xerial.core.util.DataUnit.scala Maven / Gradle / Ivy
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/*
* Copyright 2012 Taro L. Saito
*
* Licensed 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.
*/
//--------------------------------------
//
// DataUnit.scala
// Since: 2012/12/07 1:38 PM
//
//--------------------------------------
package xerial.core.util
/**
* Translators of data sizes
*
* @author Taro L. Saito
*/
object DataUnit {
/**
* Convert the given byte size into human readable format like 1024 -> 1K
* @param byteSize
* @return string representation of the byte size
*/
def toHumanReadableFormat(byteSize:Long) : String = {
// kilo, mega, giga, tera, peta, exa, zetta, yotta
val unitName = Seq("", "K", "M", "G", "T", "P", "E", "Z", "Y")
def loop(index:Int, v:Long) : (Long, String) = {
if(index >= unitName.length)
(byteSize, "")
val next = v >> 10L
if(next == 0L)
(v, unitName(index))
else
loop(index+1, next)
}
val (prefix, unit) = if(byteSize > 0)
loop(0, byteSize)
else
loop(0, -byteSize) match { case (p, u) => (-p, u)}
s"$prefix$unit"
}
// implicit class DataSize(size:Long) {
// def K = size * KB
// def M = size * MB
// def G = size * GB
// def P = size * PB
// }
// data size unit
val KB = 1L << 10
val MB = 1L << 20
val GB = 1L << 30
val PB = 1L << 40
}