Package org.orekit.utils.formatting
Class FastDoubleFormatter
- java.lang.Object
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- org.orekit.utils.formatting.FastDoubleFormatter
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public class FastDoubleFormatter extends Object
Formatter for double numbers with low overhead.This class is intended to be used when formatting large amounts of data with fixed formats like, for example, large ephemeris or measurement files.
Building the formatter is done once, and the formatter
appendTo(Appendable, double)
ortoString(double)
methods can be called hundreds of thousands of times, without incurring the overhead that would occur withString.format()
. Some tests showed this formatter is about 5 times faster thanString.format()
with%{width}.{%precision}f
format.Instances of this class are immutable
- Since:
- 13.0.3
- Author:
- Luc Maisonobe
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Constructor Summary
Constructors Constructor Description FastDoubleFormatter(int width, int precision)
Simple constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
appendTo(Appendable appendable, double value)
Append one formatted value to anAppendable
.int
getPrecision()
Get the precision.int
getWidth()
Get the width.String
toString(double value)
Format one value.
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Constructor Detail
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FastDoubleFormatter
public FastDoubleFormatter(int width, int precision)
Simple constructor.This constructor is equivalent to
Formatter
float format%{width}.{precision}f
- Parameters:
width
- number of characters to outputprecision
- number of decimal precision
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Method Detail
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getWidth
public int getWidth()
Get the width.- Returns:
- width
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getPrecision
public int getPrecision()
Get the precision.- Returns:
- precision
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appendTo
public void appendTo(Appendable appendable, double value) throws IOException
Append one formatted value to anAppendable
.- Parameters:
appendable
- to append value tovalue
- value to format- Throws:
IOException
- if an I/O error occurs
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toString
public String toString(double value)
Format one value.- Parameters:
value
- value to format- Returns:
- formatted string
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