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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  package org.apache.commons.csv.issues;
18  
19  import static org.junit.jupiter.api.Assertions.assertEquals;
20  
21  import java.io.IOException;
22  import java.io.StringReader;
23  import java.util.Iterator;
24  
25  import org.apache.commons.csv.CSVFormat;
26  import org.apache.commons.csv.CSVParser;
27  import org.apache.commons.csv.CSVRecord;
28  import org.apache.commons.csv.QuoteMode;
29  import org.junit.jupiter.api.Test;
30  
31  /**
32   * Setting QuoteMode:ALL_NON_NULL or NON_NUMERIC can distinguish between empty string columns and absent value columns.
33   */
34  public class JiraCsv253Test {
35  
36      private void assertArrayEqual(final String[] expected, final CSVRecord actual) {
37          for (int i = 0; i < expected.length; i++) {
38              assertEquals(expected[i], actual.get(i));
39          }
40      }
41  
42      @Test
43      public void testHandleAbsentValues() throws IOException {
44          final String source = "\"John\",,\"Doe\"\n" + ",\"AA\",123\n" + "\"John\",90,\n" + "\"\",,90";
45          final CSVFormat csvFormat = CSVFormat.DEFAULT.builder().setQuoteMode(QuoteMode.NON_NUMERIC).build();
46          try (final CSVParser parser = csvFormat.parse(new StringReader(source))) {
47              final Iterator<CSVRecord> csvRecords = parser.iterator();
48              assertArrayEqual(new String[] {"John", null, "Doe"}, csvRecords.next());
49              assertArrayEqual(new String[] {null, "AA", "123"}, csvRecords.next());
50              assertArrayEqual(new String[] {"John", "90", null}, csvRecords.next());
51              assertArrayEqual(new String[] {"", null, "90"}, csvRecords.next());
52          }
53      }
54  }