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CompactedJsonLdSerializer.java
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CompactedJsonLdSerializer.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;
import cz.cvut.kbss.jsonld.ConfigParam;
import cz.cvut.kbss.jsonld.Configuration;
import cz.cvut.kbss.jsonld.serialization.context.DummyJsonLdContext;
import cz.cvut.kbss.jsonld.serialization.model.JsonNode;
import cz.cvut.kbss.jsonld.serialization.serializer.LiteralValueSerializers;
import cz.cvut.kbss.jsonld.serialization.serializer.ObjectGraphValueSerializers;
import cz.cvut.kbss.jsonld.serialization.serializer.ValueSerializers;
import cz.cvut.kbss.jsonld.serialization.serializer.compact.*;
import cz.cvut.kbss.jsonld.serialization.serializer.compact.datetime.TemporalAmountSerializer;
import cz.cvut.kbss.jsonld.serialization.serializer.compact.datetime.TemporalSerializer;
import cz.cvut.kbss.jsonld.serialization.serializer.datetime.DateSerializer;
import cz.cvut.kbss.jsonld.serialization.traversal.ObjectGraphTraverser;
import cz.cvut.kbss.jsonld.serialization.traversal.SerializationContextFactory;
import java.time.*;
import java.util.Date;
/**
* JSON-LD serializer outputting compacted context-less JSON-LD.
* <p>
* This means that context info is not used and all attributes are mapped by their full URIs.
*/
public class CompactedJsonLdSerializer extends JsonLdSerializer {
public CompactedJsonLdSerializer(JsonGenerator jsonGenerator) {
super(jsonGenerator);
}
public CompactedJsonLdSerializer(JsonGenerator jsonGenerator, Configuration configuration) {
super(jsonGenerator, configuration);
}
@Override
protected ValueSerializers initSerializers() {
final LiteralValueSerializers valueSerializers =
new LiteralValueSerializers(new DefaultValueSerializer(new MultilingualStringSerializer()));
valueSerializers.registerIdentifierSerializer(new IdentifierSerializer());
valueSerializers.registerTypesSerializer(new TypesSerializer());
valueSerializers.registerIndividualSerializer(new IndividualSerializer());
final TemporalSerializer ts = new TemporalSerializer();
valueSerializers.registerSerializer(LocalDate.class, ts);
// Register the same temporal serializer for each of the types it supports (needed for key-based map access)
valueSerializers.registerSerializer(LocalDate.class, ts);
valueSerializers.registerSerializer(LocalTime.class, ts);
valueSerializers.registerSerializer(OffsetTime.class, ts);
valueSerializers.registerSerializer(LocalDateTime.class, ts);
valueSerializers.registerSerializer(OffsetDateTime.class, ts);
valueSerializers.registerSerializer(ZonedDateTime.class, ts);
valueSerializers.registerSerializer(Instant.class, ts);
valueSerializers.registerSerializer(Date.class, new DateSerializer(ts));
final TemporalAmountSerializer tas = new TemporalAmountSerializer();
valueSerializers.registerSerializer(Duration.class, tas);
valueSerializers.registerSerializer(Period.class, tas);
return valueSerializers;
}
@Override
protected JsonNode buildJsonTree(Object root) {
final ObjectGraphTraverser traverser = new ObjectGraphTraverser(new SerializationContextFactory(
DummyJsonLdContext.INSTANCE));
traverser.setRequireId(configuration().is(ConfigParam.REQUIRE_ID));
final JsonLdTreeBuilder treeBuilder = initTreeBuilder(traverser);
traverser.setVisitor(treeBuilder);
traverser.traverse(root);
return treeBuilder.getTreeRoot();
}
private JsonLdTreeBuilder initTreeBuilder(ObjectGraphTraverser traverser) {
final ObjectPropertyValueSerializer opSerializer = new ObjectPropertyValueSerializer(traverser);
opSerializer.configure(configuration());
return new JsonLdTreeBuilder(new ObjectGraphValueSerializers(serializers, opSerializer),
DummyJsonLdContext.INSTANCE);
}
}