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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.io;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.math.BigInteger;
import java.net.URL;
import java.net.URLConnection;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;
import java.util.zip.Checksum;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.output.NullOutputStream;
/**
* 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
*
- calculating a checksum
*
*
* Origin of code: Excalibur, Alexandria, Commons-Utils
*
* @version $Id: FileUtils.java 1304052 2012-03-22 20:55:29Z ggregory $
*/
public class FileUtils {
/**
* Instances should NOT be constructed in standard programming.
*/
public FileUtils() {
super();
}
/**
* The number of bytes in a kilobyte.
*/
public static final long ONE_KB = 1024;
/**
* The number of bytes in a megabyte.
*/
public static final long ONE_MB = ONE_KB * ONE_KB;
/**
* The file copy buffer size (30 MB)
*/
private static final long FILE_COPY_BUFFER_SIZE = ONE_MB * 30;
/**
* The number of bytes in a gigabyte.
*/
public static final long ONE_GB = ONE_KB * ONE_MB;
/**
* The number of bytes in a terabyte.
*/
public static final long ONE_TB = ONE_KB * ONE_GB;
/**
* The number of bytes in a petabyte.
*/
public static final long ONE_PB = ONE_KB * ONE_TB;
/**
* The number of bytes in an exabyte.
*/
public static final long ONE_EB = ONE_KB * ONE_PB;
/**
* The number of bytes in a zettabyte.
*/
public static final BigInteger ONE_ZB = BigInteger.valueOf(ONE_KB).multiply(BigInteger.valueOf(ONE_EB));
/**
* The number of bytes in a yottabyte.
*/
public static final BigInteger ONE_YB = ONE_ZB.multiply(BigInteger.valueOf(ONE_EB));
/**
* An empty array of type File.
*/
public static final File[] EMPTY_FILE_ARRAY = new File[0];
/**
* The UTF-8 character set, used to decode octets in URLs.
*/
private static final Charset UTF8 = Charset.forName("UTF-8");
//-----------------------------------------------------------------------
/**
* Construct a file from the set of name elements.
*
* @param directory the parent directory
* @param names the name elements
* @return the file
* @since 2.1
*/
public static File getFile(File directory, String... names) {
if (directory == null) {
throw new NullPointerException("directorydirectory must not be null");
}
if (names == null) {
throw new NullPointerException("names must not be null");
}
File file = directory;
for (String name : names) {
file = new File(file, name);
}
return file;
}
/**
* Construct a file from the set of name elements.
*
* @param names the name elements
* @return the file
* @since 2.1
*/
public static File getFile(String... names) {
if (names == null) {
throw new NullPointerException("names must not be null");
}
File file = null;
for (String name : names) {
if (file == null) {
file = new File(name);
} else {
file = new File(file, name);
}
}
return file;
}
/**
* Returns the path to the system temporary directory.
*
* @return the path to the system temporary directory.
*
* @since 2.0
*/
public static String getTempDirectoryPath() {
return System.getProperty("java.io.tmpdir");
}
/**
* Returns a {@link File} representing the system temporary directory.
*
* @return the system temporary directory.
*
* @since 2.0
*/
public static File getTempDirectory() {
return new File(getTempDirectoryPath());
}
/**
* Returns the path to the user's home directory.
*
* @return the path to the user's home directory.
*
* @since 2.0
*/
public static String getUserDirectoryPath() {
return System.getProperty("user.home");
}
/**
* Returns a {@link File} representing the user's home directory.
*
* @return the user's home directory.
*
* @since 2.0
*/
public static File getUserDirectory() {
return new File(getUserDirectoryPath());
}
//-----------------------------------------------------------------------
/**
* Opens a {@link FileInputStream} for the specified file, providing better
* error messages than simply calling new FileInputStream(file).
*
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
*
* An exception is thrown if the file does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be read.
*
* @param file the file to open for input, must not be null
* @return a new {@link FileInputStream} for the specified file
* @throws FileNotFoundException if the file does not exist
* @throws IOException if the file object is a directory
* @throws IOException if the file cannot be read
* @since 1.3
*/
public static FileInputStream openInputStream(File file) throws IOException {
if (file.exists()) {
if (file.isDirectory()) {
throw new IOException("File '" + file + "' exists but is a directory");
}
if (file.canRead() == false) {
throw new IOException("File '" + file + "' cannot be read");
}
} else {
throw new FileNotFoundException("File '" + file + "' does not exist");
}
return new FileInputStream(file);
}
//-----------------------------------------------------------------------
/**
* Opens a {@link FileOutputStream} for the specified file, checking and
* creating the parent directory if it does not exist.
*
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
*
* The parent directory will be created if it does not exist.
* The file will be created if it does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be written to.
* An exception is thrown if the parent directory cannot be created.
*
* @param file the file to open for output, must not be null
* @return a new {@link FileOutputStream} for the specified file
* @throws IOException if the file object is a directory
* @throws IOException if the file cannot be written to
* @throws IOException if a parent directory needs creating but that fails
* @since 1.3
*/
public static FileOutputStream openOutputStream(File file) throws IOException {
return openOutputStream(file, false);
}
/**
* Opens a {@link FileOutputStream} for the specified file, checking and
* creating the parent directory if it does not exist.
*
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
*
* The parent directory will be created if it does not exist.
* The file will be created if it does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be written to.
* An exception is thrown if the parent directory cannot be created.
*
* @param file the file to open for output, must not be null
* @param append if true, then bytes will be added to the
* end of the file rather than overwriting
* @return a new {@link FileOutputStream} for the specified file
* @throws IOException if the file object is a directory
* @throws IOException if the file cannot be written to
* @throws IOException if a parent directory needs creating but that fails
* @since 2.1
*/
public static FileOutputStream openOutputStream(File file, boolean append) throws IOException {
if (file.exists()) {
if (file.isDirectory()) {
throw new IOException("File '" + file + "' exists but is a directory");
}
if (file.canWrite() == false) {
throw new IOException("File '" + file + "' cannot be written to");
}
} else {
File parent = file.getParentFile();
if (parent != null) {
if (!parent.mkdirs() && !parent.isDirectory()) {
throw new IOException("Directory '" + parent + "' could not be created");
}
}
}
return new FileOutputStream(file, append);
}
//-----------------------------------------------------------------------
/**
* Returns a human-readable version of the file size, where the input
* represents a specific number of bytes.
*
* If the size is over 1GB, the size is returned as the number of whole GB,
* i.e. the size is rounded down to the nearest GB boundary.
*
* Similarly for the 1MB and 1KB boundaries.
*
* @param size the number of bytes
* @return a human-readable display value (includes units - GB, MB, KB or bytes)
*/
// See https://issues.apache.org/jira/browse/IO-226 - should the rounding be changed?
public static String byteCountToDisplaySize(long size) {
String displaySize;
if (size / ONE_EB > 0) {
displaySize = String.valueOf(size / ONE_EB) + " EB";
} else if (size / ONE_PB > 0) {
displaySize = String.valueOf(size / ONE_PB) + " PB";
} else if (size / ONE_TB > 0) {
displaySize = String.valueOf(size / ONE_TB) + " TB";
} else if (size / ONE_GB > 0) {
displaySize = String.valueOf(size / ONE_GB) + " GB";
} else if (size / ONE_MB > 0) {
displaySize = String.valueOf(size / ONE_MB) + " MB";
} else if (size / ONE_KB > 0) {
displaySize = String.valueOf(size / ONE_KB) + " KB";
} else {
displaySize = String.valueOf(size) + " bytes";
}
return displaySize;
}
//-----------------------------------------------------------------------
/**
* 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.
*
* NOTE: As from v1.3, this method throws an IOException if the last
* modified date of the file cannot be set. Also, as from v1.3 this method
* creates parent directories if they do not exist.
*
* @param file the File to touch
* @throws IOException If an I/O problem occurs
*/
public static void touch(File file) throws IOException {
if (!file.exists()) {
OutputStream out = openOutputStream(file);
IOUtils.closeQuietly(out);
}
boolean success = file.setLastModified(System.currentTimeMillis());
if (!success) {
throw new IOException("Unable to set the last modification time for " + file);
}
}
//-----------------------------------------------------------------------
/**
* Converts a Collection containing java.io.File instanced into array
* representation. This is to account for the difference between
* File.listFiles() and FileUtils.listFiles().
*
* @param files a Collection containing java.io.File instances
* @return an array of java.io.File
*/
public static File[] convertFileCollectionToFileArray(Collection files) {
return files.toArray(new File[files.size()]);
}
//-----------------------------------------------------------------------
/**
* Finds files within a given directory (and optionally its
* subdirectories). All files found are filtered by an IOFileFilter.
*
* @param files the collection of files found.
* @param directory the directory to search in.
* @param filter the filter to apply to files and directories.
* @param includeSubDirectories indicates if will include the subdirectories themselves
*/
private static void innerListFiles(Collection files, File directory,
IOFileFilter filter, boolean includeSubDirectories) {
File[] found = directory.listFiles((FileFilter) filter);
if (found != null) {
for (File file : found) {
if (file.isDirectory()) {
if (includeSubDirectories) {
files.add(file);
}
innerListFiles(files, file, filter, includeSubDirectories);
} else {
files.add(file);
}
}
}
}
/**
* Finds files within a given directory (and optionally its
* subdirectories). All files found are filtered by an IOFileFilter.
*
* If your search should recurse into subdirectories you can pass in
* an IOFileFilter for directories. You don't need to bind a
* DirectoryFileFilter (via logical AND) to this filter. This method does
* that for you.
*
* An example: If you want to search through all directories called
* "temp" you pass in FileFilterUtils.NameFileFilter("temp")
*
* Another common usage of this method is find files in a directory
* tree but ignoring the directories generated CVS. You can simply pass
* in FileFilterUtils.makeCVSAware(null).
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is null, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return an collection of java.io.File with the matching files
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
*/
/*
public static Collection listFiles(
File directory, IOFileFilter fileFilter, IOFileFilter dirFilter) {
validateListFilesParameters(directory, fileFilter);
IOFileFilter effFileFilter = setUpEffectiveFileFilter(fileFilter);
IOFileFilter effDirFilter = setUpEffectiveDirFilter(dirFilter);
//Find files
Collection files = new java.util.LinkedList();
innerListFiles(files, directory,
FileFilterUtils.or(effFileFilter, effDirFilter), false);
return files;
}
*/
/**
* Validates the given arguments.
*
* - Throws {@link IllegalArgumentException} if {@code directory} is not a directory
* - Throws {@link NullPointerException} if {@code fileFilter} is null
*
*
* @param directory The File to test
* @param fileFilter The IOFileFilter to test
*/
private static void validateListFilesParameters(File directory, IOFileFilter fileFilter) {
if (!directory.isDirectory()) {
throw new IllegalArgumentException("Parameter 'directory' is not a directory");
}
if (fileFilter == null) {
throw new NullPointerException("Parameter 'fileFilter' is null");
}
}
/**
* Returns a filter that accepts files in addition to the {@link File} objects accepted by the given filter.
*
* @param fileFilter a base filter to add to
* @return a filter that accepts files
*/
/*
private static IOFileFilter setUpEffectiveFileFilter(IOFileFilter fileFilter) {
return FileFilterUtils.and(fileFilter, FileFilterUtils.notFileFilter(DirectoryFileFilter.INSTANCE));
}
*/
/**
* Returns a filter that accepts directories in addition to the {@link File} objects accepted by the given filter.
*
* @param dirFilter a base filter to add to
* @return a filter that accepts directories
*/
/*
private static IOFileFilter setUpEffectiveDirFilter(IOFileFilter dirFilter) {
return dirFilter == null ? FalseFileFilter.INSTANCE : FileFilterUtils.and(dirFilter,
DirectoryFileFilter.INSTANCE);
}
*/
/**
* Finds files within a given directory (and optionally its
* subdirectories). All files found are filtered by an IOFileFilter.
*
* The resulting collection includes the subdirectories themselves.
*
* @see org.apache.commons.io.FileUtils#listFiles
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is null, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return an collection of java.io.File with the matching files
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
* @since 2.2
*/
/*
public static Collection listFilesAndDirs(
File directory, IOFileFilter fileFilter, IOFileFilter dirFilter) {
validateListFilesParameters(directory, fileFilter);
IOFileFilter effFileFilter = setUpEffectiveFileFilter(fileFilter);
IOFileFilter effDirFilter = setUpEffectiveDirFilter(dirFilter);
//Find files
Collection files = new java.util.LinkedList();
if (directory.isDirectory()) {
files.add(directory);
}
innerListFiles(files, directory,
FileFilterUtils.or(effFileFilter, effDirFilter), true);
return files;
}
*/
/**
* Allows iteration over the files in given directory (and optionally
* its subdirectories).
*
* All files found are filtered by an IOFileFilter. This method is
* based on {@link #listFiles(File, IOFileFilter, IOFileFilter)},
* which supports Iterable ('foreach' loop).
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is null, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return an iterator of java.io.File for the matching files
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
* @since 1.2
*/
/*
public static Iterator iterateFiles(
File directory, IOFileFilter fileFilter, IOFileFilter dirFilter) {
return listFiles(directory, fileFilter, dirFilter).iterator();
}
*/
/**
* Allows iteration over the files in given directory (and optionally
* its subdirectories).
*
* All files found are filtered by an IOFileFilter. This method is
* based on {@link #listFilesAndDirs(File, IOFileFilter, IOFileFilter)},
* which supports Iterable ('foreach' loop).
*
* The resulting iterator includes the subdirectories themselves.
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is null, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return an iterator of java.io.File for the matching files
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
* @since 2.2
*/
/*
public static Iterator iterateFilesAndDirs(File directory, IOFileFilter fileFilter, IOFileFilter dirFilter) {
return listFilesAndDirs(directory, fileFilter, dirFilter).iterator();
}
*/
//-----------------------------------------------------------------------
/**
* Converts an array of file extensions to suffixes for use
* with IOFileFilters.
*
* @param extensions an array of extensions. Format: {"java", "xml"}
* @return an array of suffixes. Format: {".java", ".xml"}
*/
private static String[] toSuffixes(String[] extensions) {
String[] suffixes = new String[extensions.length];
for (int i = 0; i < extensions.length; i++) {
suffixes[i] = "." + extensions[i];
}
return suffixes;
}
/**
* Finds files within a given directory (and optionally its subdirectories)
* which match an array of extensions.
*
* @param directory the directory to search in
* @param extensions an array of extensions, ex. {"java","xml"}. If this
* parameter is null, all files are returned.
* @param recursive if true all subdirectories are searched as well
* @return an collection of java.io.File with the matching files
*/
/*
public static Collection listFiles(
File directory, String[] extensions, boolean recursive) {
IOFileFilter filter;
if (extensions == null) {
filter = TrueFileFilter.INSTANCE;
} else {
String[] suffixes = toSuffixes(extensions);
filter = new SuffixFileFilter(suffixes);
}
return listFiles(directory, filter,
recursive ? TrueFileFilter.INSTANCE : FalseFileFilter.INSTANCE);
}
*/
/**
* Allows iteration over the files in a given directory (and optionally
* its subdirectories) which match an array of extensions. This method
* is based on {@link #listFiles(File, String[], boolean)},
* which supports Iterable ('foreach' loop).
*
* @param directory the directory to search in
* @param extensions an array of extensions, ex. {"java","xml"}. If this
* parameter is null, all files are returned.
* @param recursive if true all subdirectories are searched as well
* @return an iterator of java.io.File with the matching files
* @since 1.2
*/
/*
public static Iterator iterateFiles(
File directory, String[] extensions, boolean recursive) {
return listFiles(directory, extensions, recursive).iterator();
}
*/
//-----------------------------------------------------------------------
/**
* Compares 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
*
* @param file1 the first file
* @param file2 the second file
* @return true if the content of the files are equal or they both don't
* exist, false otherwise
* @throws IOException in case of an I/O error
*/
public static boolean contentEquals(File file1, File file2) throws IOException {
boolean file1Exists = file1.exists();
if (file1Exists != file2.exists()) {
return false;
}
if (!file1Exists) {
// two not existing files are equal
return true;
}
if (file1.isDirectory() || file2.isDirectory()) {
// don't want to compare directory contents
throw new IOException("Can't compare directories, only files");
}
if (file1.length() != file2.length()) {
// lengths differ, cannot be equal
return false;
}
if (file1.getCanonicalFile().equals(file2.getCanonicalFile())) {
// same file
return true;
}
InputStream input1 = null;
InputStream input2 = null;
try {
input1 = new FileInputStream(file1);
input2 = new FileInputStream(file2);
return IOUtils.contentEquals(input1, input2);
} finally {
IOUtils.closeQuietly(input1);
IOUtils.closeQuietly(input2);
}
}
//-----------------------------------------------------------------------
/**
* Compares the contents of two files to determine if they are equal or not.
*
* This method checks to see if the two files point to the same file,
* before resorting to line-by-line comparison of the contents.
*
*
* @param file1 the first file
* @param file2 the second file
* @param charsetName the character encoding to be used.
* May be null, in which case the platform default is used
* @return true if the content of the files are equal or neither exists,
* false otherwise
* @throws IOException in case of an I/O error
* @since 2.2
* @see IOUtils#contentEqualsIgnoreEOL(Reader, Reader)
*/
public static boolean contentEqualsIgnoreEOL(File file1, File file2, String charsetName) throws IOException {
boolean file1Exists = file1.exists();
if (file1Exists != file2.exists()) {
return false;
}
if (!file1Exists) {
// two not existing files are equal
return true;
}
if (file1.isDirectory() || file2.isDirectory()) {
// don't want to compare directory contents
throw new IOException("Can't compare directories, only files");
}
if (file1.getCanonicalFile().equals(file2.getCanonicalFile())) {
// same file
return true;
}
Reader input1 = null;
Reader input2 = null;
try {
if (charsetName == null) {
input1 = new InputStreamReader(new FileInputStream(file1));
input2 = new InputStreamReader(new FileInputStream(file2));
} else {
input1 = new InputStreamReader(new FileInputStream(file1), charsetName);
input2 = new InputStreamReader(new FileInputStream(file2), charsetName);
}
return IOUtils.contentEqualsIgnoreEOL(input1, input2);
} finally {
IOUtils.closeQuietly(input1);
IOUtils.closeQuietly(input2);
}
}
//-----------------------------------------------------------------------
/**
* 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. Starting with version
* 1.5, this method uses UTF-8 to decode percent-encoded octets to characters.
* Additionally, malformed percent-encoded octets are handled leniently by
* passing them through literally.
*
* @param url the file URL to convert, null returns null
* @return the equivalent File object, or null
* if the URL's protocol is not file
*/
public static File toFile(URL url) {
if (url == null || !"file".equalsIgnoreCase(url.getProtocol())) {
return null;
} else {
String filename = url.getFile().replace('/', File.separatorChar);
filename = decodeUrl(filename);
return new File(filename);
}
}
/**
* Decodes the specified URL as per RFC 3986, i.e. transforms
* percent-encoded octets to characters by decoding with the UTF-8 character
* set. This function is primarily intended for usage with
* {@link java.net.URL} which unfortunately does not enforce proper URLs. As
* such, this method will leniently accept invalid characters or malformed
* percent-encoded octets and simply pass them literally through to the
* result string. Except for rare edge cases, this will make unencoded URLs
* pass through unaltered.
*
* @param url The URL to decode, may be null.
* @return The decoded URL or null if the input was
* null.
*/
static String decodeUrl(String url) {
String decoded = url;
if (url != null && url.indexOf('%') >= 0) {
int n = url.length();
StringBuffer buffer = new StringBuffer();
ByteBuffer bytes = ByteBuffer.allocate(n);
for (int i = 0; i < n;) {
if (url.charAt(i) == '%') {
try {
do {
byte octet = (byte) Integer.parseInt(url.substring(i + 1, i + 3), 16);
bytes.put(octet);
i += 3;
} while (i < n && url.charAt(i) == '%');
continue;
} catch (RuntimeException e) {
// malformed percent-encoded octet, fall through and
// append characters literally
} finally {
if (bytes.position() > 0) {
bytes.flip();
buffer.append(UTF8.decode(bytes).toString());
bytes.clear();
}
}
}
buffer.append(url.charAt(i++));
}
decoded = buffer.toString();
}
return decoded;
}
/**
* 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.
*
* @param urls the file URLs to convert, null returns empty array
* @return 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 IllegalArgumentException if any file is not a URL file
* @throws IllegalArgumentException if any file is incorrectly encoded
* @since 1.1
*/
public static File[] toFiles(URL[] urls) {
if (urls == null || urls.length == 0) {
return EMPTY_FILE_ARRAY;
}
File[] files = new File[urls.length];
for (int i = 0; i < urls.length; i++) {
URL url = urls[i];
if (url != null) {
if (url.getProtocol().equals("file") == false) {
throw new IllegalArgumentException(
"URL could not be converted to a File: " + url);
}
files[i] = toFile(url);
}
}
return files;
}
/**
* Converts each of an array of File to a URL.
*
* Returns an array of the same size as the input.
*
* @param files the files to convert
* @return an array of URLs matching the input
* @throws IOException if a file cannot be converted
*/
public static URL[] toURLs(File[] files) throws IOException {
URL[] urls = new URL[files.length];
for (int i = 0; i < urls.length; i++) {
urls[i] = files[i].toURI().toURL();
}
return urls;
}
//-----------------------------------------------------------------------
/**
* 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.
*
* Note: This method tries to preserve the file's last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
*
* @param srcFile an existing file to copy, must not be null
* @param destDir the directory to place the copy in, must not be null
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @see #copyFile(File, File, boolean)
*/
public static void copyFileToDirectory(File srcFile, File destDir) throws IOException {
copyFileToDirectory(srcFile, destDir, true);
}
/**
* Copies a file to a directory optionally 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.
*
* Note: Setting preserveFileDate to
* true tries to preserve the file's last modified
* date/times using {@link File#setLastModified(long)}, however it is
* not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
*
* @param srcFile an existing file to copy, must not be null
* @param destDir the directory to place the copy in, must not be null
* @param preserveFileDate true if the file date of the copy
* should be the same as the original
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @see #copyFile(File, File, boolean)
* @since 1.3
*/
public static void copyFileToDirectory(File srcFile, File destDir, boolean preserveFileDate) throws IOException {
if (destDir == null) {
throw new NullPointerException("Destination must not be null");
}
if (destDir.exists() && destDir.isDirectory() == false) {
throw new IllegalArgumentException("Destination '" + destDir + "' is not a directory");
}
File destFile = new File(destDir, srcFile.getName());
copyFile(srcFile, destFile, preserveFileDate);
}
/**
* 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.
*
* Note: This method tries to preserve the file's last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
*
* @param srcFile an existing file to copy, must not be null
* @param destFile the new file, must not be null
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @see #copyFileToDirectory(File, File)
*/
public static void copyFile(File srcFile, File destFile) throws IOException {
copyFile(srcFile, destFile, true);
}
/**
* Copies a file to a new location.
*
* 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.
*
* Note: Setting preserveFileDate to
* true tries to preserve the file's last modified
* date/times using {@link File#setLastModified(long)}, however it is
* not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
*
* @param srcFile an existing file to copy, must not be null
* @param destFile the new file, must not be null
* @param preserveFileDate true if the file date of the copy
* should be the same as the original
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @see #copyFileToDirectory(File, File, boolean)
*/
public static void copyFile(File srcFile, File destFile,
boolean preserveFileDate) throws IOException {
if (srcFile == null) {
throw new NullPointerException("Source must not be null");
}
if (destFile == null) {
throw new NullPointerException("Destination must not be null");
}
if (srcFile.exists() == false) {
throw new FileNotFoundException("Source '" + srcFile + "' does not exist");
}
if (srcFile.isDirectory()) {
throw new IOException("Source '" + srcFile + "' exists but is a directory");
}
if (srcFile.getCanonicalPath().equals(destFile.getCanonicalPath())) {
throw new IOException("Source '" + srcFile + "' and destination '" + destFile + "' are the same");
}
File parentFile = destFile.getParentFile();
if (parentFile != null) {
if (!parentFile.mkdirs() && !parentFile.isDirectory()) {
throw new IOException("Destination '" + parentFile + "' directory cannot be created");
}
}
if (destFile.exists() && destFile.canWrite() == false) {
throw new IOException("Destination '" + destFile + "' exists but is read-only");
}
doCopyFile(srcFile, destFile, preserveFileDate);
}
/**
* Copy bytes from a File to an OutputStream.
*
* This method buffers the input internally, so there is no need to use a BufferedInputStream.
*
*
* @param input
* the File to read from
* @param output
* the OutputStream to write to
* @return the number of bytes copied
* @throws NullPointerException
* if the input or output is null
* @throws IOException
* if an I/O error occurs
* @since 2.1
*/
public static long copyFile(File input, OutputStream output) throws IOException {
final FileInputStream fis = new FileInputStream(input);
try {
return IOUtils.copyLarge(fis, output);
} finally {
fis.close();
}
}
/**
* Internal copy file method.
*
* @param srcFile the validated source file, must not be null
* @param destFile the validated destination file, must not be null
* @param preserveFileDate whether to preserve the file date
* @throws IOException if an error occurs
*/
private static void doCopyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException {
if (destFile.exists() && destFile.isDirectory()) {
throw new IOException("Destination '" + destFile + "' exists but is a directory");
}
FileInputStream fis = null;
FileOutputStream fos = null;
FileChannel input = null;
FileChannel output = null;
try {
fis = new FileInputStream(srcFile);
fos = new FileOutputStream(destFile);
input = fis.getChannel();
output = fos.getChannel();
long size = input.size();
long pos = 0;
long count = 0;
while (pos < size) {
count = size - pos > FILE_COPY_BUFFER_SIZE ? FILE_COPY_BUFFER_SIZE : size - pos;
pos += output.transferFrom(input, pos, count);
}
} finally {
IOUtils.closeQuietly(output);
IOUtils.closeQuietly(fos);
IOUtils.closeQuietly(input);
IOUtils.closeQuietly(fis);
}
if (srcFile.length() != destFile.length()) {
throw new IOException("Failed to copy full contents from '" +
srcFile + "' to '" + destFile + "'");
}
if (preserveFileDate) {
destFile.setLastModified(srcFile.lastModified());
}
}
//-----------------------------------------------------------------------
/**
* 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.
*
* Note: This method tries to preserve the files' last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
*
* @param srcDir an existing directory to copy, must not be null
* @param destDir the directory to place the copy in, must not be null
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @since 1.2
*/
public static void copyDirectoryToDirectory(File srcDir, File destDir) throws IOException {
if (srcDir == null) {
throw new NullPointerException("Source must not be null");
}
if (srcDir.exists() && srcDir.isDirectory() == false) {
throw new IllegalArgumentException("Source '" + destDir + "' is not a directory");
}
if (destDir == null) {
throw new NullPointerException("Destination must not be null");
}
if (destDir.exists() && destDir.isDirectory() == false) {
throw new IllegalArgumentException("Destination '" + destDir + "' is not a directory");
}
copyDirectory(srcDir, new File(destDir, srcDir.getName()), true);
}
/**
* 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.
*
* Note: This method tries to preserve the files' last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
*
* @param srcDir an existing directory to copy, must not be null
* @param destDir the new directory, must not be null
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @since 1.1
*/
public static void copyDirectory(File srcDir, File destDir) throws IOException {
copyDirectory(srcDir, destDir, true);
}
/**
* 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.
*
* Note: Setting preserveFileDate to
* true tries to preserve the files' last modified
* date/times using {@link File#setLastModified(long)}, however it is
* not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
*
* @param srcDir an existing directory to copy, must not be null
* @param destDir the new directory, must not be null
* @param preserveFileDate true if the file date of the copy
* should be the same as the original
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @since 1.1
*/
public static void copyDirectory(File srcDir, File destDir,
boolean preserveFileDate) throws IOException {
copyDirectory(srcDir, destDir, null, preserveFileDate);
}
/**
* Copies a filtered directory to a new location preserving the file dates.
*
* 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.
*
* Note: This method tries to preserve the files' last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
*
*
Example: Copy directories only
*
* // only copy the directory structure
* FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY);
*
*
* Example: Copy directories and txt files
*
* // Create a filter for ".txt" files
* IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
* IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
*
* // Create a filter for either directories or ".txt" files
* FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
*
* // Copy using the filter
* FileUtils.copyDirectory(srcDir, destDir, filter);
*
*
* @param srcDir an existing directory to copy, must not be null
* @param destDir the new directory, must not be null
* @param filter the filter to apply, null means copy all directories and files
* should be the same as the original
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @since 1.4
*/
public static void copyDirectory(File srcDir, File destDir,
FileFilter filter) throws IOException {
copyDirectory(srcDir, destDir, filter, true);
}
/**
* Copies a filtered 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.
*
* Note: Setting preserveFileDate to
* true tries to preserve the files' last modified
* date/times using {@link File#setLastModified(long)}, however it is
* not guaranteed that those operations will succeed.
* If the modification operation fails, no indication is provided.
*
*
Example: Copy directories only
*
* // only copy the directory structure
* FileUtils.copyDirectory(srcDir, destDir, DirectoryFileFilter.DIRECTORY, false);
*
*
* Example: Copy directories and txt files
*
* // Create a filter for ".txt" files
* IOFileFilter txtSuffixFilter = FileFilterUtils.suffixFileFilter(".txt");
* IOFileFilter txtFiles = FileFilterUtils.andFileFilter(FileFileFilter.FILE, txtSuffixFilter);
*
* // Create a filter for either directories or ".txt" files
* FileFilter filter = FileFilterUtils.orFileFilter(DirectoryFileFilter.DIRECTORY, txtFiles);
*
* // Copy using the filter
* FileUtils.copyDirectory(srcDir, destDir, filter, false);
*
*
* @param srcDir an existing directory to copy, must not be null
* @param destDir the new directory, must not be null
* @param filter the filter to apply, null means copy all directories and files
* @param preserveFileDate true if the file date of the copy
* should be the same as the original
*
* @throws NullPointerException if source or destination is null
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @since 1.4
*/
public static void copyDirectory(File srcDir, File destDir,
FileFilter filter, boolean preserveFileDate) throws IOException {
if (srcDir == null) {
throw new NullPointerException("Source must not be null");
}
if (destDir == null) {
throw new NullPointerException("Destination must not be null");
}
if (srcDir.exists() == false) {
throw new FileNotFoundException("Source '" + srcDir + "' does not exist");
}
if (srcDir.isDirectory() == false) {
throw new IOException("Source '" + srcDir + "' exists but is not a directory");
}
if (srcDir.getCanonicalPath().equals(destDir.getCanonicalPath())) {
throw new IOException("Source '" + srcDir + "' and destination '" + destDir + "' are the same");
}
// Cater for destination being directory within the source directory (see IO-141)
List exclusionList = null;
if (destDir.getCanonicalPath().startsWith(srcDir.getCanonicalPath())) {
File[] srcFiles = filter == null ? srcDir.listFiles() : srcDir.listFiles(filter);
if (srcFiles != null && srcFiles.length > 0) {
exclusionList = new ArrayList(srcFiles.length);
for (File srcFile : srcFiles) {
File copiedFile = new File(destDir, srcFile.getName());
exclusionList.add(copiedFile.getCanonicalPath());
}
}
}
doCopyDirectory(srcDir, destDir, filter, preserveFileDate, exclusionList);
}
/**
* Internal copy directory method.
*
* @param srcDir the validated source directory, must not be null
* @param destDir the validated destination directory, must not be null
* @param filter the filter to apply, null means copy all directories and files
* @param preserveFileDate whether to preserve the file date
* @param exclusionList List of files and directories to exclude from the copy, may be null
* @throws IOException if an error occurs
* @since 1.1
*/
private static void doCopyDirectory(File srcDir, File destDir, FileFilter filter,
boolean preserveFileDate, List exclusionList) throws IOException {
// recurse
File[] srcFiles = filter == null ? srcDir.listFiles() : srcDir.listFiles(filter);
if (srcFiles == null) { // null if abstract pathname does not denote a directory, or if an I/O error occurs
throw new IOException("Failed to list contents of " + srcDir);
}
if (destDir.exists()) {
if (destDir.isDirectory() == false) {
throw new IOException("Destination '" + destDir + "' exists but is not a directory");
}
} else {
if (!destDir.mkdirs() && !destDir.isDirectory()) {
throw new IOException("Destination '" + destDir + "' directory cannot be created");
}
}
if (destDir.canWrite() == false) {
throw new IOException("Destination '" + destDir + "' cannot be written to");
}
for (File srcFile : srcFiles) {
File dstFile = new File(destDir, srcFile.getName());
if (exclusionList == null || !exclusionList.contains(srcFile.getCanonicalPath())) {
if (srcFile.isDirectory()) {
doCopyDirectory(srcFile, dstFile, filter, preserveFileDate, exclusionList);
} else {
doCopyFile(srcFile, dstFile, preserveFileDate);
}
}
}
// Do this last, as the above has probably affected directory metadata
if (preserveFileDate) {
destDir.setLastModified(srcDir.lastModified());
}
}
//-----------------------------------------------------------------------
/**
* 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.
*
* Warning: this method does not set a connection or read timeout and thus
* might block forever. Use {@link #copyURLToFile(URL, File, int, int)}
* with reasonable timeouts to prevent this.
*
* @param source the URL to copy bytes from, must not be null
* @param destination the non-directory File to write bytes to
* (possibly overwriting), must not be null
* @throws IOException if source URL cannot be opened
* @throws IOException if destination is a directory
* @throws IOException if destination cannot be written
* @throws IOException if destination needs creating but can't be
* @throws IOException if an IO error occurs during copying
*/
public static void copyURLToFile(URL source, File destination) throws IOException {
InputStream input = source.openStream();
copyInputStreamToFile(input, destination);
}
/**
* 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.
*
* @param source the URL to copy bytes from, must not be null
* @param destination the non-directory File to write bytes to
* (possibly overwriting), must not be null
* @param connectionTimeout the number of milliseconds until this method
* will timeout if no connection could be established to the source
* @param readTimeout the number of milliseconds until this method will
* timeout if no data could be read from the source
* @throws IOException if source URL cannot be opened
* @throws IOException if destination is a directory
* @throws IOException if destination cannot be written
* @throws IOException if destination needs creating but can't be
* @throws IOException if an IO error occurs during copying
* @since 2.0
*/
public static void copyURLToFile(URL source, File destination,
int connectionTimeout, int readTimeout) throws IOException {
URLConnection connection = source.openConnection();
connection.setConnectTimeout(connectionTimeout);
connection.setReadTimeout(readTimeout);
InputStream input = connection.getInputStream();
copyInputStreamToFile(input, destination);
}
/**
* Copies bytes from an {@link InputStream} 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.
*
* @param source the InputStream to copy bytes from, must not be null
* @param destination the non-directory File to write bytes to
* (possibly overwriting), must not be null
* @throws IOException if destination is a directory
* @throws IOException if destination cannot be written
* @throws IOException if destination needs creating but can't be
* @throws IOException if an IO error occurs during copying
* @since 2.0
*/
public static void copyInputStreamToFile(InputStream source, File destination) throws IOException {
try {
FileOutputStream output = openOutputStream(destination);
try {
IOUtils.copy(source, output);
output.close(); // don't swallow close Exception if copy completes normally
} finally {
IOUtils.closeQuietly(output);
}
} finally {
IOUtils.closeQuietly(source);
}
}
//-----------------------------------------------------------------------
/**
* Deletes a directory recursively.
*
* @param directory directory to delete
* @throws IOException in case deletion is unsuccessful
*/
public static void deleteDirectory(File directory) throws IOException {
if (!directory.exists()) {
return;
}
if (!isSymlink(directory)) {
cleanDirectory(directory);
}
if (!directory.delete()) {
String message =
"Unable to delete directory " + directory + ".";
throw new IOException(message);
}
}
/**
* Deletes a file, never throwing an exception. 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.
* - No exceptions are thrown when a file or directory cannot be deleted.
*
*
* @param file file or directory to delete, can be null
* @return true if the file or directory was deleted, otherwise
* false
*
* @since 1.4
*/
public static boolean deleteQuietly(File file) {
if (file == null) {
return false;
}
try {
if (file.isDirectory()) {
cleanDirectory(file);
}
} catch (Exception ignored) {
}
try {
return file.delete();
} catch (Exception ignored) {
return false;
}
}
/**
* Determines whether the {@code parent} directory contains the {@code child} element (a file or directory).
*
* Files are normalized before comparison.
*
*
* Edge cases:
*
* - A {@code directory} must not be null: if null, throw IllegalArgumentException
* - A {@code directory} must be a directory: if not a directory, throw IllegalArgumentException
* - A directory does not contain itself: return false
* - A null child file is not contained in any parent: return false
*
*
* @param directory
* the file to consider as the parent.
* @param child
* the file to consider as the child.
* @return true is the candidate leaf is under by the specified composite. False otherwise.
* @throws IOException
* if an IO error occurs while checking the files.
* @since 2.2
* @see FilenameUtils#directoryContains(String, String)
*/
public static boolean directoryContains(final File directory, final File child) throws IOException {
// Fail fast against NullPointerException
if (directory == null) {
throw new IllegalArgumentException("Directory must not be null");
}
if (!directory.isDirectory()) {
throw new IllegalArgumentException("Not a directory: " + directory);
}
if (child == null) {
return false;
}
if (!directory.exists() || !child.exists()) {
return false;
}
// Canonicalize paths (normalizes relative paths)
String canonicalParent = directory.getCanonicalPath();
String canonicalChild = child.getCanonicalPath();
return FilenameUtils.directoryContains(canonicalParent, canonicalChild);
}
/**
* Cleans a directory without deleting it.
*
* @param directory directory to clean
* @throws IOException in case cleaning is unsuccessful
*/
public static void cleanDirectory(File directory) throws IOException {
if (!directory.exists()) {
String message = directory + " does not exist";
throw new IllegalArgumentException(message);
}
if (!directory.isDirectory()) {
String message = directory + " is not a directory";
throw new IllegalArgumentException(message);
}
File[] files = directory.listFiles();
if (files == null) { // null if security restricted
throw new IOException("Failed to list contents of " + directory);
}
IOException exception = null;
for (File file : files) {
try {
forceDelete(file);
} catch (IOException ioe) {
exception = ioe;
}
}
if (null != exception) {
throw exception;
}
}
//-----------------------------------------------------------------------
/**
* Waits for NFS to propagate a file creation, imposing a timeout.
*
* This method repeatedly tests {@link File#exists()} until it returns
* true up to the maximum time specified in seconds.
*
* @param file the file to check, must not be null
* @param seconds the maximum time in seconds to wait
* @return true if file exists
* @throws NullPointerException if the file is null
*/
public static boolean waitFor(File file, int seconds) {
int timeout = 0;
int tick = 0;
while (!file.exists()) {
if (tick++ >= 10) {
tick = 0;
if (timeout++ > seconds) {
return false;
}
}
try {
Thread.sleep(100);
} catch (InterruptedException ignore) {
// ignore exception
} catch (Exception ex) {
break;
}
}
return true;
}
//-----------------------------------------------------------------------
/**
* Reads the contents of a file into a String.
* The file is always closed.
*
* @param file the file to read, must not be null
* @param encoding the encoding to use, null means platform default
* @return the file contents, never null
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
*/
public static String readFileToString(File file, String encoding) throws IOException {
InputStream in = null;
try {
in = openInputStream(file);
return IOUtils.toString(in, encoding);
} finally {
IOUtils.closeQuietly(in);
}
}
/**
* Reads the contents of a file into a String using the default encoding for the VM.
* The file is always closed.
*
* @param file the file to read, must not be null
* @return the file contents, never null
* @throws IOException in case of an I/O error
* @since 1.3.1
*/
public static String readFileToString(File file) throws IOException {
return readFileToString(file, null);
}
/**
* Reads the contents of a file into a byte array.
* The file is always closed.
*
* @param file the file to read, must not be null
* @return the file contents, never null
* @throws IOException in case of an I/O error
* @since 1.1
*/
public static byte[] readFileToByteArray(File file) throws IOException {
InputStream in = null;
try {
in = openInputStream(file);
return IOUtils.toByteArray(in, file.length());
} finally {
IOUtils.closeQuietly(in);
}
}
/**
* Reads the contents of a file line by line to a List of Strings.
* The file is always closed.
*
* @param file the file to read, must not be null
* @param encoding the encoding to use, null means platform default
* @return the list of Strings representing each line in the file, never null
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 1.1
*/
public static List readLines(File file, String encoding) throws IOException {
InputStream in = null;
try {
in = openInputStream(file);
return IOUtils.readLines(in, encoding);
} finally {
IOUtils.closeQuietly(in);
}
}
/**
* Reads the contents of a file line by line to a List of Strings using the default encoding for the VM.
* The file is always closed.
*
* @param file the file to read, must not be null
* @return the list of Strings representing each line in the file, never null
* @throws IOException in case of an I/O error
* @since 1.3
*/
public static List readLines(File file) throws IOException {
return readLines(file, null);
}
/**
* Returns an Iterator for the lines in a File.
*
* This method opens an InputStream for the file.
* When you have finished with the iterator you should close the stream
* to free internal resources. This can be done by calling the
* {@link LineIterator#close()} or
* {@link LineIterator#closeQuietly(LineIterator)} method.
*
* The recommended usage pattern is:
*
* LineIterator it = FileUtils.lineIterator(file, "UTF-8");
* try {
* while (it.hasNext()) {
* String line = it.nextLine();
* /// do something with line
* }
* } finally {
* LineIterator.closeQuietly(iterator);
* }
*
*
* If an exception occurs during the creation of the iterator, the
* underlying stream is closed.
*
* @param file the file to open for input, must not be null
* @param encoding the encoding to use, null means platform default
* @return an Iterator of the lines in the file, never null
* @throws IOException in case of an I/O error (file closed)
* @since 1.2
*/
public static LineIterator lineIterator(File file, String encoding) throws IOException {
InputStream in = null;
try {
in = openInputStream(file);
return IOUtils.lineIterator(in, encoding);
} catch (IOException ex) {
IOUtils.closeQuietly(in);
throw ex;
} catch (RuntimeException ex) {
IOUtils.closeQuietly(in);
throw ex;
}
}
/**
* Returns an Iterator for the lines in a File using the default encoding for the VM.
*
* @param file the file to open for input, must not be null
* @return an Iterator of the lines in the file, never null
* @throws IOException in case of an I/O error (file closed)
* @since 1.3
* @see #lineIterator(File, String)
*/
public static LineIterator lineIterator(File file) throws IOException {
return lineIterator(file, null);
}
//-----------------------------------------------------------------------
/**
* Writes a String to a file creating the file if it does not exist.
*
* NOTE: As from v1.3, the parent directories of the file will be created
* if they do not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, null means platform default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
*/
public static void writeStringToFile(File file, String data, String encoding) throws IOException {
writeStringToFile(file, data, encoding, false);
}
/**
* Writes a String to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, null means platform default
* @param append if true, then the String will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.1
*/
public static void writeStringToFile(File file, String data, String encoding, boolean append) throws IOException {
OutputStream out = null;
try {
out = openOutputStream(file, append);
IOUtils.write(data, out, encoding);
out.close(); // don't swallow close Exception if copy completes normally
} finally {
IOUtils.closeQuietly(out);
}
}
/**
* Writes a String to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @throws IOException in case of an I/O error
*/
public static void writeStringToFile(File file, String data) throws IOException {
writeStringToFile(file, data, null, false);
}
/**
* Writes a String to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @param append if true, then the String will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
*/
public static void writeStringToFile(File file, String data, boolean append) throws IOException {
writeStringToFile(file, data, null, append);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @throws IOException in case of an I/O error
* @since 2.0
*/
public static void write(File file, CharSequence data) throws IOException {
write(file, data, null, false);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist using the default encoding for the VM.
*
* @param file the file to write
* @param data the content to write to the file
* @param append if true, then the data will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
*/
public static void write(File file, CharSequence data, boolean append) throws IOException {
write(file, data, null, append);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, null means platform default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.0
*/
public static void write(File file, CharSequence data, String encoding) throws IOException {
write(file, data, encoding, false);
}
/**
* Writes a CharSequence to a file creating the file if it does not exist.
*
* @param file the file to write
* @param data the content to write to the file
* @param encoding the encoding to use, null means platform default
* @param append if true, then the data will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since IO 2.1
*/
public static void write(File file, CharSequence data, String encoding, boolean append) throws IOException {
String str = data == null ? null : data.toString();
writeStringToFile(file, str, encoding, append);
}
/**
* Writes a byte array to a file creating the file if it does not exist.
*
* NOTE: As from v1.3, the parent directories of the file will be created
* if they do not exist.
*
* @param file the file to write to
* @param data the content to write to the file
* @throws IOException in case of an I/O error
* @since 1.1
*/
public static void writeByteArrayToFile(File file, byte[] data) throws IOException {
writeByteArrayToFile(file, data, false);
}
/**
* Writes a byte array to a file creating the file if it does not exist.
*
* @param file the file to write to
* @param data the content to write to the file
* @param append if true, then bytes will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since IO 2.1
*/
public static void writeByteArrayToFile(File file, byte[] data, boolean append) throws IOException {
OutputStream out = null;
try {
out = openOutputStream(file, append);
out.write(data);
out.close(); // don't swallow close Exception if copy completes normally
} finally {
IOUtils.closeQuietly(out);
}
}
/**
* 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.
*
* NOTE: As from v1.3, the parent directories of the file will be created
* if they do not exist.
*
* @param file the file to write to
* @param encoding the encoding to use, null means platform default
* @param lines the lines to write, null entries produce blank lines
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 1.1
*/
public static void writeLines(File file, String encoding, Collection lines) throws IOException {
writeLines(file, encoding, lines, null, false);
}
/**
* Writes the toString() value of each item in a collection to
* the specified File line by line, optionally appending.
* The specified character encoding and the default line ending will be used.
*
* @param file the file to write to
* @param encoding the encoding to use, null means platform default
* @param lines the lines to write, null entries produce blank lines
* @param append if true, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.1
*/
public static void writeLines(File file, String encoding, Collection lines, boolean append) throws IOException {
writeLines(file, encoding, lines, null, append);
}
/**
* Writes the toString() value of each item in a collection to
* the specified File line by line.
* The default VM encoding and the default line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, null entries produce blank lines
* @throws IOException in case of an I/O error
* @since 1.3
*/
public static void writeLines(File file, Collection lines) throws IOException {
writeLines(file, null, lines, null, false);
}
/**
* Writes the toString() value of each item in a collection to
* the specified File line by line.
* The default VM encoding and the default line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, null entries produce blank lines
* @param append if true, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
*/
public static void writeLines(File file, Collection lines, boolean append) throws IOException {
writeLines(file, null, lines, null, append);
}
/**
* 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.
*
* NOTE: As from v1.3, the parent directories of the file will be created
* if they do not exist.
*
* @param file the file to write to
* @param encoding the encoding to use, null means platform default
* @param lines the lines to write, null entries produce blank lines
* @param lineEnding the line separator to use, null is system default
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 1.1
*/
public static void writeLines(File file, String encoding, Collection lines, String lineEnding)
throws IOException {
writeLines(file, encoding, lines, lineEnding, false);
}
/**
* 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.
*
* @param file the file to write to
* @param encoding the encoding to use, null means platform default
* @param lines the lines to write, null entries produce blank lines
* @param lineEnding the line separator to use, null is system default
* @param append if true, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @throws java.io.UnsupportedEncodingException if the encoding is not supported by the VM
* @since 2.1
*/
public static void writeLines(File file, String encoding, Collection lines, String lineEnding, boolean append)
throws IOException {
OutputStream out = null;
try {
out = openOutputStream(file, append);
IOUtils.writeLines(lines, lineEnding, out, encoding);
out.close(); // don't swallow close Exception if copy completes normally
} finally {
IOUtils.closeQuietly(out);
}
}
/**
* Writes the toString() value of each item in a collection to
* the specified File line by line.
* The default VM encoding and the specified line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, null entries produce blank lines
* @param lineEnding the line separator to use, null is system default
* @throws IOException in case of an I/O error
* @since 1.3
*/
public static void writeLines(File file, Collection lines, String lineEnding) throws IOException {
writeLines(file, null, lines, lineEnding, false);
}
/**
* Writes the toString() value of each item in a collection to
* the specified File line by line.
* The default VM encoding and the specified line ending will be used.
*
* @param file the file to write to
* @param lines the lines to write, null entries produce blank lines
* @param lineEnding the line separator to use, null is system default
* @param append if true, then the lines will be added to the
* end of the file rather than overwriting
* @throws IOException in case of an I/O error
* @since 2.1
*/
public static void writeLines(File file, Collection lines, String lineEnding, boolean append)
throws IOException {
writeLines(file, null, lines, lineEnding, append);
}
//-----------------------------------------------------------------------
/**
* Deletes 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)
*
*
* @param file file or directory to delete, must not be null
* @throws NullPointerException if the directory is null
* @throws FileNotFoundException if the file was not found
* @throws IOException in case deletion is unsuccessful
*/
public static void forceDelete(File file) throws IOException {
if (file.isDirectory()) {
deleteDirectory(file);
} else {
boolean filePresent = file.exists();
if (!file.delete()) {
if (!filePresent){
throw new FileNotFoundException("File does not exist: " + file);
}
String message =
"Unable to delete file: " + file;
throw new IOException(message);
}
}
}
/**
* Schedules a file to be deleted when JVM exits.
* If file is directory delete it and all sub-directories.
*
* @param file file or directory to delete, must not be null
* @throws NullPointerException if the file is null
* @throws IOException in case deletion is unsuccessful
*/
public static void forceDeleteOnExit(File file) throws IOException {
if (file.isDirectory()) {
deleteDirectoryOnExit(file);
} else {
file.deleteOnExit();
}
}
/**
* Schedules a directory recursively for deletion on JVM exit.
*
* @param directory directory to delete, must not be null
* @throws NullPointerException if the directory is null
* @throws IOException in case deletion is unsuccessful
*/
private static void deleteDirectoryOnExit(File directory) throws IOException {
if (!directory.exists()) {
return;
}
directory.deleteOnExit();
if (!isSymlink(directory)) {
cleanDirectoryOnExit(directory);
}
}
/**
* Cleans a directory without deleting it.
*
* @param directory directory to clean, must not be null
* @throws NullPointerException if the directory is null
* @throws IOException in case cleaning is unsuccessful
*/
private static void cleanDirectoryOnExit(File directory) throws IOException {
if (!directory.exists()) {
String message = directory + " does not exist";
throw new IllegalArgumentException(message);
}
if (!directory.isDirectory()) {
String message = directory + " is not a directory";
throw new IllegalArgumentException(message);
}
File[] files = directory.listFiles();
if (files == null) { // null if security restricted
throw new IOException("Failed to list contents of " + directory);
}
IOException exception = null;
for (File file : files) {
try {
forceDeleteOnExit(file);
} catch (IOException ioe) {
exception = ioe;
}
}
if (null != exception) {
throw exception;
}
}
/**
* Makes a directory, including any necessary but nonexistent parent
* directories. If a file already exists with specified name but it is
* not a directory then an IOException is thrown.
* If the directory cannot be created (or does not already exist)
* then an IOException is thrown.
*
* @param directory directory to create, must not be null
* @throws NullPointerException if the directory is null
* @throws IOException if the directory cannot be created or the file already exists but is not a directory
*/
public static void forceMkdir(File directory) throws IOException {
if (directory.exists()) {
if (!directory.isDirectory()) {
String message =
"File "
+ directory
+ " exists and is "
+ "not a directory. Unable to create directory.";
throw new IOException(message);
}
} else {
if (!directory.mkdirs()) {
// Double-check that some other thread or process hasn't made
// the directory in the background
if (!directory.isDirectory())
{
String message =
"Unable to create directory " + directory;
throw new IOException(message);
}
}
}
}
//-----------------------------------------------------------------------
/**
* Returns the size of the specified file or directory. If the provided
* {@link File} is a regular file, then the file's length is returned.
* If the argument is a directory, then the size of the directory is
* calculated recursively. If a directory or subdirectory is security
* restricted, its size will not be included.
*
* @param file the regular file or directory to return the size
* of (must not be null).
*
* @return the length of the file, or recursive size of the directory,
* provided (in bytes).
*
* @throws NullPointerException if the file is null
* @throws IllegalArgumentException if the file does not exist.
*
* @since 2.0
*/
public static long sizeOf(File file) {
if (!file.exists()) {
String message = file + " does not exist";
throw new IllegalArgumentException(message);
}
if (file.isDirectory()) {
return sizeOfDirectory(file);
} else {
return file.length();
}
}
/**
* Counts the size of a directory recursively (sum of the length of all files).
*
* @param directory directory to inspect, must not be null
* @return size of directory in bytes, 0 if directory is security restricted
* @throws NullPointerException if the directory is null
*/
public static long sizeOfDirectory(File directory) {
if (!directory.exists()) {
String message = directory + " does not exist";
throw new IllegalArgumentException(message);
}
if (!directory.isDirectory()) {
String message = directory + " is not a directory";
throw new IllegalArgumentException(message);
}
long size = 0;
File[] files = directory.listFiles();
if (files == null) { // null if security restricted
return 0L;
}
for (File file : files) {
size += sizeOf(file);
}
return size;
}
//-----------------------------------------------------------------------
/**
* Tests if the specified File is newer than the reference
* File.
*
* @param file the File of which the modification date must
* be compared, must not be null
* @param reference the File of which the modification date
* is used, must not be null
* @return true if the File exists and has been modified more
* recently than the reference File
* @throws IllegalArgumentException if the file is null
* @throws IllegalArgumentException if the reference file is null or doesn't exist
*/
public static boolean isFileNewer(File file, File reference) {
if (reference == null) {
throw new IllegalArgumentException("No specified reference file");
}
if (!reference.exists()) {
throw new IllegalArgumentException("The reference file '"
+ reference + "' doesn't exist");
}
return isFileNewer(file, reference.lastModified());
}
/**
* Tests if the specified File is newer than the specified
* Date.
*
* @param file the File of which the modification date
* must be compared, must not be null
* @param date the date reference, must not be null
* @return true if the File exists and has been modified
* after the given Date.
* @throws IllegalArgumentException if the file is null
* @throws IllegalArgumentException if the date is null
*/
public static boolean isFileNewer(File file, Date date) {
if (date == null) {
throw new IllegalArgumentException("No specified date");
}
return isFileNewer(file, date.getTime());
}
/**
* Tests if the specified File is newer than the specified
* time reference.
*
* @param file the File of which the modification date must
* be compared, must not be null
* @param timeMillis the time reference measured in milliseconds since the
* epoch (00:00:00 GMT, January 1, 1970)
* @return true if the File exists and has been modified after
* the given time reference.
* @throws IllegalArgumentException if the file is null
*/
public static boolean isFileNewer(File file, long timeMillis) {
if (file == null) {
throw new IllegalArgumentException("No specified file");
}
if (!file.exists()) {
return false;
}
return file.lastModified() > timeMillis;
}
//-----------------------------------------------------------------------
/**
* Tests if the specified File is older than the reference
* File.
*
* @param file the File of which the modification date must
* be compared, must not be null
* @param reference the File of which the modification date
* is used, must not be null
* @return true if the File exists and has been modified before
* the reference File
* @throws IllegalArgumentException if the file is null
* @throws IllegalArgumentException if the reference file is null or doesn't exist
*/
public static boolean isFileOlder(File file, File reference) {
if (reference == null) {
throw new IllegalArgumentException("No specified reference file");
}
if (!reference.exists()) {
throw new IllegalArgumentException("The reference file '"
+ reference + "' doesn't exist");
}
return isFileOlder(file, reference.lastModified());
}
/**
* Tests if the specified File is older than the specified
* Date.
*
* @param file the File of which the modification date
* must be compared, must not be null
* @param date the date reference, must not be null
* @return true if the File exists and has been modified
* before the given Date.
* @throws IllegalArgumentException if the file is null
* @throws IllegalArgumentException if the date is null
*/
public static boolean isFileOlder(File file, Date date) {
if (date == null) {
throw new IllegalArgumentException("No specified date");
}
return isFileOlder(file, date.getTime());
}
/**
* Tests if the specified File is older than the specified
* time reference.
*
* @param file the File of which the modification date must
* be compared, must not be null
* @param timeMillis the time reference measured in milliseconds since the
* epoch (00:00:00 GMT, January 1, 1970)
* @return true if the File exists and has been modified before
* the given time reference.
* @throws IllegalArgumentException if the file is null
*/
public static boolean isFileOlder(File file, long timeMillis) {
if (file == null) {
throw new IllegalArgumentException("No specified file");
}
if (!file.exists()) {
return false;
}
return file.lastModified() < timeMillis;
}
//-----------------------------------------------------------------------
/**
* Computes the checksum of a file using the CRC32 checksum routine.
* The value of the checksum is returned.
*
* @param file the file to checksum, must not be null
* @return the checksum value
* @throws NullPointerException if the file or checksum is null
* @throws IllegalArgumentException if the file is a directory
* @throws IOException if an IO error occurs reading the file
* @since 1.3
*/
public static long checksumCRC32(File file) throws IOException {
CRC32 crc = new CRC32();
checksum(file, crc);
return crc.getValue();
}
/**
* Computes the checksum of a file using the specified checksum object.
* Multiple files may be checked using one Checksum instance
* if desired simply by reusing the same checksum object.
* For example:
*
* long csum = FileUtils.checksum(file, new CRC32()).getValue();
*
*
* @param file the file to checksum, must not be null
* @param checksum the checksum object to be used, must not be null
* @return the checksum specified, updated with the content of the file
* @throws NullPointerException if the file or checksum is null
* @throws IllegalArgumentException if the file is a directory
* @throws IOException if an IO error occurs reading the file
* @since 1.3
*/
public static Checksum checksum(File file, Checksum checksum) throws IOException {
if (file.isDirectory()) {
throw new IllegalArgumentException("Checksums can't be computed on directories");
}
InputStream in = null;
try {
in = new CheckedInputStream(new FileInputStream(file), checksum);
IOUtils.copy(in, new NullOutputStream());
} finally {
IOUtils.closeQuietly(in);
}
return checksum;
}
/**
* Moves a directory.
*
* When the destination directory is on another file system, do a "copy and delete".
*
* @param srcDir the directory to be moved
* @param destDir the destination directory
* @throws NullPointerException if source or destination is null
* @throws FileExistsException if the destination directory exists
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs moving the file
* @since 1.4
*/
public static void moveDirectory(File srcDir, File destDir) throws IOException {
if (srcDir == null) {
throw new NullPointerException("Source must not be null");
}
if (destDir == null) {
throw new NullPointerException("Destination must not be null");
}
if (!srcDir.exists()) {
throw new FileNotFoundException("Source '" + srcDir + "' does not exist");
}
if (!srcDir.isDirectory()) {
throw new IOException("Source '" + srcDir + "' is not a directory");
}
if (destDir.exists()) {
throw new FileExistsException("Destination '" + destDir + "' already exists");
}
boolean rename = srcDir.renameTo(destDir);
if (!rename) {
if (destDir.getCanonicalPath().startsWith(srcDir.getCanonicalPath())) {
throw new IOException("Cannot move directory: "+srcDir+" to a subdirectory of itself: "+destDir);
}
copyDirectory( srcDir, destDir );
deleteDirectory( srcDir );
if (srcDir.exists()) {
throw new IOException("Failed to delete original directory '" + srcDir +
"' after copy to '" + destDir + "'");
}
}
}
/**
* Moves a directory to another directory.
*
* @param src the file to be moved
* @param destDir the destination file
* @param createDestDir If true create the destination directory,
* otherwise if false throw an IOException
* @throws NullPointerException if source or destination is null
* @throws FileExistsException if the directory exists in the destination directory
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs moving the file
* @since 1.4
*/
public static void moveDirectoryToDirectory(File src, File destDir, boolean createDestDir) throws IOException {
if (src == null) {
throw new NullPointerException("Source must not be null");
}
if (destDir == null) {
throw new NullPointerException("Destination directory must not be null");
}
if (!destDir.exists() && createDestDir) {
destDir.mkdirs();
}
if (!destDir.exists()) {
throw new FileNotFoundException("Destination directory '" + destDir +
"' does not exist [createDestDir=" + createDestDir +"]");
}
if (!destDir.isDirectory()) {
throw new IOException("Destination '" + destDir + "' is not a directory");
}
moveDirectory(src, new File(destDir, src.getName()));
}
/**
* Moves a file.
*
* When the destination file is on another file system, do a "copy and delete".
*
* @param srcFile the file to be moved
* @param destFile the destination file
* @throws NullPointerException if source or destination is null
* @throws FileExistsException if the destination file exists
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs moving the file
* @since 1.4
*/
public static void moveFile(File srcFile, File destFile) throws IOException {
if (srcFile == null) {
throw new NullPointerException("Source must not be null");
}
if (destFile == null) {
throw new NullPointerException("Destination must not be null");
}
if (!srcFile.exists()) {
throw new FileNotFoundException("Source '" + srcFile + "' does not exist");
}
if (srcFile.isDirectory()) {
throw new IOException("Source '" + srcFile + "' is a directory");
}
if (destFile.exists()) {
throw new FileExistsException("Destination '" + destFile + "' already exists");
}
if (destFile.isDirectory()) {
throw new IOException("Destination '" + destFile + "' is a directory");
}
boolean rename = srcFile.renameTo(destFile);
if (!rename) {
copyFile( srcFile, destFile );
if (!srcFile.delete()) {
FileUtils.deleteQuietly(destFile);
throw new IOException("Failed to delete original file '" + srcFile +
"' after copy to '" + destFile + "'");
}
}
}
/**
* Moves a file to a directory.
*
* @param srcFile the file to be moved
* @param destDir the destination file
* @param createDestDir If true create the destination directory,
* otherwise if false throw an IOException
* @throws NullPointerException if source or destination is null
* @throws FileExistsException if the destination file exists
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs moving the file
* @since 1.4
*/
public static void moveFileToDirectory(File srcFile, File destDir, boolean createDestDir) throws IOException {
if (srcFile == null) {
throw new NullPointerException("Source must not be null");
}
if (destDir == null) {
throw new NullPointerException("Destination directory must not be null");
}
if (!destDir.exists() && createDestDir) {
destDir.mkdirs();
}
if (!destDir.exists()) {
throw new FileNotFoundException("Destination directory '" + destDir +
"' does not exist [createDestDir=" + createDestDir +"]");
}
if (!destDir.isDirectory()) {
throw new IOException("Destination '" + destDir + "' is not a directory");
}
moveFile(srcFile, new File(destDir, srcFile.getName()));
}
/**
* Moves a file or directory to the destination directory.
*
* When the destination is on another file system, do a "copy and delete".
*
* @param src the file or directory to be moved
* @param destDir the destination directory
* @param createDestDir If true create the destination directory,
* otherwise if false throw an IOException
* @throws NullPointerException if source or destination is null
* @throws FileExistsException if the directory or file exists in the destination directory
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs moving the file
* @since 1.4
*/
public static void moveToDirectory(File src, File destDir, boolean createDestDir) throws IOException {
if (src == null) {
throw new NullPointerException("Source must not be null");
}
if (destDir == null) {
throw new NullPointerException("Destination must not be null");
}
if (!src.exists()) {
throw new FileNotFoundException("Source '" + src + "' does not exist");
}
if (src.isDirectory()) {
moveDirectoryToDirectory(src, destDir, createDestDir);
} else {
moveFileToDirectory(src, destDir, createDestDir);
}
}
/**
* Determines whether the specified file is a Symbolic Link rather than an actual file.
*
* Will not return true if there is a Symbolic Link anywhere in the path,
* only if the specific file is.
*
* Note: the current implementation always returns {@code false} if the system
* is detected as Windows using {@link FilenameUtils#isSystemWindows()}
*
* @param file the file to check
* @return true if the file is a Symbolic Link
* @throws IOException if an IO error occurs while checking the file
* @since 2.0
*/
public static boolean isSymlink(File file) throws IOException {
if (file == null) {
throw new NullPointerException("File must not be null");
}
if (FilenameUtils.isSystemWindows()) {
return false;
}
File fileInCanonicalDir = null;
if (file.getParent() == null) {
fileInCanonicalDir = file;
} else {
File canonicalDir = file.getParentFile().getCanonicalFile();
fileInCanonicalDir = new File(canonicalDir, file.getName());
}
if (fileInCanonicalDir.getCanonicalFile().equals(fileInCanonicalDir.getAbsoluteFile())) {
return false;
} else {
return true;
}
}
}