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OffsetDateTimeDeserializer.java
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OffsetDateTimeDeserializer.java
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package cz.cvut.kbss.jsonld.deserialization.datetime;
import cz.cvut.kbss.jsonld.Configuration;
import cz.cvut.kbss.jsonld.JsonLd;
import cz.cvut.kbss.jsonld.deserialization.DeserializationContext;
import cz.cvut.kbss.jsonld.deserialization.ValueDeserializer;
import cz.cvut.kbss.jsonld.exception.JsonLdDeserializationException;
import java.time.OffsetDateTime;
import java.util.Map;
/**
* Deserializes values to {@link OffsetDateTime}.
* <p>
* If the value a number, it is taken as the number of milliseconds since the Unix Epoch. Otherwise, it is parsed as a
* string.
* <p>
* If a datetime pattern is configured ({@link cz.cvut.kbss.jsonld.ConfigParam#DATE_TIME_FORMAT}), it is used to parse
* the value. Otherwise, the default ISO-based pattern is used.
*/
public class OffsetDateTimeDeserializer implements ValueDeserializer<OffsetDateTime> {
private final StringBasedDateTimeResolver stringResolver = new StringBasedDateTimeResolver();
private final EpochBasedDateTimeResolver epochResolver = new EpochBasedDateTimeResolver();
@Override
public OffsetDateTime deserialize(Map<?, ?> jsonNode, DeserializationContext<OffsetDateTime> ctx) {
final Object value = getLiteralValue(jsonNode);
try {
return value instanceof Long ? epochResolver.resolve((Long) value) :
stringResolver.resolve(value.toString());
} catch (RuntimeException e) {
throw new JsonLdDeserializationException("Unable to deserialize datetime value.", e);
}
}
static Object getLiteralValue(Map<?, ?> jsonNode) {
final Object value = jsonNode.get(JsonLd.VALUE);
if (value == null) {
throw new JsonLdDeserializationException("Cannot deserialize node " + jsonNode + "as literal. " +
"It is missing attribute '" + JsonLd.VALUE + "'.");
}
return value;
}
@Override
public void configure(Configuration config) {
stringResolver.configure(config);
}
}