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.driver.jdbc.accessor.impl.complex;
  
  import java.sql.Array;
  import java.util.List;
  import java.util.function.IntSupplier;
  import org.apache.arrow.driver.jdbc.ArrowFlightJdbcArray;
  import org.apache.arrow.driver.jdbc.accessor.ArrowFlightJdbcAccessor;
  import org.apache.arrow.driver.jdbc.accessor.ArrowFlightJdbcAccessorFactory;
  import org.apache.arrow.vector.FieldVector;
  import org.apache.arrow.vector.complex.FixedSizeListVector;
  import org.apache.arrow.vector.complex.LargeListVector;
  import org.apache.arrow.vector.complex.ListVector;
  
  /**
   * Base Accessor for the Arrow types {@link ListVector}, {@link LargeListVector} and {@link
   * FixedSizeListVector}.
   */
  public abstract class AbstractArrowFlightJdbcListVectorAccessor extends ArrowFlightJdbcAccessor {
  
    protected AbstractArrowFlightJdbcListVectorAccessor(
        IntSupplier currentRowSupplier,
        ArrowFlightJdbcAccessorFactory.WasNullConsumer setCursorWasNull) {
      super(currentRowSupplier, setCursorWasNull);
    }
  
    @Override
    public Class<?> getObjectClass() {
      return List.class;
    }
  
    protected abstract long getStartOffset(int index);
  
    protected abstract long getEndOffset(int index);
  
    protected abstract FieldVector getDataVector();
  
    protected abstract boolean isNull(int index);
  
    @Override
    public final Array getArray() {
      int index = getCurrentRow();
      FieldVector dataVector = getDataVector();
  
      this.wasNull = isNull(index);
      this.wasNullConsumer.setWasNull(this.wasNull);
      if (this.wasNull) {
        return null;
      }
  
      long startOffset = getStartOffset(index);
      long endOffset = getEndOffset(index);
  
      long valuesCount = endOffset - startOffset;
      return new ArrowFlightJdbcArray(dataVector, startOffset, valuesCount);
    }
  }
  