Today I had a small situation where there is a structure in the session scope that, when a form is submitted with address information, put this address data into that session scoped structure. However, there is a checkbox and a submit button on the form that get sent along with the form scope. I did not want to do a straight structAppend and get those values as well.
So I decided to build a function using the power and speed of Groovy to merge two structures together, but only keys that match a regular expression criteria. The use of such a function would look like this.
<cfset session.checkOut = ReMergeStructuresByKey(session.checkOut, form, '(?i)billing[a-z0-9]+|shipping[a-z0-9]+') />In this example I want to merge keys from the form scope into the session.checkOut structure where the key name starts with “billing” or “shipping”. The resulting structure in session.checkOut will have not only its original members, but all the new address information as well.
Here is the function that achieves this. Note that I am using a modified CFGroovy script as described here.
<cffunction name="ReMergeStructuresByKey" returntype="any" access="public" output="true">
<cfargument name="source" type="struct" required="true" />
<cfargument name="toMerge" type="struct" required="true" />
<cfargument name="searchPattern" type="string" required="true" />
<cfargument name="overwrite" type="boolean" required="false" default="true" />
<cfimport prefix="g" taglib="groovyEngine" />
<cfset arguments.result = duplicate(arguments.source) />
<cfset arguments.overwrite = javaCast("boolean", arguments.overwrite) />
<cfoutput>
<g:script args="#arguments#">
import java.util.regex.*
keys = arguments.toMerge.keySet().iterator()
key = ""
index = 0
exists = 0
go = false
Pattern p = Pattern.compile(arguments.searchPattern)
Matcher m = null
while (keys.hasNext()) {
key = keys.next()
if ((m = p.matcher(key)).matches()) {
exists = arguments.source.containsKey(key)
go = ((exists && arguments.overwrite) || !exists)
if (go) arguments.result.put(key, arguments.toMerge.get(key))
}
}
</g:script>
</cfoutput>
<cfreturn arguments.result />
</cffunction>Happy coding.