private static AttributeKey getAttributeKey(final String schemaArn, final String facetName,
                                                final String attributeName) {
        return AttributeKey.builder()
            .facetName(facetName)
            .schemaArn(schemaArn)
            .name(attributeName)
            .build();
    }
Gets attribute key.

@param schemaArn     the schema arn
@param facetName     the facet name
@param attributeName the attribute name
@return the attribute key
support/cas-server-support-cloud-directory-authentication/src/main/java/org/apereo/cas/clouddirectory/AmazonCloudDirectoryUtils.java