AlbiteCharacterDecoder.java

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package org.albite.io.decoders;

import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

/**
 *
 * @author albus
 */
abstract class AlbiteCharacterDecoder {

    public static final int     DECODING_DONE       = -1;

    /**
     * Used as a substitute, if there is a char that couldn't be read
     * right.
     */
    public static final char    SUBSTITUTE_CHAR     = '?';

    public abstract int decode(InputStream in) throws IOException;

    public static AlbiteCharacterDecoder getDecoder(final String encoding)
            throws UnsupportedEncodingException {

        //#if !(TinyMode || TinyModeExport)
        /*
         * ASCII
         */
        if (match(encoding, Encodings.ASCII_ALIASES)) {
            return DecoderASCII.getInstance();
        }
        //#endif

        /*
         * UTF-8
         */
        if (match(encoding, Encodings.UTF_8_ALIASES)) {
            return DecoderUTF_8.getInstance();
        }

        /*
         * ISO-8859-X
         */
        if (match(encoding, Encodings.ISO_8859_1_ALIASES)) {
            return DecoderISO_8859_1.getInstance();
        }

        //#if !(TinyMode || TinyModeExport)
        if (match(encoding, Encodings.ISO_8859_2_ALIASES)) {
            return DecoderISO_8859_2.getInstance();
        }

        if (match(encoding, Encodings.ISO_8859_3_ALIASES)) {
            return DecoderISO_8859_3.getInstance();
        }

        if (match(encoding, Encodings.ISO_8859_4_ALIASES)) {
            return DecoderISO_8859_4.getInstance();
        }

        if (match(encoding, Encodings.ISO_8859_5_ALIASES)) {
            return DecoderISO_8859_5.getInstance();
        }

        if (match(encoding, Encodings.ISO_8859_7_ALIASES)) {
            return DecoderISO_8859_7.getInstance();
        }

        if (match(encoding, Encodings.ISO_8859_9_ALIASES)) {
            return DecoderISO_8859_9.getInstance();
        }

        if (match(encoding, Encodings.ISO_8859_10_ALIASES)) {
            return DecoderISO_8859_10.getInstance();
        }

        if (match(encoding, Encodings.ISO_8859_13_ALIASES)) {
            return DecoderISO_8859_13.getInstance();
        }

        if (match(encoding, Encodings.ISO_8859_14_ALIASES)) {
            return DecoderISO_8859_14.getInstance();
        }

        if (match(encoding, Encodings.ISO_8859_15_ALIASES)) {
            return DecoderISO_8859_15.getInstance();
        }

        if (match(encoding, Encodings.ISO_8859_16_ALIASES)) {
            return DecoderISO_8859_16.getInstance();
        }
        //#endif

        /*
         * Windows
         */
        if (match(encoding, Encodings.WINDOWS_1250_ALIASES)) {
            return DecoderWindows_1250.getInstance();
        }

        //#if !(TinyMode || TinyModeExport)
        if (match(encoding, Encodings.WINDOWS_1251_ALIASES)) {
            return DecoderWindows_1251.getInstance();
        }

        if (match(encoding, Encodings.WINDOWS_1252_ALIASES)) {
            return DecoderWindows_1252.getInstance();
        }

        if (match(encoding, Encodings.WINDOWS_1253_ALIASES)) {
            return DecoderWindows_1253.getInstance();
        }

        if (match(encoding, Encodings.WINDOWS_1254_ALIASES)) {
            return DecoderWindows_1254.getInstance();
        }

        if (match(encoding, Encodings.WINDOWS_1257_ALIASES)) {
            return DecoderWindows_1257.getInstance();
        }

        /*
         * KOI8
         */
        if (match(encoding, Encodings.KOI8_R_ALIASES)) {
            return DecoderKOI8_R.getInstance();
        }

        if (match(encoding, Encodings.KOI8_RU_ALIASES)) {
            return DecoderKOI8_RU.getInstance();
        }

        if (match(encoding, Encodings.KOI8_U_ALIASES)) {
            return DecoderKOI8_U.getInstance();
        }
        //#endif

        throw new UnsupportedEncodingException();
    }

    private static boolean match(final String name, final String[] aliases) {
        for (int i = 0; i < aliases.length; i++) {
            if (aliases[i].equalsIgnoreCase(name)) {
                return true;
            }
        }

        return false;
    }

    public static boolean decoderAvailable(final String encoding) {
        for (int i = 0; i < Encodings.ALIASES.length; i++) {
            if (match(encoding, Encodings.ALIASES[i])) {
                return true;
            }
        }

        return false;
    }

    public abstract String getEncoding();
}