RFR: 8251989: Hex formatting and parsing utility [v10]
Chris Hegarty
chegar at openjdk.java.net
Fri Nov 27 09:36:15 UTC 2020
On Wed, 25 Nov 2020 22:51:44 GMT, Roger Riggs <rriggs at openjdk.org> wrote:
>> java.util.HexFormat utility:
>>
>> - Format and parse hexadecimal strings, with parameters for delimiter, prefix, suffix and upper/lowercase
>> - Static factories and builder methods to create HexFormat copies with modified parameters.
>> - Consistent naming of methods for conversion of byte arrays to formatted strings and back: formatHex and parseHex
>> - Consistent naming of methods for conversion of primitive types: toHexDigits... and fromHexDigits...
>> - Prefix and suffixes now apply to each formatted value, not the string as a whole
>> - Using java.util.Appendable as a target for buffered conversions so output to Writers and PrintStreams
>> like System.out are supported in addition to StringBuilder. (IOExceptions are converted to unchecked exceptions)
>> - Immutable and thread safe, a "value-based" class
>>
>> See the [HexFormat javadoc](http://cr.openjdk.java.net/~rriggs/8251989-hex-formatter/java.base/java/util/HexFormat.html) for details.
>>
>> Review comments and suggestions welcome.
>
> Roger Riggs has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 19 additional commits since the last revision:
>
> - Clarified that suffix() and prefix() methods do not return null, instead the empty string is returned.
> - Merge branch 'master' into 8251989-hex-formatter
> - Merge branch 'master' into 8251989-hex-formatter
> - Merge branch 'master' into 8251989-hex-formatter
> - The HexFormat API indexing model for array and string ranges is changed
> to describe the range using 'fromIndex (inclusive)' and 'toIndex (exclusive)'.
>
> Initially, it was specified as 'index' and 'length'. However, both byte arrays
> and strings used in the HexFormat API typically use fromIndex and toIndex
> to describe ranges. Using the same indexing model can prevent mistakes.
>
> The change affects the methods and corresponding tests:
>
> formatHex(byte[] bytes, int fromIndex, int toIndex)
> formatHex(A out, byte[] bytes, int fromIndex, int toIndex)
> parseHex(char[] chars, int fromIndex, int toIndex)
> parseHex(CharSequence string, int fromIndex, int toIndex)
> fromHexDigits(CharSequence string, int fromIndex, int toIndex)
> fromHexDigitsToLong(CharSequence string, int fromIndex, int toIndex)
> - - Added @see and @link references to Integer.toHexString and Long.toHexString
> - Clarified parsing is case insensistive in various parse and fromXXX methods
> - Source level cleanup based on review comments
> - Expanded some javadoc tag text to make it more descriptive
> - Consistent use of 'hexadecimal' vs 'hex'
> - Review comment updates to class javadoc
> - Review comment updates, in the example code, and to describe the characters used to convert to hexadecimal
> - Correct length of StringBuilder in formatHex;
> Correct bug in formatHex(char[], 2, 3) and add test for subranges of char[]
> - Merge branch 'master' into 8251989-hex-formatter
> - ... and 9 more: https://git.openjdk.java.net/jdk/compare/5386ae35...b19d2827
src/java.base/share/classes/java/util/HexFormat.java line 255:
> 253:
> 254: /**
> 255: * Returns the delimiter between hexadecimal values in a formatted byte array.
"... in a formatted byte array", I find this wording a little hard to follow. The delimiter, prefix, suffix apply to *formatted hexadecimal strings*.
-------------
PR: https://git.openjdk.java.net/jdk/pull/482
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