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
019/**
020 * Unit utils.
021 */
022public final class UnitUtils {
023
024    private UnitUtils() {
025    }
026
027    /**
028     * If having a size in bytes and wanting to print this in human friendly\ format with xx kB, xx MB, xx GB instead of
029     * a large byte number.
030     *
031     * @param bytes the value in bytes
032     */
033    public static String printUnitFromBytes(long bytes) {
034        // http://stackoverflow.com/questions/3758606/how-to-convert-byte-size-into-human-readable-format-in-java
035        int unit = 1000;
036        if (bytes < unit) {
037            return bytes + " B";
038        }
039        int exp = (int) (Math.log(bytes) / Math.log(unit));
040        String pre = "" + "kMGTPE".charAt(exp - 1);
041        return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
042    }
043}