hadoop ByteWritable 源码
haddop ByteWritable 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/ByteWritable.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 a single byte. */
@InterfaceAudience.Public
@InterfaceStability.Stable
public class ByteWritable implements WritableComparable<ByteWritable> {
private byte value;
public ByteWritable() {}
public ByteWritable(byte value) { set(value); }
/**
* Set the value of this ByteWritable.
* @param value value.
*/
public void set(byte value) { this.value = value; }
/**
* Return the value of this ByteWritable.
* @return value bytes.
*/
public byte get() { return value; }
@Override
public void readFields(DataInput in) throws IOException {
value = in.readByte();
}
@Override
public void write(DataOutput out) throws IOException {
out.writeByte(value);
}
/** Returns true iff <code>o</code> is a ByteWritable with the same value. */
@Override
public boolean equals(Object o) {
if (!(o instanceof ByteWritable)) {
return false;
}
ByteWritable other = (ByteWritable)o;
return this.value == other.value;
}
@Override
public int hashCode() {
return (int)value;
}
/** Compares two ByteWritables. */
@Override
public int compareTo(ByteWritable o) {
int thisValue = this.value;
int thatValue = o.value;
return (thisValue < thatValue ? -1 : (thisValue == thatValue ? 0 : 1));
}
@Override
public String toString() {
return Byte.toString(value);
}
/** A Comparator optimized for ByteWritable. */
public static class Comparator extends WritableComparator {
public Comparator() {
super(ByteWritable.class);
}
@Override
public int compare(byte[] b1, int s1, int l1,
byte[] b2, int s2, int l2) {
byte thisValue = b1[s1];
byte thatValue = b2[s2];
return (thisValue < thatValue ? -1 : (thisValue == thatValue ? 0 : 1));
}
}
static { // register this comparator
WritableComparator.define(ByteWritable.class, new Comparator());
}
}
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