org.apache.hadoop.io.DoubleWritable.java Source code

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Here is the source code for org.apache.hadoop.io.DoubleWritable.java

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/**
 * 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());
    }

}