Spring DI (Beans) with multiple concretes…picking one of them

Question

I have a similar question here

Guice with multiple concretes......picking one of them

with a solution for Guice.

But I have a different project usin

Answer 1

I think I have something that works:

beans.xml (note the "util" extras in the namespace declares)

and java

 package com.me.shipping;


import java.util.Collection;
import java.util.Map;
import java.util.Set;

import org.apache.commons.logging.Log;

import com.me.shipping.interfaces.OrderProcessorInterface;
import com.me.shipping.interfaces.ShipperInterface;
import com.me.Models.Order;


public class OrderProcessorImpl implements OrderProcessorInterface {

  private Log logger;
  private java.util.Map shipperInterfaceMap;


  public OrderProcessorImpl(Log lgr, java.util.Map siMap) {

    if (null == lgr) {
      throw new IllegalArgumentException("Log is null");
    }

    if (null == siMap) {
      throw new IllegalArgumentException("Map is null");
    }

    this.logger = lgr;
    this.shipperInterfaceMap = siMap;
  }

  public void ProcessOrder(String preferredShipperAbbreviation, Order ord) {
    this.logger.info(String.format("About to ship. (%1s)", preferredShipperAbbreviation));

    ShipperInterface foundShipperInterface = this.FindShipperInterface(preferredShipperAbbreviation);
    foundShipperInterface.ShipOrder(ord);
  }

    private ShipperInterface FindShipperInterface(String friendlyName)
    {
        ShipperInterface returnItem = null;
        if (null != this.shipperInterfaceMap)
        {
            returnItem = this.shipperInterfaceMap.entrySet().stream()
                    .filter(e -> e.getKey().equalsIgnoreCase(friendlyName))
                      .map(Map.Entry::getValue)
                      .findFirst()
                      .orElse(null);
        }

        if (null == returnItem)
        {
            throw new NullPointerException(String.format("shipperProviderMap did not contain expected item. (Key='%s')", friendlyName));
        }

        return returnItem;
    }
}

and "main" method

        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        BeanFactory factory = context;

        Order ord = new Order();
        OrderProcessorInterface opi = context.getBean(OrderProcessorImpl.class);
        opi.ProcessOrder("fedexFriendlyName", ord);