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.carbondata.presto.readers;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  import java.util.Optional;
  
  import io.prestosql.spi.block.ArrayBlock;
  import io.prestosql.spi.block.RowBlock;
  import io.prestosql.spi.type.*;
  
  import org.apache.carbondata.core.metadata.datatype.DataType;
  import org.apache.carbondata.core.metadata.datatype.DataTypes;
  import org.apache.carbondata.core.metadata.datatype.StructField;
  import org.apache.carbondata.core.scan.result.vector.CarbonColumnVector;
  import org.apache.carbondata.core.scan.result.vector.impl.CarbonColumnVectorImpl;
  
  import io.prestosql.spi.block.Block;
  import io.prestosql.spi.block.BlockBuilder;
  
  import org.apache.carbondata.presto.CarbonVectorBatch;
  import org.apache.carbondata.presto.ColumnarVectorWrapperDirect;
  
  /**
   * Class to read the complex type Stream [array/struct/map]
   */
  
  public class ComplexTypeStreamReader extends CarbonColumnVectorImpl
      implements PrestoVectorBlockBuilder {
  
    protected int batchSize;
  
    protected Type type;
    protected BlockBuilder builder;
  
    public ComplexTypeStreamReader(int batchSize, StructField field) {
      super(batchSize, field.getDataType());
      this.batchSize = batchSize;
      this.type = getType(field);
      List<CarbonColumnVector> childrenList = new ArrayList<>();
      for (StructField child : field.getChildren()) {
        childrenList.add(new ColumnarVectorWrapperDirect(Objects.requireNonNull(
            CarbonVectorBatch.createDirectStreamReader(this.batchSize, child.getDataType(), child))));
      }
      setChildrenVector(childrenList);
      this.builder = type.createBlockBuilder(null, batchSize);
    }
  
    Type getType(StructField field) {
      DataType dataType = field.getDataType();
      if (dataType == DataTypes.STRING || dataType == DataTypes.VARCHAR) {
        return VarcharType.VARCHAR;
      } else if (dataType == DataTypes.SHORT) {
        return SmallintType.SMALLINT;
      } else if (dataType == DataTypes.INT) {
        return IntegerType.INTEGER;
      } else if (dataType == DataTypes.LONG) {
        return BigintType.BIGINT;
      } else if (dataType == DataTypes.DOUBLE) {
        return DoubleType.DOUBLE;
      } else if (dataType == DataTypes.FLOAT) {
        return RealType.REAL;
      } else if (dataType == DataTypes.BOOLEAN) {
        return BooleanType.BOOLEAN;
      } else if (dataType == DataTypes.BINARY) {
        return VarbinaryType.VARBINARY;
      } else if (dataType == DataTypes.DATE) {
        return DateType.DATE;
      } else if (dataType == DataTypes.TIMESTAMP) {
        return TimestampType.TIMESTAMP;
      } else if (dataType == DataTypes.BYTE) {
        return TinyintType.TINYINT;
      } else if (DataTypes.isDecimal(dataType)) {
        org.apache.carbondata.core.metadata.datatype.DecimalType decimal =
            (org.apache.carbondata.core.metadata.datatype.DecimalType) dataType;
        return DecimalType.createDecimalType(decimal.getPrecision(), decimal.getScale());
      } else if (DataTypes.isArrayType(dataType)) {
        return new ArrayType(getType(field.getChildren().get(0)));
      } else if (DataTypes.isStructType(dataType)) {
        List<RowType.Field> children = new ArrayList<>();
        for (StructField child : field.getChildren()) {
          children.add(new RowType.Field(Optional.of(child.getFieldName()), getType(child)));
        }
        return RowType.from(children);
      } else {
        throw new UnsupportedOperationException("Unsupported type: " + dataType);
      }
    }
  
    @Override public Block buildBlock() {
      return builder.build();
    }
  
    @Override public void setBatchSize(int batchSize) {
      this.batchSize = batchSize;
    }
  
    @Override
    public void putComplexObject(List<Integer> offsetVector) {
      if (type instanceof ArrayType) {
        // build child block
        Block childBlock = buildChildBlock(getChildrenVector().get(0));
        // prepare an offset vector with 0 as initial offset
        int[] offsetVectorArray = new int[offsetVector.size() + 1];
        for (int i = 1; i <= offsetVector.size(); i++) {
          offsetVectorArray[i] = offsetVectorArray[i - 1] + offsetVector.get(i - 1);
        }
        // prepare Array block
        Block arrayBlock = ArrayBlock
            .fromElementBlock(offsetVector.size(), Optional.empty(), offsetVectorArray,
                childBlock);
        for (int position = 0; position < offsetVector.size(); position++) {
          type.writeObject(builder, arrayBlock.getObject(position, Block.class));
        }
        getChildrenVector().get(0).getColumnVector().reset();
      } else {
        // build child blocks
        List<Block> childBlocks = new ArrayList<>(getChildrenVector().size());
        for (CarbonColumnVector child : getChildrenVector()) {
          childBlocks.add(buildChildBlock(child));
        }
        // prepare ROW block
        Block rowBlock = RowBlock
            .fromFieldBlocks(offsetVector.size(), Optional.empty(),
                childBlocks.toArray(new Block[0]));
        for (int position = 0; position < offsetVector.size(); position++) {
          type.writeObject(builder, rowBlock.getObject(position, Block.class));
        }
        for (CarbonColumnVector child : getChildrenVector()) {
          child.getColumnVector().reset();
        }
      }
    }
  
    private Block buildChildBlock(CarbonColumnVector carbonColumnVector) {
      DataType dataType = carbonColumnVector.getType();
      carbonColumnVector = carbonColumnVector.getColumnVector();
      if (dataType == DataTypes.STRING || dataType == DataTypes.BINARY
          || dataType == DataTypes.VARCHAR) {
        return ((SliceStreamReader) carbonColumnVector).buildBlock();
      } else if (dataType == DataTypes.SHORT) {
        return ((ShortStreamReader) carbonColumnVector).buildBlock();
      } else if (dataType == DataTypes.INT || dataType == DataTypes.DATE) {
        return ((IntegerStreamReader) carbonColumnVector).buildBlock();
      } else if (dataType == DataTypes.LONG) {
        return ((LongStreamReader) carbonColumnVector).buildBlock();
      } else if (dataType == DataTypes.DOUBLE) {
        return ((DoubleStreamReader) carbonColumnVector).buildBlock();
      } else if (dataType == DataTypes.FLOAT) {
        return ((FloatStreamReader) carbonColumnVector).buildBlock();
      } else if (dataType == DataTypes.TIMESTAMP) {
        return ((TimestampStreamReader) carbonColumnVector).buildBlock();
      } else if (dataType == DataTypes.BOOLEAN) {
        return ((BooleanStreamReader) carbonColumnVector).buildBlock();
      } else if (DataTypes.isDecimal(dataType)) {
        return ((DecimalSliceStreamReader) carbonColumnVector).buildBlock();
      } else if (dataType == DataTypes.BYTE) {
        return ((ByteStreamReader) carbonColumnVector).buildBlock();
      } else if (DataTypes.isArrayType(dataType) || (DataTypes.isStructType(dataType))) {
        return ((ComplexTypeStreamReader) carbonColumnVector).buildBlock();
      } else {
        throw new UnsupportedOperationException("unsupported for type :" + dataType);
      }
    }
  
    @Override public void putNull(int rowId) {
      builder.appendNull();
    }
  
    @Override public void reset() {
      builder = type.createBlockBuilder(null, batchSize);
    }
  
    @Override public void putNulls(int rowId, int count) {
      for (int i = 0; i < count; i++) {
        builder.appendNull();
      }
    }
  }
  
  