/**
* 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.hive.ql.exec;
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.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.DelimitedJSONSerDe;
import org.apache.hadoop.hive.serde2.SerDe;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.util.ReflectionUtils;
/**
* serialize row by user specified serde and call toString() to make string type result
*/
public class DefaultFetchFormatter<T> implements FetchFormatter<String> {
private SerDe mSerde;
@Override
public void initialize(Configuration hconf, Properties props) throws HiveException {
try {
mSerde = initializeSerde(hconf, props);
} catch (Exception e) {
throw new HiveException(e);
}
}
private SerDe initializeSerde(Configuration conf, Properties props) throws Exception {
String serdeName = HiveConf.getVar(conf, HiveConf.ConfVars.HIVEFETCHOUTPUTSERDE);
Class<? extends SerDe> serdeClass = Class.forName(serdeName, true,
JavaUtils.getClassLoader()).asSubclass(SerDe.class);
// cast only needed for Hadoop 0.17 compatibility
SerDe serde = ReflectionUtils.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));
}
serde.initialize(conf, serdeProps);
return serde;
}
@Override
public String convert(Object row, ObjectInspector rowOI) throws Exception {
return mSerde.serialize(row, rowOI).toString();
}
@Override
public void close() throws IOException {
}
}