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97 changes: 97 additions & 0 deletions
97
src/main/java/com/cleanroommc/bogosorter/common/ReadableNumberConverter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| package com.cleanroommc.bogosorter.common; | ||
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| import java.math.RoundingMode; | ||
| import java.text.DecimalFormat; | ||
| import java.text.DecimalFormatSymbols; | ||
| import java.text.Format; | ||
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| /** | ||
| * copy from nei copy from ae2 Converter class to convert a large number into a SI system. | ||
| * | ||
| * @author thatsIch | ||
| * @version rv2 | ||
| * @since rv2 | ||
| */ | ||
| public enum ReadableNumberConverter { | ||
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| INSTANCE; | ||
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| /** | ||
| * Defines the base for a division, non-si standard could be 1024 for kilobytes | ||
| */ | ||
| private static final int DIVISION_BASE = 1000; | ||
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| /** | ||
| * String representation of the sorted postfixes | ||
| */ | ||
| private static final char[] ENCODED_POSTFIXES = "KMGTPE".toCharArray(); | ||
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| private final Format format; | ||
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| /** | ||
| * Initializes the specific decimal format with special format for negative and positive numbers | ||
| */ | ||
| ReadableNumberConverter() { | ||
| final DecimalFormatSymbols symbols = new DecimalFormatSymbols(); | ||
| symbols.setDecimalSeparator('.'); | ||
| symbols.setGroupingSeparator(','); | ||
| final DecimalFormat format = new DecimalFormat(".#;0.#"); | ||
| format.setDecimalFormatSymbols(symbols); | ||
| format.setRoundingMode(RoundingMode.DOWN); | ||
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| this.format = format; | ||
| } | ||
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| public String toSlimReadableForm(final long number) { | ||
| return this.toReadableFormRestrictedByWidth(number, 3); | ||
| } | ||
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| /** | ||
| * restricts a string representation of a number to a specific width | ||
| * | ||
| * @param number to be formatted number | ||
| * @param width width limitation of the resulting number | ||
| * @return formatted number restricted by the width limitation | ||
| */ | ||
| private String toReadableFormRestrictedByWidth(final long number, final int width) { | ||
| assert number >= 0; | ||
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| // handles low numbers more efficiently since no format is needed | ||
| final String numberString = Long.toString(number); | ||
| int numberSize = numberString.length(); | ||
| if (numberSize <= width) { | ||
| return numberString; | ||
| } | ||
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| long base = number; | ||
| double last = base * 1000; | ||
| int exponent = -1; | ||
| String postFix = ""; | ||
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| while (numberSize > width) { | ||
| last = base; | ||
| base /= DIVISION_BASE; | ||
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| exponent++; | ||
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| // adds +1 due to the postfix | ||
| numberSize = Long.toString(base) | ||
| .length() + 1; | ||
| postFix = String.valueOf(ENCODED_POSTFIXES[exponent]); | ||
| } | ||
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| final String withPrecision = this.format.format(last / DIVISION_BASE) + postFix; | ||
| final String withoutPrecision = Long.toString(base) + postFix; | ||
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| final String slimResult = (withPrecision.length() <= width) ? withPrecision : withoutPrecision; | ||
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| // post condition | ||
| assert slimResult.length() <= width; | ||
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| return slimResult; | ||
| } | ||
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| public String toWideReadableForm(final long number) { | ||
| return this.toReadableFormRestrictedByWidth(number, 4); | ||
| } | ||
| } |
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