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Scala example source code file (MapProxy.scala)

This example Scala source code file (MapProxy.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

a, a, b, b, b1, b1, boolean, c, gentraversableonce, map, map, mapproxy, mapproxylike, setproxy

The Scala MapProxy.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */



package scala.collection
package immutable

/** 
 *  This is a simple wrapper class for <a href="Map.html"
 *  target="contentFrame">`scala.collection.immutable.Map`</a>.
 *  
 *  It is most useful for assembling customized map abstractions
 *  dynamically using object composition and forwarding.
 *
 *  @author  Matthias Zenger, Martin Odersky
 *  @version 2.0, 31/12/2006
 *  @since   2.8
 */
trait MapProxy[A, +B] extends Map[A, B] with MapProxyLike[A, B, Map[A, B]] {  
  override def repr = this
  private def newProxy[B1 >: B](newSelf: Map[A, B1]): MapProxy[A, B1] =
    new MapProxy[A, B1] { val self = newSelf }

  override def empty = newProxy(self.empty)
  override def updated [B1 >: B](key: A, value: B1) = newProxy(self.updated(key, value))
    
  override def -(key: A) = newProxy(self - key)
  override def + [B1 >: B](kv: (A, B1)): Map[A, B1] = newProxy(self + kv)
  override def + [B1 >: B](elem1: (A, B1), elem2: (A, B1), elems: (A, B1) *) = newProxy(self.+(elem1, elem2, elems: _*))
  override def ++[B1 >: B](xs: GenTraversableOnce[(A, B1)]) = newProxy(self ++ xs.seq)

  override def keySet: immutable.Set[A] = new SetProxy[A] { val self = MapProxy.this.self.keySet }
  override def filterKeys(p: A => Boolean) = self.filterKeys(p)
  override def mapValues[C](f: B => C) = self.mapValues(f)
}

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