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Apache Commons Compress software defines an API for working with
compression and archive formats. These include: bzip2, gzip, pack200,
lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4,
Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
/*
* 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.compress.archivers.examples;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.FileVisitOption;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.EnumSet;
import java.util.Objects;
import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.ArchiveException;
import org.apache.commons.compress.archivers.ArchiveOutputStream;
import org.apache.commons.compress.archivers.ArchiveStreamFactory;
import org.apache.commons.compress.archivers.sevenz.SevenZOutputFile;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
import org.apache.commons.compress.utils.IOUtils;
/**
* Provides a high level API for creating archives.
*
* @since 1.17
* @since 1.21 Supports {@link Path}.
*/
public class Archiver {
private static class ArchiverFileVisitor extends SimpleFileVisitor {
private final ArchiveOutputStream target;
private final Path directory;
private final LinkOption[] linkOptions;
private ArchiverFileVisitor(final ArchiveOutputStream target, final Path directory,
final LinkOption... linkOptions) {
this.target = target;
this.directory = directory;
this.linkOptions = linkOptions == null ? IOUtils.EMPTY_LINK_OPTIONS : linkOptions.clone();
}
@Override
public FileVisitResult preVisitDirectory(final Path dir, final BasicFileAttributes attrs) throws IOException {
return visit(dir, attrs, false);
}
protected FileVisitResult visit(final Path path, final BasicFileAttributes attrs, final boolean isFile)
throws IOException {
Objects.requireNonNull(path);
Objects.requireNonNull(attrs);
final String name = directory.relativize(path).toString().replace('\\', '/');
if (!name.isEmpty()) {
final ArchiveEntry archiveEntry = target.createArchiveEntry(path,
isFile || name.endsWith("/") ? name : name + "/", linkOptions);
target.putArchiveEntry(archiveEntry);
if (isFile) {
// Refactor this as a BiConsumer on Java 8
Files.copy(path, target);
}
target.closeArchiveEntry();
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
return visit(file, attrs, true);
}
}
/**
* No {@link FileVisitOption}.
*/
public static final EnumSet EMPTY_FileVisitOption = EnumSet.noneOf(FileVisitOption.class);
/**
* Creates an archive {@code target} by recursively including all files and directories in {@code directory}.
*
* @param target the stream to write the new archive to.
* @param directory the directory that contains the files to archive.
* @throws IOException if an I/O error occurs
*/
public void create(final ArchiveOutputStream target, final File directory) throws IOException {
create(target, directory.toPath(), EMPTY_FileVisitOption);
}
/**
* Creates an archive {@code target} by recursively including all files and directories in {@code directory}.
*
* @param target the stream to write the new archive to.
* @param directory the directory that contains the files to archive.
* @throws IOException if an I/O error occurs or the archive cannot be created for other reasons.
* @since 1.21
*/
public void create(final ArchiveOutputStream target, final Path directory) throws IOException {
create(target, directory, EMPTY_FileVisitOption);
}
/**
* Creates an archive {@code target} by recursively including all files and directories in {@code directory}.
*
* @param target the stream to write the new archive to.
* @param directory the directory that contains the files to archive.
* @param fileVisitOptions linkOptions to configure the traversal of the source {@code directory}.
* @param linkOptions indicating how symbolic links are handled.
* @throws IOException if an I/O error occurs or the archive cannot be created for other reasons.
* @since 1.21
*/
public void create(final ArchiveOutputStream target, final Path directory,
final EnumSet fileVisitOptions, final LinkOption... linkOptions) throws IOException {
Files.walkFileTree(directory, fileVisitOptions, Integer.MAX_VALUE,
new ArchiverFileVisitor(target, directory, linkOptions));
target.finish();
}
/**
* Creates an archive {@code target} by recursively including all files and directories in {@code directory}.
*
* @param target the file to write the new archive to.
* @param directory the directory that contains the files to archive.
* @throws IOException if an I/O error occurs
*/
public void create(final SevenZOutputFile target, final File directory) throws IOException {
create(target, directory.toPath());
}
/**
* Creates an archive {@code target} by recursively including all files and directories in {@code directory}.
*
* @param target the file to write the new archive to.
* @param directory the directory that contains the files to archive.
* @throws IOException if an I/O error occurs
* @since 1.21
*/
public void create(final SevenZOutputFile target, final Path directory) throws IOException {
// This custom SimpleFileVisitor goes away with Java 8's BiConsumer.
Files.walkFileTree(directory, new ArchiverFileVisitor(null, directory) {
@Override
protected FileVisitResult visit(final Path path, final BasicFileAttributes attrs, final boolean isFile)
throws IOException {
Objects.requireNonNull(path);
Objects.requireNonNull(attrs);
final String name = directory.relativize(path).toString().replace('\\', '/');
if (!name.isEmpty()) {
final ArchiveEntry archiveEntry = target.createArchiveEntry(path,
isFile || name.endsWith("/") ? name : name + "/");
target.putArchiveEntry(archiveEntry);
if (isFile) {
// Refactor this as a BiConsumer on Java 8
target.write(path);
}
target.closeArchiveEntry();
}
return FileVisitResult.CONTINUE;
}
});
target.finish();
}
/**
* Creates an archive {@code target} using the format {@code
* format} by recursively including all files and directories in {@code directory}.
*
* @param format the archive format. This uses the same format as accepted by {@link ArchiveStreamFactory}.
* @param target the file to write the new archive to.
* @param directory the directory that contains the files to archive.
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be created for other reasons
*/
public void create(final String format, final File target, final File directory)
throws IOException, ArchiveException {
create(format, target.toPath(), directory.toPath());
}
/**
* Creates an archive {@code target} using the format {@code
* format} by recursively including all files and directories in {@code directory}.
*
*
* This method creates a wrapper around the target stream which is never closed and thus leaks resources, please use
* {@link #create(String,OutputStream,File,CloseableConsumer)} instead.
*
*
* @param format the archive format. This uses the same format as accepted by {@link ArchiveStreamFactory}.
* @param target the stream to write the new archive to.
* @param directory the directory that contains the files to archive.
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be created for other reasons
* @deprecated this method leaks resources
*/
@Deprecated
public void create(final String format, final OutputStream target, final File directory)
throws IOException, ArchiveException {
create(format, target, directory, CloseableConsumer.NULL_CONSUMER);
}
/**
* Creates an archive {@code target} using the format {@code
* format} by recursively including all files and directories in {@code directory}.
*
*
* This method creates a wrapper around the archive stream and the caller of this method is responsible for closing
* it - probably at the same time as closing the stream itself. The caller is informed about the wrapper object via
* the {@code
* closeableConsumer} callback as soon as it is no longer needed by this class.
*
*
* @param format the archive format. This uses the same format as accepted by {@link ArchiveStreamFactory}.
* @param target the stream to write the new archive to.
* @param directory the directory that contains the files to archive.
* @param closeableConsumer is informed about the stream wrapped around the passed in stream
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be created for other reasons
* @since 1.19
*/
public void create(final String format, final OutputStream target, final File directory,
final CloseableConsumer closeableConsumer) throws IOException, ArchiveException {
try (CloseableConsumerAdapter c = new CloseableConsumerAdapter(closeableConsumer)) {
create(c.track(ArchiveStreamFactory.DEFAULT.createArchiveOutputStream(format, target)), directory);
}
}
/**
* Creates an archive {@code target} using the format {@code
* format} by recursively including all files and directories in {@code directory}.
*
* @param format the archive format. This uses the same format as accepted by {@link ArchiveStreamFactory}.
* @param target the file to write the new archive to.
* @param directory the directory that contains the files to archive.
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be created for other reasons
* @since 1.21
*/
public void create(final String format, final Path target, final Path directory)
throws IOException, ArchiveException {
if (prefersSeekableByteChannel(format)) {
try (SeekableByteChannel channel = FileChannel.open(target, StandardOpenOption.WRITE,
StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING)) {
create(format, channel, directory);
return;
}
}
try (@SuppressWarnings("resource") // ArchiveOutputStream wraps newOutputStream result
ArchiveOutputStream outputStream = ArchiveStreamFactory.DEFAULT.createArchiveOutputStream(format,
Files.newOutputStream(target))) {
create(outputStream, directory, EMPTY_FileVisitOption);
}
}
/**
* Creates an archive {@code target} using the format {@code
* format} by recursively including all files and directories in {@code directory}.
*
*
* This method creates a wrapper around the target channel which is never closed and thus leaks resources, please
* use {@link #create(String,SeekableByteChannel,File,CloseableConsumer)} instead.
*
*
* @param format the archive format. This uses the same format as accepted by {@link ArchiveStreamFactory}.
* @param target the channel to write the new archive to.
* @param directory the directory that contains the files to archive.
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be created for other reasons
* @deprecated this method leaks resources
*/
@Deprecated
public void create(final String format, final SeekableByteChannel target, final File directory)
throws IOException, ArchiveException {
create(format, target, directory, CloseableConsumer.NULL_CONSUMER);
}
/**
* Creates an archive {@code target} using the format {@code
* format} by recursively including all files and directories in {@code directory}.
*
*
* This method creates a wrapper around the archive channel and the caller of this method is responsible for closing
* it - probably at the same time as closing the channel itself. The caller is informed about the wrapper object via
* the {@code
* closeableConsumer} callback as soon as it is no longer needed by this class.
*
*
* @param format the archive format. This uses the same format as accepted by {@link ArchiveStreamFactory}.
* @param target the channel to write the new archive to.
* @param directory the directory that contains the files to archive.
* @param closeableConsumer is informed about the stream wrapped around the passed in stream
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be created for other reasons
* @since 1.19
*/
public void create(final String format, final SeekableByteChannel target, final File directory,
final CloseableConsumer closeableConsumer) throws IOException, ArchiveException {
try (CloseableConsumerAdapter c = new CloseableConsumerAdapter(closeableConsumer)) {
if (!prefersSeekableByteChannel(format)) {
create(format, c.track(Channels.newOutputStream(target)), directory);
} else if (ArchiveStreamFactory.ZIP.equalsIgnoreCase(format)) {
create(c.track(new ZipArchiveOutputStream(target)), directory);
} else if (ArchiveStreamFactory.SEVEN_Z.equalsIgnoreCase(format)) {
create(c.track(new SevenZOutputFile(target)), directory);
} else {
// never reached as prefersSeekableByteChannel only returns true for ZIP and 7z
throw new ArchiveException("Don't know how to handle format " + format);
}
}
}
/**
* Creates an archive {@code target} using the format {@code
* format} by recursively including all files and directories in {@code directory}.
*
* @param format the archive format. This uses the same format as accepted by {@link ArchiveStreamFactory}.
* @param target the channel to write the new archive to.
* @param directory the directory that contains the files to archive.
* @throws IOException if an I/O error occurs
* @throws IllegalStateException if the format does not support {@code SeekableByteChannel}.
*/
public void create(final String format, final SeekableByteChannel target, final Path directory) throws IOException {
if (ArchiveStreamFactory.SEVEN_Z.equalsIgnoreCase(format)) {
try (SevenZOutputFile sevenZFile = new SevenZOutputFile(target)) {
create(sevenZFile, directory);
}
} else if (ArchiveStreamFactory.ZIP.equalsIgnoreCase(format)) {
try (ArchiveOutputStream archiveOutputStream = new ZipArchiveOutputStream(target)) {
create(archiveOutputStream, directory, EMPTY_FileVisitOption);
}
} else {
throw new IllegalStateException(format);
}
}
private boolean prefersSeekableByteChannel(final String format) {
return ArchiveStreamFactory.ZIP.equalsIgnoreCase(format)
|| ArchiveStreamFactory.SEVEN_Z.equalsIgnoreCase(format);
}
}