hg: jdk7/tl/jdk: 6860431: Character.isSurrogate(char ch)

[Ulf Zibis]

Am 02.09.2009 05:21, Martin Buchholz schrieb:
>
>
>     - I would like to see backwards-referring like:
>       public static final int MIN_CODE_POINT = MIN_VALUE;
>       public static final int MIN_SUPPLEMENTARY_CODE_POINT = MAX_VALUE
>     + 1;
>
>
> Those would work, but would add to the confusion
> between code points and UTF-16 code units.
> Notice how "MAX_VALUE + 1" looks like an oxymoron.
>
;-)
But I don't have any problem as I don't have using Byte.MAX_VALUE + 1.
The real source of the confusion is elsewhere, i.e. imagine we would 
have class Integer managing 16 + 32 bit values.

Maybe it would become more clear adding MAX_SUPPLEMENTARY_CODE_POINT for 
*consistency* and having following order:
(Note that I added " of type {@code int}", similar to description of 
MIN_VALUE.)

    /**
     * The minimum value of a
     * <a href="http://www.unicode.org/glossary/#code_point">
     * Unicode code point</a>, constant {@code U+0000}
     * of type {@code int}.
     *
     * @since 1.5
     */
    public static final int MIN_CODE_POINT = MIN_VALUE;

    /**
     * The minimum value of a
     * <a href="http://www.unicode.org/glossary/#supplementary_code_point">
     * Unicode supplementary code point</a>, constant {@code U+10000}
     * of type {@code int}.
     *
     * @since 1.5
     */
    public static final int MIN_SUPPLEMENTARY_CODE_POINT = MAX_VALUE + 1;

    /**
     * The maximum value of a
     * <a href="http://www.unicode.org/glossary/#code_point">
     * Unicode code point</a>, constant {@code U+10FFFF}
     * of type {@code int}.
     *
     * @since 1.5
     */
    public static final int MAX_CODE_POINT = 0X10FFFF;

    /**
     * The maximum value of a
     * <a href="http://www.unicode.org/glossary/#supplementary_code_point">
     * Unicode supplementary code point</a>, constant {@code U+10FFFF}
     * of type {@code int}.
     *
     * @since 1.7
     */
    public static final int MAX_SUPPLEMENTARY_CODE_POINT = MAX_CODE_POINT;



Having following would be useful too:

    public static final byte MIN_ASCII = MIN_VALUE;
    public static final byte MAX_ASCII = Byte.MAX_VALUE;


-Ulf


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