Package org.eclipse.jgit.util

Class FileUtils

  • public class FileUtils
extends Object
    File Utilities

    • Field Detail

      • RECURSIVE

        public static final int RECURSIVE
        Option to recursively delete given File
        See Also:
        Constant Field Values

      • RETRY

        public static final int RETRY
        Option to retry deletion if not successful
        See Also:
        Constant Field Values

      • SKIP_MISSING

        public static final int SKIP_MISSING
        Option to skip deletion if file doesn't exist
        See Also:
        Constant Field Values

      • IGNORE_ERRORS

        public static final int IGNORE_ERRORS
        Option not to throw exceptions when a deletion finally doesn't succeed.
        Since:
        2.0
        See Also:
        Constant Field Values

      • EMPTY_DIRECTORIES_ONLY

        public static final int EMPTY_DIRECTORIES_ONLY
        Option to only delete empty directories. This option can be combined with RECURSIVE
        Since:
        3.0
        See Also:
        Constant Field Values

    • Constructor Detail

      • FileUtils

        public FileUtils()

    • Method Detail

      • toPath

        public static Path toPath​(File f)
                   throws IOException
        Safe conversion from File to Path.
        Parameters:
        f - File to be converted to Path
        Returns:
        the path represented by the file
        Throws:
        IOException - in case the path represented by the file is not valid ( InvalidPathException)
        Since:
        4.10

      • delete

        public static void delete​(File f)
                   throws IOException
        Delete file or empty folder
        Parameters:
        f - File to be deleted
        Throws:
        IOException - if deletion of f fails. This may occur if f didn't exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to delete the same file.

      • delete

        public static void delete​(File f,
                          int options)
                   throws IOException
        Delete file or folder
        Parameters:
        f - File to be deleted
        options - deletion options, RECURSIVE for recursive deletion of a subtree, RETRY to retry when deletion failed. Retrying may help if the underlying file system doesn't allow deletion of files being read by another thread.
        Throws:
        IOException - if deletion of f fails. This may occur if f didn't exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to delete the same file. This exception is not thrown when IGNORE_ERRORS is set.

      • rename

        public static void rename​(File src,
                          File dst)
                   throws IOException
        Rename a file or folder. If the rename fails and if we are running on a filesystem where it makes sense to repeat a failing rename then repeat the rename operation up to 9 times with 100ms sleep time between two calls. Furthermore if the destination exists and is directory hierarchy with only directories in it, the whole directory hierarchy will be deleted. If the target represents a non-empty directory structure, empty subdirectories within that structure may or may not be deleted even if the method fails. Furthermore if the destination exists and is a file then the file will be deleted and then the rename is retried.

        This operation is not atomic.

        Parameters:
        src - the old File
        dst - the new File
        Throws:
        IOException - if the rename has failed
        Since:
        3.0
        See Also:
        FS.retryFailedLockFileCommit()

      • mkdir

        public static void mkdir​(File d)
                  throws IOException
        Creates the directory named by this abstract pathname.
        Parameters:
        d - directory to be created
        Throws:
        IOException - if creation of d fails. This may occur if d did exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to create the same directory.

      • mkdir

        public static void mkdir​(File d,
                         boolean skipExisting)
                  throws IOException
        Creates the directory named by this abstract pathname.
        Parameters:
        d - directory to be created
        skipExisting - if true skip creation of the given directory if it already exists in the file system
        Throws:
        IOException - if creation of d fails. This may occur if d did exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to create the same directory.

      • mkdirs

        public static void mkdirs​(File d)
                   throws IOException
        Creates the directory named by this abstract pathname, including any necessary but nonexistent parent directories. Note that if this operation fails it may have succeeded in creating some of the necessary parent directories.
        Parameters:
        d - directory to be created
        Throws:
        IOException - if creation of d fails. This may occur if d did exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to create the same directory.

      • mkdirs

        public static void mkdirs​(File d,
                          boolean skipExisting)
                   throws IOException
        Creates the directory named by this abstract pathname, including any necessary but nonexistent parent directories. Note that if this operation fails it may have succeeded in creating some of the necessary parent directories.
        Parameters:
        d - directory to be created
        skipExisting - if true skip creation of the given directory if it already exists in the file system
        Throws:
        IOException - if creation of d fails. This may occur if d did exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to create the same directory.

      • createNewFile

        public static void createNewFile​(File f)
                          throws IOException
        Atomically creates a new, empty file named by this abstract pathname if and only if a file with this name does not yet exist. The check for the existence of the file and the creation of the file if it does not exist are a single operation that is atomic with respect to all other filesystem activities that might affect the file.

        Note: this method should not be used for file-locking, as the resulting protocol cannot be made to work reliably. The FileLock facility should be used instead.

        Parameters:
        f - the file to be created
        Throws:
        IOException - if the named file already exists or if an I/O error occurred

      • createSymLink

        public static Path createSymLink​(File path,
                                 String target)
                          throws IOException
        Create a symbolic link
        Parameters:
        path - the path of the symbolic link to create
        target - the target of the symbolic link
        Returns:
        the path to the symbolic link
        Throws:
        IOException
        Since:
        4.2

      • readSymLink

        public static String readSymLink​(File path)
                          throws IOException
        Read target path of the symlink.
        Parameters:
        path - a File object.
        Returns:
        target path of the symlink, or null if it is not a symbolic link
        Throws:
        IOException
        Since:
        3.0

      • createTempDir

        public static File createTempDir​(String prefix,
                                 String suffix,
                                 File dir)
                          throws IOException
        Create a temporary directory.
        Parameters:
        prefix - prefix string
        suffix - suffix string
        dir - The parent dir, can be null to use system default temp dir.
        Returns:
        the temp dir created.
        Throws:
        IOException
        Since:
        3.4

      • relativizeNativePath

        public static String relativizeNativePath​(String base,
                                          String other)
        Expresses other as a relative file path from base. File-separator and case sensitivity are based on the current file system. See also relativizePath(String, String, String, boolean).
        Parameters:
        base - Base path
        other - Destination path
        Returns:
        Relative path from base to other
        Since:
        4.8

      • relativizeGitPath

        public static String relativizeGitPath​(String base,
                                       String other)
        Expresses other as a relative file path from base. File-separator and case sensitivity are based on Git's internal representation of files (which matches Unix). See also relativizePath(String, String, String, boolean).
        Parameters:
        base - Base path
        other - Destination path
        Returns:
        Relative path from base to other
        Since:
        4.8

      • relativizePath

        public static String relativizePath​(String base,
                                    String other,
                                    String dirSeparator,
                                    boolean caseSensitive)
        Expresses other as a relative file path from base

        For example, if called with the two following paths : 

         base = "c:\\Users\\jdoe\\eclipse\\git\\project"
 other = "c:\\Users\\jdoe\\eclipse\\git\\another_project\\pom.xml"
        This will return "..\\another_project\\pom.xml".

        Note that this will return the empty String if base and other are equal.

        Parameters:
        base - The path against which other should be relativized. This will be assumed to denote the path to a folder and not a file.
        other - The path that will be made relative to base.
        dirSeparator - A string that separates components of the path. In practice, this is "/" or "\\".
        caseSensitive - Whether to consider differently-cased directory names as distinct
        Returns:
        A relative path that, when resolved against base, will yield the original other.
        Since:
        4.8

      • isStaleFileHandle

        public static boolean isStaleFileHandle​(IOException ioe)
        Determine if an IOException is a Stale NFS File Handle
        Parameters:
        ioe - an IOException object.
        Returns:
        a boolean true if the IOException is a Stale NFS FIle Handle
        Since:
        4.1

      • isStaleFileHandleInCausalChain

        public static boolean isStaleFileHandleInCausalChain​(Throwable throwable)
        Determine if a throwable or a cause in its causal chain is a Stale NFS File Handle
        Parameters:
        throwable - a Throwable object.
        Returns:
        a boolean true if the throwable or a cause in its causal chain is a Stale NFS File Handle
        Since:
        4.7

      • readWithRetries

        public static <T> T readWithRetries​(File file,
                                    FileUtils.IOFunction<File,​? extends T> reader)
                             throws Exception
        Invokes the given FileUtils.IOFunction, performing a limited number of re-tries if exceptions occur that indicate either a stale NFS file handle or that indicate that the file may be written concurrently.
        Type Parameters:
        T - result type
        Parameters:
        file - to read
        reader - for reading the file and creating an instance of T
        Returns:
        the result of the reader, or null if the file does not exist
        Throws:
        Exception - if a problem occurs
        Since:
        6.2

      • setHidden

        public static void setHidden​(File file,
                             boolean hidden)
                      throws IOException
        Set a file hidden (on Windows)
        Parameters:
        file - a File object.
        hidden - a boolean.
        Throws:
        IOException
        Since:
        4.1

      • getLength

        public static long getLength​(File file)
                      throws IOException
        Get file length
        Parameters:
        file - a File.
        Returns:
        length of the given file
        Throws:
        IOException
        Since:
        4.1

      • hasFiles

        public static boolean hasFiles​(Path dir)
                        throws IOException
        Whether the path is a directory with files in it.
        Parameters:
        dir - directory path
        Returns:
        true if the given directory path contains files
        Throws:
        IOException - on any I/O errors accessing the path
        Since:
        5.11

      • canExecute

        public static boolean canExecute​(File file)
        Whether the given file can be executed.
        Parameters:
        file - a File object.
        Returns:
        true if the given file can be executed.
        Since:
        4.1

      • getFileAttributesPosix

        public static FS.Attributes getFileAttributesPosix​(FS fs,
                                                   File file)
        Get file system attributes for the given file.
        Parameters:
        fs - a FS object.
        file - a File.
        Returns:
        file system attributes for the given file.
        Since:
        4.1

      • normalize

        public static File normalize​(File file)
        NFC normalize a file (on Mac), otherwise do nothing
        Parameters:
        file - a File.
        Returns:
        on Mac: NFC normalized File, otherwise the passed file
        Since:
        4.1

      • normalize

        public static String normalize​(String name)
        On Mac: get NFC normalized form of given name, otherwise the given name.
        Parameters:
        name - a String object.
        Returns:
        on Mac: NFC normalized form of given name
        Since:
        4.1

      • canonicalize

        public static File canonicalize​(File file)
        Best-effort variation of File.getCanonicalFile() returning the input file if the file cannot be canonicalized instead of throwing IOException.
        Parameters:
        file - to be canonicalized; may be null
        Returns:
        canonicalized file, or the unchanged input file if canonicalization failed or if file == null
        Throws:
        SecurityException - if File.getCanonicalFile() throws one
        Since:
        4.2

      • pathToString

        public static String pathToString​(File file)
        Convert a path to String, replacing separators as necessary.
        Parameters:
        file - a File.
        Returns:
        file's path as a String
        Since:
        4.10

      • touch

        public static void touch​(Path f)
                  throws IOException
        Touch the given file
        Parameters:
        f - the file to touch
        Throws:
        IOException
        Since:
        5.1.8

      • delay

        public static long delay​(long last,
                         long min,
                         long max)
        Compute a delay in a min..max interval with random jitter.
        Parameters:
        last - amount of delay waited before the last attempt. This is used to seed the next delay interval. Should be 0 if there was no prior delay.
        min - shortest amount of allowable delay between attempts.
        max - longest amount of allowable delay between attempts.
        Returns:
        new amount of delay to wait before the next attempt.
        Since:
        5.6