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InstantConverter.java
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InstantConverter.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
* <p>
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
* <p>
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.oom.converter.datetime;
import cz.cvut.kbss.jopa.datatype.xsd.XsdDateTimeMapper;
import cz.cvut.kbss.jopa.oom.converter.ConverterWrapper;
import cz.cvut.kbss.jopa.vocabulary.XSD;
import cz.cvut.kbss.ontodriver.model.Literal;
import java.time.Instant;
import java.time.OffsetDateTime;
/**
* Converts between Java 8 {@link Instant} and a supported xsd:dateTime representation.
* <p>
* This converter supports {@link OffsetDateTime} and {@link cz.cvut.kbss.ontodriver.model.Literal} as date time.
*/
public class InstantConverter implements ConverterWrapper<Instant, Object> {
@Override
public Literal convertToAxiomValue(Instant value) {
return fromInstant(value);
}
static Literal fromInstant(Instant value) {
assert value != null;
// Instant.toString formats the timestamp using ISO, that's what we want
return Literal.from(value.toString(), XSD.DATETIME);
}
@Override
public Instant convertToAttribute(Object value) {
assert value != null;
if (value instanceof OffsetDateTime) {
return offsetDateTimeToLiteral((OffsetDateTime) value);
} else {
assert value instanceof Literal;
final Literal literal = (Literal) value;
assert XSD.DATETIME.equals(literal.getDatatype());
return offsetDateTimeToLiteral(XsdDateTimeMapper.map(literal.getLexicalForm()));
}
}
private Instant offsetDateTimeToLiteral(OffsetDateTime value) {
return value.toInstant();
}
@Override
public boolean supportsAxiomValueType(Class<?> type) {
return OffsetDateTime.class.isAssignableFrom(type) || Literal.class.isAssignableFrom(type);
}
}