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Apache Commons Compress 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.
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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.compress.archivers.sevenz;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class CLI {

    private static final byte[] BUF = new byte[8192];

    private static enum Mode {
        LIST("Analysing") {
            @Override
            public void takeAction(SevenZFile archive, SevenZArchiveEntry entry) {
                System.out.print(entry.getName());
                if (entry.isDirectory()) {
                    System.out.print(" dir");
                } else {
                    System.out.print(" " + entry.getCompressedSize()
                                     + "/" + entry.getSize());
                }
                if (entry.getHasLastModifiedDate()) {
                    System.out.print(" " + entry.getLastModifiedDate());
                } else {
                    System.out.print(" no last modified date");
                }
                if (!entry.isDirectory()) {
                    System.out.println(" " + getContentMethods(entry));
                } else {
                    System.out.println("");
                }
            }

            private String getContentMethods(SevenZArchiveEntry entry) {
                StringBuilder sb = new StringBuilder();
                boolean first = true;
                for (SevenZMethodConfiguration m : entry.getContentMethods()) {
                    if (!first) {
                        sb.append(", ");
                    }
                    first = false;
                    sb.append(m.getMethod());
                    if (m.getOptions() != null) {
                        sb.append("(" + m.getOptions() + ")");
                    }
                }
                return sb.toString();
            }
        },
        EXTRACT("Extracting") {
            @Override
            public void takeAction(SevenZFile archive, SevenZArchiveEntry entry) 
                throws IOException {
                File outFile = new File(entry.getName());
                if (entry.isDirectory()) {
                    if (!outFile.isDirectory() && !outFile.mkdirs()) {
                        throw new IOException("Cannot create directory " + outFile);
                    }
                    System.out.println("created directory " + outFile);
                    return;
                }

                System.out.println("extracting to " + outFile);
                File parent = outFile.getParentFile();
                if (parent != null && !parent.exists() && !parent.mkdirs()) {
                    throw new IOException("Cannot create " + parent);
                }
                FileOutputStream fos = new FileOutputStream(outFile);
                try {
                    final long total = entry.getSize();
                    long off = 0;
                    while (off < total) {
                        int toRead = (int) Math.min(total - off, BUF.length);
                        int bytesRead = archive.read(BUF, 0, toRead);
                        if (bytesRead < 1) {
                            throw new IOException("reached end of entry "
                                                  + entry.getName()
                                                  + " after " + off
                                                  + " bytes, expected "
                                                  + total);
                        }
                        off += bytesRead;
                        fos.write(BUF, 0, bytesRead);
                    }
                } finally {
                    fos.close();
                }
            }
        };

        private final String message;
        private Mode(String message) {
            this.message = message;
        }
        public String getMessage() {
            return message;
        }
        public abstract void takeAction(SevenZFile archive, SevenZArchiveEntry entry)
            throws IOException;
    }        

    public static void main(String[] args) throws Exception {
        if (args.length == 0) {
            usage();
            return;
        }
        Mode mode = grabMode(args);
        System.out.println(mode.getMessage() + " " + args[0]);
        File f = new File(args[0]);
        if (!f.isFile()) {
            System.err.println(f + " doesn't exist or is a directory");
        }
        SevenZFile archive = new SevenZFile(f);
        try {
            SevenZArchiveEntry ae;
            while((ae=archive.getNextEntry()) != null) {
                mode.takeAction(archive, ae);
            }
        } finally {
            archive.close();
        }
    }

    private static void usage() {
        System.out.println("Parameters: archive-name [list|extract]");
    }

    private static Mode grabMode(String[] args) {
        if (args.length < 2) {
            return Mode.LIST;
        }
        return Enum.valueOf(Mode.class, args[1].toUpperCase());
    }

}