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Spi of i18n system

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package io.ultreia.java4all.i18n.spi;

/*-
 * #%L
 * I18n :: Spi
 * %%
 * Copyright (C) 2018 Code Lutin, Ultreia.io
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 *
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.util.Collections;
import java.util.Date;
import java.util.Enumeration;
import java.util.List;
import java.util.Properties;
import java.util.Vector;

/**
 * Extend {@link Properties} to allow alphabetical order.
 * Encoding could also be defined but you must use this class only with Java 1.6.
 * 

 * Created by tchemit on 06/11/2018.
 *
 * @author Tony Chemit - [email protected]
 */
@SuppressWarnings("WeakerAccess")
public class I18nProperties extends Properties {

    private static final String ENCODING_DEFAULT = "8859_1";
    private static final String ENCODING_LATIN1 = "iso-8859-1";
    private static final String ENCODING_ASCII = "us-ascii";

    private static final long serialVersionUID = -1147150444452577558L;
    /** A table of hex digits in upper case */
    private static final char[] hexDigitUpper = {
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
    };

    /** A table of hex digits in lower case */
    private static final char[] hexDigitLower = {
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
    };
    /**
     * A flag to write unicode using the a lower letter.
     * 

     * Example : {@code \u00e9} instead of {@code \u00E9}.
     */
    private final boolean unicodeLower;
    private final char[] hexDigit;
    /** l'encoding par defaut a utiliser pour lire et ecrire le properties. */
    private String defaultEncoding;
    /** un drapeau pour savoir s'il faut enlever l'entete generere */
    private boolean removeHeader;

    public I18nProperties() {
        this(ENCODING_DEFAULT);
    }

    public I18nProperties(String defaultEncoding) {
        this(defaultEncoding, true, false);
    }

    public I18nProperties(String defaultEncoding, boolean removeHeader) {
        this(defaultEncoding, removeHeader, false);
    }

    public I18nProperties(String defaultEncoding, boolean removeHeader, boolean unicodeLower) {
        this.defaultEncoding = defaultEncoding;
        this.removeHeader = removeHeader;
        this.unicodeLower = unicodeLower;
        hexDigit = unicodeLower ? hexDigitLower : hexDigitUpper;
    }

    public I18nProperties(Properties defaults) {
        super(defaults);
        defaultEncoding = ENCODING_DEFAULT;
        unicodeLower = false;
        hexDigit = hexDigitUpper;
    }

    @Override
    public Enumeration keys() {
        List objects = Collections.list(super.keys());
        Vector result;
        try {
            // Attention, si les clef ne sont pas des string, ca ne marchera pas
            @SuppressWarnings("unchecked") List list = (List) objects;
            Collections.sort(list);
            result = new Vector<>(list);
        } catch (IllegalArgumentException e) {
            // keys are not string !!!
            // can not sort keys
            result = new Vector<>(objects);
        }
        return result.elements();
    }

    /**
     * Load all properties from given {@code src} file using defined {@code defaultEncoding}.
     *
     * @param src source file
     * @return this instance
     * @throws IOException if any io pb
     * @see #load(File, String)
     */
    public I18nProperties load(File src) throws IOException {
        return load(src, defaultEncoding);
    }

    /**
     * Load Properties from {@code src} file using given {@code defaultEncoding}.
     * If this {@code encoding} is different from default ones
     * {@link #ENCODING_DEFAULT}, {@link #ENCODING_LATIN1}
     * and {@link #ENCODING_ASCII}. A specific {@link Reader} will
     * be used to read the file.
     *
     * @param src      File where Properties will be loaded
     * @param encoding Encoding to use
     * @return this instance
     * @throws IOException for any file errors
     * @since 1.3
     */
    public I18nProperties load(File src, String encoding) throws IOException {
        try (Reader reader = new InputStreamReader(new FileInputStream(src), encoding)) {
            load(reader);
        }
        return this;
    }

    /**
     * Save properties in given {@code dst} file using defined {@code defaultEncoding}.
     *
     * @param dst output file
     * @throws IOException if any io pb
     * @see #store(File, String)
     */
    public void store(File dst) throws IOException {
        store(dst, defaultEncoding);
    }

    /**
     * Store Properties in {@code output} file using given {@code defaultEncoding}.
     * If this {@code encoding} is different from default ones
     * {@link #ENCODING_DEFAULT}, {@link #ENCODING_LATIN1}
     * and {@link #ENCODING_ASCII}, a specific {@link Writer} will
     * be used to save the file. Otherwise the default Properties behavior
     * will escape unicode chars with \uxxxx.
     *
     * @param dst      File to save Properties
     * @param encoding Encoding to use
     * @throws IOException for any file errors
     * @since 1.3
     */
    public void store(File dst, String encoding) throws IOException {
        try (OutputStream stream = new FileOutputStream(dst)) {
            storeEncode(stream, encoding);
        }
    }

    /**
     * If encoding is not the default Properties one, we will use a writer
     * to use this custom encoding.
     * 

     * We must call the right method depends on encoding, for a custom one
     * the {@link #store(Writer, String)} method is used otherwise the
     * default encoding 8859_1 must be used as superclass define it in
     * {@link #store(OutputStream, String)}.
     * 

     * Encoding {@link #ENCODING_DEFAULT},
     * {@link #ENCODING_LATIN1} and {@link #ENCODING_ASCII}
     * are considered as default Properties one, so the old method will be use
     * escaping unicode chars like \uxxxx.
     *
     * @param stream   OutputStream to save in
     * @param encoding Encoding to use
     * @throws IOException For any file errors
     */
    protected void storeEncode(OutputStream stream, String encoding) throws IOException {

        // Specific encoding different from default ones
        if (!ENCODING_LATIN1.equalsIgnoreCase(encoding) &&
                !ENCODING_DEFAULT.equals(encoding) &&
                !ENCODING_ASCII.equalsIgnoreCase(encoding)) {

            try (Writer writer = new OutputStreamWriter(stream, encoding)) {
                store(writer, null);
            }

        } else {

            store(stream, null);
        }
    }

    /**
     * Save properties in given {@code stream} file. {@code defaultEncoding} defined
     * will be ignored to store the properties file. The default encoding is the
     * basic Properties one (Latin1 ISO), unicode chars will be escaped
     * like basic {@link #store(OutputStream, String)} method.
     *
     * @param dst output file
     * @throws IOException if any io pb
     */
    public void store(OutputStream dst) throws IOException {
        store(dst, null);
    }

    @Override
    public void store(OutputStream out, String comments)
            throws IOException {

        // Keep same implementation as super Properties class. Even if the
        // encoding is modified, the resulting file always be an ASCII one
        // because of escUnicode flag in store0 method. This method is overriden
        // because of custom store0 method that can removeHeader.

        try (BufferedWriter writer = new BufferedWriter(
                new OutputStreamWriter(out, "8859_1"))) {
            store0(writer, comments, true);
        }
    }

    @Override
    public void store(Writer writer, String comments) throws IOException {

        // Keep same implementation as super Properties class. This method
        // is overriden because of custom store0 method that can removeHeader.

        BufferedWriter bufferedWriter;
        if (writer instanceof BufferedWriter) {
            bufferedWriter = (BufferedWriter) writer;
        } else {
            bufferedWriter = new BufferedWriter(writer);
        }
        try {
            store0(bufferedWriter, comments, false);
        } finally {
            writer.close();
        }
    }

    protected void store0(BufferedWriter bw, String comments, boolean escUnicode)
            throws IOException {
        if (comments != null) {
            writeComments(bw, comments);
        }

        // Here is the modification wanted
        if (!removeHeader) {
            bw.write("#" + new Date().toString());
            bw.newLine();
        }

        synchronized (this) {
            for (Enumeration e = keys(); e.hasMoreElements(); ) {
                String key = (String) e.nextElement();
                String val = (String) get(key);
                key = saveConvert(key, true, escUnicode);
                /* No need to escape embedded and trailing spaces for value, hence
                 * pass false to flag.
                 */
                val = saveConvert(val, false, escUnicode);
                bw.write(key + "=" + val);
                bw.newLine();
            }
        }
        bw.flush();
    }

    // --- Copy implementations from Properties superClass, the store0 method
    // is overriden and all method calls are private, so we copy the code here.

    protected String saveConvert(String theString,
                                 boolean escapeSpace,
                                 boolean escapeUnicode) {
        int len = theString.length();
        int bufLen = len * 2;
        if (bufLen < 0) {
            bufLen = Integer.MAX_VALUE;
        }
        StringBuilder outBuffer = new StringBuilder(bufLen);

        for (int x = 0; x < len; x++) {
            char aChar = theString.charAt(x);
            // Handle common case first, selecting largest block that
            // avoids the specials below
            if ((aChar > 61) && (aChar < 127)) {
                if (aChar == '\\') {
                    outBuffer.append('\\');
                    outBuffer.append('\\');
                    continue;
                }
                outBuffer.append(aChar);
                continue;
            }
            switch (aChar) {
                case ' ':
                    if (x == 0 || escapeSpace)
                        outBuffer.append('\\');
                    outBuffer.append(' ');
                    break;
                case '\t':
                    outBuffer.append('\\');
                    outBuffer.append('t');
                    break;
                case '\n':
                    outBuffer.append('\\');
                    outBuffer.append('n');
                    break;
                case '\r':
                    outBuffer.append('\\');
                    outBuffer.append('r');
                    break;
                case '\f':
                    outBuffer.append('\\');
                    outBuffer.append('f');
                    break;
                case '=': // Fall through
                case ':': // Fall through
                case '#': // Fall through
                case '!':
                    outBuffer.append('\\');
                    outBuffer.append(aChar);
                    break;
                default:
                    if (((aChar < 0x0020) || (aChar > 0x007e)) & escapeUnicode) {
                        outBuffer.append('\\');
                        outBuffer.append('u');
                        outBuffer.append(toHex((aChar >> 12) & 0xF));
                        outBuffer.append(toHex((aChar >> 8) & 0xF));
                        outBuffer.append(toHex((aChar >> 4) & 0xF));
                        outBuffer.append(toHex(aChar & 0xF));
                    } else {
                        outBuffer.append(aChar);
                    }
            }
        }
        return outBuffer.toString();
    }

    public void writeComments(BufferedWriter bw, String comments) throws IOException {
        bw.write("#");
        int len = comments.length();
        int current = 0;
        int last = 0;
        char[] uu = new char[6];
        uu[0] = '\\';
        uu[1] = 'u';
        while (current < len) {
            char c = comments.charAt(current);
            if (c > '\u00ff' || c == '\n' || c == '\r') {
                if (last != current)
                    bw.write(comments.substring(last, current));
                if (c > '\u00ff') {
                    uu[2] = toHex((c >> 12) & 0xf);
                    uu[3] = toHex((c >> 8) & 0xf);
                    uu[4] = toHex((c >> 4) & 0xf);
                    uu[5] = toHex(c & 0xf);
                    bw.write(new String(uu));
                } else {
                    bw.newLine();
                    if (c == '\r' &&
                            current != len - 1 &&
                            comments.charAt(current + 1) == '\n') {
                        current++;
                    }
                    if (current == len - 1 ||
                            (comments.charAt(current + 1) != '#' &&
                                    comments.charAt(current + 1) != '!'))
                        bw.write("#");
                }
                last = current + 1;
            }
            current++;
        }
        if (last != current)
            bw.write(comments.substring(last, current));
        bw.newLine();
    }

    /**
     * Convert a nibble to a hex character.
     *
     * @param nibble the nibble to convert.
     * @return the converted nibble
     */
    private char toHex(int nibble) {
        return hexDigit[(nibble & 0xF)];
    }

}
    

    

    

            

    

            



    
    






    
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