/*
 * Copyright 2011-2020 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 org.springframework.data.jpa.repository.cdi;

import java.lang.annotation.Annotation;
import java.util.Optional;
import java.util.Set;

import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.persistence.EntityManager;

import org.springframework.data.jpa.repository.support.JpaRepositoryFactory;
import org.springframework.data.repository.cdi.CdiRepositoryBean;
import org.springframework.data.repository.config.CustomRepositoryImplementationDetector;
import org.springframework.util.Assert;

A bean which represents a JPA repository.
Author:
Dirk Mahler, Oliver Gierke, Mark Paluch, Christoph Strobl
Type parameters:
<T> – The type of the repository./**
 * A bean which represents a JPA repository.
 *
 * @author Dirk Mahler
 * @author Oliver Gierke
 * @author Mark Paluch
 * @author Christoph Strobl
 * @param <T> The type of the repository.
 */
class JpaRepositoryBean<T> extends CdiRepositoryBean<T> {

	private final Bean<EntityManager> entityManagerBean;

	
Constructs a JpaRepositoryBean. 
Params:
beanManager – must not be null.
entityManagerBean – must not be null.
qualifiers – must not be null.
repositoryType – must not be null.
detector – can be Optional.empty()./**
	 * Constructs a {@link JpaRepositoryBean}.
	 *
	 * @param beanManager must not be {@literal null}.
	 * @param entityManagerBean must not be {@literal null}.
	 * @param qualifiers must not be {@literal null}.
	 * @param repositoryType must not be {@literal null}.
	 * @param detector can be {@link Optional#empty()}.
	 */
	JpaRepositoryBean(BeanManager beanManager, Bean<EntityManager> entityManagerBean, Set<Annotation> qualifiers,
			Class<T> repositoryType, Optional<CustomRepositoryImplementationDetector> detector) {

		super(qualifiers, repositoryType, beanManager, detector);

		Assert.notNull(entityManagerBean, "EntityManager bean must not be null!");
		this.entityManagerBean = entityManagerBean;
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.repository.cdi.CdiRepositoryBean#create(javax.enterprise.context.spi.CreationalContext, java.lang.Class)
	 */
	@Override
	protected T create(CreationalContext<T> creationalContext, Class<T> repositoryType) {

		EntityManager entityManager = getDependencyInstance(entityManagerBean, EntityManager.class);

		return create(() -> new JpaRepositoryFactory(entityManager), repositoryType);
	}
}