character.java

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    * Strong bidirectional character type "AL" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC = 2;

    /**
     * Weak bidirectional character type "EN" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_EUROPEAN_NUMBER = 3;

    /**
     * Weak bidirectional character type "ES" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR = 4;

    /**
     * Weak bidirectional character type "ET" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR = 5;

    /**
     * Weak bidirectional character type "AN" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_ARABIC_NUMBER = 6;

    /**
     * Weak bidirectional character type "CS" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_COMMON_NUMBER_SEPARATOR = 7;

    /**
     * Weak bidirectional character type "NSM" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_NONSPACING_MARK = 8;

    /**
     * Weak bidirectional character type "BN" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_BOUNDARY_NEUTRAL = 9;

    /**
     * Neutral bidirectional character type "B" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_PARAGRAPH_SEPARATOR = 10;

    /**
     * Neutral bidirectional character type "S" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_SEGMENT_SEPARATOR = 11;

    /**
     * Neutral bidirectional character type "WS" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_WHITESPACE = 12;

    /**
     * Neutral bidirectional character type "ON" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_OTHER_NEUTRALS = 13;

    /**
     * Strong bidirectional character type "LRE" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING = 14;

    /**
     * Strong bidirectional character type "LRO" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE = 15;

    /**
     * Strong bidirectional character type "RLE" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING = 16;

    /**
     * Strong bidirectional character type "RLO" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE = 17;

    /**
     * Weak bidirectional character type "PDF" in the Unicode specification.
     * @since 1.4
     */
    public static final byte DIRECTIONALITY_POP_DIRECTIONAL_FORMAT = 18;

    // Maximum character handled by internal fast-path code which
    // avoids initializing large tables.
    // Note: performance of this "fast-path" code may be sub-optimal
    // in negative cases for some accessors due to complicated ranges.
    // Should revisit after optimization of table initialization.
    private static final int FAST_PATH_MAX = 255;

    /**
     * Instances of this class represent particular subsets of the Unicode
     * character set.  The only family of subsets defined in the
     * <code>Character</code> class is <code>{@link Character.UnicodeBlock
     * UnicodeBlock}</code>.  Other portions of the Java API may define other
     * subsets for their own purposes.
     *
     * @since 1.2
     */
    public static class Subset  {

        private String name;

        /**
         * Constructs a new <code>Subset</code> instance.
         *
         * @exception NullPointerException if name is <code>null</code>
         * @param  name  The name of this subset
         */
        protected Subset(String name) {
            if (name == null) {
                throw new NullPointerException("name");
            }
            this.name = name;
        }

        /**
         * Compares two <code>Subset</code> objects for equality.
         * This method returns <code>true</code> if and only if
         * <code>this</code> and the argument refer to the same
         * object; since this method is <code>final</code>, this
         * guarantee holds for all subclasses.
         */
        public final boolean equals(Object obj) {
            return (this == obj);
        }

        /**
         * Returns the standard hash code as defined by the
         * <code>{@link Object#hashCode}</code> method.  This method
         * is <code>final</code> in order to ensure that the
         * <code>equals</code> and <code>hashCode</code> methods will
         * be consistent in all subclasses.
         */
        public final int hashCode() {
            return super.hashCode();
        }

        /**
         * Returns the name of this subset.
         */
        public final String toString() {
            return name;
        }
    }

    /**
     * A family of character subsets representing the character blocks in the
     * Unicode specification. Character blocks generally define characters
     * used for a specific script or purpose. A character is contained by
     * at most one Unicode block.
     *
     * @since 1.2
     */
    public static final class UnicodeBlock extends Subset {

        private UnicodeBlock(String name) {
            super(name);
        }

        /**
         * Constant for the Unicode character block of the same name.
         */
        public static final UnicodeBlock
            BASIC_LATIN
                = new UnicodeBlock("BASIC_LATIN"),
            LATIN_1_SUPPLEMENT
                = new UnicodeBlock("LATIN_1_SUPPLEMENT"),
            LATIN_EXTENDED_A
                = new UnicodeBlock("LATIN_EXTENDED_A"),
            LATIN_EXTENDED_B
                = new UnicodeBlock("LATIN_EXTENDED_B"),
            IPA_EXTENSIONS
                = new UnicodeBlock("IPA_EXTENSIONS"),
            SPACING_MODIFIER_LETTERS
                = new UnicodeBlock("SPACING_MODIFIER_LETTERS"),
            COMBINING_DIACRITICAL_MARKS
                = new UnicodeBlock("COMBINING_DIACRITICAL_MARKS"),
            GREEK
                = new UnicodeBlock("GREEK"),
            CYRILLIC
                = new UnicodeBlock("CYRILLIC"),
            ARMENIAN
                = new UnicodeBlock("ARMENIAN"),
            HEBREW
                = new UnicodeBlock("HEBREW"),
            ARABIC
                = new UnicodeBlock("ARABIC"),
            DEVANAGARI
                = new UnicodeBlock("DEVANAGARI"),
            BENGALI
                = new UnicodeBlock("BENGALI"),
            GURMUKHI
                = new UnicodeBlock("GURMUKHI"),
            GUJARATI
                = new UnicodeBlock("GUJARATI"),
            ORIYA
                = new UnicodeBlock("ORIYA"),
            TAMIL
                = new UnicodeBlock("TAMIL"),
            TELUGU
                = new UnicodeBlock("TELUGU"),
            KANNADA
                = new UnicodeBlock("KANNADA"),
            MALAYALAM
                = new UnicodeBlock("MALAYALAM"),
            THAI
                = new UnicodeBlock("THAI"),
            LAO
                = new UnicodeBlock("LAO"),
            TIBETAN
                = new UnicodeBlock("TIBETAN"),
            GEORGIAN
                = new UnicodeBlock("GEORGIAN"),
            HANGUL_JAMO
                = new UnicodeBlock("HANGUL_JAMO"),
            LATIN_EXTENDED_ADDITIONAL
                = new UnicodeBlock("LATIN_EXTENDED_ADDITIONAL"),
            GREEK_EXTENDED
                = new UnicodeBlock("GREEK_EXTENDED"),
            GENERAL_PUNCTUATION
                = new UnicodeBlock("GENERAL_PUNCTUATION"),
            SUPERSCRIPTS_AND_SUBSCRIPTS
                = new UnicodeBlock("SUPERSCRIPTS_AND_SUBSCRIPTS"),
            CURRENCY_SYMBOLS
                = new UnicodeBlock("CURRENCY_SYMBOLS"),
            COMBINING_MARKS_FOR_SYMBOLS
                = new UnicodeBlock("COMBINING_MARKS_FOR_SYMBOLS"),
            LETTERLIKE_SYMBOLS
                = new UnicodeBlock("LETTERLIKE_SYMBOLS"),
            NUMBER_FORMS
                = new UnicodeBlock("NUMBER_FORMS"),
            ARROWS
                = new UnicodeBlock("ARROWS"),
            MATHEMATICAL_OPERATORS
                = new UnicodeBlock("MATHEMATICAL_OPERATORS"),
            MISCELLANEOUS_TECHNICAL
                = new UnicodeBlock("MISCELLANEOUS_TECHNICAL"),
            CONTROL_PICTURES
                = new UnicodeBlock("CONTROL_PICTURES"),
            OPTICAL_CHARACTER_RECOGNITION
                = new UnicodeBlock("OPTICAL_CHARACTER_RECOGNITION"),
            ENCLOSED_ALPHANUMERICS
                = new UnicodeBlock("ENCLOSED_ALPHANUMERICS"),
            BOX_DRAWING
                = new UnicodeBlock("BOX_DRAWING"),
            BLOCK_ELEMENTS
                = new UnicodeBlock("BLOCK_ELEMENTS"),
            GEOMETRIC_SHAPES
                = new UnicodeBlock("GEOMETRIC_SHAPES"),
            MISCELLANEOUS_SYMBOLS
                = new UnicodeBlock("MISCELLANEOUS_SYMBOLS"),
            DINGBATS
                = new UnicodeBlock("DINGBATS"),
            CJK_SYMBOLS_AND_PUNCTUATION
                = new UnicodeBlock("CJK_SYMBOLS_AND_PUNCTUATION"),
            HIRAGANA
                = new UnicodeBlock("HIRAGANA"),
            KATAKANA
                = new UnicodeBlock("KATAKANA"),
            BOPOMOFO
                = new UnicodeBlock("BOPOMOFO"),
            HANGUL_COMPATIBILITY_JAMO
                = new UnicodeBlock("HANGUL_COMPATIBILITY_JAMO"),
            KANBUN
                = new UnicodeBlock("KANBUN"),
            ENCLOSED_CJK_LETTERS_AND_MONTHS
                = new UnicodeBlock("ENCLOSED_CJK_LETTERS_AND_MONTHS"),
            CJK_COMPATIBILITY
                = new UnicodeBlock("CJK_COMPATIBILITY"),
            CJK_UNIFIED_IDEOGRAPHS
                = new UnicodeBlock("CJK_UNIFIED_IDEOGRAPHS"),
            HANGUL_SYLLABLES
                = new UnicodeBlock("HANGUL_SYLLABLES"),
            SURROGATES_AREA
                = new UnicodeBlock("SURROGATES_AREA"),
            PRIVATE_USE_AREA
                = new UnicodeBlock("PRIVATE_USE_AREA"),
            CJK_COMPATIBILITY_IDEOGRAPHS
                = new UnicodeBlock("CJK_COMPATIBILITY_IDEOGRAPHS"),
            ALPHABETIC_PRESENTATION_FORMS
                = new UnicodeBlock("ALPHABETIC_PRESENTATION_FORMS"),
            ARABIC_PRESENTATION_FORMS_A
                = new UnicodeBlock("ARABIC_PRESENTATION_FORMS_A"),
            COMBINING_HALF_MARKS
                = new UnicodeBlock("COMBINING_HALF_MARKS"),
            CJK_COMPATIBILITY_FORMS
                = new UnicodeBlock("CJK_COMPATIBILITY_FORMS"),
            SMALL_FORM_VARIANTS
                = new UnicodeBlock("SMALL_FORM_VARIANTS"),
            ARABIC_PRESENTATION_FORMS_B
                = new UnicodeBlock("ARABIC_PRESENTATION_FORMS_B"),
            HALFWIDTH_AND_FULLWIDTH_FORMS
                = new UnicodeBlock("HALFWIDTH_AND_FULLWIDTH_FORMS"),
            SPECIALS
                = new UnicodeBlock("SPECIALS");

        /**
         * Constant for the Unicode character block of the same name.
         *
         * @since 1.4
         */
        public static final UnicodeBlock
            SYRIAC
                = new UnicodeBlock("SYRIAC"),
            THAANA
                = new UnicodeBlock("THAANA"),
            SINHALA
                = new UnicodeBlock("SINHALA"),
            MYANMAR
                = new UnicodeBlock("MYANMAR"),
            ETHIOPIC
                = new UnicodeBlock("ETHIOPIC"),
            CHEROKEE
                = new UnicodeBlock("CHEROKEE"),
            UNIFIED_CANADIAN_ABORIGINAL_SYLLABICS
                = new UnicodeBlock("UNIFIED_CANADIAN_ABORIGINAL_SYLLABICS"),
            OGHAM
                = new UnicodeBlock("OGHAM"),
            RUNIC
                = new UnicodeBlock("RUNIC"),
            KHMER
                = new UnicodeBlock("KHMER"),
            MONGOLIAN
                = new UnicodeBlock("MONGOLIAN"),
            BRAILLE_PATTERNS
                = new UnicodeBlock("BRAILLE_PATTERNS"),
            CJK_RADICALS_SUPPLEMENT
                = new UnicodeBlock("CJK_RADICALS_SUPPLEMENT"),
            KANGXI_RADICALS
                = new UnicodeBlock("KANGXI_RADICALS"),
            IDEOGRAPHIC_DESCRIPTION_CHARACTERS =
                new UnicodeBlock("IDEOGRAPHIC_DESCRIPTION_CHARACTERS"),
            BOPOMOFO_EXTENDED
                = new UnicodeBlock("BOPOMOFO_EXTENDED"),
            CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
                = new UnicodeBlock("CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A"),
            YI_SYLLABLES
                = new UnicodeBlock("YI_SYLLABLES"),
            YI_RADICALS
                = new UnicodeBlock("YI_RADICALS");