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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 com.twitter.elephantbird.pig.util.PigToThrift;
import org.apache.hadoop.conf.Configuration;
import org.apache.parquet.conf.HadoopParquetConfiguration;
import org.apache.parquet.conf.ParquetConfiguration;
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 org.apache.pig.data.Tuple;
import org.apache.thrift.TBase;

/**
 * Stores Pig tuples as Thrift objects
 */
public class TupleToThriftWriteSupport extends WriteSupport {

  private final String className;
  private ThriftWriteSupport> thriftWriteSupport;
  private PigToThrift> pigToThrift;

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

  @Override
  public String getName() {
    return "thrift";
  }

  @Override
  public WriteContext init(Configuration configuration) {
    return init(new HadoopParquetConfiguration(configuration));
  }

  @SuppressWarnings({"rawtypes", "unchecked"})
  @Override
  public WriteContext init(ParquetConfiguration 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));
  }
}