001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     *
017     */
018    
019    package org.apache.commons.compress.archivers;
020    
021    import java.io.BufferedInputStream;
022    import java.io.File;
023    import java.io.FileInputStream;
024    import java.io.InputStream;
025    
026    import org.apache.commons.compress.archivers.ArchiveEntry;
027    import org.apache.commons.compress.archivers.ArchiveInputStream;
028    import org.apache.commons.compress.archivers.ArchiveStreamFactory;
029    
030    /**
031     * Simple command line application that lists the contents of an archive.
032     *
033     * <p>The name of the archive must be given as a command line argument.</p>
034     * <p>The optional second argument defines the archive type, in case the format is not recognised.</p>
035     *
036     * @since Apache Commons Compress 1.1
037     */
038    public final class Lister {
039        private static final ArchiveStreamFactory factory = new ArchiveStreamFactory();
040        
041        public static void main(String[] args) throws Exception {
042            if (args.length == 0) {
043                usage();
044                return;
045            }
046            System.out.println("Analysing "+args[0]);
047            File f = new File(args[0]);
048            if (!f.isFile()) {
049                System.err.println(f + " doesn't exist or is a directory");
050            }
051            InputStream fis = new BufferedInputStream(new FileInputStream(f));
052            ArchiveInputStream ais;
053            if (args.length > 1) {
054                ais = factory.createArchiveInputStream(args[1], fis);
055            } else {
056                ais = factory.createArchiveInputStream(fis);
057            }
058            System.out.println("Created "+ais.toString());
059            ArchiveEntry ae;
060            while((ae=ais.getNextEntry()) != null){
061                System.out.println(ae.getName());
062            }
063            ais.close();
064            fis.close();
065        }
066    
067        private static void usage() {
068            System.out.println("Parameters: archive-name [archive-type]");
069            
070        }
071    
072    }