/*
 * [DetectNewEncodings.java]
 *
 * Summary: Detect encodings newly supported in this Java release.
 *
 * Copyright: (c) 2015-2017 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 2015-10-18 initial version
 */
package com.mindprod.encodings;

import com.mindprod.csv.CSVReader;

import java.io.EOFException;
import java.io.FileReader;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.HashSet;
import java.util.SortedMap;

import static java.lang.System.*;

/**
 * Detect encodings newly supported in this Java release.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.0 2015-10-18 initial version
 * @since 2015-10-18
 */
public final class DetectNewEncodings
    {
    private static HashSet<String> knownEncodings = new HashSet<String>( 250 );

    /**
     * load up the list of encodings we already know about
     */
    private static void getKnownEncodings() throws IOException
        {
        // strip comments
        CSVReader r = new CSVReader( new FileReader( "E:/com/mindprod/encodings/all.csv" ) );
        try
            {
            while ( true )
                {
                final String encoding = r.get();
                r.skipToNextLine();
                knownEncodings.add( encoding );
                }
            }
        catch ( EOFException e )
            {
            }
        }

    /**
     * Detect encodings newly supported in this Java release.
     * all.csv has encodings we already know about
     *
     * @param args command line arguments ignored.
     */
    public static void main( String args[] ) throws IOException
        {
        getKnownEncodings();
        SortedMap<String, Charset> newEncodings = Charset.availableCharsets();
        for ( String newEncoding : newEncodings.keySet() )
            {
            if ( !knownEncodings.contains( newEncoding ) )
                {
                out.println( "NEW ENCODING: " + newEncoding );
                }
            }
        } // end main
    }