인프런 커뮤니티 질문&답변

^{강사님께서 말씀주신 component 중복 호출 부분 추상클래스로 빼봤습니다.  피드백 사항 있으면 말씀 부탁 드립니다^^;}

Decorator - 추상클래스 

public abstract class Decorator implements Component{

    private Component component;

    public Decorator(Component component) {
        this.component = component;
    }

    @Override
    public String operation() {
        return component.operation();
    }
}

MessageDecorator

public class MessageDecorator extends Decorator{

    public MessageDecorator(Component component) {
        super(component);
    }

    @Override
    public String operation() {
        log.info("MessageDecorator 실행");

        //data -> *****data*****
        String result = super.operation();
        String decoResult = "*****" + result + "*****";
        log.info("MessageDecorator 꾸미기 적용 전={}, 적용 후={}", result, decoResult);
        return decoResult;
    }
}

TimeDecoratior

public class MessageDecorator extends Decorator{

    public MessageDecorator(Component component) {
        super(component);
    }

    @Override
    public String operation() {
        log.info("MessageDecorator 실행");

        //data -> *****data*****
        String result = super.operation();
        String decoResult = "*****" + result + "*****";
        log.info("MessageDecorator 꾸미기 적용 전={}, 적용 후={}", result, decoResult);
        return decoResult;
    }
}

test 코드 

@Test
void decorator3() {
    Decorator messageDecorator = new MessageDecorator(new RealComponent());
    messageDecorator.operation();
    System.out.println();

    Decorator timeMsgDecorator = new TimeDecorator(new MessageDecorator(new RealComponent()));
    timeMsgDecorator.operation();
}