Added builder for GemfireItemWriter

resolves BATCH-2614

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/data/builder/GemfireItemWriterBuilder.java

@@ -0,0 +1,95 @@
+/*
+ * 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.data.builder;
+
+import org.springframework.batch.item.data.GemfireItemWriter;
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.data.gemfire.GemfireTemplate;
+import org.springframework.util.Assert;
+
+/**
+ * A builder implementation for the {@link GemfireItemWriter}
+ *
+ * @author Glenn Renfro
+ * @since 4.0
+ * @see GemfireItemWriterBuilder
+ */
+public class GemfireItemWriterBuilder<K, V> {
+
+	private GemfireTemplate template;
+
+	private Converter<V, K> itemKeyMapper;
+
+	private boolean delete;
+
+	/**
+	 * Establishes the GemfireTemplate the writer should use.
+	 * @param template the {@link GemfireTemplate} to set.
+	 * @return The current instance of the builder.
+	 * @see GemfireItemWriter#setTemplate(GemfireTemplate)
+	 */
+	public GemfireItemWriterBuilder<K, V> template(GemfireTemplate template) {
+		this.template = template;
+
+		return this;
+	}
+
+	/**
+	 * Set the {@link Converter} to use to derive the key from the item.
+	 *
+	 * @param itemKeyMapper the Converter to use.
+	 * @return The current instance of the builder.
+	 * @see GemfireItemWriter#setItemKeyMapper(Converter)
+	 */
+	public GemfireItemWriterBuilder<K, V> itemKeyMapper(Converter<V, K> itemKeyMapper) {
+		this.itemKeyMapper = itemKeyMapper;
+
+		return this;
+	}
+
+	/**
+	 * Indicates if the items being passed to the writer are to be saved or removed from
+	 * the data store. If set to false (default), the items will be saved. If set to true,
+	 * the items will be removed.
+	 *
+	 * @param delete removal indicator.
+	 * @return The current instance of the builder.
+	 * @see GemfireItemWriter#setDelete(boolean)
+	 */
+	public GemfireItemWriterBuilder<K, V> delete(boolean delete) {
+		this.delete = delete;
+
+		return this;
+	}
+
+
+	/**
+	 * Validates and builds a {@link GemfireItemWriter}.
+	 *
+	 * @return a {@link GemfireItemWriter}
+	 */
+	public GemfireItemWriter<K, V> build() {
+		Assert.notNull(this.template, "template is required.");
+		Assert.notNull(this.itemKeyMapper, "itemKeyMapper is required.");
+
+		GemfireItemWriter<K, V> writer = new GemfireItemWriter<>();
+		writer.setTemplate(this.template);
+		writer.setItemKeyMapper(this.itemKeyMapper);
+		writer.setDelete(this.delete);
+		return writer;
+	}
+}