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     */
017    package org.apache.camel.util;
018    
019    /**
020     * Unit utils.
021     */
022    public 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\
029         * format with xx kB, xx MB, xx GB instead of 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    }