FileUtils (Unitils core module 3.1 API)

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org.unitils.thirdparty.org.apache.commons.io
Class FileUtils

java.lang.Object
  org.unitils.thirdparty.org.apache.commons.io.FileUtils

public class FileUtils
extends java.lang.Object
extends java.lang.Object

General file manipulation utilities.

Facilities are provided in the following areas:

writing to a file
reading from a file
make a directory including parent directories
copying files and directories
deleting files and directories
converting to and from a URL
listing files and directories by filter and extension
comparing file content
file last changed date

Origin of code: Excalibur, Alexandria, Commons-Utils

Version:: $Id: FileUtils.java 384037 2006-03-07 22:26:37Z scolebourne $
Author:: Kevin A. Burton, Scott Sanders, Daniel Rall, Christoph.Reck, Peter Donald, Jeff Turner, Matthew Hawthorne, Jeremias Maerki, Stephen Colebourne, Ian Springer, Chris Eldredge, Jim Harrington, Niall Pemberton, Sandy McArthur

Field Summary
`static java.io.File[]`	`EMPTY_FILE_ARRAY` An empty array of type `File`.
`static long`	`ONE_GB` The number of bytes in a gigabyte.
`static long`	`ONE_KB` The number of bytes in a kilobyte.
`static long`	`ONE_MB` The number of bytes in a megabyte.

Constructor Summary
`FileUtils()` Instances should NOT be constructed in standard programming.

Method Summary
`static java.lang.String`	`byteCountToDisplaySize(long size)` Returns a human-readable version of the file size, where the input represents a specific number of bytes.
`static void`	`cleanDirectory(java.io.File directory)` Clean a directory without deleting it.
`static boolean`	`contentEquals(java.io.File file1, java.io.File file2)` Compare the contents of two files to determine if they are equal or not.
`static java.io.File[]`	`convertFileCollectionToFileArray(java.util.Collection<?> files)` Converts a Collection containing java.io.File instanced into array representation.
`static void`	`copyDirectory(java.io.File srcDir, java.io.File destDir)` Copies a whole directory to a new location preserving the file dates.
`static void`	`copyDirectory(java.io.File srcDir, java.io.File destDir, boolean preserveFileDate)` Copies a whole directory to a new location.
`static void`	`copyDirectoryToDirectory(java.io.File srcDir, java.io.File destDir)` Copies a directory to within another directory preserving the file dates.
`static void`	`copyFile(java.io.File srcFile, java.io.File destFile)` Copies a file to a new location preserving the file date.
`static void`	`copyFile(java.io.File srcFile, java.io.File destFile, boolean preserveFileDate)` Copies a file to a new location.
`static void`	`copyFileToDirectory(java.io.File srcFile, java.io.File destDir)` Copies a file to a directory preserving the file date.
`static void`	`copyURLToFile(java.net.URL source, java.io.File destination)` Copies bytes from the URL `source` to a file `destination`.
`static void`	`deleteDirectory(java.io.File directory)` Recursively delete a directory.
`static void`	`forceDelete(java.io.File file)` Delete a file.
`static void`	`forceDeleteOnExit(java.io.File file)` Schedule a file to be deleted when JVM exits.
`static void`	`forceMkdir(java.io.File directory)` Make a directory, including any necessary but nonexistent parent directories.
`static boolean`	`isFileNewer(java.io.File file, java.util.Date date)` Tests if the specified `File` is newer than the specified `Date`.
`static boolean`	`isFileNewer(java.io.File file, java.io.File reference)` Tests if the specified `File` is newer than the reference `File`.
`static boolean`	`isFileNewer(java.io.File file, long timeMillis)` Tests if the specified `File` is newer than the specified time reference.
`static java.lang.String`	`readFileToString(java.io.File file, java.lang.String encoding)` Reads the contents of a file into a String.
`static java.util.List`	`readLines(java.io.File file, java.lang.String encoding)` Reads the contents of a file line by line to a List of Strings.
`static long`	`sizeOfDirectory(java.io.File directory)` Recursively count size of a directory (sum of the length of all files).
`static java.io.File`	`toFile(java.net.URL url)` Convert from a `URL` to a `File`.
`static java.io.File[]`	`toFiles(java.net.URL[] urls)` Converts each of an array of `URL` to a `File`.
`static void`	`touch(java.io.File file)` Implements the same behaviour as the "touch" utility on Unix.
`static java.net.URL[]`	`toURLs(java.io.File[] files)` Converts each of an array of `File` to a `URL`.
`static boolean`	`waitFor(java.io.File file, int seconds)` Waits for NFS to propagate a file creation, imposing a timeout.
`static void`	`writeByteArrayToFile(java.io.File file, byte[] data)` Writes a byte array to a file creating the file if it does not exist.
`static void`	`writeLines(java.io.File file, java.lang.String encoding, java.util.Collection<?> lines)` Writes the `toString()` value of each item in a collection to the specified `File` line by line.
`static void`	`writeLines(java.io.File file, java.lang.String encoding, java.util.Collection<?> lines, java.lang.String lineEnding)` Writes the `toString()` value of each item in a collection to the specified `File` line by line.
`static void`	`writeStringToFile(java.io.File file, java.lang.String data, java.lang.String encoding)` Writes a String to a file creating the file if it does not exist.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

ONE_KB

public static final long ONE_KB

The number of bytes in a kilobyte.

See Also:: Constant Field Values

ONE_MB

public static final long ONE_MB

The number of bytes in a megabyte.

See Also:: Constant Field Values

ONE_GB

public static final long ONE_GB

The number of bytes in a gigabyte.

See Also:: Constant Field Values

EMPTY_FILE_ARRAY

public static final java.io.File[] EMPTY_FILE_ARRAY

An empty array of type File.

Constructor Detail

FileUtils

public FileUtils()

Instances should NOT be constructed in standard programming.

Method Detail

byteCountToDisplaySize

public static java.lang.String byteCountToDisplaySize(long size)

Returns a human-readable version of the file size, where the input represents a specific number of bytes.

Parameters:: size - the number of bytes
Returns:: a human-readable display value (includes units)

touch

public static void touch(java.io.File file)
                  throws java.io.IOException

Implements the same behaviour as the "touch" utility on Unix. It creates a new file with size 0 or, if the file exists already, it is opened and closed without modifying it, but updating the file date and time.

Parameters:: file - the File to touch
Throws:: java.io.IOException - If an I/O problem occurs

convertFileCollectionToFileArray

public static java.io.File[] convertFileCollectionToFileArray(java.util.Collection<?> files)

Converts a Collection containing java.io.File instanced into array representation. This is to account for the difference between File.listFiles() and FileUtils.listFiles().

Parameters:: files - a Collection containing java.io.File instances
Returns:: an array of java.io.File

contentEquals

public static boolean contentEquals(java.io.File file1,
                                    java.io.File file2)
                             throws java.io.IOException

Compare the contents of two files to determine if they are equal or not.

This method checks to see if the two files are different lengths or if they point to the same file, before resorting to byte-by-byte comparison of the contents.

Code origin: Avalon

Parameters:: file1 - the first file; file2 - the second file
Returns:: true if the content of the files are equal or they both don't exist, false otherwise
Throws:: java.io.IOException - in case of an I/O error

toFile

public static java.io.File toFile(java.net.URL url)

Convert from a URL to a File.

From version 1.1 this method will decode the URL. Syntax such as file:///my%20docs/file.txt will be correctly decoded to /my docs/file.txt.

Parameters:: url - the file URL to convert, null returns null
Returns:: the equivalent File object, or null if the URL's protocol is not file
Throws:: java.lang.IllegalArgumentException - if the file is incorrectly encoded

toFiles

public static java.io.File[] toFiles(java.net.URL[] urls)

Converts each of an array of URL to a File.

Returns an array of the same size as the input. If the input is null, an empty array is returned. If the input contains null, the output array contains null at the same index.

This method will decode the URL. Syntax such as file:///my%20docs/file.txt will be correctly decoded to /my docs/file.txt.

Parameters:: urls - the file URLs to convert, null returns empty array
Returns:: a non-null array of Files matching the input, with a null item if there was a null at that index in the input array
Throws:: java.lang.IllegalArgumentException - if any file is not a URL file; java.lang.IllegalArgumentException - if any file is incorrectly encoded
Since:: Commons IO 1.1

toURLs

public static java.net.URL[] toURLs(java.io.File[] files)
                             throws java.io.IOException

Converts each of an array of File to a URL.

Returns an array of the same size as the input.

Parameters:: files - the files to convert
Returns:: an array of URLs matching the input
Throws:: java.io.IOException - if a file cannot be converted

copyFileToDirectory

public static void copyFileToDirectory(java.io.File srcFile,
                                       java.io.File destDir)
                                throws java.io.IOException

Copies a file to a directory preserving the file date.

This method copies the contents of the specified source file to a file of the same name in the specified destination directory. The destination directory is created if it does not exist. If the destination file exists, then this method will overwrite it.

Parameters:: srcFile - an existing file to copy, must not be null; destDir - the directory to place the copy in, must not be null
Throws:: java.lang.NullPointerException - if source or destination is null; java.io.IOException - if source or destination is invalid; java.io.IOException - if an IO error occurs during copying
See Also:: copyFile(File, File, boolean)

copyFile

public static void copyFile(java.io.File srcFile,
                            java.io.File destFile)
                     throws java.io.IOException

Copies a file to a new location preserving the file date.

This method copies the contents of the specified source file to the specified destination file. The directory holding the destination file is created if it does not exist. If the destination file exists, then this method will overwrite it.

Parameters:: srcFile - an existing file to copy, must not be null; destFile - the new file, must not be null
Throws:: java.lang.NullPointerException - if source or destination is null; java.io.IOException - if source or destination is invalid; java.io.IOException - if an IO error occurs during copying
See Also:: copyFileToDirectory(java.io.File, java.io.File)

copyFile

public static void copyFile(java.io.File srcFile,
                            java.io.File destFile,
                            boolean preserveFileDate)
                     throws java.io.IOException

Copies a file to a new location.

Parameters:: srcFile - an existing file to copy, must not be null; destFile - the new file, must not be null; preserveFileDate - true if the file date of the copy should be the same as the original
Throws:: java.lang.NullPointerException - if source or destination is null; java.io.IOException - if source or destination is invalid; java.io.IOException - if an IO error occurs during copying
See Also:: copyFileToDirectory(java.io.File, java.io.File)

copyDirectoryToDirectory

public static void copyDirectoryToDirectory(java.io.File srcDir,
                                            java.io.File destDir)
                                     throws java.io.IOException

Copies a directory to within another directory preserving the file dates.

This method copies the source directory and all its contents to a directory of the same name in the specified destination directory.

The destination directory is created if it does not exist. If the destination directory did exist, then this method merges the source with the destination, with the source taking precedence.

Parameters:: srcDir - an existing directory to copy, must not be null; destDir - the directory to place the copy in, must not be null
Throws:: java.lang.NullPointerException - if source or destination is null; java.io.IOException - if source or destination is invalid; java.io.IOException - if an IO error occurs during copying
Since:: Commons IO 1.2

copyDirectory

public static void copyDirectory(java.io.File srcDir,
                                 java.io.File destDir)
                          throws java.io.IOException

Copies a whole directory to a new location preserving the file dates.

This method copies the specified directory and all its child directories and files to the specified destination. The destination is the new location and name of the directory.

The destination directory is created if it does not exist. If the destination directory did exist, then this method merges the source with the destination, with the source taking precedence.

Parameters:: srcDir - an existing directory to copy, must not be null; destDir - the new directory, must not be null
Throws:: java.lang.NullPointerException - if source or destination is null; java.io.IOException - if source or destination is invalid; java.io.IOException - if an IO error occurs during copying
Since:: Commons IO 1.1

copyDirectory

public static void copyDirectory(java.io.File srcDir,
                                 java.io.File destDir,
                                 boolean preserveFileDate)
                          throws java.io.IOException

Copies a whole directory to a new location.

This method copies the contents of the specified source directory to within the specified destination directory.

The destination directory is created if it does not exist. If the destination directory did exist, then this method merges the source with the destination, with the source taking precedence.

Parameters:: srcDir - an existing directory to copy, must not be null; destDir - the new directory, must not be null; preserveFileDate - true if the file date of the copy should be the same as the original
Throws:: java.lang.NullPointerException - if source or destination is null; java.io.IOException - if source or destination is invalid; java.io.IOException - if an IO error occurs during copying
Since:: Commons IO 1.1

copyURLToFile

public static void copyURLToFile(java.net.URL source,
                                 java.io.File destination)
                          throws java.io.IOException

Copies bytes from the URL source to a file destination. The directories up to destination will be created if they don't already exist. destination will be overwritten if it already exists.

Parameters:

source - A URL to copy bytes from.

destination - A non-directory File to write bytes to (possibly overwriting).

Throws:

java.io.IOException - if

source URL cannot be opened
destination cannot be written to
an IO error occurs during copying

deleteDirectory

public static void deleteDirectory(java.io.File directory)
                            throws java.io.IOException

Recursively delete a directory.

Parameters:: directory - directory to delete
Throws:: java.io.IOException - in case deletion is unsuccessful

cleanDirectory

public static void cleanDirectory(java.io.File directory)
                           throws java.io.IOException

Clean a directory without deleting it.

Parameters:: directory - directory to clean
Throws:: java.io.IOException - in case cleaning is unsuccessful

waitFor

public static boolean waitFor(java.io.File file,
                              int seconds)

Waits for NFS to propagate a file creation, imposing a timeout.

This method repeatedly tests File.exists() until it returns true up to the maximum time specified in seconds.

Parameters:: file - the file to check, not null; seconds - the maximum time in seconds to wait
Returns:: true if file exists
Throws:: java.lang.NullPointerException - if the file is null

readFileToString

public static java.lang.String readFileToString(java.io.File file,
                                                java.lang.String encoding)
                                         throws java.io.IOException

Reads the contents of a file into a String. The file is always closed.

There is no readFileToString method without encoding parameter because the default encoding can differ between platforms and will have inconsistent results.

Parameters:: file - the file to read; encoding - the encoding to use, null means platform default
Returns:: the file contents or null if read failed
Throws:: java.io.IOException - in case of an I/O error; java.io.UnsupportedEncodingException - if the encoding is not supported by the VM

readLines

public static java.util.List readLines(java.io.File file,
                                       java.lang.String encoding)
                                throws java.io.IOException

Reads the contents of a file line by line to a List of Strings. The file is always closed.

There is no readLines method without encoding parameter because the default encoding can differ between platforms and will have inconsistent results.

Parameters:: file - the file to read; encoding - the encoding to use, null means platform default
Returns:: the list of Strings representing each line in the file
Throws:: java.io.IOException - in case of an I/O error; java.io.UnsupportedEncodingException - if the encoding is not supported by the VM
Since:: Commons IO 1.1

writeStringToFile

public static void writeStringToFile(java.io.File file,
                                     java.lang.String data,
                                     java.lang.String encoding)
                              throws java.io.IOException

Writes a String to a file creating the file if it does not exist.

There is no writeStringToFile method without encoding parameter because the default encoding can differ between platforms and will have inconsistent results.

Parameters:: file - the file to write; data - the content to write to the file; encoding - the encoding to use, null means platform default
Throws:: java.io.IOException - in case of an I/O error; java.io.UnsupportedEncodingException - if the encoding is not supported by the VM

writeByteArrayToFile

public static void writeByteArrayToFile(java.io.File file,
                                        byte[] data)
                                 throws java.io.IOException

Writes a byte array to a file creating the file if it does not exist.

Parameters:: file - the file to write to; data - the content to write to the file
Throws:: java.io.IOException - in case of an I/O error
Since:: Commons IO 1.1

writeLines

public static void writeLines(java.io.File file,
                              java.lang.String encoding,
                              java.util.Collection<?> lines)
                       throws java.io.IOException

Writes the toString() value of each item in a collection to the specified File line by line. The specified character encoding and the default line ending will be used.

There is no writeLines method without encoding parameter because the default encoding can differ between platforms and will have inconsistent results.

Parameters:: file - the file to write to; encoding - the encoding to use, null means platform default; lines - the lines to write, null entries produce blank lines
Throws:: java.io.IOException - in case of an I/O error; java.io.UnsupportedEncodingException - if the encoding is not supported by the VM
Since:: Commons IO 1.1

writeLines

public static void writeLines(java.io.File file,
                              java.lang.String encoding,
                              java.util.Collection<?> lines,
                              java.lang.String lineEnding)
                       throws java.io.IOException

Writes the toString() value of each item in a collection to the specified File line by line. The specified character encoding and the line ending will be used.

There is no writeLines method without encoding parameter because the default encoding can differ between platforms and will have inconsistent results.

Parameters:: file - the file to write to; encoding - the encoding to use, null means platform default; lines - the lines to write, null entries produce blank lines; lineEnding - the line separator to use, null is system default
Throws:: java.io.IOException - in case of an I/O error; java.io.UnsupportedEncodingException - if the encoding is not supported by the VM
Since:: Commons IO 1.1

forceDelete

public static void forceDelete(java.io.File file)
                        throws java.io.IOException

Delete a file. If file is a directory, delete it and all sub-directories.

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

A directory to be deleted does not have to be empty.
You get exceptions when a file or directory cannot be deleted. (java.io.File methods returns a boolean)

Parameters:: file - file or directory to delete, not null
Throws:: java.lang.NullPointerException - if the directory is null; java.io.IOException - in case deletion is unsuccessful

forceDeleteOnExit

public static void forceDeleteOnExit(java.io.File file)
                              throws java.io.IOException

Schedule a file to be deleted when JVM exits. If file is directory delete it and all sub-directories.

Parameters:: file - file or directory to delete, not null
Throws:: java.lang.NullPointerException - if the file is null; java.io.IOException - in case deletion is unsuccessful

forceMkdir

public static void forceMkdir(java.io.File directory)
                       throws java.io.IOException

Make a directory, including any necessary but nonexistent parent directories. If there already exists a file with specified name or the directory cannot be created then an exception is thrown.

Parameters:: directory - directory to create, not null
Throws:: java.lang.NullPointerException - if the directory is null; java.io.IOException - if the directory cannot be created

sizeOfDirectory

public static long sizeOfDirectory(java.io.File directory)

Recursively count size of a directory (sum of the length of all files).

Parameters:: directory - directory to inspect, not null
Returns:: size of directory in bytes, 0 if directory is security restricted
Throws:: java.lang.NullPointerException - if the directory is null

isFileNewer

public static boolean isFileNewer(java.io.File file,
                                  java.io.File reference)

Tests if the specified File is newer than the reference File.

Parameters:: file - the File of which the modification date must be compared, not null; reference - the File of which the modification date is used, not null
Returns:: true if the File exists and has been modified more recently than the reference File
Throws:: java.lang.IllegalArgumentException - if the file is null; java.lang.IllegalArgumentException - if the reference file is null or doesn't exist

isFileNewer

public static boolean isFileNewer(java.io.File file,
                                  java.util.Date date)

Tests if the specified File is newer than the specified Date.

Parameters:: file - the File of which the modification date must be compared, not null; date - the date reference, not null
Returns:: true if the File exists and has been modified after the given Date.
Throws:: java.lang.IllegalArgumentException - if the file is null; java.lang.IllegalArgumentException - if the date is null

isFileNewer

public static boolean isFileNewer(java.io.File file,
                                  long timeMillis)

Tests if the specified File is newer than the specified time reference.

Parameters:: file - the File of which the modification date must be compared, not null; timeMillis - the time reference measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970)
Returns:: true if the File exists and has been modified after the given time reference.
Throws:: java.lang.IllegalArgumentException - if the file is null

Overview

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SUMMARY: NESTED | FIELD | CONSTR | METHOD

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org.unitils.thirdparty.org.apache.commons.io Class FileUtils

ONE_KB

ONE_MB

ONE_GB

EMPTY_FILE_ARRAY

FileUtils

byteCountToDisplaySize

touch

convertFileCollectionToFileArray

contentEquals

toFile

toFiles

toURLs

copyFileToDirectory

copyFile

copyFile

copyDirectoryToDirectory

copyDirectory

copyDirectory

copyURLToFile

deleteDirectory

cleanDirectory

waitFor

readFileToString

readLines

writeStringToFile

writeByteArrayToFile

writeLines

writeLines

forceDelete

forceDeleteOnExit

forceMkdir

sizeOfDirectory

isFileNewer

isFileNewer

isFileNewer

org.unitils.thirdparty.org.apache.commons.io
Class FileUtils