需要帮助创建 Java 注释

Question

I have a requirement where I have to modify the annotation

@Qualifier(CONSTANT + "ABC")
DataSource dataSource;

to

@DataSourceQualifier("ABC")
DataSource dataSource;

Here is my Annotation code:

@Retention(RetentionPolicy.RUNTIME)
@Target(value = {ElementType.FIELD})
public @interface DataSourceQualifier {
    String value();
}

Is it even possible to do this? I have previously used annotation with AOP but I do not understand how to create this decorator annotation.

Answer 1

If there was no value involved, then it would be possible assuming Qualifier annotation is annotated with @Inherited , then you could annotate your DataSourceQualifier with the @Qualifier , then all the places that you annotate with @DataSourceQualifier for the purpose of annotation processing would act as if they had the @Qualifier annotation.

However, if you want to do any passing of a your annotation's value into the metaannotation value, that's not possible.