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ObjectPropertyValueSerializer.java
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ObjectPropertyValueSerializer.java
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/**
* Copyright (C) 2022 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.jsonld.serialization.serializer.compact;
import cz.cvut.kbss.jopa.model.annotations.Individual;
import cz.cvut.kbss.jsonld.JsonLd;
import cz.cvut.kbss.jsonld.exception.InvalidEnumMappingException;
import cz.cvut.kbss.jsonld.exception.JsonLdSerializationException;
import cz.cvut.kbss.jsonld.serialization.JsonNodeFactory;
import cz.cvut.kbss.jsonld.serialization.model.JsonNode;
import cz.cvut.kbss.jsonld.serialization.model.ObjectNode;
import cz.cvut.kbss.jsonld.serialization.serializer.ValueSerializer;
import cz.cvut.kbss.jsonld.serialization.traversal.ObjectGraphTraverser;
import cz.cvut.kbss.jsonld.serialization.traversal.SerializationContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Field;
/**
* Value serializer for object property values.
*/
public class ObjectPropertyValueSerializer implements ValueSerializer {
private static final Logger LOG = LoggerFactory.getLogger(ObjectPropertyValueSerializer.class);
private final ObjectGraphTraverser graphTraverser;
public ObjectPropertyValueSerializer(ObjectGraphTraverser graphTraverser) {
this.graphTraverser = graphTraverser;
}
@Override
public JsonNode serialize(Object value, SerializationContext ctx) {
if (value.getClass().isEnum()) {
return serializeEnumConstant((Enum<?>) value, ctx);
}
graphTraverser.traverse(ctx);
return null;
}
private JsonNode serializeEnumConstant(Enum<?> constant, SerializationContext<?> ctx) {
final String iri = resolveMappedIndividual(constant);
final ObjectNode node = JsonNodeFactory.createObjectNode(ctx.getTerm());
node.addItem(JsonNodeFactory.createObjectIdNode(JsonLd.ID, iri));
return node;
}
private String resolveMappedIndividual(Enum<?> value) {
try {
for (Field f : value.getDeclaringClass().getDeclaredFields()) {
if (!f.isEnumConstant()) {
continue;
}
final Individual individual = f.getAnnotation(Individual.class);
if (individual == null) {
LOG.warn(
"Enum constant {} is missing individual mapping, yet it can be used as object property value.",
value);
continue;
}
if (value == f.get(null)) {
return individual.iri();
}
}
} catch (IllegalAccessException e) {
// This should not happen
throw new JsonLdSerializationException("Unable to access enum constant!", e);
}
throw new InvalidEnumMappingException("Missing individual mapping for enum constant " + value);
}
}