mapproxy.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 38 行

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2006, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |                                         **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

// $Id: MapProxy.scala 10086 2007-02-21 19:10:41Z odersky $


package scala.collection


/** This is a simple wrapper class for <a href="Map.html"
 *  target="contentFrame"><code>scala.collection.Map</code></a>.
 *  It is most useful for assembling customized map abstractions
 *  dynamically using object composition and forwarding.
 *
 *  @author  Matthias Zenger
 *  @version 1.0, 21/07/2003
 */
trait MapProxy[A, +B] extends Map[A, B] with IterableProxy[(A, B)] {

  def self: Map[A, B]

  override def size: Int = self.size
  override def get(key: A): Option[B] = self.get(key)
  override def isEmpty: Boolean = self.isEmpty
  override def apply(key: A): B = self.apply(key)
  override def contains(key: A): Boolean = self.contains(key)
  override def isDefinedAt(key: A) = self.isDefinedAt(key)
  override def keys: Iterator[A] = self.keys
  override def keySet: Set[A] = self.keySet
  override def values: Iterator[B] = self.values
  override def default(key: A): B = self.default(key)
}