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 com.actiontech.dble.memory.unsafe.utils;
  
  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;
  }
  