VLongWritable.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 longs in a variable-length format. Such values take
- * between one and five bytes. Smaller values take fewer bytes.
- *
- * @see org.apache.hadoop.io.WritableUtils#readVLong(DataInput)
- */
- public class VLongWritable implements WritableComparable {
- private long value;
- public VLongWritable() {}
- public VLongWritable(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; }
- public void readFields(DataInput in) throws IOException {
- value = WritableUtils.readVLong(in);
- }
- public void write(DataOutput out) throws IOException {
- WritableUtils.writeVLong(out, value);
- }
- /** Returns true iff <code>o</code> is a VLongWritable with the same value. */
- public boolean equals(Object o) {
- if (!(o instanceof VLongWritable))
- return false;
- VLongWritable other = (VLongWritable)o;
- return this.value == other.value;
- }
- public int hashCode() {
- return (int)value;
- }
- /** Compares two VLongWritables. */
- public int compareTo(Object o) {
- long thisValue = this.value;
- long thatValue = ((VLongWritable)o).value;
- return (thisValue < thatValue ? -1 : (thisValue == thatValue ? 0 : 1));
- }
- public String toString() {
- return Long.toString(value);
- }
- }