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https://issues.apache.org/jira/browse/CSV-247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16945858#comment-16945858
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Alex Herbert commented on CSV-247:
----------------------------------
I still think there is an inconsistency.
My original test case in the ticket header expects an exception when there is a
single missing header and the parser is configured to not allow missing column
names.
This is how the code works. This runs fine against current master:
{code:java}
@Test
public void testHeadersMissing() throws Exception {
// The default does not allow missing column names but allows duplicate
headers
Assertions.assertFalse(CSVFormat.DEFAULT.getAllowMissingColumnNames(),
"By default we should not allow missing column names");
Assertions.assertTrue(CSVFormat.DEFAULT.getAllowDuplicateHeaderNames(),
"By default we should allow duplicate column names");
// 1 missing column header is OK
Assertions.assertDoesNotThrow(() -> {
final Reader in = new StringReader("a,,c,d,e\n1,2,3,4,5\nv,w,x,y,z");
CSVFormat.DEFAULT.withHeader().parse(in).iterator();
}, "1 missing column header is OK");
// 2 missing column headers is not OK
Assertions.assertThrows(IllegalArgumentException.class, () -> {
final Reader in = new StringReader("a,,c,d,\n1,2,3,4,5\nv,w,x,y,z");
CSVFormat.DEFAULT.withHeader().parse(in).iterator();
}, "2+ missing column headers is not allowed!");
}
{code}
So 1 missing header is fine but not 2 or more. This is the bug.
My PR to fix this is old. Do you want a rebased version with tests showing what
I expect?
> A single empty header is allowed when not allowing empty column headers.
> ------------------------------------------------------------------------
>
> Key: CSV-247
> URL: https://issues.apache.org/jira/browse/CSV-247
> Project: Commons CSV
> Issue Type: Bug
> Affects Versions: 1.7
> Reporter: Alex Herbert
> Priority: Minor
> Time Spent: 40m
> Remaining Estimate: 0h
>
> If the settings are not allowing empty columns headers you can currently use
> a single empty header. This is because column headers are only checked for
> empty when they are duplicates. So it is the second empty header (the first
> duplicate) that raises an error. This test should pass but does not:
> {code:java}
> @Test(expected = IllegalArgumentException.class)
> public void testHeadersMissingOneColumnException() throws Exception {
> final Reader in = new StringReader("a,,c,d\n1,2,3,4\nx,y,z,zz");
> CSVFormat.DEFAULT.withHeader().parse(in).iterator();
> }
> {code}
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