discord4j.common.jackson.PossibleDeserializer Maven / Gradle / Ivy

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/*
 * This file is part of Discord4J.
 *
 * Discord4J is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Discord4J 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Discord4J.  If not, see .
 */
package discord4j.common.jackson;

import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.deser.ValueInstantiator;
import com.fasterxml.jackson.databind.deser.std.ReferenceTypeDeserializer;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;

import javax.annotation.Nullable;

public class PossibleDeserializer extends ReferenceTypeDeserializer> {

    PossibleDeserializer(JavaType fullType, @Nullable ValueInstantiator vi, TypeDeserializer typeDeser,
                         JsonDeserializer deser) {
        super(fullType, vi, typeDeser, deser);
    }

    @Override
    protected ReferenceTypeDeserializer> withResolved(TypeDeserializer typeDeser,
                                                                  JsonDeserializer valueDeser) {
        return new PossibleDeserializer(_fullType, _valueInstantiator, typeDeser, valueDeser);
    }

    @Nullable
    @Override
    public Possible getNullValue(DeserializationContext ctxt) {
        return null;
    }

    @Override
    public Possible referenceValue(Object contents) {
        return Possible.of(contents);
    }

    @Override
    public Possible updateReference(Possible reference, Object contents) {
        return Possible.of(contents);
    }

    @Nullable
    @Override
    public Object getReferenced(Possible reference) {
        return reference.isAbsent() ? null : reference.get();
    }
}