io.prestosql.jdbc.$internal.jackson.datatype.jdk8.OptionalDeserializer Maven / Gradle / Ivy

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package io.prestosql.jdbc.$internal.jackson.datatype.jdk8;

import java.util.Optional;

import io.prestosql.jdbc.$internal.jackson.databind.*;
import io.prestosql.jdbc.$internal.jackson.databind.deser.ValueInstantiator;
import io.prestosql.jdbc.$internal.jackson.databind.deser.std.ReferenceTypeDeserializer;
import io.prestosql.jdbc.$internal.jackson.databind.jsontype.TypeDeserializer;

final class OptionalDeserializer
    extends ReferenceTypeDeserializer>
{
    private static final long serialVersionUID = 1L;

    /*
    /**********************************************************
    /* Life-cycle
    /**********************************************************
     */

    /**
     * @since 2.9
     */
    public OptionalDeserializer(JavaType fullType, ValueInstantiator inst,
            TypeDeserializer typeDeser, JsonDeserializer deser)
    {
        super(fullType, inst, typeDeser, deser);
    }

    /*
    /**********************************************************
    /* Abstract method implementations
    /**********************************************************
     */

    @Override
    public OptionalDeserializer withResolved(TypeDeserializer typeDeser, JsonDeserializer valueDeser) {
        return new OptionalDeserializer(_fullType, _valueInstantiator,
                typeDeser, valueDeser);
    }

    @Override
    public Optional getNullValue(DeserializationContext ctxt) throws JsonMappingException {
        // 07-May-2019, tatu: [databind#2303], needed for nested ReferenceTypes
        return Optional.ofNullable(_valueDeserializer.getNullValue(ctxt));
    }

    @Override
    public Object getEmptyValue(DeserializationContext ctxt) throws JsonMappingException {
        // 07-May-2019, tatu: I _think_ this needs to align with "null value" and
        //    not necessarily with empty value of contents? (used to just do "absent"
        //    so either way this seems to me like an improvement)
        return getNullValue(ctxt);
    }

    @Override
    public Optional referenceValue(Object contents) {
        return Optional.ofNullable(contents);
    }

    @Override
    public Object getReferenced(Optional reference) {
        return reference.get();
    }

    @Override // since 2.9
    public Optional updateReference(Optional reference, Object contents) {
        return Optional.ofNullable(contents);
    }

    // Default ought to be fine:
//    public Boolean supportsUpdate(DeserializationConfig config) { }

}