[120] | 1 | /** |
---|
| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
---|
| 3 | * or more contributor license agreements. See the NOTICE file |
---|
| 4 | * distributed with this work for additional information |
---|
| 5 | * regarding copyright ownership. The ASF licenses this file |
---|
| 6 | * to you under the Apache License, Version 2.0 (the |
---|
| 7 | * "License"); you may not use this file except in compliance |
---|
| 8 | * with the License. You may obtain a copy of the License at |
---|
| 9 | * |
---|
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
---|
| 11 | * |
---|
| 12 | * Unless required by applicable law or agreed to in writing, software |
---|
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
---|
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
---|
| 15 | * See the License for the specific language governing permissions and |
---|
| 16 | * limitations under the License. |
---|
| 17 | */ |
---|
| 18 | |
---|
| 19 | package org.apache.hadoop.io; |
---|
| 20 | |
---|
| 21 | import java.io.*; |
---|
| 22 | |
---|
| 23 | /** A WritableComparable for longs. */ |
---|
| 24 | public class LongWritable implements WritableComparable { |
---|
| 25 | private long value; |
---|
| 26 | |
---|
| 27 | public LongWritable() {} |
---|
| 28 | |
---|
| 29 | public LongWritable(long value) { set(value); } |
---|
| 30 | |
---|
| 31 | /** Set the value of this LongWritable. */ |
---|
| 32 | public void set(long value) { this.value = value; } |
---|
| 33 | |
---|
| 34 | /** Return the value of this LongWritable. */ |
---|
| 35 | public long get() { return value; } |
---|
| 36 | |
---|
| 37 | public void readFields(DataInput in) throws IOException { |
---|
| 38 | value = in.readLong(); |
---|
| 39 | } |
---|
| 40 | |
---|
| 41 | public void write(DataOutput out) throws IOException { |
---|
| 42 | out.writeLong(value); |
---|
| 43 | } |
---|
| 44 | |
---|
| 45 | /** Returns true iff <code>o</code> is a LongWritable with the same value. */ |
---|
| 46 | public boolean equals(Object o) { |
---|
| 47 | if (!(o instanceof LongWritable)) |
---|
| 48 | return false; |
---|
| 49 | LongWritable other = (LongWritable)o; |
---|
| 50 | return this.value == other.value; |
---|
| 51 | } |
---|
| 52 | |
---|
| 53 | public int hashCode() { |
---|
| 54 | return (int)value; |
---|
| 55 | } |
---|
| 56 | |
---|
| 57 | /** Compares two LongWritables. */ |
---|
| 58 | public int compareTo(Object o) { |
---|
| 59 | long thisValue = this.value; |
---|
| 60 | long thatValue = ((LongWritable)o).value; |
---|
| 61 | return (thisValue<thatValue ? -1 : (thisValue==thatValue ? 0 : 1)); |
---|
| 62 | } |
---|
| 63 | |
---|
| 64 | public String toString() { |
---|
| 65 | return Long.toString(value); |
---|
| 66 | } |
---|
| 67 | |
---|
| 68 | /** A Comparator optimized for LongWritable. */ |
---|
| 69 | public static class Comparator extends WritableComparator { |
---|
| 70 | public Comparator() { |
---|
| 71 | super(LongWritable.class); |
---|
| 72 | } |
---|
| 73 | |
---|
| 74 | public int compare(byte[] b1, int s1, int l1, |
---|
| 75 | byte[] b2, int s2, int l2) { |
---|
| 76 | long thisValue = readLong(b1, s1); |
---|
| 77 | long thatValue = readLong(b2, s2); |
---|
| 78 | return (thisValue<thatValue ? -1 : (thisValue==thatValue ? 0 : 1)); |
---|
| 79 | } |
---|
| 80 | } |
---|
| 81 | |
---|
| 82 | /** A decreasing Comparator optimized for LongWritable. */ |
---|
| 83 | public static class DecreasingComparator extends Comparator { |
---|
| 84 | public int compare(WritableComparable a, WritableComparable b) { |
---|
| 85 | return -super.compare(a, b); |
---|
| 86 | } |
---|
| 87 | public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) { |
---|
| 88 | return -super.compare(b1, s1, l1, b2, s2, l2); |
---|
| 89 | } |
---|
| 90 | } |
---|
| 91 | |
---|
| 92 | static { // register default comparator |
---|
| 93 | WritableComparator.define(LongWritable.class, new Comparator()); |
---|
| 94 | } |
---|
| 95 | |
---|
| 96 | } |
---|
| 97 | |
---|