content: /*
   * 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.spark.network.util;
  
  public enum ByteUnit {
    BYTE (1),
    KiB (1024L),
    MiB ((long) Math.pow(1024L, 2L)),
    GiB ((long) Math.pow(1024L, 3L)),
    TiB ((long) Math.pow(1024L, 4L)),
    PiB ((long) Math.pow(1024L, 5L));
  
    ByteUnit(long multiplier) {
      this.multiplier = multiplier;
    }
  
    // Interpret the provided number (d) with suffix (u) as this unit type.
    // E.g. KiB.interpret(1, MiB) interprets 1MiB as its KiB representation = 1024k
    public long convertFrom(long d, ByteUnit u) {
      return u.convertTo(d, this);
    }
  
    // Convert the provided number (d) interpreted as this unit type to unit type (u).
    public long convertTo(long d, ByteUnit u) {
      if (multiplier > u.multiplier) {
        long ratio = multiplier / u.multiplier;
        if (Long.MAX_VALUE / ratio < d) {
          throw new IllegalArgumentException("Conversion of " + d + " exceeds Long.MAX_VALUE in "
            + name() + ". Try a larger unit (e.g. MiB instead of KiB)");
        }
        return d * ratio;
      } else {
        // Perform operations in this order to avoid potential overflow
        // when computing d * multiplier
        return d / (u.multiplier / multiplier);
      }
    }
  
    public double toBytes(long d) {
      if (d < 0) {
        throw new IllegalArgumentException("Negative size value. Size must be positive: " + d);
      }
      return d * multiplier;
    }
  
    public long toKiB(long d) { return convertTo(d, KiB); }
    public long toMiB(long d) { return convertTo(d, MiB); }
    public long toGiB(long d) { return convertTo(d, GiB); }
    public long toTiB(long d) { return convertTo(d, TiB); }
    public long toPiB(long d) { return convertTo(d, PiB); }
  
    private final long multiplier;
  }
  