Re: [text][geometry] DoubleFormats utility
Hi. Le ven. 14 mai 2021 à 04:17, Matt Juntunen a écrit : > > Hello, > > Yes, the JDK definitely has number formatting capabilities. The class that I > propose moving to text was designed specifically for data IO operations, > where large numbers of doubles need to be serialized to strings in some > standard, non-localized format. I was unable to find exactly what I wanted > for this in the JDK, so I wrote my own class. The main advantages to this > code are that the produced formatters are 1) completely thread-safe, Out of curiosity, what are use-cases for this feature? > 2) easy to use, 3) offer a range of formats, and 4) are at least as > performant as BigDecimal and DecimalFormat. As a concrete discussion point, it might be interesting to post benchmarks comparisons. Regards, Gilles >> [...] - To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
Re: [text][geometry] DoubleFormats utility
Hello, Yes, the JDK definitely has number formatting capabilities. The class that I propose moving to text was designed specifically for data IO operations, where large numbers of doubles need to be serialized to strings in some standard, non-localized format. I was unable to find exactly what I wanted for this in the JDK, so I wrote my own class. The main advantages to this code are that the produced formatters are 1) completely thread-safe, 2) easy to use, 3) offer a range of formats, and 4) are at least as performant as BigDecimal and DecimalFormat. -Matt From: Benjamin Marwell Sent: Thursday, May 13, 2021 1:37 PM To: Commons Developers List Subject: Re: [text][geometry] DoubleFormats utility I'm not a commons committer, but I think it moved to Java 8, where you already have the same functionality available in the JDK. NumberFormat and DecimalFormat [1] will do the same already, if I am not mistaken. Ben 1: https://www.baeldung.com/java-number-formatting On Thu, 13 May 2021, 17:59 Matt Juntunen, wrote: > Hello, > > For the geometry IO work I did recently, I ended up creating a > DoubleFormats [1] utility class that generates formatters for various > floating point string representations. It creates formatters for plain > (straight decimal), scientific, engineering, and mixed plain and scientific > formats. A maximum number of significant decimal digits and a minimum > exponent value can be specified for each format. Here is a simple example: > > > int maxPrecision = 4; > > DoubleFormat plain = DoubleFormats.createPlain(maxPrecision); > plain.format(Math.PI); // 3.142 > plain.format(-123456789); // -12350.0 > plain.format(1.23456789e-6); // 0.01235 > > DoubleFormat eng = DoubleFormats.createEngineering(maxPrecision); > eng.format(Math.PI); // 3.142 > eng.format(-123456789); // -123.5E6 > eng.format(1.23456789e-6); // 1.235E-6 > > > I currently have the methods returning a DoubleFormat functional interface > but I plan on changing this to simply DoubleFunction. > > Is there any interest in moving this functionality to commons-text? I find > it quite useful since it is thread-safe and much faster than using > String.format or similar. I've actually created a class with much the same > functionality for use in my day job. It would be nice if I could use > something from commons for that. > > Regards, > Matt J > > [1] > https://github.com/apache/commons-geometry/blob/master/commons-geometry-io-core/src/main/java/org/apache/commons/geometry/io/core/utils/DoubleFormats.java > >
Re: [text][geometry] DoubleFormats utility
I'm not a commons committer, but I think it moved to Java 8, where you already have the same functionality available in the JDK. NumberFormat and DecimalFormat [1] will do the same already, if I am not mistaken. Ben 1: https://www.baeldung.com/java-number-formatting On Thu, 13 May 2021, 17:59 Matt Juntunen, wrote: > Hello, > > For the geometry IO work I did recently, I ended up creating a > DoubleFormats [1] utility class that generates formatters for various > floating point string representations. It creates formatters for plain > (straight decimal), scientific, engineering, and mixed plain and scientific > formats. A maximum number of significant decimal digits and a minimum > exponent value can be specified for each format. Here is a simple example: > > > int maxPrecision = 4; > > DoubleFormat plain = DoubleFormats.createPlain(maxPrecision); > plain.format(Math.PI); // 3.142 > plain.format(-123456789); // -12350.0 > plain.format(1.23456789e-6); // 0.01235 > > DoubleFormat eng = DoubleFormats.createEngineering(maxPrecision); > eng.format(Math.PI); // 3.142 > eng.format(-123456789); // -123.5E6 > eng.format(1.23456789e-6); // 1.235E-6 > > > I currently have the methods returning a DoubleFormat functional interface > but I plan on changing this to simply DoubleFunction. > > Is there any interest in moving this functionality to commons-text? I find > it quite useful since it is thread-safe and much faster than using > String.format or similar. I've actually created a class with much the same > functionality for use in my day job. It would be nice if I could use > something from commons for that. > > Regards, > Matt J > > [1] > https://github.com/apache/commons-geometry/blob/master/commons-geometry-io-core/src/main/java/org/apache/commons/geometry/io/core/utils/DoubleFormats.java > >
[text][geometry] DoubleFormats utility
Hello, For the geometry IO work I did recently, I ended up creating a DoubleFormats [1] utility class that generates formatters for various floating point string representations. It creates formatters for plain (straight decimal), scientific, engineering, and mixed plain and scientific formats. A maximum number of significant decimal digits and a minimum exponent value can be specified for each format. Here is a simple example: int maxPrecision = 4; DoubleFormat plain = DoubleFormats.createPlain(maxPrecision); plain.format(Math.PI); // 3.142 plain.format(-123456789); // -12350.0 plain.format(1.23456789e-6); // 0.01235 DoubleFormat eng = DoubleFormats.createEngineering(maxPrecision); eng.format(Math.PI); // 3.142 eng.format(-123456789); // -123.5E6 eng.format(1.23456789e-6); // 1.235E-6 I currently have the methods returning a DoubleFormat functional interface but I plan on changing this to simply DoubleFunction. Is there any interest in moving this functionality to commons-text? I find it quite useful since it is thread-safe and much faster than using String.format or similar. I've actually created a class with much the same functionality for use in my day job. It would be nice if I could use something from commons for that. Regards, Matt J [1] https://github.com/apache/commons-geometry/blob/master/commons-geometry-io-core/src/main/java/org/apache/commons/geometry/io/core/utils/DoubleFormats.java
