The bridge design pattern is another example of those that can be achieved with the powerful features of the Scala programming language. Here, we will be using self types. The initial Hasher trait remains unchanged. Then, the actual implementations become traits instead of classes as follows:
trait Sha1Hasher extends Hasher { override def hash(data: String): String = new String(Hex.encodeHex(getDigest("SHA-1", data).digest()))}trait Sha256Hasher extends Hasher { override def hash(data: String): String = new String(Hex.encodeHex(getDigest("SHA-256", data).digest()))}trait Md5Hasher extends Hasher { override def hash(data: String): String = new String(Hex.encodeHex(getDigest("MD5", data).digest())) ...
