/*
    * 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
    *
   *   https://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.commons.csv.issues;
  
  import static org.apache.commons.csv.CsvAssertions.assertValuesEquals;
  
  import java.io.IOException;
  import java.io.StringReader;
  import java.util.Iterator;
  
  import org.apache.commons.csv.CSVFormat;
  import org.apache.commons.csv.CSVParser;
  import org.apache.commons.csv.CSVRecord;
  import org.apache.commons.csv.QuoteMode;
  import org.junit.jupiter.api.Test;
  
  /**
   * Setting QuoteMode:ALL_NON_NULL or NON_NUMERIC can distinguish between empty string columns and absent value columns.
   */
  class JiraCsv253Test {
  
      @Test
      void testHandleAbsentValues() throws IOException {
          // @formatter:off
          final String source =
                  "\"John\",,\"Doe\"\n" +
                  ",\"AA\",123\n" +
                  "\"John\",90,\n" +
                  "\"\",,90";
          // @formatter:on
          final CSVFormat csvFormat = CSVFormat.DEFAULT.builder().setQuoteMode(QuoteMode.NON_NUMERIC).get();
          try (CSVParser parser = csvFormat.parse(new StringReader(source))) {
              final Iterator<CSVRecord> csvRecords = parser.iterator();
              assertValuesEquals(new String[] {"John", null, "Doe"}, csvRecords.next());
              assertValuesEquals(new String[] {null, "AA", "123"}, csvRecords.next());
              assertValuesEquals(new String[] {"John", "90", null}, csvRecords.next());
              assertValuesEquals(new String[] {"", null, "90"}, csvRecords.next());
          }
      }
  }