Can I use @ConditionalOnExpression to check for an annotation's property value?

Question

I want to have an annotation where it will pull in a different config class based on the value of property. It might work something like this:

(All of this is pseudo code)

The annotation:

import org.springframework.context.annotation.Import;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Import(RedisConfig.class)
@Import(HazelCastConfig.class)
public @interface EnableCaching
{
    Class cacheType() default Redis.class;
}

An example of one of the configs:

import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
import org.springframework.cache.annotation.EnableCaching;

import java.util.List;

@EnableCaching
@ConditionalOnExpression("#{T(com.mypackage.CacheAnnotationMatcher).checkCacheType(com.mypackage.Redis.class)}")
public class RedisConfig
{
    //...elided...
}

Where CacheAnnotationMatcher.checkProperty is a class and method I create that finds the @EnableCaching annotation and checks the cacheType property and returns true/false.

Answer 1

I think you could use @ConditionalOnExpression here, I see absolutely no reason why your code wouldn't work, have your tried it?