--- /dev/null
+# Test whether a given class or definition is defined
+require 'puppet/parser/functions'
+
+Puppet::Parser::Functions.newfunction(:concat_getparam,
+ :type => :rvalue,
+ :doc => <<-'ENDOFDOC'
+Takes a resource reference and name of the parameter and
+returns value of resource's parameter.
+
+*Examples:*
+
+ define example_resource($param) {
+ }
+
+ example_resource { "example_resource_instance":
+ param => "param_value"
+ }
+
+ concat_getparam(Example_resource["example_resource_instance"], "param")
+
+Would return: param_value
+ENDOFDOC
+) do |vals|
+ reference, param = vals
+ raise(ArgumentError, 'Must specify a reference') unless reference
+ raise(ArgumentError, 'Must specify name of a parameter') unless param and param.instance_of? String
+
+ return '' if param.empty?
+
+ if resource = findresource(reference.to_s)
+ return resource[param] if resource[param]
+ end
+
+ return ''
+end