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Scala example source code file (Proxy.scala)

This example Scala source code file (Proxy.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

any, any, boolean, boolean, equals, int, int, proxy, proxy, string, t, typed

The Scala Proxy.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2002-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://www.scala-lang.org/           **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala

/** This class implements a simple proxy that forwards all calls to
 *  the public, non-final methods defined in class "Any" to another
 *  object self.  Those methods are:
 *  
 *    def hashCode(): Int
 *    def equals(other: Any): Boolean
 *    def toString(): String
 *
 *  Note: forwarding methods in this way will most likely create
 *  an asymmetric equals method, which is not generally recommended.
 *
 *  @author  Matthias Zenger
 *  @version 1.0, 26/04/2004
 */
trait Proxy {
  def self: Any
  
  override def hashCode: Int = self.hashCode
  override def equals(that: Any): Boolean = that match {
    case null       => false
    case x: Equals  => (x canEqual self) && (x equals self)
    case x          => (x equals self)
  }
  override def toString: String = self.toString
}

object Proxy {
  /** A proxy which exposes the type it is proxying for via a type parameter.
   */
  trait Typed[T] extends Proxy {
    def self: T
  }
}

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