getParentTemplatePath() function for Railo

Posted by Paul Klinkenberg in Railo on February 1, 2011

Railo has the cool ability to use relative file paths in all it's main directory and file functions. For example <cfset fileRead("myFile.txt") />.

Now, I am writing a new custom tag CFCSV for Railo, and also wanted to include this ability: <cfcsv action="parse" file="myFile.csv" />. Therefor, my custom tag needed to know the caller's template path, and calculate the full file path from there. Finding the caller's template path took me longer then expected. I thought I could easily get it from the reference to the "caller" within my custom tag. I didn't find it in that object unfortunately. So in the end, I chose to just get the current stack trace for the request, and loop through there:

<cffunction name="getParentTemplatePath" returntype="string" output="no">
    <cfset var stackTraceArr = getPageContext().getThread().getStackTrace() />
    <cfset var i = -1 />
    <cfset var thisFncFound = false />
    <cfset var currentFilePath = "" />
    <cfloop collection="#stackTraceArr#" item="i">
        <cfif right(stackTraceArr[i].getClassName(), 3) == "$cf">
            <cfif not thisFncFound>
                <cfset thisFncFound = true />
            <cfelseif len(currentFilePath) and stackTraceArr[i].getFileName() neq currentFilePath>
                <cfreturn stackTraceArr[i].getFileName() />
            <cfelse>
                <cfset currentFilePath = stackTraceArr[i].getFileName() />
            </cfif>
        </cfif>
    </cfloop>
    <cfreturn "" />
</cffunction>