Adds Builder for SimpleMailMessageItemWriter

resolves BATCH-2594

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/builder/JpaPagingItemReaderBuilder.java

@@ -23,8 +23,13 @@ import org.springframework.batch.item.database.orm.JpaQueryProvider;
 import org.springframework.util.Assert;
 
 /**
+ * Creates a fully qualified JpaPagingItemReader.
+ *
  * @author Michael Minella
+ *
+ * @since 4.0
  */
+
 public class JpaPagingItemReaderBuilder<T> {
 
 	private String name;

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/mail/builder/SimpleMailMessageItemWriterBuilder.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2017 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
+ *
+ *          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 org.springframework.batch.item.mail.builder;
+
+import java.util.List;
+
+import org.springframework.batch.item.mail.DefaultMailErrorHandler;
+import org.springframework.batch.item.mail.MailErrorHandler;
+import org.springframework.batch.item.mail.SimpleMailMessageItemWriter;
+import org.springframework.mail.MailSender;
+import org.springframework.util.Assert;
+
+/**
+ * Creates a fully qualified SimpleMailMessageItemWriter.
+ *
+ * @author Glenn Renfro
+ *
+ * @since 4.0
+ */
+
+public class SimpleMailMessageItemWriterBuilder {
+
+	private MailSender mailSender;
+
+	private MailErrorHandler mailErrorHandler = new DefaultMailErrorHandler();
+
+	/**
+	 * A {@link MailSender} to be used to send messages in
+	 * {@link SimpleMailMessageItemWriter#write(List)}.
+	 *
+	 * @param mailSender strategy for sending simple mails.
+	 * @return this instance for method chaining.
+	 * @see SimpleMailMessageItemWriter#setMailSender(MailSender)
+	 */
+	public SimpleMailMessageItemWriterBuilder mailSender(MailSender mailSender) {
+		this.mailSender = mailSender;
+		return this;
+	}
+
+	/**
+	 * The handler for failed messages. Defaults to a {@link DefaultMailErrorHandler}.
+	 *
+	 * @param mailErrorHandler the mail error handler to set.
+	 * @return this instance for method chaining.
+	 * @see SimpleMailMessageItemWriter#setMailErrorHandler(MailErrorHandler)
+	 */
+	public SimpleMailMessageItemWriterBuilder mailErrorHandler(MailErrorHandler mailErrorHandler) {
+		this.mailErrorHandler = mailErrorHandler;
+		return this;
+	}
+
+	/**
+	 * Returns a fully constructed {@link SimpleMailMessageItemWriter}.
+	 *
+	 * @return a new {@link SimpleMailMessageItemWriter}
+	 */
+	public SimpleMailMessageItemWriter build() {
+		Assert.notNull(this.mailSender, "A mailSender is required");
+
+		SimpleMailMessageItemWriter writer = new SimpleMailMessageItemWriter();
+		writer.setMailSender(this.mailSender);
+		if (mailErrorHandler != null) {
+			writer.setMailErrorHandler(this.mailErrorHandler);
+		}
+
+		return writer;
+	}
+}