basic.rb in picky-3.3.0

- old
+ new

@@ -19,41 +19,44 @@
                     :mapping_file # The index file's mapping file (loaded into memory for quick access).
 
         # An index cache takes a path, without file extension,
         # which will be provided by the subclasses.
         #
-        def initialize cache_path
+        def initialize cache_path, options = {}
           @cache_path = "#{cache_path}.file.#{extension}"
 
           # This is the mapping file with the in-memory hash for the
           # file position/offset mappings.
           #
           @mapping_file = Memory::JSON.new "#{cache_path}.file_mapping.#{extension}"
+
+          @empty   = options[:empty]
+          @initial = options[:initial]
         end
 
         # The default extension for index files is "index".
         #
         def extension
           :index
         end
 
+        # The empty index that is used for putting the index
+        # together before it is saved into the files.
+        #
+        def empty
+          @empty && @empty.clone || {}
+        end
+
         # The initial content before loading.
         #
         # Note: We could also load the mapping file
         #       as in #load.
         #
         def initial
-          nil
+          @initial && @initial.clone || nil
         end
 
-        # The empty index that is used for putting the index
-        # together before it is saved into the files.
-        #
-        def empty
-          {}
-        end
-
         # Will copy the index file to a location that
         # is in a directory named "backup" right under
         # the directory the index file is in.
         #
         def backup
@@ -92,9 +95,15 @@
         #
         # A small cache is still ok.
         #
         def cache_ok?
           size_of(cache_path) > 0
+        end
+
+        #
+        #
+        def to_s
+          "#{self.class}(#{cache_path},#{mapping_file.cache_path})"
         end
 
       end
 
     end
\ No newline at end of file