<i18n dev> RFR: 8368172: Make java.time.format.DateTimePrintContext immutable [v6]

[Shaojin Wen]

On Thu, 2 Oct 2025 13:24:25 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> And one more thought/question: The optionality of formatting is a parameter used in the traversal of the formatting and parsing and affect nested formatting calls. The DateTimePrintContext previously counts the depth of the nesting with >0 indicating optional. It is the component that determines (based on optional:true) whether an absent value throws. Was it considered to change DateTimePrinterContext.optional to `final boolean optional` and create a second instance with optional=true.
> 
> Only the CompositePrinterParser changes the state to indicate that nested PrinterParsers are optional. CompositePrinterParser could substitute the optional DateTimePrintContext. That would be closer to the current design and if allow it to be immutable.

It seems strange that the formatting process creates a new DateTimePrintContext object.

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PR Comment: https://git.openjdk.org/jdk/pull/26913#issuecomment-3361262924