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From "Benedikt Ritter (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CSV-68) Use Builder pattern for CSVFormat
Date Sun, 11 Nov 2012 18:37:12 GMT

     [ https://issues.apache.org/jira/browse/CSV-68?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benedikt Ritter updated CSV-68:
-------------------------------

    Attachment: CSV-68_20121111.patch

It has been a while since this has been discussed and the API has changed a bit since then.
I implement the builder not knowing, that sebb already created a patch for this (better browse
JIRA before coding next time). Since my patch is more up to date, I'm uploading it anyway
to get the discussion started again.

Regards,
Benedikt
                
> 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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