org.apache.hadoop.hive.serde2.DefaultFetchFormatter Maven / Gradle / Ivy
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* 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,
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package org.apache.hadoop.hive.serde2;
import java.io.IOException;
import java.util.Properties;
import static org.apache.hadoop.hive.serde.serdeConstants.SERIALIZATION_FORMAT;
import static org.apache.hadoop.hive.serde.serdeConstants.SERIALIZATION_NULL_FORMAT;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.common.JavaUtils;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hive.common.util.ReflectionUtil;
/**
* serialize row by user specified serde and call toString() to make string type result
*/
public class DefaultFetchFormatter implements FetchFormatter {
private AbstractSerDe mSerde;
@Override
public void initialize(Configuration hconf, Properties props) throws SerDeException {
mSerde = initializeSerde(hconf, props);
}
private AbstractSerDe initializeSerde(Configuration conf, Properties props) throws SerDeException {
String serdeName = HiveConf.getVar(conf, HiveConf.ConfVars.HIVEFETCHOUTPUTSERDE);
Class serdeClass;
try {
serdeClass =
Class.forName(serdeName, true, JavaUtils.getClassLoader()).asSubclass(AbstractSerDe.class);
} catch (ClassNotFoundException e) {
throw new SerDeException(e);
}
// cast only needed for Hadoop 0.17 compatibility
AbstractSerDe serde = ReflectionUtil.newInstance(serdeClass, null);
Properties serdeProps = new Properties();
if (serde instanceof DelimitedJSONSerDe) {
serdeProps.put(SERIALIZATION_FORMAT, props.getProperty(SERIALIZATION_FORMAT));
serdeProps.put(SERIALIZATION_NULL_FORMAT, props.getProperty(SERIALIZATION_NULL_FORMAT));
}
SerDeUtils.initializeSerDe(serde, conf, serdeProps, null);
return serde;
}
@Override
public String convert(Object row, ObjectInspector rowOI) throws Exception {
return mSerde.serialize(row, rowOI).toString();
}
@Override
public void close() throws IOException {
}
}