Use shorter class-level File methods instead of going through File.stat.

actionpack/lib/action_view/template/resolver.rb

@@ -161,7 +161,7 @@ def build_query(path, details)
 
     # Returns the file mtime from the filesystem.
     def mtime(p)
-      File.stat(p).mtime
+      File.mtime(p)
     end
 
     # Extract handler and formats from path. If a format cannot be a found neither

actionpack/test/template/asset_tag_helper_test.rb

@@ -481,7 +481,7 @@ def test_audio_tag
   end
 
   def test_timebased_asset_id
-    expected_time = File.stat(File.expand_path(File.dirname(__FILE__) + "/../fixtures/public/images/rails.png")).mtime.to_i.to_s
+    expected_time = File.mtime(File.expand_path(File.dirname(__FILE__) + "/../fixtures/public/images/rails.png")).to_i.to_s
     assert_equal %(<img alt="Rails" src="/images/rails.png?#{expected_time}" />), image_tag("rails.png")
   end
 
@@ -512,7 +512,7 @@ def test_image_tag_interpreting_email_adding_optional_alt_tag
 
   def test_timebased_asset_id_with_relative_url_root
     @controller.config.relative_url_root = "/collaboration/hieraki"
-    expected_time = File.stat(File.expand_path(File.dirname(__FILE__) + "/../fixtures/public/images/rails.png")).mtime.to_i.to_s
+    expected_time = File.mtime(File.expand_path(File.dirname(__FILE__) + "/../fixtures/public/images/rails.png")).to_i.to_s
     assert_equal %(<img alt="Rails" src="#{@controller.config.relative_url_root}/images/rails.png?#{expected_time}" />), image_tag("rails.png")
   end
 

activesupport/lib/active_support/file_update_checker.rb

@@ -22,7 +22,7 @@ def initialize(paths, calculate=false, &block)
     end
 
     def updated_at
-      paths.map { |path| File.stat(path).mtime }.max
+      paths.map { |path| File.mtime(path) }.max
     end
 
     def execute_if_updated

railties/lib/rails/code_statistics.rb

@@ -30,7 +30,7 @@ def calculate_directory_statistics(directory, pattern = /.*\.rb$/)
       stats = { "lines" => 0, "codelines" => 0, "classes" => 0, "methods" => 0 }
 
       Dir.foreach(directory) do |file_name|
-        if File.stat(directory + "/" + file_name).directory? and (/^\./ !~ file_name)
+        if File.directory?(directory + "/" + file_name) and (/^\./ !~ file_name)
           newstats = calculate_directory_statistics(directory + "/" + file_name, pattern)
           stats.each { |k, v| stats[k] += newstats[k] }
         end