/*
 * [Encodings.java]
 *
 * Summary: Display which encodings are supported on your machine.
 *
 * Copyright: (c) 1996-2017 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:
 *  1.1 1996-01-01 add application test harness. ANT builds
 *  1.2 1996-01-01 displays the name and canonical name of the default
 *                 encoding. unfortunately, this means it must be signed.
 *  1.3 2006-03-03 soldiers on if not granted permission.
 *  1.4 2006-03-05 reformat with IntelliJ, add Javadoc.
 *  1.5 2006-03-07 convert to Swing, use layout, allow to run as Hybrid.
 *  1.6 2007-05-16 convert to JDK 1.5, add PAD, add icon.
 *  1.7 2014-12-02 add count of encoding
 */
package com.mindprod.encodings;

import com.mindprod.common18.Common18;
import com.mindprod.common18.HybridJ;
import com.mindprod.common18.VersionCheck;
import com.mindprod.fastcat.FastCat;

import javax.swing.JApplet;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import java.awt.Insets;
import java.nio.charset.Charset;
import java.security.AccessControlException;
import java.util.SortedMap;

/**
 * Display which encodings are supported on your machine.
 * <p/>
 * Displays the possible encodings available in this JVM. Nothing fancy just a list of encoding names. No about box.
 * Has to be signed to allow us to look at the default encoding.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.7 2014-12-02 add count of encodings
 * @since 1996
 */
public final class Encodings extends JApplet
    {
    // as of JDK 1.8.0_131 the following  encodings were supported
    // Big5
    // Big5-HKSCS
    // CESU-8
    // EUC-JP
    // EUC-KR
    // GB18030
    // GB2312
    // GBK
    // IBM-Thai
    // IBM00858
    // IBM01140
    // IBM01141
    // IBM01142
    // IBM01143
    // IBM01144
    // IBM01145
    // IBM01146
    // IBM01147
    // IBM01148
    // IBM01149
    // IBM037
    // IBM1026
    // IBM1047
    // IBM273
    // IBM277
    // IBM278
    // IBM280
    // IBM284
    // IBM285
    // IBM290
    // IBM297
    // IBM420
    // IBM424
    // IBM437
    // IBM500
    // IBM775
    // IBM850
    // IBM852
    // IBM855
    // IBM857
    // IBM860
    // IBM861
    // IBM862
    // IBM863
    // IBM864
    // IBM865
    // IBM866
    // IBM868
    // IBM869
    // IBM870
    // IBM871
    // IBM918
    // ISO-2022-CN
    // ISO-2022-JP
    // ISO-2022-JP-2
    // ISO-2022-KR
    // ISO-8859-1
    // ISO-8859-13
    // ISO-8859-15
    // ISO-8859-2
    // ISO-8859-3
    // ISO-8859-4
    // ISO-8859-5
    // ISO-8859-6
    // ISO-8859-7
    // ISO-8859-8
    // ISO-8859-9
    // JIS_X0201
    // JIS_X0212-1990
    // KOI8-R
    // KOI8-U
    // Shift_JIS
    // TIS-620
    // US-ASCII
    // UTF-16
    // UTF-16BE
    // UTF-16LE
    // UTF-32
    // UTF-32BE
    // UTF-32LE
    // UTF-8
    // windows-1250
    // windows-1251
    // windows-1252
    // windows-1253
    // windows-1254
    // windows-1255
    // windows-1256
    // windows-1257
    // windows-1258
    // windows-31j
    // x-Big5-HKSCS-2001
    // x-Big5-Solaris
    // x-euc-jp-linux
    // x-EUC-TW
    // x-eucJP-Open
    // x-IBM1006
    // x-IBM1025
    // x-IBM1046
    // x-IBM1097
    // x-IBM1098
    // x-IBM1112
    // x-IBM1122
    // x-IBM1123
    // x-IBM1124
    // x-IBM1364
    // x-IBM1381
    // x-IBM1383
    // x-IBM300
    // x-IBM33722
    // x-IBM737
    // x-IBM833
    // x-IBM834
    // x-IBM856
    // x-IBM874
    // x-IBM875
    // x-IBM921
    // x-IBM922
    // x-IBM930
    // x-IBM933
    // x-IBM935
    // x-IBM937
    // x-IBM939
    // x-IBM942
    // x-IBM942C
    // x-IBM943
    // x-IBM943C
    // x-IBM948
    // x-IBM949
    // x-IBM949C
    // x-IBM950
    // x-IBM964
    // x-IBM970
    // x-ISCII91
    // x-ISO-2022-CN-CNS
    // x-ISO-2022-CN-GB
    // x-iso-8859-11
    // x-JIS0208
    // x-JISAutoDetect
    // x-Johab
    // x-MacArabic
    // x-MacCentralEurope
    // x-MacCroatian
    // x-MacCyrillic
    // x-MacDingbat
    // x-MacGreek
    // x-MacHebrew
    // x-MacIceland
    // x-MacRoman
    // x-MacRomania
    // x-MacSymbol
    // x-MacThai
    // x-MacTurkish
    // x-MacUkraine
    // x-MS932_0213
    // x-MS950-HKSCS
    // x-MS950-HKSCS-XP
    // x-mswin-936
    // x-PCK
    // x-SJIS_0213
    // x-UTF-16LE-BOM
    // X-UTF-32BE-BOM
    // X-UTF-32LE-BOM
    // x-windows-50220
    // x-windows-50221
    // x-windows-874
    // x-windows-949
    // x-windows-950
    // x-windows-iso2022jp

    /**
     * height of Applet box in pixels. Does not include surrounding frame.
     */
    private static final int APPLET_HEIGHT = 720;

    /**
     * Width of Applet box in pixels.
     */
    private static final int APPLET_WIDTH = 180;

    private static final int FIRST_COPYRIGHT_YEAR = 1996;

    /**
     * max length of an encoding name
     */
    private static final int MAX_LINE_LENGTH = "x-windows-iso2022jp".length();

    /**
     * undisplayed copyright notice
     */
    @SuppressWarnings( { "UnusedDeclaration" } )
    private static final String EMBEDDED_COPYRIGHT =
            "Copyright: (c) 1996-2017 Roedy Green, Canadian Mind Products, http://mindprod.com";

    @SuppressWarnings( { "UnusedDeclaration" } )
    private static final String RELEASE_DATE = "2014-12-02";

    @SuppressWarnings( { "UnusedDeclaration" } )
    private static final String TITLE_STRING = "Encodings";

    @SuppressWarnings( { "UnusedDeclaration" } )
    private static final String VERSION_STRING = "1.7";

    private void buildComponents()
        {
        final SortedMap<String, Charset> sm = Charset.availableCharsets();
        final int size = sm.size();
        final FastCat sb = new FastCat( size * 2 + 8 );
        // Charset.defaultCharset().name(); JDK 1.5+
        // will trigger security violation in unsigned Applet,
        // since it too does a System.getProperty( "file.encoding" );
        sb.append( TITLE_STRING
                   + " "
                   + VERSION_STRING
                   + "\n"
                   + size
                   + "\n"
                   + "SUPPORTED\n"
                   + "ENCODINGS" );
        sb.append( "\n------\n" );
        try
            {
            String defaultEncoding = System.getProperty( "file.encoding" );
            String canonicalName = Charset.forName( defaultEncoding ).name();
            sb.append( "default:\n" );
            sb.append( defaultEncoding );
            sb.append( "\nofficially:\n" );
            sb.append( canonicalName );
            }
        catch ( AccessControlException e )
            {
            sb.append( "No permission\n"
                       + "granted\n"
                       + "to view\n"
                       + "the default\n"
                       + "encoding" );
            }
        sb.append( "\n------\n" );
        for ( String key : sm.keySet() )
            {
            sb.append( key );
            sb.append( '\n' );
            }
        JTextArea encodingList =
                new JTextArea( sb.toString(), size, MAX_LINE_LENGTH );
        encodingList.setMargin( new Insets( 2, 2, 2, 0 ) );
        JScrollPane sp =
                new JScrollPane( encodingList,
                        JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                        JScrollPane.HORIZONTAL_SCROLLBAR_NEVER );
        add( sp );
        }

    /**
     * Allow this Applet to run as an application as well.
     *
     * @param args command line arguments ignored.
     */
    public static void main( String args[] )
        {
        HybridJ.fireup( new Encodings(),
                "Enc"
                /* too narrow for usual title */,
                APPLET_WIDTH,
                APPLET_HEIGHT );
        } // end main

    /**
     * Called by the browser or Applet viewer to inform
     * this Applet that it is being reclaimed and that it should destroy
     * any resources that it has allocated.
     */
    public void destroy()
        {
        // no object variables
        }

    /**
     * Called by the browser or Applet viewer to inform
     * this Applet that it has been loaded into the system.
     */
    @Override
    public void init()
        {
        if ( !VersionCheck.isJavaVersionOK( 1, 8, 0, this ) )
            {
            return;
            }
        Common18.setLaf();
        buildComponents();
        this.validate();
        setVisible( true );
        }
    }