSetCollection filters, boolean overwrite, boolean preserveLastModified, String encoding) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if source files may overwrite newer destination files, the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile` and which character encoding to assume.
    Parameters:
      `sourceFile` - the file to copy from. Must not be `null`.
      `destFile` - the file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
      `preserveLastModified` - Whether or not the last modified time of the resulting file should be set to that of the source file.
      `encoding` - the encoding used to read and write the files.
    Throws:
      `IOException` - if the copying fails.
    Since:
      Ant 1.5

  - ### copyFile

    public void copyFile(File sourceFile, File destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, String encoding, Project project) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
    Parameters:
      `sourceFile` - the file to copy from. Must not be `null`.
      `destFile` - the file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `filterChains` - filterChains to apply during the copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
      `preserveLastModified` - Whether or not the last modified time of the resulting file should be set to that of the source file.
      `encoding` - the encoding used to read and write the files.
      `project` - the project instance.
    Throws:
      `IOException` - if the copying fails.
    Since:
      Ant 1.5

  - ### copyFile

    public void copyFile(File sourceFile, File destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, String inputEncoding, String outputEncoding, Project project) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
    Parameters:
      `sourceFile` - the file to copy from. Must not be `null`.
      `destFile` - the file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `filterChains` - filterChains to apply during the copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
      `preserveLastModified` - Whether or not the last modified time of the resulting file should be set to that of the source file.
      `inputEncoding` - the encoding used to read the files.
      `outputEncoding` - the encoding used to write the files.
      `project` - the project instance.
    Throws:
      `IOException` - if the copying fails.
    Since:
      Ant 1.6

  - ### copyFile

    public void copyFile(File sourceFile, File destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, boolean append, String inputEncoding, String outputEncoding, Project project) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
    Parameters:
      `sourceFile` - the file to copy from. Must not be `null`.
      `destFile` - the file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `filterChains` - filterChains to apply during the copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
      `preserveLastModified` - Whether or not the last modified time of the resulting file should be set to that of the source file.
      `append` - whether to append to the destination file.
      `inputEncoding` - the encoding used to read the files.
      `outputEncoding` - the encoding used to write the files.
      `project` - the project instance.
    Throws:
      `IOException` - if the copying fails.
    Since:
      Ant 1.8

  - ### copyFile

    public void copyFile(File sourceFile, File destFile, FilterSetCollection filters, Vector<FilterChain> filterChains, boolean overwrite, boolean preserveLastModified, boolean append, String inputEncoding, String outputEncoding, Project project, boolean force) throws IOException
    Convenience method to copy a file from a source to a destination specifying if token filtering must be used, if filter chains must be used, if source files may overwrite newer destination files and the last modified time of `destFile` file should be made equal to the last modified time of `sourceFile`.
    Parameters:
      `sourceFile` - the file to copy from. Must not be `null`.
      `destFile` - the file to copy to. Must not be `null`.
      `filters` - the collection of filters to apply to this copy.
      `filterChains` - filterChains to apply during the copy.
      `overwrite` - Whether or not the destination file should be overwritten if it already exists.
      `preserveLastModified` - Whether or not the last modified time of the resulting file should be set to that of the source file.
      `append` - whether to append to the destination file.
      `inputEncoding` - the encoding used to read the files.
      `outputEncoding` - the encoding used to write the files.
      `project` - the project instance.
      `force` - whether to overwrite read-only destination files.
    Throws:
      `IOException` - if the copying fails.
    Since:
      Ant 1.8.2

  - ### setFileLastModified

    public void setFileLastModified(File file, long time)
    Calls File.setLastModified(long time). Originally written to to dynamically bind to that call on Java1.2+.
    Parameters:
      `file` - the file whose modified time is to be set
      `time` - the time to which the last modified time is to be set. if this is -1, the current time is used.

  - ### resolveFile

    public File resolveFile(File file, String filename)
    Interpret the filename as a file relative to the given file unless the filename already represents an absolute filename. Differs from `new File(file, filename)` in that the resulting File's path will always be a normalized, absolute pathname. Also, if it is determined that `filename` is context-relative, `file` will be discarded and the reference will be resolved using available context/state information about the filesystem.
    Parameters:
      `file` - the "reference" file for relative paths. This instance must be an absolute file and must not contain "./" or "../" sequences (same for \ instead of /). If it is null, this call is equivalent to `new java.io.File(filename).getAbsoluteFile()`.
      `filename` - a file name.
    Returns:
      an absolute file.
    Throws:
      `NullPointerException` - if filename is null.

  - ### isContextRelativePath

    public static boolean isContextRelativePath(String filename)
    On DOS and NetWare, the evaluation of certain file specifications is context-dependent. These are filenames beginning with a single separator (relative to current root directory) and filenames with a drive specification and no intervening separator (relative to current directory of the specified root).
    Parameters:
      `filename` - the filename to evaluate.
    Returns:
      true if the filename is relative to system context.
    Throws:
      `NullPointerException` - if filename is null.
    Since:
      Ant 1.7

  - ### isAbsolutePath

    public static boolean isAbsolutePath(String filename)
    Verifies that the specified filename represents an absolute path. Differs from new java.io.File("filename").isAbsolute() in that a path beginning with a double file separator--signifying a Windows UNC--must at minimum match "\\a\b" to be considered an absolute path.
    Parameters:
      `filename` - the filename to be checked.
    Returns:
      true if the filename represents an absolute path.
    Throws:
      `NullPointerException` - if filename is null.
    Since:
      Ant 1.6.3

  - ### translatePath

    public static String translatePath(String toProcess)
    Translate a path into its native (platform specific) format.

    This method uses PathTokenizer to separate the input path into its components. This handles DOS style paths in a relatively sensible way. The file separators are then converted to their platform specific versions.

    Parameters:
      `toProcess` - The path to be translated. May be `null`.
    Returns:
      the native version of the specified path or an empty string if the path is `null` or empty.
    Since:
      ant 1.7
    See Also:
      - `PathTokenizer`

  - ### normalize

    public File normalize(String path)
    "Normalize" the given absolute path.

    This includes:

    - Uppercase the drive letter if there is one.
    - Remove redundant slashes after the drive spec.
    - Resolve all ./, .\, ../ and ..\ sequences.
    - DOS style paths that start with a drive letter will have \ as the separator.

    Unlike `File.getCanonicalPath()` this method specifically does not resolve symbolic links.

    If the path tries to go beyond the file system root (i.e. it contains more ".." segments than can be travelled up) the method will return the original path unchanged.

    Parameters:
      `path` - the path to be normalized.
    Returns:
      the normalized version of the path.
    Throws:
      `NullPointerException` - if path is null.

  - ### dissect

    public String[] dissect(String path)
    Dissect the specified absolute path.
    Parameters:
      `path` - the path to dissect.
    Returns:
      String[] {root, remaining path}.
    Throws:
      `NullPointerException` - if path is null.
    Since:
      Ant 1.7

  - ### toVMSPath

    public String toVMSPath(File f)
    Returns a VMS String representation of a `File` object. This is useful since the JVM by default internally converts VMS paths to Unix style. The returned String is always an absolute path.
    Parameters:
      `f` - The `File` to get the VMS path for.
    Returns:
      The absolute VMS path to `f`.

  - ### createTempFile

    @Deprecated public File createTempFile(String prefix, String suffix, File parentDir)
    Deprecated.
    since ant 1.7.1 use createTempFile(Project, String, String, File, boolean, boolean) instead.
    Create a File object for a temporary file in a given directory. Without actually creating the file.

    The file denoted by the returned abstract pathname did not exist before this method was invoked, any subsequent invocation of this method will yield a different file name.

    If the filesystem where the temporary file is created supports POSIX permissions, the file will only be readable and writable by the current user.

    Parameters:
      `prefix` - file name prefix.
      `suffix` - file extension; include the '.'.
      `parentDir` - Directory to create the temporary file in; java.io.tmpdir used if not specified.
    Returns:
      a File reference to the new, nonexistent temporary file.

  - ### createTempFile

    @Deprecated public File createTempFile(String prefix, String suffix, File parentDir, boolean deleteOnExit, boolean createFile)
    Deprecated.
    since Ant 1.10.8 use createTempFile(Project, String, String, File, boolean, boolean) instead.
    Create a temporary file in a given directory.

    The file denoted by the returned abstract pathname did not exist before this method was invoked, any subsequent invocation of this method will yield a different file name.

    If the filesystem where the temporary file is created supports POSIX permissions, the file will only be readable and writable by the current user.

    Parameters:
      `prefix` - file name prefix.
      `suffix` - file extension; include the '.'.
      `parentDir` - Directory to create the temporary file in; java.io.tmpdir used if not specified.
      `deleteOnExit` - whether to set the tempfile for deletion on normal VM exit.
      `createFile` - true if the file must actually be created. If false chances exist that a file with the same name is created in the time between invoking this method and the moment the file is actually created. If possible set to true.
    Returns:
      a File reference to the new temporary file.
    Since:
      Ant 1.7.1

  - ### createTempFile

    public File createTempFile(Project project, String prefix, String suffix, File parentDir, boolean deleteOnExit, boolean createFile)
    Create a temporary file in a given directory.

    The file denoted by the returned abstract pathname did not exist before this method was invoked, any subsequent invocation of this method will yield a different file name.

    If the filesystem where the temporary file is created supports POSIX permissions, the file will only be readable and writable by the current user.

    Parameters:
      `project` - reference to the current Ant project.
      `prefix` - file name prefix.
      `suffix` - file extension; include the '.'.
      `parentDir` - Directory to create the temporary file in; if not specified and `project` is not null then the value of the property `ant.tmpdir` is used if set; otherwise `java.io.tmpdir` is used.
      `deleteOnExit` - whether to set the tempfile for deletion on normal VM exit.
      `createFile` - true if the file must actually be created. If false chances exist that a file with the same name is created in the time between invoking this method and the moment the file is actually created. If possible set to true.
    Returns:
      a File reference to the new temporary file.
    Since:
      Ant 1.9.15

  - ### createTempFile

    @Deprecated public File createTempFile(String prefix, String suffix, File parentDir, boolean deleteOnExit)
    Deprecated.
    since ant 1.7.1 use createTempFile(Project, String, String, File, boolean, boolean) instead.
    Create a File object for a temporary file in a given directory. Without actually creating the file.

    The file denoted by the returned abstract pathname did not exist before this method was invoked, any subsequent invocation of this method will yield a different file name.

    If the filesystem where the temporary file is created supports POSIX permissions, the file will only be readable and writable by the current user.

    Parameters:
      `prefix` - file name prefix.
      `suffix` - file extension; include the '.'.
      `parentDir` - Directory to create the temporary file in; java.io.tmpdir used if not specified.
      `deleteOnExit` - whether to set the tempfile for deletion on normal VM exit.
    Returns:
      a File reference to the new, nonexistent temporary file.

  - ### contentEquals

    public boolean contentEquals(File f1, File f2) throws IOException
    Compares the contents of two files.
    Parameters:
      `f1` - the file whose content is to be compared.
      `f2` - the other file whose content is to be compared.
    Returns:
      true if the content of the files is the same.
    Throws:
      `IOException` - if the files cannot be read.

  - ### contentEquals

    public boolean contentEquals(File f1, File f2, boolean textfile) throws IOException
    Compares the contents of two files.
    Parameters:
      `f1` - the file whose content is to be compared.
      `f2` - the other file whose content is to be compared.
      `textfile` - true if the file is to be treated as a text file and differences in kind of line break are to be ignored.
    Returns:
      true if the content of the files is the same.
    Throws:
      `IOException` - if the files cannot be read.
    Since:
      Ant 1.6.3

  - ### getParentFile

    @Deprecated public File getParentFile(File f)
    Deprecated.
    since 1.7. Just use `File.getParentFile()` directly.
    This was originally an emulation of `File.getParentFile()` for JDK 1.1, but it is now implemented using that method (Ant 1.6.3 onwards).
    Parameters:
      `f` - the file whose parent is required.
    Returns:
      the given file's parent, or null if the file does not have a parent.
    Since:
      1.10

  - ### readFully

    public static String readFully(Reader rdr) throws IOException
    Read from reader till EOF.
    Parameters:
      `rdr` - the reader from which to read.
    Returns:
      the contents read out of the given reader.
    Throws:
      `IOException` - if the contents could not be read out from the reader.

  - ### readFully

    public static String readFully(Reader rdr, int bufferSize) throws IOException
    Read from reader till EOF.
    Parameters:
      `rdr` - the reader from which to read.
      `bufferSize` - the buffer size to use when reading.
    Returns:
      the contents read out of the given reader.
    Throws:
      `IOException` - if the contents could not be read out from the reader.

  - ### safeReadFully

    public static String safeReadFully(Reader reader) throws IOException
    Safe read fully - do not return a null for an empty reader.
    Parameters:
      `reader` - the input to read from.
    Returns:
      the string.
    Throws:
      `IOException` - if unable to read from reader.
    Since:
      Ant 1.7.1

  - ### createNewFile

    public boolean createNewFile(File f) throws IOException
    This was originally an emulation of File.createNewFile for JDK 1.1, but it is now implemented using that method (Ant 1.6.3 onwards).

    This method has historically not guaranteed that the operation was atomic. In its current implementation it is.

    Parameters:
      `f` - the file to be created.
    Returns:
      true if the file did not exist already.
    Throws:
      `IOException` - on error.
    Since:
      Ant 1.5

  - ### createNewFile

    public boolean createNewFile(File f, boolean mkdirs) throws IOException
    Create a new file, optionally creating parent directories.
    Parameters:
      `f` - the file to be created.
      `mkdirs` - `boolean` whether to create parent directories.
    Returns:
      true if the file did not exist already.
    Throws:
      `IOException` - on error.
    Since:
      Ant 1.6.3

  - ### isSymbolicLink

    @Deprecated public boolean isSymbolicLink(File parent, String name) throws IOException
    Deprecated.
    use `Files.isSymbolicLink(Path)` instead
    Checks whether a given file is a symbolic link.

    It doesn't really test for symbolic links but whether the canonical and absolute paths of the file are identical--this may lead to false positives on some platforms.

    Parameters:
      `parent` - the parent directory of the file to test
      `name` - the name of the file to test.
    Returns:
      true if the file is a symbolic link.
    Throws:
      `IOException` - on error.
    Since:
      Ant 1.5

  - ### removeLeadingPath

    public String removeLeadingPath(File leading, File path)
    Removes a leading path from a second path.

    This method uses `normalize(java.lang.String)` under the covers and does not resolve symbolic links.

    Parameters:
      `leading` - The leading path, must not be null, must be absolute.
      `path` - The path to remove from, must not be null, must be absolute.
    Returns:
      path's normalized absolute if it doesn't start with leading; path's path with leading's path removed otherwise.
    Since:
      Ant 1.5

  - ### isLeadingPath

    public boolean isLeadingPath(File leading, File path)
    Learn whether one path "leads" another.

    This method uses `normalize(java.lang.String)` under the covers and does not resolve symbolic links.

    If either path tries to go beyond the file system root (i.e. it contains more ".." segments than can be travelled up) the method will return false.

    Parameters:
      `leading` - The leading path, must not be null, must be absolute.
      `path` - The path to check, must not be null, must be absolute.
    Returns:
      true if path starts with leading; false otherwise.
    Since:
      Ant 1.7

  - ### isLeadingPath

    public boolean isLeadingPath(File leading, File path, boolean resolveSymlinks) throws IOException
    Learn whether one path "leads" another.
    Parameters:
      `leading` - The leading path, must not be null, must be absolute.
      `path` - The path to check, must not be null, must be absolute.
      `resolveSymlinks` - whether symbolic links shall be resolved prior to comparing the paths.
    Returns:
      true if path starts with leading; false otherwise.
    Throws:
      `IOException` - if resolveSymlinks is true and invoking getCanonicaPath on either argument throws an exception
    Since:
      Ant 1.10.5

  - ### toURI

    public String toURI(String path)
    Constructs a `file:` URI that represents the external form of the given pathname.

    Will be an absolute URI if the given path is absolute.

    This code encodes non ASCII characters too.

    The coding of the output is the same as what File.toURI().toASCIIString() produces

    See dt-sysid which makes some mention of how characters not supported by URI Reference syntax should be escaped.
    Parameters:
      `path` - the path in the local file system.
    Returns:
      the URI version of the local path.
    Since:
      Ant 1.6

  - ### fromURI

    public String fromURI(String uri)
    Constructs a file path from a `file:` URI.

    Will be an absolute path if the given URI is absolute.

    Swallows '%' that are not followed by two characters, doesn't deal with non-ASCII characters.

    Parameters:
      `uri` - the URI designating a file in the local filesystem.
    Returns:
      the local file system path for the file.
    Since:
      Ant 1.6

  - ### fileNameEquals

    public boolean fileNameEquals(File f1, File f2)
    Compares two filenames.

    Unlike java.io.File#equals this method will try to compare the absolute paths and "normalize" the filenames before comparing them.

    Parameters:
      `f1` - the file whose name is to be compared.
      `f2` - the other file whose name is to be compared.
    Returns:
      true if the file are for the same file.
    Since:
      Ant 1.5.3

  - ### areSame

    public boolean areSame(File f1, File f2) throws IOException
    Are the two File instances pointing to the same object on the file system?
    Parameters:
      `f1` - File
      `f2` - File
    Returns:
      boolean
    Throws:
      `IOException` - if file name canonicalization fails
    Since:
      Ant 1.8.2

  - ### rename

    public void rename(File from, File to) throws IOException
    Renames a file, even if that involves crossing file system boundaries.

    This will remove `to` (if it exists), ensure that `to`'s parent directory exists and move `from`, which involves deleting `from` as well.

    Parameters:
      `from` - the file to move.
      `to` - the new file name.
    Throws:
      `IOException` - if anything bad happens during this process. Note that `to` may have been deleted already when this happens.
    Since:
      Ant 1.6

  - ### getFileTimestampGranularity

    public long getFileTimestampGranularity()
    Get the granularity of file timestamps. The choice is made based on OS, which is incorrect--it should really be by filesystem. We do not have an easy way to probe for file systems, however, so this heuristic gives us a decent default.
    Returns:
      the difference, in milliseconds, which two file timestamps must have in order for the two files to be considered to have different timestamps.

  - ### hasErrorInCase

    public boolean hasErrorInCase(File localFile)
    test whether a file or directory exists, with an error in the upper/lower case spelling of the name. Using this method is only interesting on case insensitive file systems (Windows).

    It will return true only if 3 conditions are met:

    - operating system is case insensitive
    - file exists
    - actual name from directory reading is different from the supplied argument

    The purpose is to identify files or directories on case-insensitive filesystems whose case is not what is expected.

    Possibly to rename them afterwards to the desired upper/lowercase combination.
    Parameters:
      `localFile` - file to test
    Returns:
      true if the file exists and the case of the actual file is not the case of the parameter
    Since:
      Ant 1.7.1

  - ### isUpToDate

    public boolean isUpToDate(File source, File dest, long granularity)
    Returns true if the source is older than the dest. If the dest file does not exist, then the test returns false; it is implicitly not up do date.
    Parameters:
      `source` - source file (should be the older).
      `dest` - dest file (should be the newer).
      `granularity` - an offset added to the source time.
    Returns:
      true if the source is older than the dest after accounting for granularity.
    Since:
      Ant 1.6.3

  - ### isUpToDate

    public boolean isUpToDate(File source, File dest)
    Returns true if the source is older than the dest.
    Parameters:
      `source` - source file (should be the older).
      `dest` - dest file (should be the newer).
    Returns:
      true if the source is older than the dest, taking the granularity into account.
    Since:
      Ant 1.6.3

  - ### isUpToDate

    public boolean isUpToDate(long sourceTime, long destTime, long granularity)
    Compare two timestamps for being up to date using the specified granularity.
    Parameters:
      `sourceTime` - timestamp of source file.
      `destTime` - timestamp of dest file.
      `granularity` - os/filesys granularity.
    Returns:
      true if the dest file is considered up to date.

  - ### isUpToDate

    public boolean isUpToDate(long sourceTime, long destTime)
    Compare two timestamps for being up to date using the current granularity.
    Parameters:
      `sourceTime` - timestamp of source file.
      `destTime` - timestamp of dest file.
    Returns:
      true if the dest file is considered up to date.

  - ### close

    public static void close(Writer device)
    Close a Writer without throwing any exception if something went wrong. Do not attempt to close it if the argument is null.
    Parameters:
      `device` - output writer, can be null.

  - ### close

    public static void close(Reader device)
    Close a Reader without throwing any exception if something went wrong. Do not attempt to close it if the argument is null.
    Parameters:
      `device` - Reader, can be null.

  - ### close

    public static void close(OutputStream device)
    Close a stream without throwing any exception if something went wrong. Do not attempt to close it if the argument is null.
    Parameters:
      `device` - stream, can be null.

  - ### close

    public static void close(InputStream device)
    Close a stream without throwing any exception if something went wrong. Do not attempt to close it if the argument is null.
    Parameters:
      `device` - stream, can be null.

  - ### close

    public static void close(Channel device)
    Close a Channel without throwing any exception if something went wrong. Do not attempt to close it if the argument is null.
    Parameters:
      `device` - channel, can be null.
    Since:
      Ant 1.8.0

  - ### close

    public static void close(URLConnection conn)
    Closes an URLConnection if its concrete implementation provides a way to close it that Ant knows of.
    Parameters:
      `conn` - connection, can be null
    Since:
      Ant 1.8.0

  - ### close

    public static void close(AutoCloseable ac)
    Close an `AutoCloseable` without throwing any exception if something went wrong. Do not attempt to close it if the argument is null.
    Parameters:
      `ac` - AutoCloseable, can be null.
    Since:
      Ant 1.10.0

  - ### delete

    public static void delete(File file)
    Delete the file with `File.delete()` if the argument is not null. Do nothing on a null argument.
    Parameters:
      `file` - file to delete.

  - ### tryHardToDelete

    public boolean tryHardToDelete(File f)
    Accommodate Windows bug encountered in both Sun and IBM JDKs. Others possible. If the delete does not work, call System.gc(), wait a little and try again.
    Parameters:
      `f` - File
    Returns:
      whether deletion was successful
    Since:
      Ant 1.8.0

  - ### tryHardToDelete

    public boolean tryHardToDelete(File f, boolean runGC)
    If delete does not work, call System.gc() if asked to, wait a little and try again.
    Parameters:
      `f` - File
      `runGC` - boolean
    Returns:
      whether deletion was successful
    Since:
      Ant 1.8.3

  - ### getRelativePath

    public static String getRelativePath(File fromFile, File toFile) throws Exception
    Calculates the relative path between two files.

    Implementation note:
    This function may throw an IOException if an I/O error occurs because its use of the canonical pathname may require filesystem queries.

    Parameters:
      `fromFile` - the `File` to calculate the path from
      `toFile` - the `File` to calculate the path to
    Returns:
      the relative path between the files
    Throws:
      `Exception` - for undocumented reasons
    Since:
      Ant 1.7
    See Also:
      - `File.getCanonicalPath()`

  - ### getPathStack

    public static String[] getPathStack(String path)
    Gets all names of the path as an array of `String`s.
    Parameters:
      `path` - to get names from
    Returns:
      `String`s, never `null`
    Since:
      Ant 1.7

  - ### getPath

    public static String getPath(List<String> pathStack)
    Gets path from a `List` of `String`s.
    Parameters:
      `pathStack` - `List` of `String`s to be concatenated as a path.
    Returns:
      `String`, never `null`
    Since:
      Ant 1.7

  - ### getPath

    public static String getPath(List<String> pathStack, char separatorChar)
    Gets path from a `List` of `String`s.
    Parameters:
      `pathStack` - `List` of `String`s to be concatenated as a path.
      `separatorChar` - `char` to be used as separator between names in path
    Returns:
      `String`, never `null`
    Since:
      Ant 1.7

  - ### getDefaultEncoding

    public String getDefaultEncoding()
    Get the default encoding. This is done by opening an InputStreamReader on a dummy InputStream and getting the encoding. Could use System.getProperty("file.encoding"), but cannot see where this is documented.
    Returns:
      the default file encoding.

  - ### newOutputStream

    public static OutputStream newOutputStream(Path path, boolean append) throws IOException
    Opens a new OutputStream for the given Path.
    Parameters:
      `path` - the path of the file
      `append` - whether to append to or a replace an existing file
    Returns:
      a stream ready to write to the file
    Throws:
      `IOException` - if stream creation fails
    Since:
      Ant 1.10.2

  - ### isCaseSensitiveFileSystem

    public static Optional<Boolean> isCaseSensitiveFileSystem(Path path)
    Tries to determine the case sensitivity of the filesystem corresponding to the `path`. While doing so, this method might create a temporary file under the directory represented by the `path`, if it's a directory or in the parent directory of the `path`, if it's a file.

    This method works on a best effort basis and will return an `Optional.empty()` if it cannot determine the case sensitivity, either due to exception or for any other reason.

    Parameters:
      `path` - The path whose filesystem case sensitivity needs to be checked
    Returns:
      Returns true if the filesystem corresponding to the passed `path` is case sensitive. Else returns false. If the case sensitivity cannot be determined for whatever reason, this method returns an `Optional.empty()`
    Throws:
      `IllegalArgumentException` - If the passed path is null
    Since:
      Ant 1.10.6