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.arrow.adapter.jdbc.consumer;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import org.apache.arrow.memory.ArrowBuf;
  import org.apache.arrow.vector.BitVectorHelper;
  import org.apache.arrow.vector.VarBinaryVector;
  
  /**
   * Consumer which consume binary type values from {@link ResultSet}. Write the data to {@link
   * org.apache.arrow.vector.VarBinaryVector}.
   */
  public abstract class BinaryConsumer extends BaseConsumer<VarBinaryVector> {
  
    /** Creates a consumer for {@link VarBinaryVector}. */
    public static BinaryConsumer createConsumer(VarBinaryVector vector, int index, boolean nullable) {
      if (nullable) {
        return new NullableBinaryConsumer(vector, index);
      } else {
        return new NonNullableBinaryConsumer(vector, index);
      }
    }
  
    private final byte[] reuseBytes = new byte[1024];
  
    /** Instantiate a BinaryConsumer. */
    public BinaryConsumer(VarBinaryVector vector, int index) {
      super(vector, index);
      if (vector != null) {
        vector.allocateNewSafe();
      }
    }
  
    /** consume a InputStream. */
    public void consume(InputStream is) throws IOException {
      while (currentIndex >= vector.getValueCapacity()) {
        vector.reallocValidityAndOffsetBuffers();
      }
  
      final int startOffset = vector.getStartOffset(currentIndex);
      final ArrowBuf offsetBuffer = vector.getOffsetBuffer();
      int dataLength = 0;
  
      if (is != null) {
        int read;
        while ((read = is.read(reuseBytes)) != -1) {
          while (vector.getDataBuffer().capacity() < (startOffset + dataLength + read)) {
            vector.reallocDataBuffer();
          }
          vector.getDataBuffer().setBytes(startOffset + dataLength, reuseBytes, 0, read);
          dataLength += read;
        }
  
        BitVectorHelper.setBit(vector.getValidityBuffer(), currentIndex);
      }
      offsetBuffer.setInt(
          (currentIndex + 1) * ((long) VarBinaryVector.OFFSET_WIDTH), startOffset + dataLength);
      vector.setLastSet(currentIndex);
    }
  
    public void moveWriterPosition() {
      currentIndex++;
    }
  
    @Override
    public void resetValueVector(VarBinaryVector vector) {
      this.vector = vector;
      this.vector.allocateNewSafe();
      this.currentIndex = 0;
    }
  
    /** Consumer for nullable binary data. */
    static class NullableBinaryConsumer extends BinaryConsumer {
  
      /** Instantiate a BinaryConsumer. */
      public NullableBinaryConsumer(VarBinaryVector vector, int index) {
        super(vector, index);
      }
  
      @Override
      public void consume(ResultSet resultSet) throws SQLException, IOException {
        InputStream is = resultSet.getBinaryStream(columnIndexInResultSet);
        consume(is);
        moveWriterPosition();
      }
    }
  
    /** Consumer for non-nullable binary data. */
    static class NonNullableBinaryConsumer extends BinaryConsumer {
  
      /** Instantiate a BinaryConsumer. */
      public NonNullableBinaryConsumer(VarBinaryVector vector, int index) {
        super(vector, index);
      }
  
      @Override
      public void consume(ResultSet resultSet) throws SQLException, IOException {
        InputStream is = resultSet.getBinaryStream(columnIndexInResultSet);
        consume(is);
        moveWriterPosition();
      }
    }
  }
  