nl.vpro.domain.media.bind.GenreSortedSet Maven / Gradle / Ivy

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The basic domain classes for 'media', the core of POMS. Also, the 'update' XML bindings for it. It also contains some closely related domain classes like the enum to contain NICAM kijkwijzer settings.

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package nl.vpro.domain.media.bind;

import java.io.IOException;
import java.util.SortedSet;
import java.util.TreeSet;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.node.ArrayNode;

import nl.vpro.domain.bind.AbstractJsonIterable;
import nl.vpro.domain.media.Genre;
import nl.vpro.jackson2.Jackson2Mapper;

/**
 * Might not be needed.
 * @author Michiel Meeuwissen
 * @since 5.12
 */
public class GenreSortedSet {

    private static final ObjectMapper MAPPER = Jackson2Mapper.getInstance();

    public static class Serializer extends JsonSerializer> {

        @Override
        public boolean isEmpty(SerializerProvider provider, SortedSet value) {
            return AbstractJsonIterable.defaultIsEmpty(provider, value);

        }

        @Override
        public void serialize(SortedSet genres, JsonGenerator jgen, SerializerProvider serializerProvider) throws IOException {
            jgen.writeStartArray();
            for (Genre gt : genres) {
                jgen.writeObject(gt);
            }
            jgen.writeEndArray();
        }

    }

    public static class Deserializer extends JsonDeserializer> {

        @Override
        public Iterable deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
            ObjectCodec codec = jp.getCodec();
            if (codec == null) {
                // In org/ektorp/impl/QueryResultParser.java#parseRows(JsonParser jp) it does row.doc.traverse()
                // traverse() gives a new JsonParser, but without the original Codec. Seems a bug. But this work around it.
                jp.setCodec(MAPPER);
                codec = jp.getCodec();
            }

            final SortedSet types = new TreeSet<>();

            final ArrayNode array = jp.readValueAs(ArrayNode.class);
            for (JsonNode jsonNode : array) {
                Genre type = codec.treeToValue(jsonNode, Genre.class);
                types.add(type);
            }
            return types;
        }
    }
}