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ContextBuildingDefaultValueSerializer.java
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ContextBuildingDefaultValueSerializer.java
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package cz.cvut.kbss.jsonld.serialization.serializer.context;
import cz.cvut.kbss.jopa.model.MultilingualString;
import cz.cvut.kbss.jsonld.JsonLd;
import cz.cvut.kbss.jsonld.serialization.JsonNodeFactory;
import cz.cvut.kbss.jsonld.serialization.model.CollectionNode;
import cz.cvut.kbss.jsonld.serialization.model.JsonNode;
import cz.cvut.kbss.jsonld.serialization.model.ObjectNode;
import cz.cvut.kbss.jsonld.serialization.serializer.SerializerUtils;
import cz.cvut.kbss.jsonld.serialization.serializer.ValueSerializer;
import cz.cvut.kbss.jsonld.serialization.traversal.SerializationContext;
import java.util.Collection;
/**
* Default serializer for non-object property values.
*/
public class ContextBuildingDefaultValueSerializer implements ValueSerializer {
private final ValueSerializer<MultilingualString> multilingualStringValueSerializer;
private final ValueSerializer<Collection<MultilingualString>> pluralMultilingualSerializer;
public ContextBuildingDefaultValueSerializer(ValueSerializer<MultilingualString> multilingualStringValueSerializer,
ValueSerializer<Collection<MultilingualString>> pluralMultilingualSerializer) {
this.multilingualStringValueSerializer = multilingualStringValueSerializer;
this.pluralMultilingualSerializer = pluralMultilingualSerializer;
}
@Override
public JsonNode serialize(Object value, SerializationContext ctx) {
if (value instanceof Collection) {
final Collection<?> col = (Collection<?>) value;
if (col.isEmpty()) {
return JsonNodeFactory.createCollectionNode(ctx.getTerm(), col);
}
final Object elem = col.iterator().next();
if (SerializerUtils.isAnnotationReference(elem, ctx)) {
return serializeReferences(col, ctx);
} else if (elem instanceof MultilingualString) {
return pluralMultilingualSerializer.serialize((Collection<MultilingualString>) col, ctx);
} else {
return serializeLiterals(col, ctx);
}
} else {
if (SerializerUtils.isAnnotationReference(value, ctx)) {
return serializeReference(value, ctx);
} else if (value instanceof MultilingualString) {
return multilingualStringValueSerializer.serialize((MultilingualString) value, ctx);
} else {
if (ctx.getField() != null) {
ctx.registerTermMapping(ctx.getFieldName(), ctx.getTerm());
}
return JsonNodeFactory.createLiteralNode(ctx.getTerm(), value);
}
}
}
private static JsonNode serializeReferences(Collection<?> elems, SerializationContext<?> ctx) {
ctx.registerTermMapping(ctx.getFieldName(), ctx.getTerm());
final CollectionNode<?> result = JsonNodeFactory.createCollectionNode(ctx.getTerm(), elems);
elems.forEach(
e -> result.addItem(serializeReference(e, new SerializationContext<>(e, ctx.getJsonLdContext()))));
return result;
}
private static JsonNode serializeReference(Object value, SerializationContext<?> ctx) {
final ObjectNode node;
if (ctx.getTerm() != null) {
ctx.registerTermMapping(ctx.getFieldName(), ctx.getTerm());
node = JsonNodeFactory.createObjectNode(ctx.getTerm());
} else {
node = JsonNodeFactory.createObjectNode();
}
node.addItem(JsonNodeFactory.createLiteralNode(JsonLd.ID, value));
return node;
}
private static JsonNode serializeLiterals(Collection<?> elems, SerializationContext<?> ctx) {
ctx.registerTermMapping(ctx.getFieldName(), ctx.getTerm());
final CollectionNode<?> result = JsonNodeFactory.createCollectionNode(ctx.getTerm(), elems);
elems.forEach(e -> result.addItem(JsonNodeFactory.createLiteralNode(e)));
return result;
}
}