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 org.apache.arrow.vector.DateDayVector;
  import org.apache.arrow.vector.DateMilliVector;
  import org.apache.arrow.vector.holders.NullableDateDayHolder;
  import org.apache.arrow.vector.holders.NullableDateMilliHolder;
  
  /** Auxiliary class used to unify data access on TimeStampVectors. */
  final class ArrowFlightJdbcDateVectorGetter {
  
    private ArrowFlightJdbcDateVectorGetter() {
      // Prevent instantiation.
    }
  
    /**
     * Auxiliary class meant to unify Date*Vector#get implementations with different classes of
     * ValueHolders.
     */
    static class Holder {
      int isSet; // Tells if value is set; 0 = not set, 1 = set
      long value; // Holds actual value in its respective timeunit
    }
  
    /** Functional interface used to unify Date*Vector#get implementations. */
    @FunctionalInterface
    interface Getter {
      void get(int index, Holder holder);
    }
  
    static Getter createGetter(DateDayVector vector) {
      NullableDateDayHolder auxHolder = new NullableDateDayHolder();
      return (index, holder) -> {
        vector.get(index, auxHolder);
        holder.isSet = auxHolder.isSet;
        holder.value = auxHolder.value;
      };
    }
  
    static Getter createGetter(DateMilliVector vector) {
      NullableDateMilliHolder auxHolder = new NullableDateMilliHolder();
      return (index, holder) -> {
        vector.get(index, auxHolder);
        holder.isSet = auxHolder.isSet;
        holder.value = auxHolder.value;
      };
    }
  }
  