DomainName

A DomainName represents a name in the domain name system.

Unlike the example in Programming in Scala/2e the elements of the domain name are stored in the same order as used, i.e. as www.scalacraft.com, not reversed.

This implementation is case sensitive which is at variance with the Wikipedia specification. If a convincing use case for case insensitivity arises this could be reconsidered. Expressed in code we have,

DomainName.opt("WWW") != DomainName.opt("www")

The v2 documentation provides details of the syntactic constraints placed on domain names.

Pattern Matching

Pattern matching is supported as the following example demonstrates,

"example.com" match {
case DomainName(label1, label2) => label1 :: label2 :: Nil  // List("example", "com")
case _ => None
}

Invalid domain names will not be matched.

"a.b-" match {
case DomainName(label1, label2) => label1 :: label2 :: Nil
case _ => None  // None
}

To match an arbitrary number of domain name labels use a pattern sequence,

"www.example.com" match {
case DomainName(label, labels@_*) => labels  // "example"::"com"::Nil
}

Implicit Conversions

Implicit conversions exist which allow an instance of DomainName to be used when either a String or Seq[String] is required.

def countElements(seq: Seq[String]) = seq.length

val dn = DomainName.opt("www", "example", "com").get
val elemNo = countElements(dn) // 3

A conversion to the unconstrained version of this class is also available.

Linear Supertypes

Serializable, Serializable, Product, Equals, AnyRef, Any

Value Members

final def !=(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def ##(): Int

Definition Classes
AnyRef → Any
final def ==(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def asInstanceOf[T0]: T0

Definition Classes
Any
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
val labels: String*
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )

Related Docs: object DomainName | package net

case class DomainName extends Product with Serializable

Pattern Matching

Implicit Conversions

Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def finalize(): Unit

final def getClass(): Class[_]

final def isInstanceOf[T0]: Boolean

val labels: String*

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from Serializable

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

Ungrouped