| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.iotdb.tsfile.utils; |
| |
| import org.apache.iotdb.tsfile.fileSystem.FSFactoryProducer; |
| |
| import java.io.File; |
| |
| /** |
| * FileUtils is just used for return file attribute like file size, and contains some measurement |
| * conversion among B, KB, MB etc. |
| */ |
| public class FileUtils { |
| |
| public static double getLocalFileByte(String filePath, Unit unit) { |
| File f = FSFactoryProducer.getFSFactory().getFile(filePath); |
| return getLocalFileByte(f, unit); |
| } |
| |
| public static double getLocalFileByte(File file, Unit unit) { |
| return format(transformUnit(file.length(), unit), 2); |
| } |
| |
| /** |
| * transform the byte value number to another unit. |
| * |
| * @param value - a number represented Byte which to be transformed |
| * @param unit - the target unit to be transformed |
| * @return - value number in unit of given parameter |
| */ |
| public static double transformUnit(double value, Unit unit) { |
| return value / Math.pow(1024, unit.ordinal()); |
| } |
| |
| /** |
| * transform the value number from other unit to Byte unit. |
| * |
| * @param value - a number to be transformed |
| * @param unit - the source unit to be transformed, maybe in unit of KB, MB, GB |
| * @return - value number in unit of Byte |
| */ |
| public static double transformUnitToByte(double value, Unit unit) { |
| return value * Math.pow(1024, unit.ordinal()); |
| } |
| |
| /** |
| * reserves some decimal for given double value |
| * |
| * @param num - given double value |
| * @param round - reserved decimal number |
| * @return - double value in given decimal number |
| */ |
| public static double format(double num, int round) { |
| long a = (long) (num * Math.pow(10, round)); |
| return ((double) a) / Math.pow(10, round); |
| } |
| |
| public enum Unit { |
| B, |
| KB, |
| MB, |
| GB, |
| TB, |
| PB, |
| EB |
| } |
| } |