org.apache.hadoop.hive.serde2.thrift.ThriftDeserializer Maven / Gradle / Ivy
/**
* 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.serde2.thrift;
import java.util.Properties;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.serde2.AbstractDeserializer;
import org.apache.hadoop.hive.serde2.SerDeException;
import org.apache.hadoop.hive.serde2.SerDeStats;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.io.Writable;
import org.apache.thrift.protocol.TProtocolFactory;
/**
* ThriftDeserializer.
*
*/
public class ThriftDeserializer extends AbstractDeserializer {
private ThriftByteStreamTypedSerDe tsd;
public ThriftDeserializer() {
}
@Override
public void initialize(Configuration job, Properties tbl)
throws SerDeException {
try {
// both the classname and the protocol name are Table properties
// the only hardwired assumption is that records are fixed on a
// per Table basis
String className = tbl
.getProperty(org.apache.hadoop.hive.serde.serdeConstants.SERIALIZATION_CLASS);
Class recordClass = job.getClassByName(className);
String protoName = tbl
.getProperty(org.apache.hadoop.hive.serde.serdeConstants.SERIALIZATION_FORMAT);
if (protoName == null) {
protoName = "TBinaryProtocol";
}
// For backward compatibility
protoName = protoName.replace("com.facebook.thrift.protocol",
"org.apache.thrift.protocol");
TProtocolFactory tp = TReflectionUtils
.getProtocolFactoryByName(protoName);
tsd = new ThriftByteStreamTypedSerDe(recordClass, tp, tp);
} catch (Exception e) {
throw new SerDeException(e);
}
}
@Override
public Object deserialize(Writable field) throws SerDeException {
return tsd.deserialize(field);
}
@Override
public ObjectInspector getObjectInspector() throws SerDeException {
return tsd.getObjectInspector();
}
@Override
public SerDeStats getSerDeStats() {
// no support for statistics
return null;
}
}