lib/nanoc3/base/source_data/layout.rb in nanoc3-3.2.0a3 vs lib/nanoc3/base/source_data/layout.rb in nanoc3-3.2.0a4

@@ -4,10 +4,12 @@
 
   # Represents a layout in a nanoc site. It has content, attributes, an
   # identifier and a modification time (to speed up compilation).
   class Layout
 
+    extend Nanoc3::Memoization
+
     # @return [String] The raw content of this layout
     attr_reader :raw_content
 
     # @return [Hash] This layout's attributes
     attr_reader :attributes
@@ -32,11 +34,11 @@
     #   last modified. Deprecated; pass the modification time as the `:mtime`
     #   attribute instead.
     def initialize(raw_content, attributes, identifier, params=nil)
       @raw_content  = raw_content
       @attributes   = attributes.symbolize_keys
-      @identifier   = identifier.cleaned_identifier
+      @identifier   = identifier.cleaned_identifier.freeze
 
       # Set mtime
       params ||= {}
       params = { :mtime => params } if params.is_a?(Time)
       @attributes.merge(:mtime => params[:mtime]) if params[:mtime]
@@ -59,10 +61,19 @@
     # @return [Symbol] :layout
     def type
       :layout
     end
 
+    # Prevents all further modifications to the layout.
+    #
+    # @return [void]
+    def freeze
+      attributes.freeze_recursively
+      identifier.freeze
+      raw_content.freeze
+    end
+
     # Returns an object that can be used for uniquely identifying objects.
     #
     # @api private
     #
     # @return [Object] An unique reference to this object
@@ -71,9 +82,17 @@
     end
 
     def inspect
       "<#{self.class}:0x#{self.object_id.to_s(16)} identifier=#{self.identifier}>"
     end
+
+    # TODO document
+    def checksum
+      attributes = @attributes.dup
+      attributes.delete(:file)
+      @raw_content.checksum + ',' + attributes.checksum
+    end
+    memoize :checksum
 
     # @deprecated Access the modification time using `layout[:mtime]` instead.
     def mtime
       self[:mtime]
     end