[jira] [Commented] (TEXT-207) Include DoubleFormats utility from commons-geometry

["Matt Juntunen (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEXT-207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17375171#comment-17375171 ] 

Matt Juntunen commented on TEXT-207:
------------------------------------

Added PR: [https://github.com/apache/commons-text/pull/248]. I simplified the API quite a bit and just used {{DoubleFunction<String>}} for the format functions instead of a separate {{DoubleFormat}} interface.

 
The benchmarks show that {{DoubleFormat}} is in general slightly faster than {{DecimalFormat}}.
 ||Benchmark||(maxExp)||(minExp)||(size)||Mode||Cnt||Score||Error||Units||
|doubleToString|100|-100|10000|avgt|5|5327103.157|±  59484.165|ns/op|
|decimalFormatEngineering|100|-100|10000|avgt|5|7623550.442|± 467970.473|ns/op|
|decimalFormatPlain|100|-100|10000|avgt|5|7440352.981|±  69927.574|ns/op|
|decimalFormatPlainGrouped|100|-100|10000|avgt|5|7913219.202|± 150656.318|ns/op|
|decimalFormatScientific|100|-100|10000|avgt|5|7319364.462|±  57894.693|ns/op|
|doubleFormatEngineering|100|-100|10000|avgt|5|7244752.382|± 178986.471|ns/op|
|doubleFormatPlain|100|-100|10000|avgt|5|6649716.962|±  97897.504|ns/op|
|doubleFormatPlainGrouped|100|-100|10000|avgt|5|6907835.195|±  86801.050|ns/op|
|doubleFormatScientific|100|-100|10000|avgt|5|7209926.599|± 638461.646|ns/op|


> Include DoubleFormats utility from commons-geometry
> ---------------------------------------------------
>
>                 Key: TEXT-207
>                 URL: https://issues.apache.org/jira/browse/TEXT-207
>             Project: Commons Text
>          Issue Type: New Feature
>            Reporter: Matt Juntunen
>            Priority: Major
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> commons-geometry currently contains a [DoubleFormats|https://github.com/apache/commons-geometry/blob/master/commons-geometry-io-core/src/main/java/org/apache/commons/geometry/io/core/utils/DoubleFormats.java] utility class in the {{commons-geometry-io-core}} module that produces standardized string representations of doubles for use in text-based data formats. It has the following features:
> - It is completely thread-safe.
> - It produces string in scientific, engineering, plain, or mixed (plain or scientific depending on value) formats.
> - Performance is comparable to {{DecimalFormat}} and {{BigDecimal}}.
> As mentioned on the dev mailing list, I believe that this class has broader applicability than just geometric data formats and would be a good fit for commons-text.



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