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Jersey Integrations
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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 David Berkman
 *
 * This file is part of the SmallMind Code Project.
 *
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 *
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * ...or...
 *
 * 2) The terms of the Apache License, Version 2.0.
 *
 * The SmallMind Code Project 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
 * General Public License or Apache License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 *
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.web.jersey.aop;

import org.glassfish.jersey.server.ContainerRequest;
import org.smallmind.nutsnbolts.reflection.MissingAnnotationException;

public class EntityTranslator {

  private static final ThreadLocal JSON_ENTITY_LOCAL = new ThreadLocal<>();
  private static final ThreadLocal> JSON_ENTITY_CLASS_LOCAL = new ThreadLocal<>();

  public static  void storeEntityType (Class clazz) {

    JSON_ENTITY_CLASS_LOCAL.set(clazz);
  }

  public static  T getParameter (ContainerRequest containerRequest, String key, Class clazz, ParameterAnnotations parameterAnnotations) {

    JsonEntity jsonEntity;

    if ((jsonEntity = JSON_ENTITY_LOCAL.get()) == null) {

      Class entityClass;

      if ((entityClass = JSON_ENTITY_CLASS_LOCAL.get()) == null) {
        throw new MissingAnnotationException("Missing annotation(%s)", ResourceMethod.class.getName());
      } else if (JsonEntity.class.equals(entityClass)) {
        throw new ParameterProcessingException("The @%s annotation must define an implementation of %s", ResourceMethod.class.getSimpleName(), JsonEntity.class.getSimpleName());
      }

      JSON_ENTITY_LOCAL.set(jsonEntity = containerRequest.readEntity(entityClass));
    }

    try {
      return jsonEntity.getParameter(key, clazz, parameterAnnotations);
    } catch (Throwable throwable) {
      JSON_ENTITY_LOCAL.remove();

      throw throwable;
    }
  }

  public static void clearEntity () {

    JSON_ENTITY_LOCAL.remove();
  }
}