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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id: Set.scala 16893 2009-01-13 13:09:22Z cunei $
package scalax.collection.immutable
import generic._
object Map extends MapFactory[Map] {
private val hashSeed = "Map".hashCode
def empty[A, B]: Map[A, B] = new EmptyMap[A, B]
}
trait Map[A, B] extends MapTemplate[A, B, Map] with collection.Map[A, B] { self =>
def empty[B]: Map[A, B] = new EmptyMap[A, B]
/** The same map with a given default function */
def withDefault(d: A => B): Map[A, B] = new Map[A, B] {
def size = self.size
def get(key: A) = self.get(key)
def elements = self.elements
override def empty[C] = self.empty
def update (key: A, value: B): Map[A, B] =
self update (key, value) withDefault d
def - (key: A): Map[A, B] =
self - key withDefault d
override def default(key: A): B = d(key)
}
/** The same map with a given default value */
def withDefaultValue(d: B): Map[A, B] = withDefault(x => d)
/** Compares this set with another object and returns true, iff the
* other object is also a set which contains the same elements as
* this set.
*
* @param that the other object
* @note not necessarily run-time type safe.
* @return <code>true</code> iff this set and the other set
* contain the same elements.
*/
override def equals(that: Any): Boolean = that match {
case other: Map[a, b] =>
this.size == other.size && this.forall {
case (key, value) => other.get(key.asInstanceOf[a]) match {
case None => false
case Some(otherval) => value == otherval
}
}
case _ => false
}
/** A hash method compatible with <code>equals</code>
*/
override def hashCode() =
(Map.hashSeed /: this) (_ * 41 + _.hashCode)
}
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