io.micronaut.serde.support.deserializers.collect.SpecificOnlyMapDeserializer Maven / Gradle / Ivy

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/*
 * Copyright 2017-2024 original authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.micronaut.serde.support.deserializers.collect;

import io.micronaut.core.annotation.Internal;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.type.Argument;
import io.micronaut.serde.Decoder;
import io.micronaut.serde.Deserializer;
import io.micronaut.serde.exceptions.SerdeException;
import io.micronaut.serde.support.DeserializerRegistrar;
import io.micronaut.serde.util.CustomizableDeserializer;

import java.io.IOException;
import java.util.Map;

@Internal
abstract class SpecificOnlyMapDeserializer> implements CustomizableDeserializer, DeserializerRegistrar {

    private final Class type;

    SpecificOnlyMapDeserializer(Class type) {
        this.type = type;
    }

    @Override
    public Deserializer createSpecific(DecoderContext context, Argument type) throws SerdeException {
        final Argument[] generics = type.getTypeParameters();
        if (generics.length == 2) {
            @SuppressWarnings("unchecked") final Argument keyType = (Argument) generics[0];
            @SuppressWarnings("unchecked") final Argument valueType = (Argument) generics[1];
            final Deserializer valueDeser = valueType.equalsType(Argument.OBJECT_ARGUMENT) ? null : context.findDeserializer(valueType)
                .createSpecific(context, valueType);
            return createSpecific(keyType, valueType, valueDeser);
        }
        return new Deserializer<>() {

            @Override
            public M deserialize(Decoder decoder, DecoderContext decoderContext, Argument type) throws IOException {
                // raw map
                final Object o = decoder.decodeArbitrary();
                if (type.isInstance(o)) {
                    return (M) o;
                } else if (o instanceof Map) {
                    final M map = getDefaultValue(decoderContext, type);
                    map.putAll((Map) o);
                    return map;
                } else {
                    throw new SerdeException("Cannot deserialize map of type [" + type + "] from value: " + o);
                }
            }

        };
    }

    @NonNull
    protected abstract Deserializer createSpecific(Argument keyType, Argument valueType, Deserializer valueDeser);

    @Override
    public Argument getType() {
        return (Argument) Argument.of(type, Argument.ofTypeVariable(Object.class, "K"), Argument.ofTypeVariable(Object.class, "V"));
    }
}