RFR: 8267587: Update java.util to use enhanced switch [v5]
Chris Hegarty
chegar at openjdk.java.net
Tue May 25 15:54:57 UTC 2021
On Tue, 25 May 2021 11:49:18 GMT, Tagir F. Valeev <tvaleev at openjdk.org> wrote:
>> Inspired by PR#4088. Most of the changes are done automatically using IntelliJ IDEA refactoring. Some manual adjustments are also performed, including indentations, moving comments, extracting common cast out of switch expression branches, etc.
>>
>> I also noticed that there are some switches having one branch only in JapaneseImperialCalendar.java. Probably it would be better to replace them with `if` statement?
>
> Tagir F. Valeev has updated the pull request incrementally with one additional commit since the last revision:
>
> More vertical alignment
src/java.base/share/classes/java/util/Calendar.java line 1507:
> 1505: }
> 1506: case "japanese" -> cal = new JapaneseImperialCalendar(zone, locale, true);
> 1507: default -> throw new IllegalArgumentException("unknown calendar type: " + type);
In this case, it would be good to yield the result of the switch expression and assign that to a local, rather than assigning in each of the case arms, e.g:
final Calendar cal = switch (type) {
case "gregory" -> new GregorianCalendar(zone, locale, true);
case "iso8601" -> {
GregorianCalendar gcal = new GregorianCalendar(zone, locale, true);
// make gcal a proleptic Gregorian
gcal.setGregorianChange(new Date(Long.MIN_VALUE));
// and week definition to be compatible with ISO 8601
setWeekDefinition(MONDAY, 4);
yield gcal;
}
case "buddhist" -> {
var buddhistCalendar = new BuddhistCalendar(zone, locale);
buddhistCalendar.clear();
yield buddhistCalendar;
}
case "japanese" -> new JapaneseImperialCalendar(zone, locale, true);
default -> throw new IllegalArgumentException("unknown calendar type: " + type);
};
-------------
PR: https://git.openjdk.java.net/jdk/pull/4161
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