src/share/classes/java/time/temporal/JulianFields.java
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@@ -63,22 +63,24 @@
import static java.time.temporal.ChronoField.EPOCH_DAY;
import static java.time.temporal.ChronoUnit.DAYS;
import static java.time.temporal.ChronoUnit.FOREVER;
-import java.io.InvalidObjectException;
-import java.io.Serializable;
import java.time.DateTimeException;
-import java.time.LocalDate;
-import java.time.format.DateTimeBuilder;
+import java.util.Collections;
+import java.util.Map;
/**
* A set of date fields that provide access to Julian Days.
* <p>
* The Julian Day is a standard way of expressing date and time commonly used in the scientific community.
* It is expressed as a decimal number of whole days where days start at midday.
* This class represents variations on Julian Days that count whole days from midnight.
+ * <p>
+ * The fields are implemented relative to {@link ChronoField#EPOCH_DAY EPOCH_DAY}.
+ * The fields are supported, and can be queried and set if {@code EPOCH_DAY} is available.
+ * The fields work with all chronologies.
*
* <h3>Specification for implementors</h3>
* This is an immutable and thread-safe class.
*
* @since 1.8
@@ -97,14 +99,14 @@
* Julian Day is a well-known system that represents the count of whole days since day 0,
* which is defined to be January 1, 4713 BCE in the Julian calendar, and -4713-11-24 Gregorian.
* The field has "JulianDay" as 'name', and 'DAYS' as 'baseUnit'.
* The field always refers to the local date-time, ignoring the offset or zone.
* <p>
- * For date-times, 'JULIAN_DAY.doGet()' assumes the same value from
+ * For date-times, 'JULIAN_DAY.getFrom()' assumes the same value from
* midnight until just before the next midnight.
- * When 'JULIAN_DAY.doWith()' is applied to a date-time, the time of day portion remains unaltered.
- * 'JULIAN_DAY.doWith()' and 'JULIAN_DAY.doGet()' only apply to {@code Temporal} objects that
+ * When 'JULIAN_DAY.adjustInto()' is applied to a date-time, the time of day portion remains unaltered.
+ * 'JULIAN_DAY.adjustInto()' and 'JULIAN_DAY.getFrom()' only apply to {@code Temporal} objects that
* can be converted into {@link ChronoField#EPOCH_DAY}.
* A {@link DateTimeException} is thrown for any other type of object.
* <p>
* <h3>Astronomical and Scientific Notes</h3>
* The standard astronomical definition uses a fraction to indicate the time-of-day,
@@ -127,25 +129,25 @@
* <p>
* Julian Days are sometimes taken to imply Universal Time or UTC, but this
* implementation always uses the Julian Day number for the local date,
* regardless of the offset or time-zone.
*/
- public static final TemporalField JULIAN_DAY = new Field("JulianDay", DAYS, FOREVER, JULIAN_DAY_OFFSET);
+ public static final TemporalField JULIAN_DAY = Field.JULIAN_DAY;
/**
* Modified Julian Day field.
* <p>
* This is an integer-based version of the Modified Julian Day Number.
* Modified Julian Day (MJD) is a well-known system that counts days continuously.
* It is defined relative to astronomical Julian Day as {@code MJD = JD - 2400000.5}.
* Each Modified Julian Day runs from midnight to midnight.
* The field always refers to the local date-time, ignoring the offset or zone.
* <p>
- * For date-times, 'MODIFIED_JULIAN_DAY.doGet()' assumes the same value from
+ * For date-times, 'MODIFIED_JULIAN_DAY.getFrom()' assumes the same value from
* midnight until just before the next midnight.
- * When 'MODIFIED_JULIAN_DAY.doWith()' is applied to a date-time, the time of day portion remains unaltered.
- * 'MODIFIED_JULIAN_DAY.doWith()' and 'MODIFIED_JULIAN_DAY.doGet()' only apply to {@code Temporal} objects
+ * When 'MODIFIED_JULIAN_DAY.adjustInto()' is applied to a date-time, the time of day portion remains unaltered.
+ * 'MODIFIED_JULIAN_DAY.adjustInto()' and 'MODIFIED_JULIAN_DAY.getFrom()' only apply to {@code Temporal} objects
* that can be converted into {@link ChronoField#EPOCH_DAY}.
* A {@link DateTimeException} is thrown for any other type of object.
* <p>
* This implementation is an integer version of MJD with the decimal part rounded to floor.
* <p>
@@ -163,42 +165,45 @@
* <p>
* Modified Julian Days are sometimes taken to imply Universal Time or UTC, but this
* implementation always uses the Modified Julian Day for the local date,
* regardless of the offset or time-zone.
*/
- public static final TemporalField MODIFIED_JULIAN_DAY = new Field("ModifiedJulianDay", DAYS, FOREVER, 40587L);
+ public static final TemporalField MODIFIED_JULIAN_DAY = Field.MODIFIED_JULIAN_DAY;
/**
* Rata Die field.
* <p>
* Rata Die counts whole days continuously starting day 1 at midnight at the beginning of 0001-01-01 (ISO).
* The field always refers to the local date-time, ignoring the offset or zone.
* <p>
- * For date-times, 'RATA_DIE.doGet()' assumes the same value from
+ * For date-times, 'RATA_DIE.getFrom()' assumes the same value from
* midnight until just before the next midnight.
- * When 'RATA_DIE.doWith()' is applied to a date-time, the time of day portion remains unaltered.
- * 'MODIFIED_JULIAN_DAY.doWith()' and 'RATA_DIE.doGet()' only apply to {@code Temporal} objects
+ * When 'RATA_DIE.adjustInto()' is applied to a date-time, the time of day portion remains unaltered.
+ * 'RATA_DIE.adjustInto()' and 'RATA_DIE.getFrom()' only apply to {@code Temporal} objects
* that can be converted into {@link ChronoField#EPOCH_DAY}.
* A {@link DateTimeException} is thrown for any other type of object.
*/
- public static final TemporalField RATA_DIE = new Field("RataDie", DAYS, FOREVER, 719163L);
+ public static final TemporalField RATA_DIE = Field.RATA_DIE;
/**
* Restricted constructor.
*/
private JulianFields() {
throw new AssertionError("Not instantiable");
}
/**
- * implementation of JulianFields. Each instance is a singleton.
+ * Implementation of JulianFields. Each instance is a singleton.
*/
- private static class Field implements TemporalField, Serializable {
+ private static enum Field implements TemporalField {
+ JULIAN_DAY("JulianDay", DAYS, FOREVER, JULIAN_DAY_OFFSET),
+ MODIFIED_JULIAN_DAY("ModifiedJulianDay", DAYS, FOREVER, 40587L),
+ RATA_DIE("RataDie", DAYS, FOREVER, 719163L);
private static final long serialVersionUID = -7501623920830201812L;
- private final String name;
+ private final transient String name;
private final transient TemporalUnit baseUnit;
private final transient TemporalUnit rangeUnit;
private final transient ValueRange range;
private final transient long offset;
@@ -208,29 +213,10 @@
this.rangeUnit = rangeUnit;
this.range = ValueRange.of(-365243219162L + offset, 365241780471L + offset);
this.offset = offset;
}
-
- /**
- * Resolve the object from the stream to the appropriate singleton.
- * @return one of the singleton objects {@link #JULIAN_DAY},
- * {@link #MODIFIED_JULIAN_DAY}, or {@link #RATA_DIE}.
- * @throws InvalidObjectException if the object in the stream is not one of the singletons.
- */
- private Object readResolve() throws InvalidObjectException {
- if (JULIAN_DAY.getName().equals(name)) {
- return JULIAN_DAY;
- } else if (MODIFIED_JULIAN_DAY.getName().equals(name)) {
- return MODIFIED_JULIAN_DAY;
- } else if (RATA_DIE.getName().equals(name)) {
- return RATA_DIE;
- } else {
- throw new InvalidObjectException("Not one of the singletons");
- }
- }
-
//-----------------------------------------------------------------------
@Override
public String getName() {
return name;
}
@@ -250,56 +236,44 @@
return range;
}
//-----------------------------------------------------------------------
@Override
- public boolean doIsSupported(TemporalAccessor temporal) {
+ public boolean isSupportedBy(TemporalAccessor temporal) {
return temporal.isSupported(EPOCH_DAY);
}
@Override
- public ValueRange doRange(TemporalAccessor temporal) {
- if (doIsSupported(temporal) == false) {
+ public ValueRange rangeRefinedBy(TemporalAccessor temporal) {
+ if (isSupportedBy(temporal) == false) {
throw new DateTimeException("Unsupported field: " + this);
}
return range();
}
@Override
- public long doGet(TemporalAccessor temporal) {
+ public long getFrom(TemporalAccessor temporal) {
return temporal.getLong(EPOCH_DAY) + offset;
}
+ @SuppressWarnings("unchecked")
@Override
- public <R extends Temporal> R doWith(R temporal, long newValue) {
+ public <R extends Temporal> R adjustInto(R temporal, long newValue) {
if (range().isValidValue(newValue) == false) {
throw new DateTimeException("Invalid value: " + name + " " + newValue);
}
return (R) temporal.with(EPOCH_DAY, Math.subtractExact(newValue, offset));
}
//-----------------------------------------------------------------------
@Override
- public boolean resolve(DateTimeBuilder builder, long value) {
- boolean changed = false;
- changed = resolve0(JULIAN_DAY, builder, changed);
- changed = resolve0(MODIFIED_JULIAN_DAY, builder, changed);
- changed = resolve0(RATA_DIE, builder, changed);
- return changed;
- }
-
- private boolean resolve0(TemporalField field, DateTimeBuilder builder, boolean changed) {
- if (builder.containsFieldValue(field)) {
- builder.addCalendrical(LocalDate.ofEpochDay(Math.subtractExact(builder.getFieldValue(JULIAN_DAY), JULIAN_DAY_OFFSET)));
- builder.removeFieldValue(JULIAN_DAY);
- changed = true;
- }
- return changed;
+ public Map<TemporalField, Long> resolve(TemporalAccessor temporal, long value) {
+ return Collections.<TemporalField, Long>singletonMap(EPOCH_DAY, Math.subtractExact(value, offset));
}
//-----------------------------------------------------------------------
@Override
public String toString() {
- return getName();
+ return name;
}
}
}