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JsonLdSerializer.java
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JsonLdSerializer.java
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/**
* Copyright (C) 2017 Czech Technical University in Prague
*
* 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.
*
* 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.Configuration;
import cz.cvut.kbss.jsonld.common.Configurable;
import cz.cvut.kbss.jsonld.serialization.model.JsonNode;
import cz.cvut.kbss.jsonld.serialization.traversal.ObjectGraphTraverser;
import java.util.Objects;
/**
* Base class for all JSON-LD serializers.
* <p>
* The serializers will mostly differ in the form of the generated JSON. E.g. the output can be expanded, using contexts
* etc.
*/
public abstract class JsonLdSerializer implements Configurable {
private final Configuration configuration;
final ObjectGraphTraverser traverser = new ObjectGraphTraverser();
final JsonGenerator jsonGenerator;
protected JsonLdSerializer(JsonGenerator jsonGenerator) {
this.jsonGenerator = Objects.requireNonNull(jsonGenerator);
this.configuration = new Configuration();
}
public JsonLdSerializer(JsonGenerator jsonGenerator, Configuration configuration) {
this.jsonGenerator = Objects.requireNonNull(jsonGenerator);
this.configuration = Objects.requireNonNull(configuration);
}
@Override
public Configuration configure() {
return configuration;
}
/**
* Serializes object graph with the specified root.
* <p>
* The serialization builds a JSON-LD tree model and then writes it using a {@link JsonGenerator}, which was
* passed to this instance in constructor.
*
* @param root Object graph root
*/
public void serialize(Object root) {
Objects.requireNonNull(root);
final JsonNode jsonRoot = buildJsonTree(root);
jsonRoot.write(jsonGenerator);
}
/**
* Builds the JSON-LD tree model.
*
* @param root Object graph root
* @return {@link JsonNode} corresponding to the JSON-LD's tree root
*/
abstract JsonNode buildJsonTree(Object root);
public static JsonLdSerializer createCompactedJsonLdSerializer(JsonGenerator jsonWriter) {
return new CompactedJsonLdSerializer(jsonWriter);
}
public static JsonLdSerializer createCompactedJsonLdSerializer(JsonGenerator jsonWriter,
Configuration configuration) {
return new CompactedJsonLdSerializer(jsonWriter, configuration);
}
}