in hadoop-api-shim/src/main/java/org/apache/hadoop/fs/shim/impl/ShimReflectionSupport.java [259:268]
public static <T> String availability(final IsImplemented source, String... features) {
StringBuilder result = new StringBuilder();
for (String feature : features) {
result.append(feature)
.append("=")
.append(source.isImplemented(feature))
.append("\n");
}
return result.toString();
}