org.apache.parquet.thrift.pig.TupleToThriftWriteSupport.java Source code

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Here is the source code for org.apache.parquet.thrift.pig.TupleToThriftWriteSupport.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 org.apache.parquet.thrift.pig;

import org.apache.hadoop.conf.Configuration;
import org.apache.pig.data.Tuple;
import org.apache.thrift.TBase;

import org.apache.parquet.hadoop.BadConfigurationException;
import org.apache.parquet.hadoop.api.WriteSupport;
import org.apache.parquet.hadoop.thrift.ThriftWriteSupport;
import org.apache.parquet.io.api.RecordConsumer;

import com.twitter.elephantbird.pig.util.PigToThrift;

/**
 * Stores Pig tuples as Thrift objects
 *
 * @author Julien Le Dem
 *
 */
public class TupleToThriftWriteSupport extends WriteSupport<Tuple> {

    private final String className;
    private ThriftWriteSupport<TBase<?, ?>> thriftWriteSupport;
    private PigToThrift<TBase<?, ?>> pigToThrift;

    /**
     * @param className the thrift class name
     */
    public TupleToThriftWriteSupport(String className) {
        super();
        this.className = className;
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    @Override
    public WriteContext init(Configuration configuration) {
        try {
            Class<?> clazz = configuration.getClassByName(className).asSubclass(TBase.class);
            thriftWriteSupport = new ThriftWriteSupport(clazz);
            pigToThrift = new PigToThrift(clazz);
            return thriftWriteSupport.init(configuration);
        } catch (ClassNotFoundException e) {
            throw new BadConfigurationException("The thrift class name was not found: " + className, e);
        } catch (ClassCastException e) {
            throw new BadConfigurationException("The thrift class name should extend TBase: " + className, e);
        }
    }

    @Override
    public void prepareForWrite(RecordConsumer recordConsumer) {
        thriftWriteSupport.prepareForWrite(recordConsumer);
    }

    @Override
    public void write(Tuple t) {
        thriftWriteSupport.write(pigToThrift.getThriftObject(t));
    }

}