Package org.orekit.utils.formatting

Class FastScientificFormatter

java.lang.Object

org.orekit.utils.formatting.FastDoubleFormatter

org.orekit.utils.formatting.FastScientificFormatter

public class FastScientificFormatter
extends FastDoubleFormatter

Formatter for double numbers in scientific format with low overhead.

This class is intended to be used when formatting large amounts of data with fixed scientific formats like, for example, large ephemeris or measurement files.

Building the formatter is done once, and the formatter FastDoubleFormatter.appendTo(Appendable, double) or FastDoubleFormatter.toString(double) methods can be called hundreds of thousands of times, without incurring the overhead that would occur with String.format(). Some tests showed this formatter is about 6-7 times faster than String.format() with %{width}.{%precision}e format.

Instances of this class are immutable

Since:

14.0

Author:

Luc Maisonobe

Constructor Summary

Constructors

Constructor	Description
FastScientificFormatter(int width)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
protected void	appendRegularValueTo(Appendable appendable, double value)	Append one formatted value to an Appendable.

Methods inherited from class org.orekit.utils.formatting.FastDoubleFormatter

appendTo, getWidth, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FastScientificFormatter

public FastScientificFormatter(int width)

Simple constructor.

This constructor is equivalent to Formatter float format %{width}.{width-7}e

Parameters:

width - number of characters to output

Method Detail

appendRegularValueTo

protected void appendRegularValueTo(Appendable appendable,
                                    double value)
                             throws IOException

Append one formatted value to an Appendable.

Specified by:

appendRegularValueTo in class FastDoubleFormatter

Parameters:

appendable - to append value to

value - value to format

Throws:

IOException - if an I/O error occurs