/*
    * 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
    *
    *      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.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;
  
  	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
  	 */
  	public void setAggregators(Map<String, LineAggregator<Object>> aggregators) {
  		this.aggregators = aggregators;
  	}
  
  }