de.ingogriebsch.spring.hateoas.siren.SirenRepresentationModelDeserializer Maven / Gradle / Ivy

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A library implementing Siren as a custom Spring HATEOAS hypermedia type. Siren is a hypermedia specification for representing entities.
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/*-
 * Copyright 2019-2020 the original author or 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 de.ingogriebsch.spring.hateoas.siren;

import static com.fasterxml.jackson.databind.type.TypeFactory.defaultInstance;
import static com.google.common.collect.Maps.newHashMap;
import static de.ingogriebsch.spring.hateoas.siren.SirenRepresentationModelBuilder.builder;

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

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonDeserializer;
import org.springframework.hateoas.RepresentationModel;
import org.springframework.lang.Nullable;

/**
 * {@link JsonDeserializer} implementation which is able to deserialize a Siren entity into a {@link RepresentationModel}.
 * 
 * @author Ingo Griebsch
 * @since 1.0.0
 * @see RepresentationModel
 */
class SirenRepresentationModelDeserializer extends AbstractSirenDeserializer> {

    private static final long serialVersionUID = -3683235541542548855L;
    private static final JavaType TYPE = defaultInstance().constructType(RepresentationModel.class);

    SirenRepresentationModelDeserializer(SirenConfiguration configuration, SirenDeserializerFacilities deserializerFacilities) {
        this(configuration, deserializerFacilities, TYPE);
    }

    SirenRepresentationModelDeserializer(SirenConfiguration configuration, SirenDeserializerFacilities deserializerFacilities,
        JavaType contentType) {
        super(configuration, deserializerFacilities, contentType);
    }

    @Override
    public JsonDeserializer createContextual(DeserializationContext ctxt, @Nullable BeanProperty property) {
        JavaType contentType = property == null ? ctxt.getContextualType() : property.getType().getContentType();
        return new SirenRepresentationModelDeserializer(configuration, deserializerFacilities, contentType);
    }

    @Override
    protected RepresentationModel deserializeModel(JsonParser jp, DeserializationContext ctxt) throws IOException {
        SirenEntity sirenEntity = jp.getCodec().readValue(jp, SirenEntity.class);

        SirenRepresentationModelBuilder builder =
            builder(contentType, getRepresentationModelFactories().forRepresentationModel(), getLinkConverter());

        return builder.properties(properties(sirenEntity)) //
            .links(sirenEntity.getLinks()) //
            .actions(sirenEntity.getActions()) //
            .build();
    }

    @SuppressWarnings("unchecked")
    private Map properties(SirenEntity sirenEntity) {
        Object properties = sirenEntity.getProperties();
        if (properties == null) {
            return newHashMap();
        }

        if (Map.class.isAssignableFrom(properties.getClass())) {
            return (Map) properties;
        }
        return extractProperties(properties);
    }
}