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handlebars.Java.CustomInstantDeserializer.mustache Maven / Gradle / Ivy
package {{invokerPackage}};
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonTokenId;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.datatype.threetenbp.DateTimeUtils;
import com.fasterxml.jackson.datatype.threetenbp.DecimalUtils;
import com.fasterxml.jackson.datatype.threetenbp.deser.ThreeTenDateTimeDeserializerBase;
import com.fasterxml.jackson.datatype.threetenbp.function.BiFunction;
import com.fasterxml.jackson.datatype.threetenbp.function.Function;
import org.threeten.bp.DateTimeException;
import org.threeten.bp.Instant;
import org.threeten.bp.OffsetDateTime;
import org.threeten.bp.ZoneId;
import org.threeten.bp.ZonedDateTime;
import org.threeten.bp.format.DateTimeFormatter;
import org.threeten.bp.temporal.Temporal;
import org.threeten.bp.temporal.TemporalAccessor;
import java.io.IOException;
import java.math.BigDecimal;
/**
* Deserializer for ThreeTen temporal {@link Instant}s, {@link OffsetDateTime}, and {@link ZonedDateTime}s.
* Adapted from the jackson threetenbp InstantDeserializer to add support for deserializing rfc822 format.
*
* @author Nick Williams
*/
public class CustomInstantDeserializer
extends ThreeTenDateTimeDeserializerBase {
private static final long serialVersionUID = 1L;
public static final CustomInstantDeserializer INSTANT = new CustomInstantDeserializer(
Instant.class, DateTimeFormatter.ISO_INSTANT,
new Function() {
@Override
public Instant apply(TemporalAccessor temporalAccessor) {
return Instant.from(temporalAccessor);
}
},
new Function() {
@Override
public Instant apply(FromIntegerArguments a) {
return Instant.ofEpochMilli(a.value);
}
},
new Function() {
@Override
public Instant apply(FromDecimalArguments a) {
return Instant.ofEpochSecond(a.integer, a.fraction);
}
},
null
);
public static final CustomInstantDeserializer OFFSET_DATE_TIME = new CustomInstantDeserializer(
OffsetDateTime.class, DateTimeFormatter.ISO_OFFSET_DATE_TIME,
new Function() {
@Override
public OffsetDateTime apply(TemporalAccessor temporalAccessor) {
return OffsetDateTime.from(temporalAccessor);
}
},
new Function() {
@Override
public OffsetDateTime apply(FromIntegerArguments a) {
return OffsetDateTime.ofInstant(Instant.ofEpochMilli(a.value), a.zoneId);
}
},
new Function() {
@Override
public OffsetDateTime apply(FromDecimalArguments a) {
return OffsetDateTime.ofInstant(Instant.ofEpochSecond(a.integer, a.fraction), a.zoneId);
}
},
new BiFunction() {
@Override
public OffsetDateTime apply(OffsetDateTime d, ZoneId z) {
return d.withOffsetSameInstant(z.getRules().getOffset(d.toLocalDateTime()));
}
}
);
public static final CustomInstantDeserializer ZONED_DATE_TIME = new CustomInstantDeserializer(
ZonedDateTime.class, DateTimeFormatter.ISO_ZONED_DATE_TIME,
new Function() {
@Override
public ZonedDateTime apply(TemporalAccessor temporalAccessor) {
return ZonedDateTime.from(temporalAccessor);
}
},
new Function() {
@Override
public ZonedDateTime apply(FromIntegerArguments a) {
return ZonedDateTime.ofInstant(Instant.ofEpochMilli(a.value), a.zoneId);
}
},
new Function() {
@Override
public ZonedDateTime apply(FromDecimalArguments a) {
return ZonedDateTime.ofInstant(Instant.ofEpochSecond(a.integer, a.fraction), a.zoneId);
}
},
new BiFunction() {
@Override
public ZonedDateTime apply(ZonedDateTime zonedDateTime, ZoneId zoneId) {
return zonedDateTime.withZoneSameInstant(zoneId);
}
}
);
protected final Function fromMilliseconds;
protected final Function fromNanoseconds;
protected final Function parsedToValue;
protected final BiFunction adjust;
protected CustomInstantDeserializer(Class supportedType,
DateTimeFormatter parser,
Function parsedToValue,
Function fromMilliseconds,
Function fromNanoseconds,
BiFunction adjust) {
super(supportedType, parser);
this.parsedToValue = parsedToValue;
this.fromMilliseconds = fromMilliseconds;
this.fromNanoseconds = fromNanoseconds;
this.adjust = adjust == null ? new BiFunction() {
@Override
public T apply(T t, ZoneId zoneId) {
return t;
}
} : adjust;
}
@SuppressWarnings("unchecked")
protected CustomInstantDeserializer(CustomInstantDeserializer base, DateTimeFormatter f) {
super((Class) base.handledType(), f);
parsedToValue = base.parsedToValue;
fromMilliseconds = base.fromMilliseconds;
fromNanoseconds = base.fromNanoseconds;
adjust = base.adjust;
}
@Override
protected JsonDeserializer withDateFormat(DateTimeFormatter dtf) {
if (dtf == _formatter) {
return this;
}
return new CustomInstantDeserializer(this, dtf);
}
@Override
public T deserialize(JsonParser parser, DeserializationContext context) throws IOException {
//NOTE: Timestamps contain no timezone info, and are always in configured TZ. Only
//string values have to be adjusted to the configured TZ.
switch (parser.getCurrentTokenId()) {
case JsonTokenId.ID_NUMBER_FLOAT: {
BigDecimal value = parser.getDecimalValue();
long seconds = value.longValue();
int nanoseconds = DecimalUtils.extractNanosecondDecimal(value, seconds);
return fromNanoseconds.apply(new FromDecimalArguments(
seconds, nanoseconds, getZone(context)));
}
case JsonTokenId.ID_NUMBER_INT: {
long timestamp = parser.getLongValue();
if (context.isEnabled(DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS)) {
return this.fromNanoseconds.apply(new FromDecimalArguments(
timestamp, 0, this.getZone(context)
));
}
return this.fromMilliseconds.apply(new FromIntegerArguments(
timestamp, this.getZone(context)
));
}
case JsonTokenId.ID_STRING: {
String string = parser.getText().trim();
if (string.length() == 0) {
return null;
}
if (string.endsWith("+0000")) {
string = string.substring(0, string.length() - 5) + "Z";
}
T value;
try {
TemporalAccessor acc = _formatter.parse(string);
value = parsedToValue.apply(acc);
if (context.isEnabled(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE)) {
return adjust.apply(value, this.getZone(context));
}
} catch (DateTimeException e) {
throw _peelDTE(e);
}
return value;
}
}
throw context.mappingException("Expected type float, integer, or string.");
}
private ZoneId getZone(DeserializationContext context) {
// Instants are always in UTC, so don't waste compute cycles
return (_valueClass == Instant.class) ? null : DateTimeUtils.timeZoneToZoneId(context.getTimeZone());
}
private static class FromIntegerArguments {
public final long value;
public final ZoneId zoneId;
private FromIntegerArguments(long value, ZoneId zoneId) {
this.value = value;
this.zoneId = zoneId;
}
}
private static class FromDecimalArguments {
public final long integer;
public final int fraction;
public final ZoneId zoneId;
private FromDecimalArguments(long integer, int fraction, ZoneId zoneId) {
this.integer = integer;
this.fraction = fraction;
this.zoneId = zoneId;
}
}
}
