ByteWritable.java
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上传日期:2018-01-08
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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.*;
- /** A WritableComparable for a single byte. */
- public class ByteWritable implements WritableComparable {
- private byte value;
- public ByteWritable() {}
- public ByteWritable(byte value) { set(value); }
- /** Set the value of this ByteWritable. */
- public void set(byte value) { this.value = value; }
- /** Return the value of this ByteWritable. */
- public byte get() { return value; }
- public void readFields(DataInput in) throws IOException {
- value = in.readByte();
- }
- public void write(DataOutput out) throws IOException {
- out.writeByte(value);
- }
- /** Returns true iff <code>o</code> is a ByteWritable with the same value. */
- public boolean equals(Object o) {
- if (!(o instanceof ByteWritable)) {
- return false;
- }
- ByteWritable other = (ByteWritable)o;
- return this.value == other.value;
- }
- public int hashCode() {
- return (int)value;
- }
- /** Compares two ByteWritables. */
- public int compareTo(Object o) {
- int thisValue = this.value;
- int thatValue = ((ByteWritable)o).value;
- return (thisValue < thatValue ? -1 : (thisValue == thatValue ? 0 : 1));
- }
- public String toString() {
- return Byte.toString(value);
- }
- /** A Comparator optimized for ByteWritable. */
- public static class Comparator extends WritableComparator {
- public Comparator() {
- super(ByteWritable.class);
- }
- 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());
- }
- }