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.calendar;
  
  import static org.apache.arrow.driver.jdbc.accessor.impl.calendar.ArrowFlightJdbcDateVectorGetter.Getter;
  import static org.apache.arrow.driver.jdbc.accessor.impl.calendar.ArrowFlightJdbcDateVectorGetter.Holder;
  import static org.apache.arrow.driver.jdbc.accessor.impl.calendar.ArrowFlightJdbcDateVectorGetter.createGetter;
  import static org.apache.arrow.driver.jdbc.utils.DateTimeUtils.getTimestampValue;
  import static org.apache.calcite.avatica.util.DateTimeUtils.MILLIS_PER_DAY;
  import static org.apache.calcite.avatica.util.DateTimeUtils.unixDateToString;
  
  import java.sql.Date;
  import java.sql.SQLException;
  import java.sql.Timestamp;
  import java.time.LocalDate;
  import java.util.Calendar;
  import java.util.concurrent.TimeUnit;
  import java.util.function.IntSupplier;
  import org.apache.arrow.driver.jdbc.accessor.ArrowFlightJdbcAccessor;
  import org.apache.arrow.driver.jdbc.accessor.ArrowFlightJdbcAccessorFactory;
  import org.apache.arrow.driver.jdbc.utils.DateTimeUtils;
  import org.apache.arrow.vector.DateDayVector;
  import org.apache.arrow.vector.DateMilliVector;
  import org.apache.arrow.vector.ValueVector;
  
  /** Accessor for the Arrow types: {@link DateDayVector} and {@link DateMilliVector}. */
  public class ArrowFlightJdbcDateVectorAccessor extends ArrowFlightJdbcAccessor {
  
    private final Getter getter;
    private final TimeUnit timeUnit;
    private final Holder holder;
  
    /**
     * Instantiate an accessor for a {@link DateDayVector}.
     *
     * @param vector an instance of a DateDayVector.
     * @param currentRowSupplier the supplier to track the lines.
     * @param setCursorWasNull the consumer to set if value was null.
     */
    public ArrowFlightJdbcDateVectorAccessor(
        DateDayVector vector,
        IntSupplier currentRowSupplier,
        ArrowFlightJdbcAccessorFactory.WasNullConsumer setCursorWasNull) {
      super(currentRowSupplier, setCursorWasNull);
      this.holder = new Holder();
      this.getter = createGetter(vector);
      this.timeUnit = getTimeUnitForVector(vector);
    }
  
    /**
     * Instantiate an accessor for a {@link DateMilliVector}.
     *
     * @param vector an instance of a DateMilliVector.
     * @param currentRowSupplier the supplier to track the lines.
     */
    public ArrowFlightJdbcDateVectorAccessor(
        DateMilliVector vector,
        IntSupplier currentRowSupplier,
        ArrowFlightJdbcAccessorFactory.WasNullConsumer setCursorWasNull) {
      super(currentRowSupplier, setCursorWasNull);
      this.holder = new Holder();
      this.getter = createGetter(vector);
      this.timeUnit = getTimeUnitForVector(vector);
    }
  
    @Override
    public Class<?> getObjectClass() {
      return Date.class;
    }
  
    @Override
    public Object getObject() {
      return this.getDate(null);
    }
  
    @Override
    public <T> T getObject(final Class<T> type) throws SQLException {
      final Object value;
      if (type == LocalDate.class) {
        value = getLocalDate();
      } else if (type == Date.class) {
        value = getObject();
      } else {
        throw new SQLException("Object type not supported for Date Vector");
      }
      return !type.isPrimitive() && wasNull ? null : type.cast(value);
    }
  
    @Override
    public Date getDate(Calendar calendar) {
      fillHolder();
      if (this.wasNull) {
        return null;
      }
  
      long value = holder.value;
      long milliseconds = this.timeUnit.toMillis(value);
  
      long millisWithCalendar = DateTimeUtils.applyCalendarOffset(milliseconds, calendar);
  
      return new Date(getTimestampValue(millisWithCalendar).getTime());
    }
  
    private void fillHolder() {
      getter.get(getCurrentRow(), holder);
      this.wasNull = holder.isSet == 0;
      this.wasNullConsumer.setWasNull(this.wasNull);
    }
  
    @Override
    public Timestamp getTimestamp(Calendar calendar) {
      Date date = getDate(calendar);
      if (date == null) {
        return null;
      }
      return new Timestamp(date.getTime());
    }
  
    @Override
    public String getString() {
      fillHolder();
      if (wasNull) {
        return null;
      }
      long milliseconds = timeUnit.toMillis(holder.value);
      return unixDateToString((int) (milliseconds / MILLIS_PER_DAY));
    }
  
    protected static TimeUnit getTimeUnitForVector(ValueVector vector) {
      if (vector instanceof DateDayVector) {
        return TimeUnit.DAYS;
      } else if (vector instanceof DateMilliVector) {
        return TimeUnit.MILLISECONDS;
      }
  
      throw new IllegalArgumentException("Invalid Arrow vector");
    }
  
    private LocalDate getLocalDate() {
      return getDate(null).toLocalDate();
    }
  }
  