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

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Here is the source code for org.apache.hadoop.io.FloatWritable.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.*;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

/** A WritableComparable for floats. */
@InterfaceAudience.Public
@InterfaceStability.Stable
public class FloatWritable implements WritableComparable<FloatWritable> {
    private float value;

    public FloatWritable() {
    }

    public FloatWritable(float value) {
        set(value);
    }

    /** Set the value of this FloatWritable. */
    public void set(float value) {
        this.value = value;
    }

    /** Return the value of this FloatWritable. */
    public float get() {
        return value;
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        value = in.readFloat();
    }

    @Override
    public void write(DataOutput out) throws IOException {
        out.writeFloat(value);
    }

    /** Returns true iff <code>o</code> is a FloatWritable with the same value. */
    @Override
    public boolean equals(Object o) {
        if (!(o instanceof FloatWritable))
            return false;
        FloatWritable other = (FloatWritable) o;
        return this.value == other.value;
    }

    @Override
    public int hashCode() {
        return Float.floatToIntBits(value);
    }

    /** Compares two FloatWritables. */
    @Override
    public int compareTo(FloatWritable o) {
        return Float.compare(value, o.value);
    }

    @Override
    public String toString() {
        return Float.toString(value);
    }

    /** A Comparator optimized for FloatWritable. */
    public static class Comparator extends WritableComparator {
        public Comparator() {
            super(FloatWritable.class);
        }

        @Override
        public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) {
            float thisValue = readFloat(b1, s1);
            float thatValue = readFloat(b2, s2);
            return Float.compare(thisValue, thatValue);
        }
    }

    static { // register this comparator
        WritableComparator.define(FloatWritable.class, new Comparator());
    }

}