content: /*
   * 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.asterix.external.input.record.reader.hdfs.parquet;
  
  import java.io.IOException;
  import java.security.PrivilegedExceptionAction;
  
  import org.apache.asterix.external.api.IExternalDataRuntimeContext;
  import org.apache.asterix.external.input.record.ValueReferenceRecord;
  import org.apache.asterix.external.input.record.reader.hdfs.AbstractHDFSRecordReader;
  import org.apache.asterix.external.util.HDFSUtils;
  import org.apache.hadoop.mapred.InputSplit;
  import org.apache.hadoop.mapred.JobConf;
  import org.apache.hadoop.mapred.RecordReader;
  import org.apache.hadoop.mapred.Reporter;
  import org.apache.hadoop.security.UserGroupInformation;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.exceptions.IWarningCollector;
  import org.apache.hyracks.data.std.api.IValueReference;
  
  /**
   * Apache Parquet record reader.
   * The reader returns records in ADM format.
   */
  public class ParquetFileRecordReader<V extends IValueReference> extends AbstractHDFSRecordReader<Void, V> {
      private final IWarningCollector warningCollector;
  
      public ParquetFileRecordReader(boolean[] read, InputSplit[] inputSplits, String[] readSchedule, String nodeName,
              JobConf conf, IExternalDataRuntimeContext context, UserGroupInformation ugi) {
          super(read, inputSplits, readSchedule, nodeName, new ValueReferenceRecord<>(), conf, ugi);
          this.warningCollector = context.getTaskContext().getWarningCollector();
          ((MapredParquetInputFormat) inputFormat).setValueEmbedder(context.getValueEmbedder());
      }
  
      @Override
      protected boolean onNextInputSplit() throws IOException {
          return false;
      }
  
      @Override
      public void close() throws IOException {
          super.close();
          //Issue warning if any was reported
          HDFSUtils.issueWarnings(warningCollector, conf);
      }
  
      @SuppressWarnings("unchecked")
      @Override
      protected void setRecordReader(int splitIndex) throws IOException {
          try {
              ParquetRecordReaderWrapper readerWrapper = ugi == null ? getReader(splitIndex)
                      : ugi.doAs((PrivilegedExceptionAction<ParquetRecordReaderWrapper>) () -> getReader(splitIndex));
              reader = (RecordReader<Void, V>) readerWrapper;
          } catch (AsterixParquetRuntimeException e) {
              throw e.getHyracksDataException();
          } catch (InterruptedException e) {
              throw HyracksDataException.create(e);
          }
          if (value == null) {
              value = reader.createValue();
          }
      }
  
      private ParquetRecordReaderWrapper getReader(int splitIndex) throws IOException {
          return (ParquetRecordReaderWrapper) inputFormat.getRecordReader(inputSplits[splitIndex], conf, Reporter.NULL);
      }
  }
  