io.fabric8.kubernetes.model.jackson.JsonUnwrappedDeserializer Maven / Gradle / Ivy

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/**
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * 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
 *
 *         http://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.fabric8.kubernetes.model.jackson;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;

import com.fasterxml.jackson.annotation.JsonUnwrapped;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.BeanDescription;
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 com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import com.fasterxml.jackson.databind.deser.ResolvableDeserializer;
import com.fasterxml.jackson.databind.introspect.BeanPropertyDefinition;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.node.TreeTraversingParser;
import com.fasterxml.jackson.databind.util.NameTransformer;

/**
 * Desc: this is a workaround on the problem that Jackson's @JsonUnwrapped doesn't work with
 * polymorphism (@JsonTypeInfo)
 * Adapted from https://stackoverflow.com/questions/37423848/deserializing-polymorphic-types-with-jsonunwrapped-using-jackson
 */
public class JsonUnwrappedDeserializer extends JsonDeserializer implements ContextualDeserializer {

  private static JsonUnwrapped cancelUnwrappedAnnotation;

  static {
    try {
      cancelUnwrappedAnnotation = CancelUnwrapped.class.getField("dummy").getAnnotation(JsonUnwrapped.class);
    } catch (NoSuchFieldException ex) {
      // this exception will never happen, though:
      throw new RuntimeException(ex);
    }
  }

  private JsonDeserializer beanDeserializer;
  private Set ownPropertyNames;
  private String unwrappedPropertyName;
  private NameTransformer nameTransformer;

  /*
   * Needed by Jackson
   */
  public JsonUnwrappedDeserializer() {
  }

  public JsonUnwrappedDeserializer(DeserializationContext deserializationContext) throws JsonMappingException {
    JavaType type = deserializationContext.getContextualType();

    BeanDescription description = deserializationContext.getConfig().introspect(type);

    final JsonUnwrapped[] tempUnwrappedAnnotation = {null};

    List unwrappedProperties = description.findProperties().stream().filter(prop ->
      Arrays.asList(prop.getConstructorParameter(), prop.getMutator(), prop.getField()).stream()
        .filter(Objects::nonNull)
        .anyMatch(member -> {
          JsonUnwrapped unwrappedAnnotation = member.getAnnotation(JsonUnwrapped.class);
          if (unwrappedAnnotation != null) {
            tempUnwrappedAnnotation[0] = unwrappedAnnotation;
            member.getAllAnnotations().add(cancelUnwrappedAnnotation);
          }
          return unwrappedAnnotation != null;
        })).collect(Collectors.toList());

    if (unwrappedProperties.isEmpty()) {
      throw new UnsupportedOperationException("@JsonUnwrapped properties not found in " + type.getTypeName());
    } else if (unwrappedProperties.size() > 1) {
      throw new UnsupportedOperationException("Multiple @JsonUnwrapped properties found in " + type.getTypeName());
    }

    BeanPropertyDefinition unwrappedProperty = unwrappedProperties.get(0);

    nameTransformer = NameTransformer.simpleTransformer(tempUnwrappedAnnotation[0].prefix(), tempUnwrappedAnnotation[0].suffix());

    unwrappedPropertyName = unwrappedProperty.getName();

    ownPropertyNames = description.findProperties().stream().map(BeanPropertyDefinition::getName).collect(Collectors.toSet());
    ownPropertyNames.remove(unwrappedPropertyName);
    ownPropertyNames.removeAll(description.getIgnoredPropertyNames());

    JsonDeserializer