Adding a performance optimization to the FileCollection.

I saw about a 7x speed increase when adding this simple
hash to speed up the file index lookup.

Signed-off-by: Luke Kanies <luke@madstop.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/lib/puppet/file_collection.rb b/lib/puppet/file_collection.rb
index 69f59ffdf..7db2600c0 100644
--- a/lib/puppet/file_collection.rb
+++ b/lib/puppet/file_collection.rb
@@ -9,14 +9,16 @@ class Puppet::FileCollection
 
     def initialize
         @paths = []
+        @inverse = {}
     end
 
     def index(path)
-        if @paths.include?(path)
-            return @paths.index(path)
+        if i = @inverse[path]
+            return i
         else
             @paths << path
-            return @paths.length - 1
+            i = @inverse[path] = @paths.length - 1
+            return i
         end
     end