Dynamic injection in Spring

Question

I have 2 tax implementation classes IndianTaxCalculation and USTAxCalculation which have implementaions for calculateTax() method. I need

Answer 1

You can create a locator service like:

public class ServiceLocator implements ApplicationContextAware
{
  private static ApplicationContext context;
  public void setApplicationContext(ApplicationContext context)
  {
    this.context = context;
  }
  public static  T getServiceBean(Class serviceClass, String beanName)
  {
    return context.getBean(beanName, serviceClass);
  }
}

And your service like:

public void calculateTaxes(Client client) 
{
  if (client.isFromIndia())  
  {
    ServiceLocator.getServiceBean(TaxCalculation.class, "indiaTaxBeanName").calculate(client);
  } 
  else if (client.isFromUS())  
 {
    ServiceLocator.getServiceBean(TaxCalculation.class, "usTaxBeanName").calculate(client);
 }

}