hadoop BooleanSplitter 源码
haddop BooleanSplitter 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/db/BooleanSplitter.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.mapreduce.lib.db;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.InputSplit;
/**
* Implement DBSplitter over boolean values.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class BooleanSplitter implements DBSplitter {
public List<InputSplit> split(Configuration conf, ResultSet results, String colName)
throws SQLException {
List<InputSplit> splits = new ArrayList<InputSplit>();
if (results.getString(1) == null && results.getString(2) == null) {
// Range is null to null. Return a null split accordingly.
splits.add(new DataDrivenDBInputFormat.DataDrivenDBInputSplit(
colName + " IS NULL", colName + " IS NULL"));
return splits;
}
boolean minVal = results.getBoolean(1);
boolean maxVal = results.getBoolean(2);
// Use one or two splits.
if (!minVal) {
splits.add(new DataDrivenDBInputFormat.DataDrivenDBInputSplit(
colName + " = FALSE", colName + " = FALSE"));
}
if (maxVal) {
splits.add(new DataDrivenDBInputFormat.DataDrivenDBInputSplit(
colName + " = TRUE", colName + " = TRUE"));
}
if (results.getString(1) == null || results.getString(2) == null) {
// Include a null value.
splits.add(new DataDrivenDBInputFormat.DataDrivenDBInputSplit(
colName + " IS NULL", colName + " IS NULL"));
}
return splits;
}
}
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