parquet-cascading/src/main/java/parquet/cascading/ParquetTBaseScheme.java

/**
 * Copyright 2012 Twitter, Inc.
 *
 * Licensed 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 parquet.cascading;

import java.io.IOException;

import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.thrift.TBase;

import parquet.hadoop.ParquetInputFormat;
import parquet.hadoop.mapred.DeprecatedParquetInputFormat;
import parquet.hadoop.thrift.ThriftReadSupport;
import parquet.thrift.ThriftRecordConverter;
import cascading.flow.FlowProcess;
import cascading.scheme.SinkCall;
import cascading.tap.Tap;

public class ParquetTBaseScheme<T extends TBase> extends ParquetValueScheme<T> {

  @SuppressWarnings("rawtypes")
  @Override
  public void sinkConfInit(FlowProcess<JobConf> arg0,
      Tap<JobConf, RecordReader, OutputCollector> arg1, JobConf arg2) {
    throw new UnsupportedOperationException("ParquetTBaseScheme does not support Sinks");

  }

  /**
   * TODO: currently we cannot write Parquet files from TBase objects.
   * All the underlying stuff exists, just need to link it.
   */
  @Override
  public boolean isSink() { return false; }


  @SuppressWarnings("rawtypes")
  @Override
  public void sourceConfInit(FlowProcess<JobConf> fp,
      Tap<JobConf, RecordReader, OutputCollector> tap, JobConf jobConf) {
    jobConf.setInputFormat(DeprecatedParquetInputFormat.class);
    ParquetInputFormat.setReadSupportClass(jobConf, ThriftReadSupport.class);
    ThriftReadSupport.setRecordConverterClass(jobConf, ThriftRecordConverter.class);
  }


  @Override
  public void sink(FlowProcess<JobConf> arg0, SinkCall<Object[], OutputCollector> arg1)
      throws IOException {
    throw new UnsupportedOperationException("ParquetTBaseScheme does not support Sinks");
  }
}