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8283681: Improve ZonedDateTime offset handling

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Reviewed-by: scolebourne, naoto, rriggs
This commit is contained in:
Claes Redestad 2022-03-25 22:37:55 +00:00
parent 2600f99fec
commit 7bac0a878d
5 changed files with 156 additions and 4 deletions
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23
src/java.base/share/classes/java/time/ZoneOffset.java
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@ -86,6 +86,8 @@ import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import jdk.internal.vm.annotation.Stable;
/**
* A time-zone offset from Greenwich/UTC, such as {@code +02:00}.
* <p>
@ -168,6 +170,11 @@ public final class ZoneOffset
* The string form of the time-zone offset.
*/
private final transient String id;
/**
* The zone rules for an offset will always return this offset. Cache it for efficiency.
*/
@Stable
private transient ZoneRules rules;
//-----------------------------------------------------------------------
/**
@ -504,7 +511,21 @@ public final class ZoneOffset
*/
@Override
public ZoneRules getRules() {
return ZoneRules.of(this);
ZoneRules rules = this.rules;
if (rules == null) {
rules = this.rules = ZoneRules.of(this);
}
return rules;
}
@Override
public ZoneId normalized() {
return this;
}
@Override
/* package-private */ ZoneOffset getOffset(long epochSecond) {
return this;
}
//-----------------------------------------------------------------------