com.ebay.nest.io.sede.thrift.ThriftDeserializer.java Source code

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Here is the source code for com.ebay.nest.io.sede.thrift.ThriftDeserializer.java

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/**
 * 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 com.ebay.nest.io.sede.thrift;

import java.util.Properties;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Writable;
import org.apache.thrift.protocol.TProtocolFactory;

import com.ebay.nest.io.sede.AbstractDeserializer;
import com.ebay.nest.io.sede.SerDeException;
import com.ebay.nest.io.sede.SerDeStats;
import com.ebay.nest.io.sede.serdeConstants;
import com.ebay.nest.io.sede.objectinspector.ObjectInspector;

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(serdeConstants.SERIALIZATION_CLASS);
            Class<?> recordClass = job.getClassByName(className);

            String protoName = tbl.getProperty(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;
    }
}