spring-batch OrderLineAggregator 源码
spring-batch OrderLineAggregator 代码
文件路径：/spring-batch-samples/src/main/java/org/springframework/batch/sample/domain/order/internal/OrderLineAggregator.java
/*
* Copyright 2006-2007 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.batch.sample.domain.order.internal;
import java.util.Map;
import org.springframework.batch.item.file.transform.LineAggregator;
import org.springframework.batch.sample.domain.order.LineItem;
import org.springframework.batch.sample.domain.order.Order;
/**
* Converts <code>Order</code> object to a list of strings.
*
* @author Dave Syer
* @author Dan Garrette
*/
public class OrderLineAggregator implements LineAggregator<Order> {
private static final String LINE_SEPARATOR = System.getProperty("line.separator");
private Map<String, LineAggregator<Object>> aggregators;
@Override
public String aggregate(Order order) {
StringBuilder result = new StringBuilder();
result.append(aggregators.get("header").aggregate(order) + LINE_SEPARATOR);
result.append(aggregators.get("customer").aggregate(order) + LINE_SEPARATOR);
result.append(aggregators.get("address").aggregate(order) + LINE_SEPARATOR);
result.append(aggregators.get("billing").aggregate(order) + LINE_SEPARATOR);
for (LineItem lineItem : order.getLineItems()) {
result.append(aggregators.get("item").aggregate(lineItem) + LINE_SEPARATOR);
}
result.append(aggregators.get("footer").aggregate(order));
return result.toString();
}
/**
* Set aggregators for all types of lines in the output file
* @param aggregators Map of LineAggregators used to map the various record types for
* each order
*/
public void setAggregators(Map<String, LineAggregator<Object>> aggregators) {
this.aggregators = aggregators;
}
}
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