protected boolean isEnabled(AnnotationMetadata metadata) {
        return true;
    }

    /**
    * Return the appropriate {@link AnnotationAttributes} from the
    * {@link AnnotationMetadata}. By default this method will return attributes for
    * {@link #getAnnotationClass()}.
    * @param metadata the annotation metadata
    * @return annotation attributes
    */
    protected AnnotationAttributes getAttributes(AnnotationMetadata metadata) {
        String name = getAnnotationClass().getName();
        AnnotationAttributes attributes = AnnotationAttributes
                .fromMap(metadata.getAnnotationAttributes(name, true));
        Assert.notNull(attributes,
                "No auto-configuration attributes found. Is " + metadata.getClassName()
                        + " annotated with " + ClassUtils.getShortName(name) + "?");
        return attributes;
    }

    /**
    * Return the source annotation class used by the selector.
    * @return the annotation class
    */
    protected Class<?> getAnnotationClass() {
        return EnableAutoConfiguration.class;
    }

    /**
    * Return the auto-configuration class names that should be considered. By default
    * this method will load candidates using {@link SpringFactoriesLoader} with
    * {@link #getSpringFactoriesLoaderFactoryClass()}.
    * @param metadata the source metadata
    * @param attributes the {@link #getAttributes(AnnotationMetadata) annotation
    * attributes}
    * @return a list of candidate configurations
    */
    protected List<String> getCandidateConfigurations(AnnotationMetadata metadata,
            AnnotationAttributes attributes) {
        List<String> configurations = SpringFactoriesLoader.loadFactoryNames(
                getSpringFactoriesLoaderFactoryClass(), getBeanClassLoader());
        Assert.notEmpty(configurations,
                "No auto configuration classes found in META-INF/spring.factories. If you "
                        + "are using a custom packaging, make sure that file is correct.");
        return configurations;
    }