/*
 * [JarLook.java]
 *
 * Summary: Display a sorted list of files inside a jar with package names.
 *
 * Copyright: (c) 2006-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  1.0 2006-01-16 initial version
 *  1.1 2006-01-16
 *  1.2 2006-03-06 reformat with IntelliJ, add Javadoc
 */
package com.mindprod.jarlook;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import static java.lang.System.*;

/**
 * Display a sorted list of files inside a jar with package names.
 * <p/>
 * Also works on zip created with Java, e.g. ANT zip.
 * Display uses / in package names.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.2 2006-03-06
 * @since 2006-01-16
 */
public final class JarLook
    {
    private static final int FIRST_COPYRIGHT_YEAR = 2006;

    /**
     * undisplayed copyright notice
     */
    private static final String EMBEDDED_COPYRIGHT =
            "Copyright: (c) 2006-2017 Roedy Green, Canadian Mind Products, http://mindprod.com";

    private static final String RELEASE_DATE = "2006-03-06";

    private static final String USAGE = "\njava.exe  -jar jarlook.jar  jartoexamine.jar";

    /**
     * embedded version string.
     */
    private static final String VERSION_STRING = "1.2";

    /**
     * Main reads jar and display sorted list of files in it.
     *
     * @param args jar name to display.
     */
    public static void main( String[] args )
        {
        if ( args.length != 1 )
            {
            err.println( USAGE );
            System.exit( 1 );
            }
        ArrayList<String> names = new ArrayList<>( 100 );
        String jarFile = args[ 0 ];
        ZipFile zip = null;
        try
            {
            // O P E N
            zip = new ZipFile( new File( jarFile ), ZipFile.OPEN_READ );
            }
        catch ( IOException e )
            {
            err.println( "Problems opening file " + args[ 0 ] );
            System.exit( 1 );
            }
        try
            {
            // R E A D
            // for each entry in jar
            // can't use for:each, only works with Iterator not Enumeration.
            for ( Enumeration e = zip.entries(); e.hasMoreElements(); )
                {
                ZipEntry entry = ( ZipEntry ) e.nextElement();
                names.add( entry.getName() );
                } // end for
            // C L O S E
            zip.close();
            }
        catch ( IOException e )
            {
            err.println( "Problems processing file " + args[ 0 ] );
            System.exit( 1 );
            }
        // S O R T
        // case-sensitive alpha sort
        Collections.sort( names );
        // D I S P L A Y
        for ( String name : names )
            {
            out.println( name );
            }
        } // end main
    } // end JarLook