CODEWITHSUNDEEP
springdependency-injection
Siddu
Siddu

Reputation: 119

Spring dynamic Qualifier

I have an interface Shape

public interface Shape {
    String draw();
}

And two implementations for the above Shape interface

@Component("triangle")
public class Triangle implements Shape {
    public String draw() {
        return "drawing Triangle";
    }
}

and

@Component("circle")
public class Circle implements Shape {
    public String draw() {
        return "Drawing Circle";
    }
}

In my client code if I have to decide which Shape class to use at run time based on Qualifier 

 @Autowired
    private Shape shape;
@GET
    @Produces(MediaType.TEXT_HTML)
    @Path("/shape")
    public String getShape(@PathParam("type")
    String type) {
        String a = shape.draw();
        return a;
    }

How to do it? I want to pass "type" which I get as a pathparam to decide which Shape object to be injected at run time. Please help me in resolving this issue.

Upvotes: 2

Views: 3442

Answers (1)

Siddu
Siddu

Reputation: 119

I could figure out one way of getting around this by injecting ApplicationContext in the client code.

 @Autowired
 private ApplicationContext appContext;

And looking up for the bean with the help of getBean method:

@GET
@Produces(MediaType.TEXT_HTML)
@Path("/shape/{type}")
public String getShape(@PathParam("type")
String type) {
    Shape shape = appContext.getBean(type, Shape.class);
    return shape.draw();
}

I hope this would help someone :)

Upvotes: 4

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