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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.file;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.math.BigInteger;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.file.AccessDeniedException;
import java.nio.file.CopyOption;
import java.nio.file.DirectoryStream;
import java.nio.file.FileVisitOption;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.NoSuchFileException;
import java.nio.file.NotDirectoryException;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.AclEntry;
import java.nio.file.attribute.AclFileAttributeView;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.DosFileAttributeView;
import java.nio.file.attribute.DosFileAttributes;
import java.nio.file.attribute.FileAttribute;
import java.nio.file.attribute.FileTime;
import java.nio.file.attribute.PosixFileAttributeView;
import java.nio.file.attribute.PosixFileAttributes;
import java.nio.file.attribute.PosixFilePermission;
import java.time.Duration;
import java.time.Instant;
import java.time.chrono.ChronoZonedDateTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collector;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.apache.commons.io.Charsets;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.RandomAccessFileMode;
import org.apache.commons.io.RandomAccessFiles;
import org.apache.commons.io.ThreadUtils;
import org.apache.commons.io.file.Counters.PathCounters;
import org.apache.commons.io.file.attribute.FileTimes;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.function.IOFunction;
import org.apache.commons.io.function.IOSupplier;
/**
* NIO Path utilities.
*
* @since 2.7
*/
public final class PathUtils {
/**
* Private worker/holder that computes and tracks relative path names and their equality. We reuse the sorted relative lists when comparing directories.
*/
private static final class RelativeSortedPaths {
final boolean equals;
// final List relativeDirList1; // might need later?
// final List relativeDirList2; // might need later?
final List relativeFileList1;
final List relativeFileList2;
/**
* Constructs and initializes a new instance by accumulating directory and file info.
*
* @param dir1 First directory to compare.
* @param dir2 Seconds directory to compare.
* @param maxDepth See {@link Files#walkFileTree(Path,Set,int,FileVisitor)}.
* @param linkOptions Options indicating how symbolic links are handled.
* @param fileVisitOptions See {@link Files#walkFileTree(Path,Set,int,FileVisitor)}.
* @throws IOException if an I/O error is thrown by a visitor method.
*/
private RelativeSortedPaths(final Path dir1, final Path dir2, final int maxDepth, final LinkOption[] linkOptions,
final FileVisitOption[] fileVisitOptions) throws IOException {
final List tmpRelativeDirList1;
final List tmpRelativeDirList2;
List tmpRelativeFileList1 = null;
List tmpRelativeFileList2 = null;
if (dir1 == null && dir2 == null) {
equals = true;
} else if (dir1 == null ^ dir2 == null) {
equals = false;
} else {
final boolean parentDirNotExists1 = Files.notExists(dir1, linkOptions);
final boolean parentDirNotExists2 = Files.notExists(dir2, linkOptions);
if (parentDirNotExists1 || parentDirNotExists2) {
equals = parentDirNotExists1 && parentDirNotExists2;
} else {
final AccumulatorPathVisitor visitor1 = accumulate(dir1, maxDepth, fileVisitOptions);
final AccumulatorPathVisitor visitor2 = accumulate(dir2, maxDepth, fileVisitOptions);
if (visitor1.getDirList().size() != visitor2.getDirList().size() || visitor1.getFileList().size() != visitor2.getFileList().size()) {
equals = false;
} else {
tmpRelativeDirList1 = visitor1.relativizeDirectories(dir1, true, null);
tmpRelativeDirList2 = visitor2.relativizeDirectories(dir2, true, null);
if (!tmpRelativeDirList1.equals(tmpRelativeDirList2)) {
equals = false;
} else {
tmpRelativeFileList1 = visitor1.relativizeFiles(dir1, true, null);
tmpRelativeFileList2 = visitor2.relativizeFiles(dir2, true, null);
equals = tmpRelativeFileList1.equals(tmpRelativeFileList2);
}
}
}
}
// relativeDirList1 = tmpRelativeDirList1;
// relativeDirList2 = tmpRelativeDirList2;
relativeFileList1 = tmpRelativeFileList1;
relativeFileList2 = tmpRelativeFileList2;
}
}
private static final OpenOption[] OPEN_OPTIONS_TRUNCATE = { StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING };
private static final OpenOption[] OPEN_OPTIONS_APPEND = { StandardOpenOption.CREATE, StandardOpenOption.APPEND };
/**
* Empty {@link CopyOption} array.
*
* @since 2.8.0
*/
public static final CopyOption[] EMPTY_COPY_OPTIONS = {};
/**
* Empty {@link DeleteOption} array.
*
* @since 2.8.0
*/
public static final DeleteOption[] EMPTY_DELETE_OPTION_ARRAY = {};
/**
* Empty {@link FileAttribute} array.
*
* @since 2.13.0
*/
public static final FileAttribute[] EMPTY_FILE_ATTRIBUTE_ARRAY = {};
/**
* Empty {@link FileVisitOption} array.
*/
public static final FileVisitOption[] EMPTY_FILE_VISIT_OPTION_ARRAY = {};
/**
* Empty {@link LinkOption} array.
*/
public static final LinkOption[] EMPTY_LINK_OPTION_ARRAY = {};
/**
* {@link LinkOption} array for {@link LinkOption#NOFOLLOW_LINKS}.
*
* @since 2.9.0
* @deprecated Use {@link #noFollowLinkOptionArray()}.
*/
@Deprecated
public static final LinkOption[] NOFOLLOW_LINK_OPTION_ARRAY = { LinkOption.NOFOLLOW_LINKS };
/**
* A LinkOption used to follow link in this class, the inverse of {@link LinkOption#NOFOLLOW_LINKS}.
*
* @since 2.12.0
*/
static final LinkOption NULL_LINK_OPTION = null;
/**
* Empty {@link OpenOption} array.
*/
public static final OpenOption[] EMPTY_OPEN_OPTION_ARRAY = {};
/**
* Empty {@link Path} array.
*
* @since 2.9.0
*/
public static final Path[] EMPTY_PATH_ARRAY = {};
/**
* Accumulates file tree information in a {@link AccumulatorPathVisitor}.
*
* @param directory The directory to accumulate information.
* @param maxDepth See {@link Files#walkFileTree(Path,Set,int,FileVisitor)}.
* @param fileVisitOptions See {@link Files#walkFileTree(Path,Set,int,FileVisitor)}.
* @throws IOException if an I/O error is thrown by a visitor method.
* @return file tree information.
*/
private static AccumulatorPathVisitor accumulate(final Path directory, final int maxDepth, final FileVisitOption[] fileVisitOptions) throws IOException {
return visitFileTree(AccumulatorPathVisitor.withLongCounters(), directory, toFileVisitOptionSet(fileVisitOptions), maxDepth);
}
/**
* Cleans a directory including subdirectories without deleting directories.
*
* @param directory directory to clean.
* @return The visitation path counters.
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static PathCounters cleanDirectory(final Path directory) throws IOException {
return cleanDirectory(directory, EMPTY_DELETE_OPTION_ARRAY);
}
/**
* Cleans a directory including subdirectories without deleting directories.
*
* @param directory directory to clean.
* @param deleteOptions How to handle deletion.
* @return The visitation path counters.
* @throws IOException if an I/O error is thrown by a visitor method.
* @since 2.8.0
*/
public static PathCounters cleanDirectory(final Path directory, final DeleteOption... deleteOptions) throws IOException {
return visitFileTree(new CleaningPathVisitor(Counters.longPathCounters(), deleteOptions), directory).getPathCounters();
}
/**
* Compares the given {@link Path}'s last modified time to the given file time.
*
* @param file the {@link Path} to test.
* @param fileTime the time reference.
* @param options options indicating how to handle symbolic links.
* @return See {@link FileTime#compareTo(FileTime)}
* @throws IOException if an I/O error occurs.
* @throws NullPointerException if the file is {@code null}.
*/
private static int compareLastModifiedTimeTo(final Path file, final FileTime fileTime, final LinkOption... options) throws IOException {
return getLastModifiedTime(file, options).compareTo(fileTime);
}
/**
* Copies the InputStream from the supplier with {@link Files#copy(InputStream, Path, CopyOption...)}.
*
* @param in Supplies the InputStream.
* @param target See {@link Files#copy(InputStream, Path, CopyOption...)}.
* @param copyOptions See {@link Files#copy(InputStream, Path, CopyOption...)}.
* @return See {@link Files#copy(InputStream, Path, CopyOption...)}
* @throws IOException See {@link Files#copy(InputStream, Path, CopyOption...)}
* @since 2.12.0
*/
public static long copy(final IOSupplier in, final Path target, final CopyOption... copyOptions) throws IOException {
try (InputStream inputStream = in.get()) {
return Files.copy(inputStream, target, copyOptions);
}
}
/**
* Copies a directory to another directory.
*
* @param sourceDirectory The source directory.
* @param targetDirectory The target directory.
* @param copyOptions Specifies how the copying should be done.
* @return The visitation path counters.
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static PathCounters copyDirectory(final Path sourceDirectory, final Path targetDirectory, final CopyOption... copyOptions) throws IOException {
final Path absoluteSource = sourceDirectory.toAbsolutePath();
return visitFileTree(new CopyDirectoryVisitor(Counters.longPathCounters(), absoluteSource, targetDirectory, copyOptions), absoluteSource)
.getPathCounters();
}
/**
* Copies a URL to a directory.
*
* @param sourceFile The source URL.
* @param targetFile The target file.
* @param copyOptions Specifies how the copying should be done.
* @return The target file
* @throws IOException if an I/O error occurs.
* @see Files#copy(InputStream, Path, CopyOption...)
*/
public static Path copyFile(final URL sourceFile, final Path targetFile, final CopyOption... copyOptions) throws IOException {
copy(sourceFile::openStream, targetFile, copyOptions);
return targetFile;
}
/**
* Copies a file to a directory.
*
* @param sourceFile The source file.
* @param targetDirectory The target directory.
* @param copyOptions Specifies how the copying should be done.
* @return The target file
* @throws IOException if an I/O error occurs.
* @see Files#copy(Path, Path, CopyOption...)
*/
public static Path copyFileToDirectory(final Path sourceFile, final Path targetDirectory, final CopyOption... copyOptions) throws IOException {
return Files.copy(sourceFile, targetDirectory.resolve(sourceFile.getFileName()), copyOptions);
}
/**
* Copies a URL to a directory.
*
* @param sourceFile The source URL.
* @param targetDirectory The target directory.
* @param copyOptions Specifies how the copying should be done.
* @return The target file
* @throws IOException if an I/O error occurs.
* @see Files#copy(InputStream, Path, CopyOption...)
*/
public static Path copyFileToDirectory(final URL sourceFile, final Path targetDirectory, final CopyOption... copyOptions) throws IOException {
final Path resolve = targetDirectory.resolve(FilenameUtils.getName(sourceFile.getFile()));
copy(sourceFile::openStream, resolve, copyOptions);
return resolve;
}
/**
* Counts aspects of a directory including subdirectories.
*
* @param directory directory to delete.
* @return The visitor used to count the given directory.
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static PathCounters countDirectory(final Path directory) throws IOException {
return visitFileTree(CountingPathVisitor.withLongCounters(), directory).getPathCounters();
}
/**
* Counts aspects of a directory including subdirectories.
*
* @param directory directory to count.
* @return The visitor used to count the given directory.
* @throws IOException if an I/O error occurs.
* @since 2.12.0
*/
public static PathCounters countDirectoryAsBigInteger(final Path directory) throws IOException {
return visitFileTree(CountingPathVisitor.withBigIntegerCounters(), directory).getPathCounters();
}
/**
* Creates the parent directories for the given {@code path}.
*
* If the parent directory already exists, then return it.
*
*
* @param path The path to a file (or directory).
* @param attrs An optional list of file attributes to set atomically when creating the directories.
* @return The Path for the {@code path}'s parent directory or null if the given path has no parent.
* @throws IOException if an I/O error occurs.
* @since 2.9.0
*/
public static Path createParentDirectories(final Path path, final FileAttribute... attrs) throws IOException {
return createParentDirectories(path, LinkOption.NOFOLLOW_LINKS, attrs);
}
/**
* Creates the parent directories for the given {@code path}.
*
* If the parent directory already exists, then return it.
*
*
* @param path The path to a file (or directory).
* @param linkOption A {@link LinkOption} or null.
* @param attrs An optional list of file attributes to set atomically when creating the directories.
* @return The Path for the {@code path}'s parent directory or null if the given path has no parent.
* @throws IOException if an I/O error occurs.
* @since 2.12.0
*/
public static Path createParentDirectories(final Path path, final LinkOption linkOption, final FileAttribute... attrs) throws IOException {
Path parent = getParent(path);
parent = linkOption == LinkOption.NOFOLLOW_LINKS ? parent : readIfSymbolicLink(parent);
if (parent == null) {
return null;
}
final boolean exists = linkOption == null ? Files.exists(parent) : Files.exists(parent, linkOption);
return exists ? parent : Files.createDirectories(parent, attrs);
}
/**
* Gets the current directory.
*
* @return the current directory.
*
* @since 2.9.0
*/
public static Path current() {
return Paths.get(".");
}
/**
* Deletes a file or directory. If the path is a directory, delete it and all subdirectories.
*
* The difference between File.delete() and this method are:
*
*
* - A directory to delete does not have to be empty.
* - You get exceptions when a file or directory cannot be deleted; {@link java.io.File#delete()} returns a boolean.
*
*
* @param path file or directory to delete, must not be {@code null}
* @return The visitor used to delete the given directory.
* @throws NullPointerException if the directory is {@code null}
* @throws IOException if an I/O error is thrown by a visitor method or if an I/O error occurs.
*/
public static PathCounters delete(final Path path) throws IOException {
return delete(path, EMPTY_DELETE_OPTION_ARRAY);
}
/**
* Deletes a file or directory. If the path is a directory, delete it and all subdirectories.
*
* The difference between File.delete() and this method are:
*
*
* - A directory to delete does not have to be empty.
* - You get exceptions when a file or directory cannot be deleted; {@link java.io.File#delete()} returns a boolean.
*
*
* @param path file or directory to delete, must not be {@code null}
* @param deleteOptions How to handle deletion.
* @return The visitor used to delete the given directory.
* @throws NullPointerException if the directory is {@code null}
* @throws IOException if an I/O error is thrown by a visitor method or if an I/O error occurs.
* @since 2.8.0
*/
public static PathCounters delete(final Path path, final DeleteOption... deleteOptions) throws IOException {
// File deletion through Files deletes links, not targets, so use LinkOption.NOFOLLOW_LINKS.
return Files.isDirectory(path, LinkOption.NOFOLLOW_LINKS) ? deleteDirectory(path, deleteOptions) : deleteFile(path, deleteOptions);
}
/**
* Deletes a file or directory. If the path is a directory, delete it and all subdirectories.
*
* The difference between File.delete() and this method are:
*
*
* - A directory to delete does not have to be empty.
* - You get exceptions when a file or directory cannot be deleted; {@link java.io.File#delete()} returns a boolean.
*
*
* @param path file or directory to delete, must not be {@code null}
* @param linkOptions How to handle symbolic links.
* @param deleteOptions How to handle deletion.
* @return The visitor used to delete the given directory.
* @throws NullPointerException if the directory is {@code null}
* @throws IOException if an I/O error is thrown by a visitor method or if an I/O error occurs.
* @since 2.9.0
*/
public static PathCounters delete(final Path path, final LinkOption[] linkOptions, final DeleteOption... deleteOptions) throws IOException {
// File deletion through Files deletes links, not targets, so use LinkOption.NOFOLLOW_LINKS.
return Files.isDirectory(path, linkOptions) ? deleteDirectory(path, linkOptions, deleteOptions) : deleteFile(path, linkOptions, deleteOptions);
}
/**
* Deletes a directory including subdirectories.
*
* @param directory directory to delete.
* @return The visitor used to delete the given directory.
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static PathCounters deleteDirectory(final Path directory) throws IOException {
return deleteDirectory(directory, EMPTY_DELETE_OPTION_ARRAY);
}
/**
* Deletes a directory including subdirectories.
*
* @param directory directory to delete.
* @param deleteOptions How to handle deletion.
* @return The visitor used to delete the given directory.
* @throws IOException if an I/O error is thrown by a visitor method.
* @since 2.8.0
*/
public static PathCounters deleteDirectory(final Path directory, final DeleteOption... deleteOptions) throws IOException {
final LinkOption[] linkOptions = PathUtils.noFollowLinkOptionArray();
// POSIX ops will noop on non-POSIX.
return withPosixFileAttributes(getParent(directory), linkOptions, overrideReadOnly(deleteOptions),
pfa -> visitFileTree(new DeletingPathVisitor(Counters.longPathCounters(), linkOptions, deleteOptions), directory).getPathCounters());
}
/**
* Deletes a directory including subdirectories.
*
* @param directory directory to delete.
* @param linkOptions How to handle symbolic links.
* @param deleteOptions How to handle deletion.
* @return The visitor used to delete the given directory.
* @throws IOException if an I/O error is thrown by a visitor method.
* @since 2.9.0
*/
public static PathCounters deleteDirectory(final Path directory, final LinkOption[] linkOptions, final DeleteOption... deleteOptions) throws IOException {
return visitFileTree(new DeletingPathVisitor(Counters.longPathCounters(), linkOptions, deleteOptions), directory).getPathCounters();
}
/**
* Deletes the given file.
*
* @param file The file to delete.
* @return A visitor with path counts set to 1 file, 0 directories, and the size of the deleted file.
* @throws IOException if an I/O error occurs.
* @throws NoSuchFileException if the file is a directory.
*/
public static PathCounters deleteFile(final Path file) throws IOException {
return deleteFile(file, EMPTY_DELETE_OPTION_ARRAY);
}
/**
* Deletes the given file.
*
* @param file The file to delete.
* @param deleteOptions How to handle deletion.
* @return A visitor with path counts set to 1 file, 0 directories, and the size of the deleted file.
* @throws IOException if an I/O error occurs.
* @throws NoSuchFileException if the file is a directory.
* @since 2.8.0
*/
public static PathCounters deleteFile(final Path file, final DeleteOption... deleteOptions) throws IOException {
// Files.deleteIfExists() never follows links, so use LinkOption.NOFOLLOW_LINKS in other calls to Files.
return deleteFile(file, noFollowLinkOptionArray(), deleteOptions);
}
/**
* Deletes the given file.
*
* @param file The file to delete.
* @param linkOptions How to handle symbolic links.
* @param deleteOptions How to handle deletion.
* @return A visitor with path counts set to 1 file, 0 directories, and the size of the deleted file.
* @throws IOException if an I/O error occurs.
* @throws NoSuchFileException if the file is a directory.
* @since 2.9.0
*/
public static PathCounters deleteFile(final Path file, final LinkOption[] linkOptions, final DeleteOption... deleteOptions)
throws NoSuchFileException, IOException {
//
// TODO Needs clean up
//
if (Files.isDirectory(file, linkOptions)) {
throw new NoSuchFileException(file.toString());
}
final PathCounters pathCounts = Counters.longPathCounters();
boolean exists = exists(file, linkOptions);
long size = exists && !Files.isSymbolicLink(file) ? Files.size(file) : 0;
try {
if (Files.deleteIfExists(file)) {
pathCounts.getFileCounter().increment();
pathCounts.getByteCounter().add(size);
return pathCounts;
}
} catch (final AccessDeniedException ignored) {
// Ignore and try again below.
}
final Path parent = getParent(file);
PosixFileAttributes posixFileAttributes = null;
try {
if (overrideReadOnly(deleteOptions)) {
posixFileAttributes = readPosixFileAttributes(parent, linkOptions);
setReadOnly(file, false, linkOptions);
}
// Read size _after_ having read/execute access on POSIX.
exists = exists(file, linkOptions);
size = exists && !Files.isSymbolicLink(file) ? Files.size(file) : 0;
if (Files.deleteIfExists(file)) {
pathCounts.getFileCounter().increment();
pathCounts.getByteCounter().add(size);
}
} finally {
if (posixFileAttributes != null) {
Files.setPosixFilePermissions(parent, posixFileAttributes.permissions());
}
}
return pathCounts;
}
/**
* Delegates to {@link File#deleteOnExit()}.
*
* @param path the path to delete.
* @since 3.13.0
*/
public static void deleteOnExit(final Path path) {
Objects.requireNonNull(path.toFile()).deleteOnExit();
}
/**
* Compares the file sets of two Paths to determine if they are equal or not while considering file contents. The comparison includes all files in all
* subdirectories.
*
* @param path1 The first directory.
* @param path2 The second directory.
* @return Whether the two directories contain the same files while considering file contents.
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static boolean directoryAndFileContentEquals(final Path path1, final Path path2) throws IOException {
return directoryAndFileContentEquals(path1, path2, EMPTY_LINK_OPTION_ARRAY, EMPTY_OPEN_OPTION_ARRAY, EMPTY_FILE_VISIT_OPTION_ARRAY);
}
/**
* Compares the file sets of two Paths to determine if they are equal or not while considering file contents. The comparison includes all files in all
* subdirectories.
*
* @param path1 The first directory.
* @param path2 The second directory.
* @param linkOptions options to follow links.
* @param openOptions options to open files.
* @param fileVisitOption options to configure traversal.
* @return Whether the two directories contain the same files while considering file contents.
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static boolean directoryAndFileContentEquals(final Path path1, final Path path2, final LinkOption[] linkOptions, final OpenOption[] openOptions,
final FileVisitOption[] fileVisitOption) throws IOException {
// First walk both file trees and gather normalized paths.
if (path1 == null && path2 == null) {
return true;
}
if (path1 == null || path2 == null) {
return false;
}
if (notExists(path1) && notExists(path2)) {
return true;
}
final RelativeSortedPaths relativeSortedPaths = new RelativeSortedPaths(path1, path2, Integer.MAX_VALUE, linkOptions, fileVisitOption);
// If the normalized path names and counts are not the same, no need to compare contents.
if (!relativeSortedPaths.equals) {
return false;
}
// Both visitors contain the same normalized paths, we can compare file contents.
final List fileList1 = relativeSortedPaths.relativeFileList1;
final List fileList2 = relativeSortedPaths.relativeFileList2;
for (final Path path : fileList1) {
final int binarySearch = Collections.binarySearch(fileList2, path);
if (binarySearch <= -1) {
throw new IllegalStateException("Unexpected mismatch.");
}
if (!fileContentEquals(path1.resolve(path), path2.resolve(path), linkOptions, openOptions)) {
return false;
}
}
return true;
}
/**
* Compares the file sets of two Paths to determine if they are equal or not without considering file contents. The comparison includes all files in all
* subdirectories.
*
* @param path1 The first directory.
* @param path2 The second directory.
* @return Whether the two directories contain the same files without considering file contents.
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static boolean directoryContentEquals(final Path path1, final Path path2) throws IOException {
return directoryContentEquals(path1, path2, Integer.MAX_VALUE, EMPTY_LINK_OPTION_ARRAY, EMPTY_FILE_VISIT_OPTION_ARRAY);
}
/**
* Compares the file sets of two Paths to determine if they are equal or not without considering file contents. The comparison includes all files in all
* subdirectories.
*
* @param path1 The first directory.
* @param path2 The second directory.
* @param maxDepth See {@link Files#walkFileTree(Path,Set,int,FileVisitor)}.
* @param linkOptions options to follow links.
* @param fileVisitOptions options to configure the traversal
* @return Whether the two directories contain the same files without considering file contents.
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static boolean directoryContentEquals(final Path path1, final Path path2, final int maxDepth, final LinkOption[] linkOptions,
final FileVisitOption[] fileVisitOptions) throws IOException {
return new RelativeSortedPaths(path1, path2, maxDepth, linkOptions, fileVisitOptions).equals;
}
private static boolean exists(final Path path, final LinkOption... options) {
Objects.requireNonNull(path, "path");
return options != null ? Files.exists(path, options) : Files.exists(path);
}
/**
* Compares the file contents of two Paths to determine if they are equal or not.
*
* File content is accessed through {@link Files#newInputStream(Path,OpenOption...)}.
*
*
* @param path1 the first stream.
* @param path2 the second stream.
* @return true if the content of the streams are equal or they both don't exist, false otherwise.
* @throws NullPointerException if either input is null.
* @throws IOException if an I/O error occurs.
* @see org.apache.commons.io.FileUtils#contentEquals(java.io.File, java.io.File)
*/
public static boolean fileContentEquals(final Path path1, final Path path2) throws IOException {
return fileContentEquals(path1, path2, EMPTY_LINK_OPTION_ARRAY, EMPTY_OPEN_OPTION_ARRAY);
}
/**
* Compares the file contents of two Paths to determine if they are equal or not.
*
* File content is accessed through {@link RandomAccessFileMode#create(Path)}.
*
*
* @param path1 the first stream.
* @param path2 the second stream.
* @param linkOptions options specifying how files are followed.
* @param openOptions ignored.
* @return true if the content of the streams are equal or they both don't exist, false otherwise.
* @throws NullPointerException if openOptions is null.
* @throws IOException if an I/O error occurs.
* @see org.apache.commons.io.FileUtils#contentEquals(java.io.File, java.io.File)
*/
public static boolean fileContentEquals(final Path path1, final Path path2, final LinkOption[] linkOptions, final OpenOption[] openOptions)
throws IOException {
if (path1 == null && path2 == null) {
return true;
}
if (path1 == null || path2 == null) {
return false;
}
final Path nPath1 = path1.normalize();
final Path nPath2 = path2.normalize();
final boolean path1Exists = exists(nPath1, linkOptions);
if (path1Exists != exists(nPath2, linkOptions)) {
return false;
}
if (!path1Exists) {
// Two not existing files are equal?
// Same as FileUtils
return true;
}
if (Files.isDirectory(nPath1, linkOptions)) {
// don't compare directory contents.
throw new IOException("Can't compare directories, only files: " + nPath1);
}
if (Files.isDirectory(nPath2, linkOptions)) {
// don't compare directory contents.
throw new IOException("Can't compare directories, only files: " + nPath2);
}
if (Files.size(nPath1) != Files.size(nPath2)) {
// lengths differ, cannot be equal
return false;
}
if (path1.equals(path2)) {
// same file
return true;
}
// Faster:
try (RandomAccessFile raf1 = RandomAccessFileMode.READ_ONLY.create(path1.toRealPath(linkOptions));
RandomAccessFile raf2 = RandomAccessFileMode.READ_ONLY.create(path2.toRealPath(linkOptions))) {
return RandomAccessFiles.contentEquals(raf1, raf2);
} catch (final UnsupportedOperationException e) {
// Slower:
// Handle
// java.lang.UnsupportedOperationException
// at com.sun.nio.zipfs.ZipPath.toFile(ZipPath.java:656)
try (InputStream inputStream1 = Files.newInputStream(nPath1, openOptions);
InputStream inputStream2 = Files.newInputStream(nPath2, openOptions)) {
return IOUtils.contentEquals(inputStream1, inputStream2);
}
}
}
/**
*
* Applies an {@link IOFileFilter} to the provided {@link File} objects. The resulting array is a subset of the original file list that matches the provided
* filter.
*
*
*
* The {@link Set} returned by this method is not guaranteed to be thread safe.
*
*
*
* Set<File> allFiles = ...
* Set<File> javaFiles = FileFilterUtils.filterSet(allFiles,
* FileFilterUtils.suffixFileFilter(".java"));
*
*
* @param filter the filter to apply to the set of files.
* @param paths the array of files to apply the filter to.
*
* @return a subset of {@code files} that is accepted by the file filter.
* @throws NullPointerException if the filter is {@code null}
* @throws IllegalArgumentException if {@code files} contains a {@code null} value.
*
* @since 2.9.0
*/
public static Path[] filter(final PathFilter filter, final Path... paths) {
Objects.requireNonNull(filter, "filter");
if (paths == null) {
return EMPTY_PATH_ARRAY;
}
return filterPaths(filter, Stream.of(paths), Collectors.toList()).toArray(EMPTY_PATH_ARRAY);
}
private static R filterPaths(final PathFilter filter, final Stream stream, final Collector collector) {
Objects.requireNonNull(filter, "filter");
Objects.requireNonNull(collector, "collector");
if (stream == null) {
return Stream.empty().collect(collector);
}
return stream.filter(p -> {
try {
return p != null && filter.accept(p, readBasicFileAttributes(p)) == FileVisitResult.CONTINUE;
} catch (final IOException e) {
return false;
}
}).collect(collector);
}
/**
* Reads the access control list from a file attribute view.
*
* @param sourcePath the path to the file.
* @return a file attribute view of the given type, or null if the attribute view type is not available.
* @throws IOException if an I/O error occurs.
* @since 2.8.0
*/
public static List getAclEntryList(final Path sourcePath) throws IOException {
final AclFileAttributeView fileAttributeView = getAclFileAttributeView(sourcePath);
return fileAttributeView == null ? null : fileAttributeView.getAcl();
}
/**
* Shorthand for {@code Files.getFileAttributeView(path, AclFileAttributeView.class)}.
*
* @param path the path to the file.
* @param options how to handle symbolic links.
* @return a AclFileAttributeView, or {@code null} if the attribute view type is not available.
* @since 2.12.0
*/
public static AclFileAttributeView getAclFileAttributeView(final Path path, final LinkOption... options) {
return Files.getFileAttributeView(path, AclFileAttributeView.class, options);
}
/**
* Gets the base name (the part up to and not including the last ".") of the last path segment of a file name.
*
* Will return the file name itself if it doesn't contain any dots. All leading directories of the {@code file name} parameter are skipped.
*
*
* @return the base name of file name
* @param path the path of the file to obtain the base name of.
* @since 2.16.0
*/
public static String getBaseName(final Path path) {
if (path == null) {
return null;
}
final Path fileName = path.getFileName();
return fileName != null ? FilenameUtils.removeExtension(fileName.toString()) : null;
}
/**
* Shorthand for {@code Files.getFileAttributeView(path, DosFileAttributeView.class)}.
*
* @param path the path to the file.
* @param options how to handle symbolic links.
* @return a DosFileAttributeView, or {@code null} if the attribute view type is not available.
* @since 2.12.0
*/
public static DosFileAttributeView getDosFileAttributeView(final Path path, final LinkOption... options) {
return Files.getFileAttributeView(path, DosFileAttributeView.class, options);
}
/**
* Gets the extension of a Path.
*
* This method returns the textual part of the Path after the last dot.
*
*
* foo.txt --> "txt"
* a/b/c.jpg --> "jpg"
* a/b.txt/c --> ""
* a/b/c --> ""
*
*
* The output will be the same irrespective of the machine that the code is running on.
*
*
* @param path the path to query.
* @return the extension of the file or an empty string if none exists or {@code null} if the fileName is {@code null}.
* @since 2.16.0
*/
public static String getExtension(final Path path) {
final String fileName = getFileNameString(path);
return fileName != null ? FilenameUtils.getExtension(fileName) : null;
}
/**
* Gets the Path's file name and apply the given function if the file name is non-null.
*
* @param The function's result type.
* @param path the path to query.
* @param function function to apply to the file name.
* @return the Path's file name as a string or null.
* @see Path#getFileName()
* @since 2.16.0
*/
public static R getFileName(final Path path, final Function function) {
final Path fileName = path != null ? path.getFileName() : null;
return fileName != null ? function.apply(fileName) : null;
}
/**
* Gets the Path's file name as a string.
*
* @param path the path to query.
* @return the Path's file name as a string or null.
* @see Path#getFileName()
* @since 2.16.0
*/
public static String getFileNameString(final Path path) {
return getFileName(path, Path::toString);
}
/**
* Gets the file's last modified time or null if the file does not exist.
*
* The method provides a workaround for bug JDK-8177809 where {@link File#lastModified()}
* looses milliseconds and always ends in 000. This bug is in OpenJDK 8 and 9, and fixed in 11.
*
*
* @param file the file to query.
* @return the file's last modified time.
* @throws IOException Thrown if an I/O error occurs.
* @since 2.12.0
*/
public static FileTime getLastModifiedFileTime(final File file) throws IOException {
return getLastModifiedFileTime(file.toPath(), null, EMPTY_LINK_OPTION_ARRAY);
}
/**
* Gets the file's last modified time or null if the file does not exist.
*
* @param path the file to query.
* @param defaultIfAbsent Returns this file time of the file does not exist, may be null.
* @param options options indicating how symbolic links are handled.
* @return the file's last modified time.
* @throws IOException Thrown if an I/O error occurs.
* @since 2.12.0
*/
public static FileTime getLastModifiedFileTime(final Path path, final FileTime defaultIfAbsent, final LinkOption... options) throws IOException {
return Files.exists(path) ? getLastModifiedTime(path, options) : defaultIfAbsent;
}
/**
* Gets the file's last modified time or null if the file does not exist.
*
* @param path the file to query.
* @param options options indicating how symbolic links are handled.
* @return the file's last modified time.
* @throws IOException Thrown if an I/O error occurs.
* @since 2.12.0
*/
public static FileTime getLastModifiedFileTime(final Path path, final LinkOption... options) throws IOException {
return getLastModifiedFileTime(path, null, options);
}
/**
* Gets the file's last modified time or null if the file does not exist.
*
* @param uri the file to query.
* @return the file's last modified time.
* @throws IOException Thrown if an I/O error occurs.
* @since 2.12.0
*/
public static FileTime getLastModifiedFileTime(final URI uri) throws IOException {
return getLastModifiedFileTime(Paths.get(uri), null, EMPTY_LINK_OPTION_ARRAY);
}
/**
* Gets the file's last modified time or null if the file does not exist.
*
* @param url the file to query.
* @return the file's last modified time.
* @throws IOException Thrown if an I/O error occurs.
* @throws URISyntaxException if the URL is not formatted strictly according to RFC2396 and cannot be converted to a URI.
* @since 2.12.0
*/
public static FileTime getLastModifiedFileTime(final URL url) throws IOException, URISyntaxException {
return getLastModifiedFileTime(url.toURI());
}
private static FileTime getLastModifiedTime(final Path path, final LinkOption... options) throws IOException {
return Files.getLastModifiedTime(Objects.requireNonNull(path, "path"), options);
}
private static Path getParent(final Path path) {
return path == null ? null : path.getParent();
}
/**
* Shorthand for {@code Files.getFileAttributeView(path, PosixFileAttributeView.class)}.
*
* @param path the path to the file.
* @param options how to handle symbolic links.
* @return a PosixFileAttributeView, or {@code null} if the attribute view type is not available.
* @since 2.12.0
*/
public static PosixFileAttributeView getPosixFileAttributeView(final Path path, final LinkOption... options) {
return Files.getFileAttributeView(path, PosixFileAttributeView.class, options);
}
/**
* Gets a {@link Path} representing the system temporary directory.
*
* @return the system temporary directory.
* @since 2.12.0
*/
public static Path getTempDirectory() {
return Paths.get(FileUtils.getTempDirectoryPath());
}
/**
* Tests whether the given {@link Path} is a directory or not. Implemented as a null-safe delegate to
* {@code Files.isDirectory(Path path, LinkOption... options)}.
*
* @param path the path to the file.
* @param options options indicating how to handle symbolic links
* @return {@code true} if the file is a directory; {@code false} if the path is null, the file does not exist, is not a directory, or it cannot be
* determined if the file is a directory or not.
* @throws SecurityException In the case of the default provider, and a security manager is installed, the {@link SecurityManager#checkRead(String)
* checkRead} method is invoked to check read access to the directory.
* @since 2.9.0
*/
public static boolean isDirectory(final Path path, final LinkOption... options) {
return path != null && Files.isDirectory(path, options);
}
/**
* Tests whether the given file or directory is empty.
*
* @param path the file or directory to query.
* @return whether the file or directory is empty.
* @throws IOException if an I/O error occurs.
*/
public static boolean isEmpty(final Path path) throws IOException {
return Files.isDirectory(path) ? isEmptyDirectory(path) : isEmptyFile(path);
}
/**
* Tests whether the directory is empty.
*
* @param directory the directory to query.
* @return whether the directory is empty.
* @throws NotDirectoryException if the file could not otherwise be opened because it is not a directory (optional specific exception).
* @throws IOException if an I/O error occurs.
* @throws SecurityException In the case of the default provider, and a security manager is installed, the {@link SecurityManager#checkRead(String)
* checkRead} method is invoked to check read access to the directory.
*/
public static boolean isEmptyDirectory(final Path directory) throws IOException {
try (DirectoryStream directoryStream = Files.newDirectoryStream(directory)) {
return !directoryStream.iterator().hasNext();
}
}
/**
* Tests whether the given file is empty.
*
* @param file the file to query.
* @return whether the file is empty.
* @throws IOException if an I/O error occurs.
* @throws SecurityException In the case of the default provider, and a security manager is installed, its {@link SecurityManager#checkRead(String)
* checkRead} method denies read access to the file.
*/
public static boolean isEmptyFile(final Path file) throws IOException {
return Files.size(file) <= 0;
}
/**
* Tests if the given {@link Path} is newer than the given time reference.
*
* @param file the {@link Path} to test.
* @param czdt the time reference.
* @param options options indicating how to handle symbolic links.
* @return true if the {@link Path} exists and has been modified after the given time reference.
* @throws IOException if an I/O error occurs.
* @throws NullPointerException if the file is {@code null}.
* @since 2.12.0
*/
public static boolean isNewer(final Path file, final ChronoZonedDateTime czdt, final LinkOption... options) throws IOException {
Objects.requireNonNull(czdt, "czdt");
return isNewer(file, czdt.toInstant(), options);
}
/**
* Tests if the given {@link Path} is newer than the given time reference.
*
* @param file the {@link Path} to test.
* @param fileTime the time reference.
* @param options options indicating how to handle symbolic links.
* @return true if the {@link Path} exists and has been modified after the given time reference.
* @throws IOException if an I/O error occurs.
* @throws NullPointerException if the file is {@code null}.
* @since 2.12.0
*/
public static boolean isNewer(final Path file, final FileTime fileTime, final LinkOption... options) throws IOException {
if (notExists(file)) {
return false;
}
return compareLastModifiedTimeTo(file, fileTime, options) > 0;
}
/**
* Tests if the given {@link Path} is newer than the given time reference.
*
* @param file the {@link Path} to test.
* @param instant the time reference.
* @param options options indicating how to handle symbolic links.
* @return true if the {@link Path} exists and has been modified after the given time reference.
* @throws IOException if an I/O error occurs.
* @throws NullPointerException if the file is {@code null}.
* @since 2.12.0
*/
public static boolean isNewer(final Path file, final Instant instant, final LinkOption... options) throws IOException {
return isNewer(file, FileTime.from(instant), options);
}
/**
* Tests if the given {@link Path} is newer than the given time reference.
*
* @param file the {@link Path} to test.
* @param timeMillis the time reference measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970)
* @param options options indicating how to handle symbolic links.
* @return true if the {@link Path} exists and has been modified after the given time reference.
* @throws IOException if an I/O error occurs.
* @throws NullPointerException if the file is {@code null}.
* @since 2.9.0
*/
public static boolean isNewer(final Path file, final long timeMillis, final LinkOption... options) throws IOException {
return isNewer(file, FileTime.fromMillis(timeMillis), options);
}
/**
* Tests if the given {@link Path} is newer than the reference {@link Path}.
*
* @param file the {@link File} to test.
* @param reference the {@link File} of which the modification date is used.
* @return true if the {@link File} exists and has been modified more recently than the reference {@link File}.
* @throws IOException if an I/O error occurs.
* @since 2.12.0
*/
public static boolean isNewer(final Path file, final Path reference) throws IOException {
return isNewer(file, getLastModifiedTime(reference));
}
/**
* Tests if the given {@link Path} is older than the given time reference.
*
* @param file the {@link Path} to test.
* @param fileTime the time reference.
* @param options options indicating how to handle symbolic links.
* @return true if the {@link Path} exists and has been modified before the given time reference.
* @throws IOException if an I/O error occurs.
* @throws NullPointerException if the file is {@code null}.
* @since 2.12.0
*/
public static boolean isOlder(final Path file, final FileTime fileTime, final LinkOption... options) throws IOException {
if (notExists(file)) {
return false;
}
return compareLastModifiedTimeTo(file, fileTime, options) < 0;
}
/**
* Tests if the given {@link Path} is older than the given time reference.
*
* @param file the {@link Path} to test.
* @param instant the time reference.
* @param options options indicating how to handle symbolic links.
* @return true if the {@link Path} exists and has been modified before the given time reference.
* @throws IOException if an I/O error occurs.
* @throws NullPointerException if the file is {@code null}.
* @since 2.12.0
*/
public static boolean isOlder(final Path file, final Instant instant, final LinkOption... options) throws IOException {
return isOlder(file, FileTime.from(instant), options);
}
/**
* Tests if the given {@link Path} is older than the given time reference.
*
* @param file the {@link Path} to test.
* @param timeMillis the time reference measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970)
* @param options options indicating how to handle symbolic links.
* @return true if the {@link Path} exists and has been modified before the given time reference.
* @throws IOException if an I/O error occurs.
* @throws NullPointerException if the file is {@code null}.
* @since 2.12.0
*/
public static boolean isOlder(final Path file, final long timeMillis, final LinkOption... options) throws IOException {
return isOlder(file, FileTime.fromMillis(timeMillis), options);
}
/**
* Tests if the given {@link Path} is older than the reference {@link Path}.
*
* @param file the {@link File} to test.
* @param reference the {@link File} of which the modification date is used.
* @return true if the {@link File} exists and has been modified before than the reference {@link File}.
* @throws IOException if an I/O error occurs.
* @since 2.12.0
*/
public static boolean isOlder(final Path file, final Path reference) throws IOException {
return isOlder(file, getLastModifiedTime(reference));
}
/**
* Tests whether the given path is on a POSIX file system.
*
* @param test The Path to test.
* @param options options indicating how to handle symbolic links.
* @return true if test is on a POSIX file system.
* @since 2.12.0
*/
public static boolean isPosix(final Path test, final LinkOption... options) {
return exists(test, options) && readPosixFileAttributes(test, options) != null;
}
/**
* Tests whether the given {@link Path} is a regular file or not. Implemented as a null-safe delegate to
* {@code Files.isRegularFile(Path path, LinkOption... options)}.
*
* @param path the path to the file.
* @param options options indicating how to handle symbolic links.
* @return {@code true} if the file is a regular file; {@code false} if the path is null, the file does not exist, is not a directory, or it cannot be
* determined if the file is a regular file or not.
* @throws SecurityException In the case of the default provider, and a security manager is installed, the {@link SecurityManager#checkRead(String)
* checkRead} method is invoked to check read access to the directory.
* @since 2.9.0
*/
public static boolean isRegularFile(final Path path, final LinkOption... options) {
return path != null && Files.isRegularFile(path, options);
}
/**
* Creates a new DirectoryStream for Paths rooted at the given directory.
*
* If you don't use the try-with-resources construct, then you must call the stream's {@link Stream#close()} method after iteration is complete to free any
* resources held for the open directory.
*
*
* @param dir the path to the directory to stream.
* @param pathFilter the directory stream filter.
* @return a new instance.
* @throws IOException if an I/O error occurs.
*/
public static DirectoryStream newDirectoryStream(final Path dir, final PathFilter pathFilter) throws IOException {
return Files.newDirectoryStream(dir, new DirectoryStreamFilter(pathFilter));
}
/**
* Creates a new OutputStream by opening or creating a file, returning an output stream that may be used to write bytes to the file.
*
* @param path the Path.
* @param append Whether or not to append.
* @return a new OutputStream.
* @throws IOException if an I/O error occurs.
* @see Files#newOutputStream(Path, OpenOption...)
* @since 2.12.0
*/
public static OutputStream newOutputStream(final Path path, final boolean append) throws IOException {
return newOutputStream(path, EMPTY_LINK_OPTION_ARRAY, append ? OPEN_OPTIONS_APPEND : OPEN_OPTIONS_TRUNCATE);
}
static OutputStream newOutputStream(final Path path, final LinkOption[] linkOptions, final OpenOption... openOptions) throws IOException {
if (!exists(path, linkOptions)) {
createParentDirectories(path, linkOptions != null && linkOptions.length > 0 ? linkOptions[0] : NULL_LINK_OPTION);
}
final List list = new ArrayList<>(Arrays.asList(openOptions != null ? openOptions : EMPTY_OPEN_OPTION_ARRAY));
list.addAll(Arrays.asList(linkOptions != null ? linkOptions : EMPTY_LINK_OPTION_ARRAY));
return Files.newOutputStream(path, list.toArray(EMPTY_OPEN_OPTION_ARRAY));
}
/**
* Copy of the {@link LinkOption} array for {@link LinkOption#NOFOLLOW_LINKS}.
*
* @return Copy of the {@link LinkOption} array for {@link LinkOption#NOFOLLOW_LINKS}.
*/
public static LinkOption[] noFollowLinkOptionArray() {
return NOFOLLOW_LINK_OPTION_ARRAY.clone();
}
private static boolean notExists(final Path path, final LinkOption... options) {
return Files.notExists(Objects.requireNonNull(path, "path"), options);
}
/**
* Returns true if the given options contain {@link StandardDeleteOption#OVERRIDE_READ_ONLY}.
*
* @param deleteOptions the array to test
* @return true if the given options contain {@link StandardDeleteOption#OVERRIDE_READ_ONLY}.
*/
private static boolean overrideReadOnly(final DeleteOption... deleteOptions) {
if (deleteOptions == null) {
return false;
}
return Stream.of(deleteOptions).anyMatch(e -> e == StandardDeleteOption.OVERRIDE_READ_ONLY);
}
/**
* Reads the BasicFileAttributes from the given path. Returns null if the attributes can't be read.
*
* @param The {@link BasicFileAttributes} type
* @param path The Path to test.
* @param type the {@link Class} of the file attributes required to read.
* @param options options indicating how to handle symbolic links.
* @return the file attributes or null if the attributes can't be read.
* @see Files#readAttributes(Path, Class, LinkOption...)
* @since 2.12.0
*/
public static A readAttributes(final Path path, final Class type, final LinkOption... options) {
try {
return path == null ? null : Files.readAttributes(path, type, options);
} catch (final UnsupportedOperationException | IOException e) {
// For example, on Windows.
return null;
}
}
/**
* Reads the BasicFileAttributes from the given path.
*
* @param path the path to read.
* @return the path attributes.
* @throws IOException if an I/O error occurs.
* @since 2.9.0
*/
public static BasicFileAttributes readBasicFileAttributes(final Path path) throws IOException {
return Files.readAttributes(path, BasicFileAttributes.class);
}
/**
* Reads the BasicFileAttributes from the given path. Returns null if the attributes can't be read.
*
* @param path the path to read.
* @param options options indicating how to handle symbolic links.
* @return the path attributes.
* @since 2.12.0
*/
public static BasicFileAttributes readBasicFileAttributes(final Path path, final LinkOption... options) {
return readAttributes(path, BasicFileAttributes.class, options);
}
/**
* Reads the BasicFileAttributes from the given path. Returns null if the attributes can't be read.
*
* @param path the path to read.
* @return the path attributes.
* @since 2.9.0
* @deprecated Use {@link #readBasicFileAttributes(Path, LinkOption...)}.
*/
@Deprecated
public static BasicFileAttributes readBasicFileAttributesUnchecked(final Path path) {
return readBasicFileAttributes(path, EMPTY_LINK_OPTION_ARRAY);
}
/**
* Reads the DosFileAttributes from the given path. Returns null if the attributes can't be read.
*
* @param path the path to read.
* @param options options indicating how to handle symbolic links.
* @return the path attributes.
* @since 2.12.0
*/
public static DosFileAttributes readDosFileAttributes(final Path path, final LinkOption... options) {
return readAttributes(path, DosFileAttributes.class, options);
}
private static Path readIfSymbolicLink(final Path path) throws IOException {
return path != null ? Files.isSymbolicLink(path) ? Files.readSymbolicLink(path) : path : null;
}
/**
* Reads the PosixFileAttributes or DosFileAttributes from the given path. Returns null if the attributes can't be read.
*
* @param path The Path to read.
* @param options options indicating how to handle symbolic links.
* @return the file attributes.
* @since 2.12.0
*/
public static BasicFileAttributes readOsFileAttributes(final Path path, final LinkOption... options) {
final PosixFileAttributes fileAttributes = readPosixFileAttributes(path, options);
return fileAttributes != null ? fileAttributes : readDosFileAttributes(path, options);
}
/**
* Reads the PosixFileAttributes from the given path. Returns null instead of throwing {@link UnsupportedOperationException}.
*
* @param path The Path to read.
* @param options options indicating how to handle symbolic links.
* @return the file attributes.
* @since 2.12.0
*/
public static PosixFileAttributes readPosixFileAttributes(final Path path, final LinkOption... options) {
return readAttributes(path, PosixFileAttributes.class, options);
}
/**
* Reads the given path as a String.
*
* @param path The source path.
* @param charset How to convert bytes to a String, null uses the default Charset.
* @return a new String.
* @throws IOException if an I/O error occurs reading from the stream.
* @see Files#readAllBytes(Path)
* @since 2.12.0
*/
public static String readString(final Path path, final Charset charset) throws IOException {
return new String(Files.readAllBytes(path), Charsets.toCharset(charset));
}
/**
* Relativizes all files in the given {@code collection} against a {@code parent}.
*
* @param collection The collection of paths to relativize.
* @param parent relativizes against this parent path.
* @param sort Whether to sort the result.
* @param comparator How to sort.
* @return A collection of relativized paths, optionally sorted.
*/
static List relativize(final Collection collection, final Path parent, final boolean sort, final Comparator comparator) {
Stream stream = collection.stream().map(parent::relativize);
if (sort) {
stream = comparator == null ? stream.sorted() : stream.sorted(comparator);
}
return stream.collect(Collectors.toList());
}
/**
* Requires that the given {@link File} exists and throws an {@link IllegalArgumentException} if it doesn't.
*
* @param file The {@link File} to check.
* @param fileParamName The parameter name to use in the exception message in case of {@code null} input.
* @param options options indicating how to handle symbolic links.
* @return the given file.
* @throws NullPointerException if the given {@link File} is {@code null}.
* @throws IllegalArgumentException if the given {@link File} does not exist.
*/
private static Path requireExists(final Path file, final String fileParamName, final LinkOption... options) {
Objects.requireNonNull(file, fileParamName);
if (!exists(file, options)) {
throw new IllegalArgumentException("File system element for parameter '" + fileParamName + "' does not exist: '" + file + "'");
}
return file;
}
private static boolean setDosReadOnly(final Path path, final boolean readOnly, final LinkOption... linkOptions) throws IOException {
final DosFileAttributeView dosFileAttributeView = getDosFileAttributeView(path, linkOptions);
if (dosFileAttributeView != null) {
dosFileAttributeView.setReadOnly(readOnly);
return true;
}
return false;
}
/**
* Sets the given {@code targetFile}'s last modified time to the value from {@code sourceFile}.
*
* @param sourceFile The source path to query.
* @param targetFile The target path to set.
* @throws NullPointerException if sourceFile is {@code null}.
* @throws NullPointerException if targetFile is {@code null}.
* @throws IOException if setting the last-modified time failed.
* @since 2.12.0
*/
public static void setLastModifiedTime(final Path sourceFile, final Path targetFile) throws IOException {
Objects.requireNonNull(sourceFile, "sourceFile");
Files.setLastModifiedTime(targetFile, getLastModifiedTime(sourceFile));
}
/**
* To delete a file in POSIX, you need Write and Execute permissions on its parent directory.
*
* @param parent The parent path for a file element to delete which needs RW permissions.
* @param enableDeleteChildren true to set permissions to delete.
* @param linkOptions options indicating how handle symbolic links.
* @return true if the operation was attempted and succeeded, false if parent is null.
* @throws IOException if an I/O error occurs.
*/
private static boolean setPosixDeletePermissions(final Path parent, final boolean enableDeleteChildren, final LinkOption... linkOptions)
throws IOException {
// To delete a file in POSIX, you need write and execute permissions on its parent directory.
// @formatter:off
return setPosixPermissions(parent, enableDeleteChildren, Arrays.asList(
PosixFilePermission.OWNER_WRITE,
//PosixFilePermission.GROUP_WRITE,
//PosixFilePermission.OTHERS_WRITE,
PosixFilePermission.OWNER_EXECUTE
//PosixFilePermission.GROUP_EXECUTE,
//PosixFilePermission.OTHERS_EXECUTE
), linkOptions);
// @formatter:on
}
/**
* Low-level POSIX permission operation to set permissions.
*
* If the permissions to update are already set, then make no additional calls.
*
*
* @param path Set this path's permissions.
* @param addPermissions true to add, false to remove.
* @param updatePermissions the List of PosixFilePermission to add or remove.
* @param linkOptions options indicating how handle symbolic links.
* @return true if the operation was attempted and succeeded, false if parent is null.
* @throws IOException if an I/O error occurs.
*/
private static boolean setPosixPermissions(final Path path, final boolean addPermissions, final List updatePermissions,
final LinkOption... linkOptions) throws IOException {
if (path != null) {
final Set permissions = Files.getPosixFilePermissions(path, linkOptions);
final Set newPermissions = new HashSet<>(permissions);
if (addPermissions) {
newPermissions.addAll(updatePermissions);
} else {
newPermissions.removeAll(updatePermissions);
}
if (!newPermissions.equals(permissions)) {
Files.setPosixFilePermissions(path, newPermissions);
}
return true;
}
return false;
}
private static void setPosixReadOnlyFile(final Path path, final boolean readOnly, final LinkOption... linkOptions) throws IOException {
// Not Windows 10
final Set permissions = Files.getPosixFilePermissions(path, linkOptions);
// @formatter:off
final List readPermissions = Arrays.asList(
PosixFilePermission.OWNER_READ
//PosixFilePermission.GROUP_READ,
//PosixFilePermission.OTHERS_READ
);
final List writePermissions = Arrays.asList(
PosixFilePermission.OWNER_WRITE
//PosixFilePermission.GROUP_WRITE,
//PosixFilePermission.OTHERS_WRITE
);
// @formatter:on
if (readOnly) {
// RO: We can read, we cannot write.
permissions.addAll(readPermissions);
permissions.removeAll(writePermissions);
} else {
// Not RO: We can read, we can write.
permissions.addAll(readPermissions);
permissions.addAll(writePermissions);
}
Files.setPosixFilePermissions(path, permissions);
}
/**
* Sets the given Path to the {@code readOnly} value.
*
* This behavior is OS dependent.
*
*
* @param path The path to set.
* @param readOnly true for read-only, false for not read-only.
* @param linkOptions options indicating how to handle symbolic links.
* @return The given path.
* @throws IOException if an I/O error occurs.
* @since 2.8.0
*/
public static Path setReadOnly(final Path path, final boolean readOnly, final LinkOption... linkOptions) throws IOException {
try {
// Windows is simplest
if (setDosReadOnly(path, readOnly, linkOptions)) {
return path;
}
} catch (final IOException ignored) {
// Retry with POSIX below.
}
final Path parent = getParent(path);
if (!isPosix(parent, linkOptions)) { // Test parent because we may not the permissions to test the file.
throw new IOException(String.format("DOS or POSIX file operations not available for '%s' %s", path, Arrays.toString(linkOptions)));
}
// POSIX
if (readOnly) {
// RO
// File, then parent dir (if any).
setPosixReadOnlyFile(path, readOnly, linkOptions);
setPosixDeletePermissions(parent, false, linkOptions);
} else {
// RE
// Parent dir (if any), then file.
setPosixDeletePermissions(parent, true, linkOptions);
}
return path;
}
/**
* Returns the size of the given file or directory. If the provided {@link Path} is a regular file, then the file's size is returned. If the argument is a
* directory, then the size of the directory is calculated recursively.
*
* Note that overflow is not detected, and the return value may be negative if overflow occurs. See {@link #sizeOfAsBigInteger(Path)} for an alternative
* method that does not overflow.
*
*
* @param path the regular file or directory to return the size of, must not be {@code null}.
* @return the length of the file, or recursive size of the directory, in bytes.
* @throws NullPointerException if the file is {@code null}.
* @throws IllegalArgumentException if the file does not exist.
* @throws IOException if an I/O error occurs.
* @since 2.12.0
*/
public static long sizeOf(final Path path) throws IOException {
requireExists(path, "path");
return Files.isDirectory(path) ? sizeOfDirectory(path) : Files.size(path);
}
/**
* Returns the size of the given file or directory. If the provided {@link Path} is a regular file, then the file's size is returned. If the argument is a
* directory, then the size of the directory is calculated recursively.
*
* @param path the regular file or directory to return the size of (must not be {@code null}).
* @return the length of the file, or recursive size of the directory, provided (in bytes).
* @throws NullPointerException if the file is {@code null}.
* @throws IllegalArgumentException if the file does not exist.
* @throws IOException if an I/O error occurs.
* @since 2.12.0
*/
public static BigInteger sizeOfAsBigInteger(final Path path) throws IOException {
requireExists(path, "path");
return Files.isDirectory(path) ? sizeOfDirectoryAsBigInteger(path) : BigInteger.valueOf(Files.size(path));
}
/**
* Counts the size of a directory recursively (sum of the size of all files).
*
* Note that overflow is not detected, and the return value may be negative if overflow occurs. See {@link #sizeOfDirectoryAsBigInteger(Path)} for an
* alternative method that does not overflow.
*
*
* @param directory directory to inspect, must not be {@code null}.
* @return size of directory in bytes, 0 if directory is security restricted, a negative number when the real total is greater than {@link Long#MAX_VALUE}.
* @throws NullPointerException if the directory is {@code null}.
* @throws IOException if an I/O error occurs.
* @since 2.12.0
*/
public static long sizeOfDirectory(final Path directory) throws IOException {
return countDirectory(directory).getByteCounter().getLong();
}
/**
* Counts the size of a directory recursively (sum of the size of all files).
*
* @param directory directory to inspect, must not be {@code null}.
* @return size of directory in bytes, 0 if directory is security restricted.
* @throws NullPointerException if the directory is {@code null}.
* @throws IOException if an I/O error occurs.
* @since 2.12.0
*/
public static BigInteger sizeOfDirectoryAsBigInteger(final Path directory) throws IOException {
return countDirectoryAsBigInteger(directory).getByteCounter().getBigInteger();
}
/**
* Converts an array of {@link FileVisitOption} to a {@link Set}.
*
* @param fileVisitOptions input array.
* @return a new Set.
*/
static Set toFileVisitOptionSet(final FileVisitOption... fileVisitOptions) {
return fileVisitOptions == null ? EnumSet.noneOf(FileVisitOption.class) : Stream.of(fileVisitOptions).collect(Collectors.toSet());
}
/**
* Implements behavior similar to the UNIX "touch" utility. Creates a new file with size 0, or, if the file exists, just updates the file's modified time.
* this method creates parent directories if they do not exist.
*
* @param file the file to touch.
* @return The given file.
* @throws NullPointerException if the parameter is {@code null}.
* @throws IOException if setting the last-modified time failed or an I/O problem occurs.\
* @since 2.12.0
*/
public static Path touch(final Path file) throws IOException {
Objects.requireNonNull(file, "file");
if (!Files.exists(file)) {
createParentDirectories(file);
Files.createFile(file);
} else {
FileTimes.setLastModifiedTime(file);
}
return file;
}
/**
* Performs {@link Files#walkFileTree(Path,FileVisitor)} and returns the given visitor.
*
* Note that {@link Files#walkFileTree(Path,FileVisitor)} returns the given path.
*
* @param visitor See {@link Files#walkFileTree(Path,FileVisitor)}.
* @param directory See {@link Files#walkFileTree(Path,FileVisitor)}.
* @param See {@link Files#walkFileTree(Path,FileVisitor)}.
* @return the given visitor.
*
* @throws NoSuchFileException if the directory does not exist.
* @throws IOException if an I/O error is thrown by a visitor method.
* @throws NullPointerException if the directory is {@code null}.
*/
public static > T visitFileTree(final T visitor, final Path directory) throws IOException {
Files.walkFileTree(directory, visitor);
return visitor;
}
/**
* Performs {@link Files#walkFileTree(Path,FileVisitor)} and returns the given visitor.
*
* Note that {@link Files#walkFileTree(Path,FileVisitor)} returns the given path.
*
* @param start See {@link Files#walkFileTree(Path,Set,int,FileVisitor)}.
* @param options See {@link Files#walkFileTree(Path,Set,int,FileVisitor)}.
* @param maxDepth See {@link Files#walkFileTree(Path,Set,int,FileVisitor)}.
* @param visitor See {@link Files#walkFileTree(Path,Set,int,FileVisitor)}.
* @param See {@link Files#walkFileTree(Path,Set,int,FileVisitor)}.
* @return the given visitor.
*
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static > T visitFileTree(final T visitor, final Path start, final Set options,
final int maxDepth) throws IOException {
Files.walkFileTree(start, options, maxDepth, visitor);
return visitor;
}
/**
* Performs {@link Files#walkFileTree(Path,FileVisitor)} and returns the given visitor.
*
* Note that {@link Files#walkFileTree(Path,FileVisitor)} returns the given path.
*
* @param visitor See {@link Files#walkFileTree(Path,FileVisitor)}.
* @param first See {@link Paths#get(String,String[])}.
* @param more See {@link Paths#get(String,String[])}.
* @param See {@link Files#walkFileTree(Path,FileVisitor)}.
* @return the given visitor.
*
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static > T visitFileTree(final T visitor, final String first, final String... more) throws IOException {
return visitFileTree(visitor, Paths.get(first, more));
}
/**
* Performs {@link Files#walkFileTree(Path,FileVisitor)} and returns the given visitor.
*
* Note that {@link Files#walkFileTree(Path,FileVisitor)} returns the given path.
*
* @param visitor See {@link Files#walkFileTree(Path,FileVisitor)}.
* @param uri See {@link Paths#get(URI)}.
* @param See {@link Files#walkFileTree(Path,FileVisitor)}.
* @return the given visitor.
*
* @throws IOException if an I/O error is thrown by a visitor method.
*/
public static > T visitFileTree(final T visitor, final URI uri) throws IOException {
return visitFileTree(visitor, Paths.get(uri));
}
/**
* Waits for the file system to propagate a file creation, with a timeout.
*
* This method repeatedly tests {@link Files#exists(Path,LinkOption...)} until it returns true up to the maximum time given.
*
*
* @param file the file to check, must not be {@code null}.
* @param timeout the maximum time to wait.
* @param options options indicating how to handle symbolic links.
* @return true if file exists.
* @throws NullPointerException if the file is {@code null}.
* @since 2.12.0
*/
public static boolean waitFor(final Path file, final Duration timeout, final LinkOption... options) {
Objects.requireNonNull(file, "file");
final Instant finishInstant = Instant.now().plus(timeout);
boolean interrupted = false;
final long minSleepMillis = 100;
try {
while (!exists(file, options)) {
final Instant now = Instant.now();
if (now.isAfter(finishInstant)) {
return false;
}
try {
ThreadUtils.sleep(Duration.ofMillis(Math.min(minSleepMillis, finishInstant.minusMillis(now.toEpochMilli()).toEpochMilli())));
} catch (final InterruptedException ignore) {
interrupted = true;
} catch (final Exception ex) {
break;
}
}
} finally {
if (interrupted) {
Thread.currentThread().interrupt();
}
}
return exists(file, options);
}
/**
* Returns a stream of filtered paths.
*
* The returned {@link Stream} may wrap one or more {@link DirectoryStream}s. When you require timely disposal of file system resources, use a
* {@code try}-with-resources block to ensure invocation of the stream's {@link Stream#close()} method after the stream operations are completed. Calling a
* closed stream causes a {@link IllegalStateException}.
*
*
* @param start the start path
* @param pathFilter the path filter
* @param maxDepth the maximum depth of directories to walk.
* @param readAttributes whether to call the filters with file attributes (false passes null).
* @param options the options to configure the walk.
* @return a filtered stream of paths.
* @throws IOException if an I/O error is thrown when accessing the starting file.
* @since 2.9.0
*/
@SuppressWarnings("resource") // Caller closes
public static Stream walk(final Path start, final PathFilter pathFilter, final int maxDepth, final boolean readAttributes,
final FileVisitOption... options) throws IOException {
return Files.walk(start, maxDepth, options)
.filter(path -> pathFilter.accept(path, readAttributes ? readBasicFileAttributesUnchecked(path) : null) == FileVisitResult.CONTINUE);
}
private static R withPosixFileAttributes(final Path path, final LinkOption[] linkOptions, final boolean overrideReadOnly,
final IOFunction function) throws IOException {
final PosixFileAttributes posixFileAttributes = overrideReadOnly ? readPosixFileAttributes(path, linkOptions) : null;
try {
return function.apply(posixFileAttributes);
} finally {
if (posixFileAttributes != null && path != null && Files.exists(path, linkOptions)) {
Files.setPosixFilePermissions(path, posixFileAttributes.permissions());
}
}
}
/**
* Writes the given character sequence to a file at the given path.
*
* @param path The target file.
* @param charSequence The character sequence text.
* @param charset The Charset to encode the text.
* @param openOptions options How to open the file.
* @return The given path.
* @throws IOException if an I/O error occurs writing to or creating the file.
* @throws NullPointerException if either {@code path} or {@code charSequence} is {@code null}.
* @since 2.12.0
*/
public static Path writeString(final Path path, final CharSequence charSequence, final Charset charset, final OpenOption... openOptions)
throws IOException {
// Check the text is not null before opening file.
Objects.requireNonNull(path, "path");
Objects.requireNonNull(charSequence, "charSequence");
Files.write(path, String.valueOf(charSequence).getBytes(Charsets.toCharset(charset)), openOptions);
return path;
}
/**
* Prevents instantiation.
*/
private PathUtils() {
// do not instantiate.
}
}