A simple ColdFusion scope facade

ScopeFacade.cfc

<!---
Scope Facade
Author: Sean Coyne (http://n42designs.com)
Copyright 2011 and Beyond.  All Rights Reserved.
--->
<cfcomponent output="false">
	
	<cfset variables.instance = {} />
	<cfset variables.instance.scopename = '' />
	<cfset variables.instance.scope = '' />
	
	<cffunction name="init" returntype="scopeFacade" output="false" access="public">
		<cfargument name="scope" required="true" type="variablename" />
		<cfset variables.instance.scopename = arguments.scope />
		<cfreturn this />
	</cffunction>
	
	<cffunction name="getscope" returntype="struct" output="false" access="private">
		<cfreturn structGet(variables.instance.scopename) />
	</cffunction>
	
	<cffunction name="get" returntype="any" output="false" access="public">
		<cfargument name="key" required="true" type="string" />
		<cfargument name="default" required="false" type="string" />
		<cfset var scope = getscope() />
		<cfif structKeyExists(arguments,"default") and not structKeyExists(scope,arguments.key)>
			<cfreturn arguments.default />
		</cfif>
		<cfreturn scope[arguments.key] />
	</cffunction>
	
	<cffunction name="set" returntype="void" output="false" access="public">
		<cfargument name="key" required="true" type="string" />
		<cfargument name="value" required="true" type="any" />
		<cfset var scope = getscope() />
		<cfset scope[arguments.key] = arguments.value />
	</cffunction>
	
	<cffunction name="delete" returntype="void" output="false" access="public">
		<cfargument name="key" required="true" type="string" />
		<cfset var scope = getscope() />
		<cfif exists(arguments.key)>
			<cfset structDelete(scope,arguments.key) />
		</cfif>
	</cffunction>
	
	<cffunction name="exists" returntype="boolean" output="false" access="public">
		<cfargument name="key" required="true" type="string" />
		<cfreturn structKeyExists(getScope(),arguments.key) />
	</cffunction>
	
</cfcomponent>