| /** |
| * Copyright The Apache Software Foundation |
| * 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.hadoop.hbase; |
| |
| import java.math.BigDecimal; |
| import java.util.Objects; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| import org.apache.hbase.thirdparty.com.google.common.base.Preconditions; |
| |
| /** |
| * It is used to represent the size with different units. |
| * This class doesn't serve for the precise computation. |
| */ |
| @InterfaceAudience.Public |
| public final class Size implements Comparable<Size> { |
| public static final Size ZERO = new Size(0, Unit.KILOBYTE); |
| private static final BigDecimal SCALE_BASE = BigDecimal.valueOf(1024D); |
| |
| public enum Unit { |
| // keep the room to add more units for HBase 10.x |
| PETABYTE(100, "PB"), |
| TERABYTE(99, "TB"), |
| GIGABYTE(98, "GB"), |
| MEGABYTE(97, "MB"), |
| KILOBYTE(96, "KB"), |
| BYTE(95, "B"); |
| private final int orderOfSize; |
| private final String simpleName; |
| |
| Unit(int orderOfSize, String simpleName) { |
| this.orderOfSize = orderOfSize; |
| this.simpleName = simpleName; |
| } |
| |
| public int getOrderOfSize() { |
| return orderOfSize; |
| } |
| |
| public String getSimpleName() { |
| return simpleName; |
| } |
| } |
| |
| private final double value; |
| private final Unit unit; |
| |
| public Size(double value, Unit unit) { |
| if (value < 0) { |
| throw new IllegalArgumentException("The value:" + value + " can't be negative"); |
| } |
| this.value = value; |
| this.unit = Preconditions.checkNotNull(unit); |
| } |
| |
| /** |
| * @return size unit |
| */ |
| public Unit getUnit() { |
| return unit; |
| } |
| |
| /** |
| * get the value |
| */ |
| public long getLongValue() { |
| return (long) value; |
| } |
| |
| /** |
| * get the value |
| */ |
| public double get() { |
| return value; |
| } |
| |
| /** |
| * get the value which is converted to specified unit. |
| * |
| * @param unit size unit |
| * @return the converted value |
| */ |
| public double get(Unit unit) { |
| if (value == 0) { |
| return value; |
| } |
| int diff = this.unit.getOrderOfSize() - unit.getOrderOfSize(); |
| if (diff == 0) { |
| return value; |
| } |
| |
| BigDecimal rval = BigDecimal.valueOf(value); |
| for (int i = 0; i != Math.abs(diff); ++i) { |
| rval = diff > 0 ? rval.multiply(SCALE_BASE) : rval.divide(SCALE_BASE); |
| } |
| return rval.doubleValue(); |
| } |
| |
| @Override |
| public int compareTo(Size other) { |
| int diff = unit.getOrderOfSize() - other.unit.getOrderOfSize(); |
| if (diff == 0) { |
| return Double.compare(value, other.value); |
| } |
| |
| BigDecimal thisValue = BigDecimal.valueOf(value); |
| BigDecimal otherValue = BigDecimal.valueOf(other.value); |
| if (diff > 0) { |
| for (int i = 0; i != Math.abs(diff); ++i) { |
| thisValue = thisValue.multiply(SCALE_BASE); |
| } |
| } else { |
| for (int i = 0; i != Math.abs(diff); ++i) { |
| otherValue = otherValue.multiply(SCALE_BASE); |
| } |
| } |
| return thisValue.compareTo(otherValue); |
| } |
| |
| @Override |
| public String toString() { |
| return value + unit.getSimpleName(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == null) { |
| return false; |
| } |
| if (obj == this) { |
| return true; |
| } |
| if (obj instanceof Size) { |
| return compareTo((Size)obj) == 0; |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(value, unit); |
| } |
| } |