[jira] [Commented] (CSV-82) CSVRecord inconsistent behaviour when header mapping is not found

["Benedikt Ritter (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CSV-82?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13608126#comment-13608126 ] 

Benedikt Ritter commented on CSV-82:
------------------------------------

Returning null is the same behavior as defined by {{java.util.Map.get(Object)}}. 
When a Map returns null on {{get(Object)}}, you don't know if this is, because null was associated with the key (given you are using a Map implementation that allows null values) or because no mapping for the given key is available.
Map provides {{contains(Object)}} to distinguish between the two cases.

{{CSVRecord}} OTOH provides {{isMapped(String)}} and {{isSet(String)}} for this.
                
> CSVRecord inconsistent behaviour when header mapping is not found
> -----------------------------------------------------------------
>
>                 Key: CSV-82
>                 URL: https://issues.apache.org/jira/browse/CSV-82
>             Project: Commons CSV
>          Issue Type: Bug
>            Reporter: Sebb
>
> The CSVRecord#get(String) method has inconsistent behaviour.
> If no header mapping was provided, then it throws IllegalStateException.
> If the header name is not found, null is returned.
> Apart from being inconsistent, it might be useful in the future to be able to return null as a column value (as distinct from the empty string).
> It should throw IllegalArgumentException for a missing header name, instead of returning null.

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