| /** |
| * 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.io; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| /** |
| * Writable for Double values. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class DoubleWritable implements WritableComparable<DoubleWritable> { |
| |
| private double value = 0.0; |
| |
| public DoubleWritable() { |
| |
| } |
| |
| public DoubleWritable(double value) { |
| set(value); |
| } |
| |
| @Override |
| public void readFields(DataInput in) throws IOException { |
| value = in.readDouble(); |
| } |
| |
| @Override |
| public void write(DataOutput out) throws IOException { |
| out.writeDouble(value); |
| } |
| |
| public void set(double value) { this.value = value; } |
| |
| public double get() { return value; } |
| |
| /** |
| * Returns true iff <code>o</code> is a DoubleWritable with the same value. |
| */ |
| @Override |
| public boolean equals(Object o) { |
| if (!(o instanceof DoubleWritable)) { |
| return false; |
| } |
| DoubleWritable other = (DoubleWritable)o; |
| return this.value == other.value; |
| } |
| |
| @Override |
| public int hashCode() { |
| return (int)Double.doubleToLongBits(value); |
| } |
| |
| @Override |
| public int compareTo(DoubleWritable o) { |
| return (value < o.value ? -1 : (value == o.value ? 0 : 1)); |
| } |
| |
| @Override |
| public String toString() { |
| return Double.toString(value); |
| } |
| |
| /** A Comparator optimized for DoubleWritable. */ |
| public static class Comparator extends WritableComparator { |
| public Comparator() { |
| super(DoubleWritable.class); |
| } |
| |
| @Override |
| public int compare(byte[] b1, int s1, int l1, |
| byte[] b2, int s2, int l2) { |
| double thisValue = readDouble(b1, s1); |
| double thatValue = readDouble(b2, s2); |
| return (thisValue < thatValue ? -1 : (thisValue == thatValue ? 0 : 1)); |
| } |
| } |
| |
| static { // register this comparator |
| WritableComparator.define(DoubleWritable.class, new Comparator()); |
| } |
| |
| } |
| |