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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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 Lesser General Public License for more
 * details.
 */

package com.liferay.portal.spring.hibernate;

import com.liferay.petra.lang.CentralizedThreadLocal;
import com.liferay.petra.reflect.ReflectionUtil;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

import java.util.HashMap;
import java.util.Map;

import org.springframework.core.NamedThreadLocal;
import org.springframework.transaction.support.ResourceHolder;
import org.springframework.transaction.support.TransactionSynchronizationManager;

/**
 * @author Shuyang Zhou
 */
public class SpringHibernateThreadLocalUtil {

	public static  T getResource(Object key) {
		Map resources = _resourcesThreadLocal.get();

		if (resources == null) {
			return null;
		}

		Object resource = resources.get(key);

		if (resource instanceof ResourceHolder) {
			ResourceHolder resourceHolder = (ResourceHolder)resource;

			if (resourceHolder.isVoid()) {
				resources.remove(key);

				if (resources.isEmpty()) {
					_resourcesThreadLocal.remove();
				}

				return null;
			}
		}

		return (T)resource;
	}

	public static  T setResource(Object key, Object resource) {
		Map resources = _resourcesThreadLocal.get();

		Object oldResource = null;

		if (resource == null) {
			if (resources == null) {
				return null;
			}

			oldResource = resources.remove(key);

			if (resources.isEmpty()) {
				_resourcesThreadLocal.remove();
			}
		}
		else {
			if (resources == null) {
				resources = new HashMap<>();

				_resourcesThreadLocal.set(resources);
			}

			oldResource = resources.put(key, resource);
		}

		if (oldResource instanceof ResourceHolder) {
			ResourceHolder resourceHolder = (ResourceHolder)oldResource;

			if (resourceHolder.isVoid()) {
				oldResource = null;
			}
		}

		return (T)oldResource;
	}

	private static final ThreadLocal> _resourcesThreadLocal;

	static {
		try {
			Field nameField = ReflectionUtil.getDeclaredField(
				NamedThreadLocal.class, "name");

			ThreadLocal resourcesThreadLocal = null;

			for (Field field :
					ReflectionUtil.getDeclaredFields(
						TransactionSynchronizationManager.class)) {

				if (Modifier.isStatic(field.getModifiers()) &&
					ThreadLocal.class.isAssignableFrom(field.getType())) {

					ThreadLocal