| /** |
| * 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; |
| |
| /** A WritableComparable for longs. */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class LongWritable implements WritableComparable<LongWritable> { |
| private long value; |
| |
| public LongWritable() {} |
| |
| public LongWritable(long value) { set(value); } |
| |
| /** Set the value of this LongWritable. */ |
| public void set(long value) { this.value = value; } |
| |
| /** Return the value of this LongWritable. */ |
| public long get() { return value; } |
| |
| @Override |
| public void readFields(DataInput in) throws IOException { |
| value = in.readLong(); |
| } |
| |
| @Override |
| public void write(DataOutput out) throws IOException { |
| out.writeLong(value); |
| } |
| |
| /** Returns true iff <code>o</code> is a LongWritable with the same value. */ |
| @Override |
| public boolean equals(Object o) { |
| if (!(o instanceof LongWritable)) |
| return false; |
| LongWritable other = (LongWritable)o; |
| return this.value == other.value; |
| } |
| |
| @Override |
| public int hashCode() { |
| return (int)value; |
| } |
| |
| /** Compares two LongWritables. */ |
| @Override |
| public int compareTo(LongWritable o) { |
| long thisValue = this.value; |
| long thatValue = o.value; |
| return (thisValue<thatValue ? -1 : (thisValue==thatValue ? 0 : 1)); |
| } |
| |
| @Override |
| public String toString() { |
| return Long.toString(value); |
| } |
| |
| /** A Comparator optimized for LongWritable. */ |
| public static class Comparator extends WritableComparator { |
| public Comparator() { |
| super(LongWritable.class); |
| } |
| |
| @Override |
| public int compare(byte[] b1, int s1, int l1, |
| byte[] b2, int s2, int l2) { |
| long thisValue = readLong(b1, s1); |
| long thatValue = readLong(b2, s2); |
| return (thisValue<thatValue ? -1 : (thisValue==thatValue ? 0 : 1)); |
| } |
| } |
| |
| /** A decreasing Comparator optimized for LongWritable. */ |
| public static class DecreasingComparator extends Comparator { |
| |
| @Override |
| public int compare(WritableComparable a, WritableComparable b) { |
| return super.compare(b, a); |
| } |
| @Override |
| public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) { |
| return super.compare(b2, s2, l2, b1, s1, l1); |
| } |
| } |
| |
| static { // register default comparator |
| WritableComparator.define(LongWritable.class, new Comparator()); |
| } |
| |
| } |
| |