hadoop BooleanWritable 源码
haddop BooleanWritable 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/BooleanWritable.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 booleans.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class BooleanWritable implements WritableComparable<BooleanWritable> {
private boolean value;
/**
*/
public BooleanWritable() {};
/**
* @param value value.
*/
public BooleanWritable(boolean value) {
set(value);
}
/**
* Set the value of the BooleanWritable.
* @param value value.
*/
public void set(boolean value) {
this.value = value;
}
/**
* Returns the value of the BooleanWritable.
* @return the value of the BooleanWritable.
*/
public boolean get() {
return value;
}
/**
*/
@Override
public void readFields(DataInput in) throws IOException {
value = in.readBoolean();
}
/**
*/
@Override
public void write(DataOutput out) throws IOException {
out.writeBoolean(value);
}
/**
*/
@Override
public boolean equals(Object o) {
if (!(o instanceof BooleanWritable)) {
return false;
}
BooleanWritable other = (BooleanWritable) o;
return this.value == other.value;
}
@Override
public int hashCode() {
return value ? 0 : 1;
}
/**
*/
@Override
public int compareTo(BooleanWritable o) {
boolean a = this.value;
boolean b = o.value;
return ((a == b) ? 0 : (a == false) ? -1 : 1);
}
@Override
public String toString() {
return Boolean.toString(get());
}
/**
* A Comparator optimized for BooleanWritable.
*/
public static class Comparator extends WritableComparator {
public Comparator() {
super(BooleanWritable.class);
}
@Override
public int compare(byte[] b1, int s1, int l1,
byte[] b2, int s2, int l2) {
return compareBytes(b1, s1, l1, b2, s2, l2);
}
}
static {
WritableComparator.define(BooleanWritable.class, new Comparator());
}
}
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