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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.collection
package immutable
import generic._
import mutable.Builder
import annotation.unchecked.uncheckedVariance
/** A map whose keys are sorted.
*
* @author Sean McDirmid
* @author Martin Odersky
* @version 2.8
* @since 2.4
*/
trait SortedMap[A, +B] extends Map[A, B]
with scala.collection.SortedMap[A, B]
with MapLike[A, B, SortedMap[A, B]]
with SortedMapLike[A, B, SortedMap[A, B]] {
override protected[this] def newBuilder : Builder[(A, B), SortedMap[A, B]] =
SortedMap.newBuilder[A, B]
override def updated [B1 >: B](key: A, value: B1): SortedMap[A, B1] = this + ((key, value))
/** Add a key/value pair to this map.
* @param key the key
* @param value the value
* @return A new map with the new binding added to this map
* @note needs to be overridden in subclasses
*/
def + [B1 >: B](kv: (A, B1)): SortedMap[A, B1] = throw new AbstractMethodError("SortedMap.+")
/** Adds two or more elements to this collection and returns
* a new collection.
*
* @param elem1 the first element to add.
* @param elem2 the second element to add.
* @param elems the remaining elements to add.
*/
override def + [B1 >: B] (elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *): SortedMap[A, B1] =
this + elem1 + elem2 ++ elems
/** Adds a number of elements provided by a traversable object
* and returns a new collection with the added elements.
*
* @param elems the traversable object.
*/
override def ++[B1 >: B](elems: scala.collection.Traversable[(A, B1)]): SortedMap[A, B1] =
((repr: SortedMap[A, B1]) /: elems) (_ + _)
/** Adds a number of elements provided by an iterator
* and returns a new collection with the added elements.
*
* @param iter the iterator
*/
override def ++[B1 >: B] (iter: Iterator[(A, B1)]): SortedMap[A, B1] =
((repr: SortedMap[A, B1]) /: iter) (_ + _)
}
/**
* @since 2.4
*/
object SortedMap extends ImmutableSortedMapFactory[SortedMap] {
implicit def builderFactory[A, B](implicit ord: Ordering[A]): BuilderFactory[(A, B), SortedMap[A, B], Coll] = new SortedMapBuilderFactory[A, B]
def empty[A, B](implicit ord: Ordering[A]): SortedMap[A, B] = TreeMap.empty[A, B]
}
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