io.dropwizard.jdbi.args.InstantMapper Maven / Gradle / Ivy
package io.dropwizard.jdbi.args;
import org.skife.jdbi.v2.StatementContext;
import org.skife.jdbi.v2.tweak.ResultColumnMapper;
import javax.annotation.Nullable;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.time.Instant;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Optional;
import java.util.TimeZone;
/**
* A {@link ResultColumnMapper} to map {@link Instant} objects.
*/
public class InstantMapper implements ResultColumnMapper {
/**
* {@link Calendar} for representing a database time zone.
* If a field is not represented in a database as
* {@code TIMESTAMP WITH TIME ZONE}, we need to set its time zone
* explicitly. Otherwise it will not be correctly represented in
* a time zone different from the time zone of the database.
*/
private final Optional calendar;
public InstantMapper() {
this(Optional.empty());
}
public InstantMapper(final Optional tz) {
this.calendar = tz.map(GregorianCalendar::new);
}
@Override
@Nullable
public Instant mapColumn(ResultSet r, int columnNumber, StatementContext ctx) throws SQLException {
final Optional instance = cloneCalendar();
final Timestamp timestamp = instance.isPresent() ?
r.getTimestamp(columnNumber, instance.get()) :
r.getTimestamp(columnNumber);
return timestamp == null ? null : timestamp.toInstant();
}
@Override
@Nullable
public Instant mapColumn(ResultSet r, String columnLabel, StatementContext ctx) throws SQLException {
final Optional instance = cloneCalendar();
final Timestamp timestamp = instance.isPresent() ?
r.getTimestamp(columnLabel, instance.get()) :
r.getTimestamp(columnLabel);
return timestamp == null ? null : timestamp.toInstant();
}
private Optional cloneCalendar() {
return calendar.map(Calendar::clone).map(x -> (Calendar) x);
}
}