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From "Gary Gregory (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CSV-68) Use Builder pattern for CSVFormat
Date Wed, 14 Nov 2012 16:02:13 GMT

    [ https://issues.apache.org/jira/browse/CSV-68?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497178#comment-13497178
] 

Gary Gregory commented on CSV-68:
---------------------------------

Hm... so why is this:

{code:java}
CSVFormat format = CSVFormat.defaults().withIgnoreSurroundingSpaces(false).build();
{code}

better than:

{code:java}
CSVFormat format = CSVFormat.DEFAULT.withIgnoreSurroundingSpaces(false);
{code}

?

>From a user's POV, I see defaults() vs DEFAULT, I'm indifferent, but now I have to call
an extra method, build(). So the patch makes configuration MORE verbose. That does not sound
right.

Does it to anyone else?

G
                
> Use Builder pattern for CSVFormat
> ---------------------------------
>
>                 Key: CSV-68
>                 URL: https://issues.apache.org/jira/browse/CSV-68
>             Project: Commons CSV
>          Issue Type: Improvement
>            Reporter: Sebb
>         Attachments: CSV-68_20121111.patch, CSV-68.patch, CSVFormat2.java, CVSFormat2Main.java
>
>
> Using a builder pattern to create CSVFormat instances would allow the settings to be
validated at creation time and would eliminate the need to keep creating new CSVFormat instances
whilst still allowing the class to be immutable.
> A possible API is as follows:
> {code}
> CSVFormat DEFAULT = CSVFormat.init(',') // delimiter is required
>         .withEncapsulator('"')
>         .withLeadingSpacesIgnored(true)
>         .withTrailingSpacesIgnored(true)
>         .withEmptyLinesIgnored(true)
>         .withLineSeparator("\r\n") // optional, as it would be the default
>         .build();
> CSVFormat format = CSVFormat.init(CSVFormat.DEFAULT) // alternatively start with pre-defined
format
>         .withSurroundingSpacesIgnored(false)
>         .build();
> {code}
> Compare this with the current syntax:
> {code}
> // internal syntax; not easy to determine what all the parameters do
> CSVFormat DEFAULT1 = new CSVFormat(',', '"', DISABLED, DISABLED, true, true, false, true,
CRLF);
> // external syntax
> CSVFormat format = CSVFormat.DEFAULT.withSurroundingSpacesIgnored(false);
> {code}
> As a proof of concept I've written skeleton code which compiles (but needs completing).

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