ceph/src/arrow/java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/consumer/DateConsumer.java

   1 /*
   2  * Licensed to the Apache Software Foundation (ASF) under one or more
   3  * contributor license agreements.  See the NOTICE file distributed with
   4  * this work for additional information regarding copyright ownership.
   5  * The ASF licenses this file to You under the Apache License, Version 2.0
   6  * (the "License"); you may not use this file except in compliance with
   7  * the License.  You may obtain a copy of the License at
   8  *
   9  *    http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 package org.apache.arrow.adapter.jdbc.consumer;
  19
  20 import java.sql.Date;
  21 import java.sql.ResultSet;
  22 import java.sql.SQLException;
  23 import java.util.Calendar;
  24 import java.util.concurrent.TimeUnit;
  25
  26 import org.apache.arrow.vector.DateDayVector;
  27 import org.apache.arrow.vector.DateMilliVector;
  28
  29 /**
  30  * Consumer which consume date type values from {@link ResultSet}.
  31  * Write the data to {@link org.apache.arrow.vector.DateDayVector}.
  32  */
  33 public class DateConsumer {
  34
  35   /**
  36    * Creates a consumer for {@link DateMilliVector}.
  37    */
  38   public static JdbcConsumer<DateDayVector> createConsumer(
  39       DateDayVector vector, int index, boolean nullable, Calendar calendar) {
  40     if (nullable) {
  41       return new NullableDateConsumer(vector, index, calendar);
  42     } else {
  43       return new NonNullableDateConsumer(vector, index, calendar);
  44     }
  45   }
  46
  47   /**
  48    * Nullable consumer for date.
  49    */
  50   static class NullableDateConsumer extends BaseConsumer<DateDayVector> {
  51
  52     protected final Calendar calendar;
  53
  54     /**
  55      * Instantiate a DateConsumer.
  56      */
  57     public NullableDateConsumer(DateDayVector vector, int index) {
  58       this(vector, index, /* calendar */null);
  59     }
  60
  61     /**
  62      * Instantiate a DateConsumer.
  63      */
  64     public NullableDateConsumer(DateDayVector vector, int index, Calendar calendar) {
  65       super(vector, index);
  66       this.calendar = calendar;
  67     }
  68
  69     @Override
  70     public void consume(ResultSet resultSet) throws SQLException {
  71       Date date = calendar == null ? resultSet.getDate(columnIndexInResultSet) :
  72           resultSet.getDate(columnIndexInResultSet, calendar);
  73       if (!resultSet.wasNull()) {
  74         // for fixed width vectors, we have allocated enough memory proactively,
  75         // so there is no need to call the setSafe method here.
  76         vector.set(currentIndex, Math.toIntExact(TimeUnit.MILLISECONDS.toDays(date.getTime())));
  77       }
  78       currentIndex++;
  79     }
  80   }
  81
  82   /**
  83    * Non-nullable consumer for date.
  84    */
  85   static class NonNullableDateConsumer extends BaseConsumer<DateDayVector> {
  86
  87     protected final Calendar calendar;
  88
  89     /**
  90      * Instantiate a DateConsumer.
  91      */
  92     public NonNullableDateConsumer(DateDayVector vector, int index) {
  93       this(vector, index, /* calendar */null);
  94     }
  95
  96     /**
  97      * Instantiate a DateConsumer.
  98      */
  99     public NonNullableDateConsumer(DateDayVector vector, int index, Calendar calendar) {
 100       super(vector, index);
 101       this.calendar = calendar;
 102     }
 103
 104     @Override
 105     public void consume(ResultSet resultSet) throws SQLException {
 106       Date date = calendar == null ? resultSet.getDate(columnIndexInResultSet) :
 107           resultSet.getDate(columnIndexInResultSet, calendar);
 108       // for fixed width vectors, we have allocated enough memory proactively,
 109       // so there is no need to call the setSafe method here.
 110       vector.set(currentIndex, Math.toIntExact(TimeUnit.MILLISECONDS.toDays(date.getTime())));
 111       currentIndex++;
 112     }
 113   }
 114 }
 115
 116