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JacksonJsonLdSerializer.java
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JacksonJsonLdSerializer.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.jackson.serialization;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import cz.cvut.kbss.jsonld.Configuration;
import cz.cvut.kbss.jsonld.serialization.JsonLdSerializer;
import cz.cvut.kbss.jsonld.serialization.serializer.ValueSerializer;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
class JacksonJsonLdSerializer<T> extends JsonSerializer<T> {
private final Configuration configuration;
private final Map<Class<?>, ValueSerializer<?>> commonSerializers;
private final JsonSerializer<T> baseSerializer;
JacksonJsonLdSerializer(Configuration configuration, Map<Class<?>, ValueSerializer<?>> commonSerializers,
JsonSerializer<T> baseSerializer) {
this.configuration = configuration;
this.commonSerializers = commonSerializers;
this.baseSerializer = baseSerializer;
}
@Override
public void serialize(T value, JsonGenerator jsonGenerator,
SerializerProvider serializerProvider) throws IOException {
if (shouldUseBaseSerializer(value)) {
baseSerializer.serialize(value, jsonGenerator, serializerProvider);
}
final JsonLdSerializer serializer = createSerializer(jsonGenerator);
serializer.serialize(value);
}
private boolean shouldUseBaseSerializer(T value) {
if (!(value instanceof Collection)) {
return false;
}
final Collection<?> col = (Collection<?>) value;
if (col.isEmpty()) {
return false;
}
// Peek at the first element to see if we should handle it
final Object firstElem = col.iterator().next();
return firstElem == null || !JsonLdSerializerModifier.isJsonLdCompatible(firstElem.getClass());
}
private JsonLdSerializer createSerializer(JsonGenerator jsonGenerator) {
final cz.cvut.kbss.jsonld.serialization.JsonGenerator writer = new JacksonJsonWriter(jsonGenerator);
final JsonLdSerializer serializer;
if (SerializationConstants.FORM_COMPACT_WITH_CONTEXT.equals(
configuration.get(SerializationConstants.FORM, SerializationConstants.FORM_COMPACT))) {
serializer =
JsonLdSerializer.createContextBuildingJsonLdSerializer(writer, new Configuration(configuration));
} else {
serializer = JsonLdSerializer.createCompactedJsonLdSerializer(writer, new Configuration(configuration));
}
commonSerializers.forEach((type, valueSerializer) -> serializer.registerSerializer((Class) type,
(ValueSerializer) valueSerializer));
return serializer;
}
@Override
public void serializeWithType(T value, JsonGenerator gen, SerializerProvider serializers,
TypeSerializer typeSer) throws IOException {
serialize(value, gen, serializers);
}
}