org.apache.hadoop.hive.serde2.io.DoubleWritable Maven / Gradle / Ivy
/**
* 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.
*/
/**
* This file is back-ported from hadoop-0.19, to make sure hive can run
* with hadoop-0.17.
*/
package org.apache.hadoop.hive.serde2.io;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.WritableComparator;
/**
* Writable for Double values.
*/
public class DoubleWritable implements WritableComparable {
private double value = 0.0;
public DoubleWritable() {
}
public DoubleWritable(double value) {
set(value);
}
public void readFields(DataInput in) throws IOException {
value = in.readDouble();
}
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 o is a DoubleWritable with the same value.
*/
@Override
public boolean equals(Object o) {
if (!(o instanceof DoubleWritable)) {
return false;
}
DoubleWritable other = (DoubleWritable) o;
return value == other.value;
}
@Override
public int hashCode() {
long v = Double.doubleToLongBits(value);
return (int) (v ^ (v >>> 32));
}
public int compareTo(Object o) {
DoubleWritable other = (DoubleWritable) o;
return (value < other.value ? -1 : (value == other.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());
}
}