001package ca.uhn.fhir.util;
002
003/*-
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2021 Smile CDR, Inc.
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import java.text.DecimalFormat;
024
025public class FileUtil {
026        // Use "bytes" instead of just "b" because it reads easier in logs
027        private static final String[] UNITS = new String[]{"Bytes", "kB", "MB", "GB", "TB"};
028
029        public static String formatFileSize(long theBytes) {
030                if (theBytes <= 0) {
031                        return "0 " + UNITS[0];
032                }
033                int digitGroups = (int) (Math.log10(theBytes) / Math.log10(1024));
034                digitGroups = Math.min(digitGroups, UNITS.length - 1);
035                return new DecimalFormat("###0.#").format(theBytes / Math.pow(1024, digitGroups)) + " " + UNITS[digitGroups];
036        }
037
038}