yueh
125 lines
3.4 KiB
Java
125 lines
3.4 KiB
Java
/*
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* This file is part of Applied Energistics 2.
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* Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved.
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*
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* Applied Energistics 2 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Applied Energistics 2 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Applied Energistics 2. If not, see <http://www.gnu.org/licenses/lgpl>.
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*/
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package appeng.util;
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import java.math.RoundingMode;
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import java.text.DecimalFormat;
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import java.text.DecimalFormatSymbols;
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import java.text.Format;
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/**
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* Converter class to convert a large number into a SI system.
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*
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* @author thatsIch
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* @version rv2
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* @since rv2
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*/
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public enum ReadableNumberConverter implements ISlimReadableNumberConverter, IWideReadableNumberConverter
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{
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INSTANCE;
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/**
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* Defines the base for a division, non-si standard could be 1024 for kilobytes
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*/
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private static final int DIVISION_BASE = 1000;
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/**
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* String representation of the sorted postfixes
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*/
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private static final char[] ENCODED_POSTFIXES = "KMGTPE".toCharArray();
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private final Format format;
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/**
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* Initializes the specific decimal format with special format for negative and positive numbers
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*/
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ReadableNumberConverter()
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{
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final DecimalFormatSymbols symbols = new DecimalFormatSymbols();
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symbols.setDecimalSeparator( '.' );
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final DecimalFormat format = new DecimalFormat( ".#;0.#" );
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format.setDecimalFormatSymbols( symbols );
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format.setRoundingMode( RoundingMode.DOWN );
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this.format = format;
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}
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@Override
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public String toSlimReadableForm( final long number )
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{
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return this.toReadableFormRestrictedByWidth( number, 3 );
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}
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/**
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* restricts a string representation of a number to a specific width
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*
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* @param number to be formatted number
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* @param width width limitation of the resulting number
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*
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* @return formatted number restricted by the width limitation
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*/
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private String toReadableFormRestrictedByWidth( final long number, final int width )
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{
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assert number >= 0;
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// handles low numbers more efficiently since no format is needed
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final String numberString = Long.toString( number );
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int numberSize = numberString.length();
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if( numberSize <= width )
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{
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return numberString;
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}
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long base = number;
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double last = base * 1000;
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int exponent = -1;
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String postFix = "";
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while( numberSize > width )
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{
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last = base;
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base /= DIVISION_BASE;
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exponent++;
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// adds +1 due to the postfix
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numberSize = Long.toString( base ).length() + 1;
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postFix = String.valueOf( ENCODED_POSTFIXES[exponent] );
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}
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final String withPrecision = this.format.format( last / DIVISION_BASE ) + postFix;
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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
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assert slimResult.length() <= width;
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return slimResult;
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}
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@Override
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public String toWideReadableForm( final long number )
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{
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return this.toReadableFormRestrictedByWidth( number, 4 );
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}
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}
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