/*
    * 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.trade;
  
  import static org.springframework.batch.sample.domain.trade.CustomerOperation.*;
  
  import org.springframework.batch.item.ItemProcessor;
  
  /**
   * @author Lucas Ward
   *
   */
  public class CustomerUpdateProcessor implements ItemProcessor<CustomerUpdate, CustomerUpdate>{
  
  	private CustomerDao customerDao;
  	private InvalidCustomerLogger invalidCustomerLogger;
  	
  	public CustomerUpdate process(CustomerUpdate item) throws Exception {
  		
  		if(item.getOperation() == DELETE){
  			//delete is not supported
  			invalidCustomerLogger.log(item);
  			return null;
  		}
  		
  		CustomerCredit customerCredit = customerDao.getCustomerByName(item.getCustomerName());
  		
  		if(item.getOperation() == ADD && customerCredit == null){
  			return item;
  		}
  		else if(item.getOperation() == ADD && customerCredit != null){
  			//veto processing
  			invalidCustomerLogger.log(item);
  			return null;
  		}
  		
  		if(item.getOperation() == UPDATE && customerCredit != null){
  			return item;
  		}
  		else if(item.getOperation() == UPDATE && customerCredit == null){
  			//veto processing
  			invalidCustomerLogger.log(item);
  			return null;
  		}
  		
  		//if an item makes it through all these checks it can be assumed to be bad, logged, and skipped
  		invalidCustomerLogger.log(item);
  		return null;
  	}
  	
  	public void setCustomerDao(CustomerDao customerDao) {
  		this.customerDao = customerDao;
  	}
  	
  	public void setInvalidCustomerLogger(
  			InvalidCustomerLogger invalidCustomerLogger) {
  		this.invalidCustomerLogger = invalidCustomerLogger;
  	}
  
  }