hadoop VLongWritable 源码
haddop VLongWritable 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/VLongWritable.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 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)
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class VLongWritable implements WritableComparable<VLongWritable> {
private long value;
public VLongWritable() {}
public VLongWritable(long value) { set(value); }
/**
* Set the value of this LongWritable.
* @param value input value.
*/
public void set(long value) { this.value = value; }
/** @return Return the value of this LongWritable. */
public long get() { return value; }
@Override
public void readFields(DataInput in) throws IOException {
value = WritableUtils.readVLong(in);
}
@Override
public void write(DataOutput out) throws IOException {
WritableUtils.writeVLong(out, value);
}
/** Returns true iff <code>o</code> is a VLongWritable with the same value. */
@Override
public boolean equals(Object o) {
if (!(o instanceof VLongWritable))
return false;
VLongWritable other = (VLongWritable)o;
return this.value == other.value;
}
@Override
public int hashCode() {
return (int)value;
}
/** Compares two VLongWritables. */
@Override
public int compareTo(VLongWritable 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);
}
}
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