For a project we are about to start working on, there is a need for several
different types of bean collections.
The question I am trying to figure out .. is it okay to create a 'generic'
collection and use it for this? It will require me to use returntype and
parameter type of "any" for anything having to do with the beans it
interacts with. The alternative is to create a custom collection class for
each one. In that case I would probably just create a base class and
override the item() and add() methods of my component .. no reason I
couldn't continue to use the existing count() and remove() methods as they
don't return any objects.
My 'generic' class would look just like this:
<cfcomponent displayname="collection">
<cfset variables.instance = StructNew() />
<cfset variables.instance.items = ArrayNew(1) />
<cffunction name="init" access="public" returntype="collection">
<cfset variables.instance = StructNew() />
<cfset variables.instance.items = ArrayNew(1) />
<cfreturn this />
</cffunction>
<cffunction name="add" access="public" returntype="any">
<cfargument name="item" type="any" required="true">
<cfset ArrayAppend(variables.instance.items, arguments.item)
/>
<cfreturn arguments.item />
</cffunction>
<cffunction name="item" access="public" returntype="any">
<cfargument name="index" type="numeric" required="true">
<cfreturn variables.instance.items[arguments.index] />
</cffunction>
<cffunction name="count" access="public" returntype="numeric">
<cfreturn ArrayLen(variables.instance.items) />
</cffunction>
<cffunction name="snapShot" access="public" returntype="void">
<cfdump var="#variables.instance#" />
</cffunction>
</cfcomponent>
The 'custom' versions would be real similar, just overriding the add and
item functions as I mentioned above. Is there any reason this is a bad
idea, other than the obvious fact that consumers of the component will be
able to pass in all sorts of crap other than objects into the collection (I
would expect them to know better)?
Thanks
Eric
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