hadoop DoubleWritable 源码
haddop DoubleWritable 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/DoubleWritable.java
/**
* 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 Double.compare(value, o.value);
}
@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 Double.compare(thisValue, thatValue);
}
}
static { // register this comparator
WritableComparator.define(DoubleWritable.class, new Comparator());
}
}
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