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ExpandedJsonLdDeserializer.java
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ExpandedJsonLdDeserializer.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.deserialization.expanded;
import cz.cvut.kbss.jsonld.Configuration;
import cz.cvut.kbss.jsonld.deserialization.DefaultInstanceBuilder;
import cz.cvut.kbss.jsonld.deserialization.DeserializationContext;
import cz.cvut.kbss.jsonld.deserialization.InstanceBuilder;
import cz.cvut.kbss.jsonld.deserialization.JsonLdDeserializer;
import cz.cvut.kbss.jsonld.deserialization.reference.PendingReferenceRegistry;
import cz.cvut.kbss.jsonld.exception.JsonLdDeserializationException;
import jakarta.json.JsonArray;
import jakarta.json.JsonObject;
import jakarta.json.JsonValue;
public class ExpandedJsonLdDeserializer extends JsonLdDeserializer {
public ExpandedJsonLdDeserializer() {
}
public ExpandedJsonLdDeserializer(Configuration configuration) {
super(configuration);
}
@Override
public <T> T deserialize(JsonValue jsonLd, Class<T> resultClass) {
if (jsonLd.getValueType() != JsonValue.ValueType.ARRAY) {
throw new JsonLdDeserializationException(
"Expanded JSON-LD deserializer requires a JSON-LD array as input.");
}
final JsonArray input = jsonLd.asJsonArray();
if (input.size() != 1) {
throw new JsonLdDeserializationException(
"Input is not expanded JSON-LD. The input does not contain exactly one root element.");
}
deserializers.configure(configuration());
final JsonObject root = input.getJsonObject(0);
final PendingReferenceRegistry referenceRegistry = new PendingReferenceRegistry();
if (deserializers.hasCustomDeserializer(resultClass)) {
final DeserializationContext<T> ctx = new DeserializationContext<>(resultClass, classResolver);
assert deserializers.getDeserializer(ctx).isPresent();
return deserializers.getDeserializer(ctx).get().deserialize(root, ctx);
}
final InstanceBuilder instanceBuilder = new DefaultInstanceBuilder(classResolver, referenceRegistry);
new ObjectDeserializer(instanceBuilder, new DeserializerConfig(configuration(), classResolver, deserializers), resultClass)
.processValue(root);
referenceRegistry.verifyNoUnresolvedReferencesExist();
assert resultClass.isAssignableFrom(instanceBuilder.getCurrentRoot().getClass());
return resultClass.cast(instanceBuilder.getCurrentRoot());
}
}