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FileUtils.java
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FileUtils.java
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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.BufferedOutputStream;
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.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
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.DirectoryFileFilter;
import org.apache.commons.io.filefilter.FalseFileFilter;
import org.apache.commons.io.filefilter.FileFilterUtils;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.filefilter.SuffixFileFilter;
import org.apache.commons.io.filefilter.TrueFileFilter;
import org.apache.commons.io.output.NullOutputStream;
/**
* General file manipulation utilities.
* <p>
* Facilities are provided in the following areas:
* <ul>
* <li>writing to a file
* <li>reading from a file
* <li>make a directory including parent directories
* <li>copying files and directories
* <li>deleting files and directories
* <li>converting to and from a URL
* <li>listing files and directories by filter and extension
* <li>comparing file content
* <li>file last changed date
* <li>calculating a checksum
* </ul>
* <p>
* Note that a specific charset should be specified whenever possible.
* Relying on the platform default means that the code is Locale-dependent.
* Only use the default if the files are known to always use the platform default.
* <p>
* Origin of code: Excalibur, Alexandria, Commons-Utils
*
*/
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 kilobyte.
*
* @since 2.4
*/
public static final BigInteger ONE_KB_BI = BigInteger.valueOf(ONE_KB);
/**
* The number of bytes in a megabyte.
*/
public static final long ONE_MB = ONE_KB * ONE_KB;
/**
* The number of bytes in a megabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_MB_BI = ONE_KB_BI.multiply(ONE_KB_BI);
/**
* 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 gigabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_GB_BI = ONE_KB_BI.multiply(ONE_MB_BI);
/**
* The number of bytes in a terabyte.
*/
public static final long ONE_TB = ONE_KB * ONE_GB;
/**
* The number of bytes in a terabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_TB_BI = ONE_KB_BI.multiply(ONE_GB_BI);
/**
* The number of bytes in a petabyte.
*/
public static final long ONE_PB = ONE_KB * ONE_TB;
/**
* The number of bytes in a petabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_PB_BI = ONE_KB_BI.multiply(ONE_TB_BI);
/**
* The number of bytes in an exabyte.
*/
public static final long ONE_EB = ONE_KB * ONE_PB;
/**
* The number of bytes in an exabyte.
*
* @since 2.4
*/
public static final BigInteger ONE_EB_BI = ONE_KB_BI.multiply(ONE_PB_BI);
/**
* 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_KB_BI.multiply(ONE_ZB);
/**
* An empty array of type <code>File</code>.
*/
public static final File[] EMPTY_FILE_ARRAY = new File[0];
//-----------------------------------------------------------------------
/**
* 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(final File directory, final String... names) {
if (directory == null) {
throw new NullPointerException("directory must not be null");
}
if (names == null) {
throw new NullPointerException("names must not be null");
}
File file = directory;
for (final 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(final String... names) {
if (names == null) {
throw new NullPointerException("names must not be null");
}
File file = null;
for (final 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 <code>new FileInputStream(file)</code>.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* <p>
* 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 {@code 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(final 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.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* <p>
* 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 {@code 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(final 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.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* <p>
* 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 {@code null}
* @param append if {@code 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(final File file, final 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 {
final 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.
* <p>
* 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.
* </p>
* <p>
* Similarly for the 1MB and 1KB boundaries.
* </p>
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
* @see <a href="https://issues.apache.org/jira/browse/IO-226">IO-226 - should the rounding be changed?</a>
* @since 2.4
*/
// See https://issues.apache.org/jira/browse/IO-226 - should the rounding be changed?
public static String byteCountToDisplaySize(final BigInteger size) {
String displaySize;
if (size.divide(ONE_EB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_EB_BI)) + " EB";
} else if (size.divide(ONE_PB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_PB_BI)) + " PB";
} else if (size.divide(ONE_TB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_TB_BI)) + " TB";
} else if (size.divide(ONE_GB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_GB_BI)) + " GB";
} else if (size.divide(ONE_MB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_MB_BI)) + " MB";
} else if (size.divide(ONE_KB_BI).compareTo(BigInteger.ZERO) > 0) {
displaySize = String.valueOf(size.divide(ONE_KB_BI)) + " KB";
} else {
displaySize = String.valueOf(size) + " bytes";
}
return displaySize;
}
/**
* Returns a human-readable version of the file size, where the input represents a specific number of bytes.
* <p>
* 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.
* </p>
* <p>
* Similarly for the 1MB and 1KB boundaries.
* </p>
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
* @see <a href="https://issues.apache.org/jira/browse/IO-226">IO-226 - should the rounding be changed?</a>
*/
// See https://issues.apache.org/jira/browse/IO-226 - should the rounding be changed?
public static String byteCountToDisplaySize(final long size) {
return byteCountToDisplaySize(BigInteger.valueOf(size));
}
//-----------------------------------------------------------------------
/**
* 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.
* <p>
* 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(final File file) throws IOException {
if (!file.exists()) {
openOutputStream(file).close();
}
final 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(final Collection<File> 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(final Collection<File> files, final File directory,
final IOFileFilter filter, final boolean includeSubDirectories) {
final File[] found = directory.listFiles((FileFilter) filter);
if (found != null) {
for (final 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.
* <p>
* 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.
* <p>
* An example: If you want to search through all directories called
* "temp" you pass in <code>FileFilterUtils.NameFileFilter("temp")</code>
* <p>
* Another common usage of this method is find files in a directory
* tree but ignoring the directories generated CVS. You can simply pass
* in <code>FileFilterUtils.makeCVSAware(null)</code>.
*
* @param directory the directory to search in
* @param fileFilter filter to apply when finding files. Must not be {@code null},
* use {@link TrueFileFilter#INSTANCE} to match all files in selected directories.
* @param dirFilter optional filter to apply when finding subdirectories.
* If this parameter is {@code null}, subdirectories will not be included in the
* search. Use {@link TrueFileFilter#INSTANCE} to match all directories.
* @return a 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<File> listFiles(
final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter) {
validateListFilesParameters(directory, fileFilter);
final IOFileFilter effFileFilter = setUpEffectiveFileFilter(fileFilter);
final IOFileFilter effDirFilter = setUpEffectiveDirFilter(dirFilter);
//Find files
final Collection<File> files = new java.util.LinkedList<>();
innerListFiles(files, directory,
FileFilterUtils.or(effFileFilter, effDirFilter), false);
return files;
}
/**
* Validates the given arguments.
* <ul>
* <li>Throws {@link IllegalArgumentException} if {@code directory} is not a directory</li>
* <li>Throws {@link NullPointerException} if {@code fileFilter} is null</li>
* </ul>
*
* @param directory The File to test
* @param fileFilter The IOFileFilter to test
*/
private static void validateListFilesParameters(final File directory, final IOFileFilter fileFilter) {
if (!directory.isDirectory()) {
throw new IllegalArgumentException("Parameter 'directory' is not a directory: " + 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(final 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(final 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.
* <p>
* The resulting collection includes the starting directory and
* any subdirectories that match the directory filter.
* <p>
*
* @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 {@code null}, subdirectories will not be included in the
* search. Use TrueFileFilter.INSTANCE to match all directories.
* @return a collection of java.io.File with the matching files
* @see org.apache.commons.io.FileUtils#listFiles
* @see org.apache.commons.io.filefilter.FileFilterUtils
* @see org.apache.commons.io.filefilter.NameFileFilter
* @since 2.2
*/
public static Collection<File> listFilesAndDirs(
final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter) {
validateListFilesParameters(directory, fileFilter);
final IOFileFilter effFileFilter = setUpEffectiveFileFilter(fileFilter);
final IOFileFilter effDirFilter = setUpEffectiveDirFilter(dirFilter);
//Find files
final Collection<File> 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).
* <p>
* All files found are filtered by an IOFileFilter. This method is
* based on {@link #listFiles(File, IOFileFilter, IOFileFilter)},
* which supports Iterable ('foreach' loop).
* <p>
* @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 {@code 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<File> iterateFiles(
final File directory, final IOFileFilter fileFilter, final IOFileFilter dirFilter) {
return listFiles(directory, fileFilter, dirFilter).iterator();
}
/**
* Allows iteration over the files in given directory (and optionally
* its subdirectories).
* <p>
* All files found are filtered by an IOFileFilter. This method is
* based on {@link #listFilesAndDirs(File, IOFileFilter, IOFileFilter)},
* which supports Iterable ('foreach' loop).
* <p>
* 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 {@code 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<File> iterateFilesAndDirs(final File directory, final IOFileFilter fileFilter,
final 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(final String[] extensions) {
final 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 {@code null}, all files are returned.
* @param recursive if true all subdirectories are searched as well
* @return a collection of java.io.File with the matching files
*/
public static Collection<File> listFiles(
final File directory, final String[] extensions, final boolean recursive) {
IOFileFilter filter;
if (extensions == null) {
filter = TrueFileFilter.INSTANCE;
} else {
final 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 {@code 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<File> iterateFiles(
final File directory, final String[] extensions, final boolean recursive) {
return listFiles(directory, extensions, recursive).iterator();
}
//-----------------------------------------------------------------------
/**
* Compares the contents of two files to determine if they are equal or not.
* <p>
* 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.
* <p>
* 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(final File file1, final File file2) throws IOException {
final 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;
}
try (InputStream input1 = new FileInputStream(file1);
InputStream input2 = new FileInputStream(file2)) {
return IOUtils.contentEquals(input1, input2);
}
}
//-----------------------------------------------------------------------
/**
* Compares the contents of two files to determine if they are equal or not.
* <p>
* This method checks to see if the two files point to the same file,
* before resorting to line-by-line comparison of the contents.
* <p>
*
* @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
* @see IOUtils#contentEqualsIgnoreEOL(Reader, Reader)
* @since 2.2
*/
public static boolean contentEqualsIgnoreEOL(final File file1, final File file2, final String charsetName)
throws IOException {
final 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;
}
try (Reader input1 = charsetName == null
? new InputStreamReader(new FileInputStream(file1), Charset.defaultCharset())
: new InputStreamReader(new FileInputStream(file1), charsetName);
Reader input2 = charsetName == null
? new InputStreamReader(new FileInputStream(file2), Charset.defaultCharset())
: new InputStreamReader(new FileInputStream(file2), charsetName)) {
return IOUtils.contentEqualsIgnoreEOL(input1, input2);
}
}
//-----------------------------------------------------------------------
/**
* Convert from a <code>URL</code> to a <code>File</code>.
* <p>
* From version 1.1 this method will decode the URL.
* Syntax such as <code>file:///my%20docs/file.txt</code> will be
* correctly decoded to <code>/my docs/file.txt</code>. 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, {@code null} returns {@code null}
* @return the equivalent <code>File</code> object, or {@code null}
* if the URL's protocol is not <code>file</code>
*/
public static File toFile(final 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 {@code null}.
* @return The decoded URL or {@code null} if the input was
* {@code null}.
*/
static String decodeUrl(final String url) {
String decoded = url;
if (url != null && url.indexOf('%') >= 0) {
final int n = url.length();
final StringBuilder buffer = new StringBuilder();
final ByteBuffer bytes = ByteBuffer.allocate(n);
for (int i = 0; i < n; ) {
if (url.charAt(i) == '%') {
try {
do {
final 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 (final RuntimeException e) {
// malformed percent-encoded octet, fall through and
// append characters literally
} finally {
if (bytes.position() > 0) {
bytes.flip();
buffer.append(StandardCharsets.UTF_8.decode(bytes).toString());
bytes.clear();
}
}
}
buffer.append(url.charAt(i++));
}
decoded = buffer.toString();
}
return decoded;
}
/**
* Converts each of an array of <code>URL</code> to a <code>File</code>.
* <p>
* Returns an array of the same size as the input.
* If the input is {@code null}, an empty array is returned.
* If the input contains {@code null}, the output array contains {@code null} at the same
* index.
* <p>
* This method will decode the URL.
* Syntax such as <code>file:///my%20docs/file.txt</code> will be
* correctly decoded to <code>/my docs/file.txt</code>.
*
* @param urls the file URLs to convert, {@code null} returns empty array
* @return a non-{@code null} array of Files matching the input, with a {@code null} item
* if there was a {@code 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(final URL[] urls) {
if (urls == null || urls.length == 0) {
return EMPTY_FILE_ARRAY;
}
final File[] files = new File[urls.length];
for (int i = 0; i < urls.length; i++) {
final 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 <code>File</code> to a <code>URL</code>.
* <p>
* Returns an array of the same size as the input.
*
* @param files the files to convert, must not be {@code null}
* @return an array of URLs matching the input
* @throws IOException if a file cannot be converted
* @throws NullPointerException if the parameter is null
*/
public static URL[] toURLs(final File[] files) throws IOException {
final 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.
* <p>
* 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.
* <p>
* <strong>Note:</strong> 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 {@code null}
* @param destDir the directory to place the copy in, must not be {@code 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(final File srcFile, final File destDir) throws IOException {
copyFileToDirectory(srcFile, destDir, true);
}
/**
* Copies a file to a directory optionally preserving the file date.
* <p>
* 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.
* <p>
* <strong>Note:</strong> Setting <code>preserveFileDate</code> to
* {@code 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 {@code null}
* @param destDir the directory to place the copy in, must not be {@code 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 {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @throws IOException if the output file length is not the same as the input file length after the copy
* completes
* @see #copyFile(File, File, boolean)
* @since 1.3
*/
public static void copyFileToDirectory(final File srcFile, final File destDir, final 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");
}
final File destFile = new File(destDir, srcFile.getName());
copyFile(srcFile, destFile, preserveFileDate);