hadoop FloatWritable 源码
haddop FloatWritable 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/FloatWritable.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.*;
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.
* @param value value.
*/
public void set(float value) { this.value = value; }
/**
* Return the value of this FloatWritable.
* @return value.
*/
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());
}
}
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