SpringBeanByEnum

SpringBeanByEnum.java

public enum Plan {
 FREE, EXPRESS, PROFESSIONAL, ENTERPRISE 
}

public class Customer {
 long id;
 String name;
 Plan plan;
}

public interface PdfGenerator {

  byte[] generatePdf();
  
  Plan forPlan();
  
}

@Service
class FreePdfGenerator implements PdfGenerator {
  byte[] generatePdf() {
     return []; 
  };
  
  Plan forPlan() {
     return Plan.FREE; 
  }
}

...
  
@Service
class EnterprisePdfGenerator implements PdfGenerator {
  byte[] generatePdf() {
     return []; 
  };
  
  Plan forPlan() {
     return Plan.ENTERPRISE; 
  }
}

@Service
class InvoiceService {

  List<PdfGenerator> pdfGenerators; //Spring injects here all 4 PDF Generators
  
  public createInvoice() {
     Customer customer = getCurrentCustomer();
     PdfGenerator pdfGenerator = getPdfGeneratorForPlan(customer.getPlan()); //here i chose the one generator from the List
     var pdf = pdfGenerator.generatePdf();
  }
  
}