001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.util; 018 019import java.text.DecimalFormatSymbols; 020 021/** 022 * Unit utils. 023 */ 024public final class UnitUtils { 025 026 private UnitUtils() { 027 } 028 029 /** 030 * If having a size in bytes and wanting to print this in human friendly\ format with xx kB, xx MB, xx GB instead of 031 * a large byte number. 032 * 033 * @param bytes the value in bytes 034 */ 035 public static String printUnitFromBytes(long bytes) { 036 if (bytes < 0) { 037 return ""; 038 } 039 040 // http://stackoverflow.com/questions/3758606/how-to-convert-byte-size-into-human-readable-format-in-java 041 int unit = 1000; 042 if (bytes < unit) { 043 return bytes + " B"; 044 } 045 int exp = (int) (Math.log(bytes) / Math.log(unit)); 046 String pre = "" + "kMGTPE".charAt(exp - 1); 047 return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre); 048 } 049 050 /** 051 * If having a size in bytes and wanting to print this in human friendly\ format with xx kB, xx MB, xx GB instead of 052 * a large byte number, using dot as decimal separator. 053 * 054 * @param bytes the value in bytes 055 */ 056 public static String printUnitFromBytesDot(long bytes) { 057 return printUnitFromBytes(bytes, '.'); 058 } 059 060 /** 061 * If having a size in bytes and wanting to print this in human friendly\ format with xx kB, xx MB, xx GB instead of 062 * a large byte number. 063 * 064 * @param bytes the value in bytes 065 * @param decimal the decimal separator char to use 066 */ 067 public static String printUnitFromBytes(long bytes, char decimal) { 068 if (bytes < 0) { 069 return ""; 070 } 071 072 // http://stackoverflow.com/questions/3758606/how-to-convert-byte-size-into-human-readable-format-in-java 073 int unit = 1000; 074 if (bytes < unit) { 075 return bytes + " B"; 076 } 077 int exp = (int) (Math.log(bytes) / Math.log(unit)); 078 String pre = "" + "kMGTPE".charAt(exp - 1); 079 String answer = String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre); 080 081 char sep = DecimalFormatSymbols.getInstance().getDecimalSeparator(); 082 if (decimal != sep) { 083 answer = answer.replace(sep, decimal); 084 } 085 return answer; 086 } 087 088}