Kerry, Hmmm, an all purpose factory. Do you handle it in some way if the CFC doesn't exist? What about type checking?
I'm wondering if it would be better to call a getter with the load function and if the getter doesn't exist, return an error. I like the single load function tho'. > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of Kerry > Sent: Friday, September 09, 2005 10:08 AM > To: [email protected] > Subject: RE: [CFCDev] Method parameters vs method names WAS: When to use > the THIS scope for a ColdFusion Component? > > > My Answer: > > gatewayFactory.cfc > > function init(dsn,someargs){ > variables.instance.dsn = arguments.dsn; > variables.instance.something = arguments.somethingelse; > } > > function load(gatewayname){ > return > createobject("component",arguments.gatewayname).init(variables.ins > tance.dsn) > ; > } > > > > on application start > > application.gatewayfactory = > createobject("component","gatewayFactory").init(mydsn,myothervariables); > > > > in page: > > objGW = application.gatewayfactory.load("someObjGW"); > objGW.getEmployees(); > > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of Jason Davey > Sent: 09 September 2005 08:58 > To: [email protected] > Subject: RE: [CFCDev] Method parameters vs method names WAS: When to use > the THIS scope for a ColdFusion Component? > > > Barney: > > I like the idea of creating methods with no parameters e.g. > getGasRemaining() thereby abstracting the interface from the caller. This > raises the following question. In the case where you are calling a Gateway > method (SQL SELECT calls), how do you create a clean method e.g. > getEmployees() without passing in a datasource parameter? E.g. > objGateway.getEmployees(APPLICATION.DataSource) > > My answer: the gateway component itself has a property called > "datasource"? > Therefore, would the following be the right approach? > > objGW = CreateObject("component","someObjGW").init(); > objGW.datasource = APPLICATION.DataSource; > objGW.getEmployees(); > > Inside the Gateway component, there is the following: > > The component 'setter / getter' functions... > > <!--- set ---> > <cffunction name="setDataSource" access="private" returntype="void" > output="false"> > > <cfargument name="datasource" type="string" required="true" /> > <cfset variables.datasource = ARGUMENTS.datasource /> > </cffunction> > > <!--- get ---> > <cffunction name="getDataSource" access="private" returntype="string" > output="false"> > <cfreturn variables.datasource /> > </cffunction> > > > And then the getEmployees function... > > <cffunction > name="getEmployees" > access="public" > returntype="query" > displayname="" > hint="returns a list of all employees" > output="false"> > > > > <cfquery name="qryGetEmployees" > datasource="#THIS.datasource#"> > > SELECT * > FROM people where category = 'employee' > > </cfquery> > > > <cfreturn qryGetEmployees /> > </cffunction> > > Jason D > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of Barney Boisvert > Sent: Tuesday, August 30, 2005 4:12 PM > To: [email protected] > Subject: Re: [CFCDev] Method parameters vs method names WAS: When > to use the > THIS scope for a ColdFusion Component? > > Yes, because that changes the interface, which will break existing code. > You could make it an OPTIONAL parameter that defaults to 'gallons', and be > safe, but I don't like the idea of passing in parameters that dictate > behaviour to methods. I much prefer to have a distinct method for each > distinct behaviour, if that makes sense. > > To take a different tact, the standard definition of a getter is a "Zero > argument method that returns the value of an object's property", > not a "one > argument method that returns the value of an object's property, based on > some dynamic calulation that relies on the passed argument". So, you no > longer really have a vanilla getter. Note, however, that neither > definition > precludes you from doing some wholly internal computation to arive at the > returned value; it's the external dependancy (the passed parameter) that > differentiates them. > > Subtle points, but enough to make me take the "add methods" route. > > cheers, > barneyb > > On 8/30/05, John Ottenbacher <[EMAIL PROTECTED]> wrote: > > Greetings, > > > > I am trying to transition from procedural development to OO development. > > > > I'm curious, in the example given is there anything 'wrong' with > > adding a parameter to GetGasLeft()? It would have to be optional and > > default to the original unit of measurement so as not to break existing > code. > > > > getGasLeft("GALLONS") > > getGasLeft("METERS") > > > > Thanks, > > > > John > > > > -- > Barney Boisvert > [EMAIL PROTECTED] > 360.319.6145 > http://www.barneyb.com/ > > Got Gmail? I have 100 invites. > > > ---------------------------------------------------------- > You are subscribed to cfcdev. 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