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.Optional;
  
  import org.apache.carbondata.core.metadata.datatype.DataType;
  import org.apache.carbondata.core.scan.result.vector.CarbonDictionary;
  import org.apache.carbondata.core.scan.result.vector.impl.CarbonColumnVectorImpl;
  
  import com.facebook.presto.spi.block.Block;
  import com.facebook.presto.spi.block.BlockBuilder;
  import com.facebook.presto.spi.block.DictionaryBlock;
  import com.facebook.presto.spi.block.VariableWidthBlock;
  import com.facebook.presto.spi.type.Type;
  import com.facebook.presto.spi.type.VarcharType;
  import io.airlift.slice.Slices;
  
  import static io.airlift.slice.Slices.wrappedBuffer;
  
  /**
   * This class reads the String data and convert it into Slice Block
   */
  public class SliceStreamReader extends CarbonColumnVectorImpl implements PrestoVectorBlockBuilder {
  
    protected int batchSize;
  
    protected Type type = VarcharType.VARCHAR;
  
    protected BlockBuilder builder;
  
    private Block dictionaryBlock;
  
    private boolean isLocalDict;
  
    private int positionCount;
  
    private boolean isLocalDictEnabledForComplextype;
  
    public SliceStreamReader(int batchSize, DataType dataType) {
      super(batchSize, dataType);
      this.batchSize = batchSize;
      this.builder = type.createBlockBuilder(null, batchSize);
    }
  
    @Override
    public Block buildBlock() {
      if (dictionaryBlock == null) {
        return builder.build();
      } else {
        int[] dataArray;
        if (isLocalDict) {
          dataArray = (int[]) ((CarbonColumnVectorImpl) getDictionaryVector()).getDataArray();
        } else {
          dataArray = (int[]) getDataArray();
        }
        positionCount = isLocalDictEnabledForComplextype ? positionCount : batchSize;
        return new DictionaryBlock(positionCount, dictionaryBlock, dataArray);
      }
    }
  
    @Override
    public void setDictionary(CarbonDictionary dictionary) {
      super.setDictionary(dictionary);
      if (dictionary == null) {
        dictionaryBlock = null;
        this.isLocalDict = false;
        return;
      }
      boolean[] nulls = new boolean[dictionary.getDictionarySize()];
      nulls[0] = true;
      nulls[1] = true;
      int[] dictOffsets = new int[dictionary.getDictionarySize() + 1];
      int size = 0;
      for (int i = 0; i < dictionary.getDictionarySize(); i++) {
        dictOffsets[i] = size;
        if (dictionary.getDictionaryValue(i) != null) {
          size += dictionary.getDictionaryValue(i).length;
        }
      }
      byte[] singleArrayDictValues = new byte[size];
      for (int i = 0; i < dictionary.getDictionarySize(); i++) {
        if (dictionary.getDictionaryValue(i) != null) {
          System.arraycopy(dictionary.getDictionaryValue(i), 0, singleArrayDictValues, dictOffsets[i],
              dictionary.getDictionaryValue(i).length);
        }
      }
      dictOffsets[dictOffsets.length - 1] = size;
      dictionaryBlock = new VariableWidthBlock(dictionary.getDictionarySize(),
          Slices.wrappedBuffer(singleArrayDictValues), dictOffsets, Optional.of(nulls));
      this.isLocalDict = true;
    }
  
    @Override
    public void setPositionCount(int positionCount) {
      this.positionCount = positionCount;
    }
  
    @Override
    public void setIsLocalDictEnabledForComplextype(boolean value) {
      this.isLocalDictEnabledForComplextype = value;
    }
  
    @Override
    public void setBatchSize(int batchSize) {
      this.batchSize = batchSize;
    }
  
    @Override
    public void putByteArray(int rowId, byte[] value) {
      type.writeSlice(builder, wrappedBuffer(value));
    }
  
    @Override
    public void putByteArray(int rowId, int offset, int length, byte[] value) {
      type.writeSlice(builder, wrappedBuffer(value), offset, length);
    }
  
    @Override
    public void putByteArray(int rowId, int count, byte[] value) {
      for (int i = 0; i < count; i++) {
        type.writeSlice(builder, wrappedBuffer(value));
      }
    }
  
    @Override
    public void putAllByteArray(byte[] data, int offset, int length) {
      super.putAllByteArray(data, offset, length);
      int[] lengths = getLengths();
      int[] offsets = getOffsets();
      if (lengths == null) {
        return;
      }
      for (int i = 0; i < lengths.length; i++) {
        if (offsets[i] != 0) {
          putByteArray(i, offsets[i], lengths[i], data);
        }
      }
    }
  
    @Override
    public void putNull(int rowId) {
      if (dictionaryBlock == null) {
        builder.appendNull();
      }
    }
  
    @Override
    public void putNulls(int rowId, int count) {
      if (dictionaryBlock == null) {
        for (int i = 0; i < count; ++i) {
          builder.appendNull();
        }
      }
    }
  
    @Override
    public void reset() {
      builder = type.createBlockBuilder(null, batchSize);
    }
  
    @Override
    public void putObject(int rowId, Object value) {
      if (value == null) {
        putNull(rowId);
      } else {
        if (dictionaryBlock == null) {
          putByteArray(rowId, (byte []) value);
        } else {
          putInt(rowId, (int) value);
        }
      }
    }
  }
  