content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.job.plan.transform.format.orc;
  
  import alluxio.job.plan.transform.FieldSchema;
  import alluxio.job.plan.transform.HiveConstants;
  import alluxio.job.plan.transform.format.TableRow;
  import alluxio.job.plan.transform.format.csv.Decimal;
  import alluxio.job.plan.transform.format.parquet.ParquetRow;
  
  import org.apache.avro.Schema;
  import org.apache.avro.generic.GenericRecordBuilder;
  import org.apache.hadoop.hive.common.type.HiveDecimal;
  import org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector;
  import org.apache.hadoop.hive.ql.exec.vector.ColumnVector;
  import org.apache.hadoop.hive.ql.exec.vector.DecimalColumnVector;
  import org.apache.hadoop.hive.ql.exec.vector.DoubleColumnVector;
  import org.apache.hadoop.hive.ql.exec.vector.LongColumnVector;
  import org.apache.hadoop.hive.ql.exec.vector.TimestampColumnVector;
  import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
  import org.apache.hadoop.hive.ql.exec.vector.VoidColumnVector;
  
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * A row in a Orc table.
   */
  public class OrcRow implements TableRow {
    private final VectorizedRowBatch mBatch;
    private final int mPosition;
    private final Map<String, Integer> mColumnNamePosition;
  
    private final OrcSchema mSchema;
  
    /**
     * Constructor for OrcRow.
     * @param schema the schema
     * @param batch the vectorized row batch
     * @param position the row position inside the vectorized row batch
     * @param fieldNames ordered list of field names
     */
    public OrcRow(OrcSchema schema, VectorizedRowBatch batch, int position,
                  List<String> fieldNames) {
      mSchema = schema;
      mBatch = batch;
      mPosition = position;
      mColumnNamePosition = new HashMap<>();
  
      for (int i = 0; i < fieldNames.size(); i++) {
        final String fieldName = fieldNames.get(i);
  
        mColumnNamePosition.put(fieldName, i);
      }
    }
  
    @Override
    public ParquetRow toParquet() throws IOException {
      Schema writeSchema = mSchema.getWriteSchema();
      GenericRecordBuilder recordBuilder = new GenericRecordBuilder(writeSchema);
      for (FieldSchema field : mSchema.getAlluxioSchema()) {
        String name = field.getName();
        String type = field.getType();
        Object value = getColumn(name);
        recordBuilder.set(writeSchema.getField(name), convert(value, name, type));
      }
      return new ParquetRow(recordBuilder.build());
    }
  
    @Override
    public Object getColumn(String column) {
      final Integer columnPosition = mColumnNamePosition.get(column);
  
      if (columnPosition == null) {
        throw new IllegalArgumentException("Invalid column name: " + column);
      }
  
      final ColumnVector col = mBatch.cols[columnPosition];
  
      if (col.isNull[mPosition]) {
        return null;
      }
  
      if (col instanceof TimestampColumnVector) {
        return ((TimestampColumnVector) col).asScratchTimestamp(mPosition).getTime();
      } else if (col instanceof VoidColumnVector) {
        return null;
      } else if (col instanceof DecimalColumnVector) {
        return ((DecimalColumnVector) col).vector[mPosition]
            .getHiveDecimal();
      } else if (col instanceof LongColumnVector) {
        return ((LongColumnVector) col).vector[mPosition];
      } else if (col instanceof BytesColumnVector) {
        BytesColumnVector bcv = (BytesColumnVector) col;
        return Arrays.copyOfRange(bcv.vector[mPosition], bcv.start[mPosition],
            bcv.start[mPosition] + bcv.length[mPosition]);
      } else if (col instanceof DoubleColumnVector) {
        return ((DoubleColumnVector) col).vector[mPosition];
      }
  
      throw new UnsupportedOperationException("Unsupported column vector: "
          + col.getClass().getName());
    }
  
    private Object convert(Object value, String name, String type) {
      if (value == null) {
        return null;
      }
  
      switch (HiveConstants.Types.getHiveConstantType(type)) {
        case HiveConstants.Types.DECIMAL:
          final Decimal decimal = new Decimal(type);
          return ((HiveDecimal) value).bigIntegerBytesScaled(decimal.getScale());
        case HiveConstants.Types.VARCHAR:
        case HiveConstants.Types.CHAR:
        case HiveConstants.Types.STRING:
          return new String((byte[]) value);
        default:
          return value;
      }
    }
  }
  