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* file:
*
* Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
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package java.time.temporal;
import static java.time.temporal.ChronoField.EPOCH_DAY;
import static java.time.temporal.ChronoField.NANO_OF_DAY;
import static java.time.temporal.ChronoField.OFFSET_SECONDS;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.chrono.Chronology;
/**
* Common implementations of {@code TemporalQuery}.
* <p>
* This class provides common implementations of {@link TemporalQuery}.
* These are defined here as they must be constants, and the definition
* of lambdas does not guarantee that. By assigning them once here,
* they become 'normal' Java constants.
*
* @since 1.8
*/
final class TemporalQueries {
// note that it is vital that each method supplies a constant, not a
// calculated value, as they will be checked for using ==
// it is also vital that each constant is different (due to the == checking)
// as such, alterations to this code must be done with care
/**
* Private constructor since this is a utility class.
*/
private TemporalQueries() {
}
//-----------------------------------------------------------------------
/**
* A strict query for the {@code ZoneId}.
*/
static final TemporalQuery<ZoneId> ZONE_ID = (temporal) -> {
return temporal.query(ZONE_ID);
};
/**
* A query for the {@code Chronology}.
*/
static final TemporalQuery<Chronology> CHRONO = (temporal) -> {
return temporal.query(CHRONO);
};
/**
* A query for the smallest supported unit.
*/
static final TemporalQuery<TemporalUnit> PRECISION = (temporal) -> {
return temporal.query(PRECISION);
};
//-----------------------------------------------------------------------
/**
* A lenient query for the {@code ZoneId}, falling back to the {@code ZoneOffset}.
*/
static final TemporalQuery<ZoneId> ZONE = (temporal) -> {
ZoneId zone = temporal.query(ZONE_ID);
return (zone != null ? zone : temporal.query(OFFSET));
};
/**
* A query for {@code ZoneOffset} returning null if not found.
*/
static final TemporalQuery<ZoneOffset> OFFSET = (temporal) -> {
if (temporal.isSupported(OFFSET_SECONDS)) {
return ZoneOffset.ofTotalSeconds(temporal.get(OFFSET_SECONDS));
}
return null;
};
/**
* A query for {@code LocalDate} returning null if not found.
*/
static final TemporalQuery<LocalDate> LOCAL_DATE = (temporal) -> {
if (temporal.isSupported(EPOCH_DAY)) {
return LocalDate.ofEpochDay(temporal.getLong(EPOCH_DAY));
}
return null;
};
/**
* A query for {@code LocalTime} returning null if not found.
*/
static final TemporalQuery<LocalTime> LOCAL_TIME = (temporal) -> {
if (temporal.isSupported(NANO_OF_DAY)) {
return LocalTime.ofNanoOfDay(temporal.getLong(NANO_OF_DAY));
}
return null;
};
}