001/*
002 * Copyright 2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *       https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.springframework.batch.item.database.builder;
017
018import javax.persistence.EntityManagerFactory;
019
020import org.springframework.batch.item.database.JpaItemWriter;
021import org.springframework.util.Assert;
022
023/**
024 * A builder for the {@link JpaItemWriter}.
025 *
026 * @author Mahmoud Ben Hassine
027 * @since 4.1
028 * @see JpaItemWriter
029 */
030public class JpaItemWriterBuilder<T> {
031
032        private EntityManagerFactory entityManagerFactory;
033
034        /**
035         * The JPA {@link EntityManagerFactory} to obtain an entity manager from. Required.
036         *
037         * @param entityManagerFactory the {@link EntityManagerFactory}
038         * @return this instance for method chaining
039         * @see JpaItemWriter#setEntityManagerFactory(EntityManagerFactory)
040         */
041        public JpaItemWriterBuilder<T> entityManagerFactory(EntityManagerFactory entityManagerFactory) {
042                this.entityManagerFactory = entityManagerFactory;
043
044                return this;
045        }
046
047        /**
048         * Returns a fully built {@link JpaItemWriter}.
049         *
050         * @return the writer
051         */
052        public JpaItemWriter<T> build() {
053                Assert.state(this.entityManagerFactory != null,
054                                "EntityManagerFactory must be provided");
055
056                JpaItemWriter<T> writer = new JpaItemWriter<>();
057                writer.setEntityManagerFactory(this.entityManagerFactory);
058
059                return writer;
060        }
061}