rotational_array.rb in bluepill-0.0.47

- old
+ new
@@ -1,72 +1,20 @@
+# -*- encoding: utf-8 -*-
 module Bluepill
   module Util
-   class RotationalArray < Array
-     def initialize(size)
-       super(size)
-       
-       @capacity = size
-       @counter = 0
-     end
-     
-     def push(value)
-       idx = rotational_idx(@counter)
-       self[idx] = value
-       
-       @counter += 1
-       self
-     end
-     
-     alias_method :<<, :push
-     
-     def pop
-       raise "Cannot call pop on a rotational array"
-     end
+    class RotationalArray < Array
+      def initialize(size)
+        @capacity = size
 
-     def shift
-       raise "Cannot call shift on a rotational array"
-     end
+        super() # no size - intentionally
+      end
 
-     def unshift
-       raise "Cannot call unshift on a rotational array"
-     end
-     
-     def last
-       return if @counter.zero?
-       
-       self[rotational_idx(@counter - 1)]
-     end
-     
-     def first
-       return if @counter.zero?
-       return self[0] if @counter <= @capacity
-       
-      self[rotational_idx(@counter)]
-     end
-     
-     def clear
-      @counter = 0
-      super
-     end
-     
-     def each(&block)
-       times = @counter >= @capacity ? @capacity : @counter
-       start = @counter >= @capacity ? rotational_idx(@counter) : 0
-       times.times do |i|
-         block.call(self[rotational_idx(start + i)])
-       end
-     end
+      def push(value)
+        super(value)
 
-     unless method_defined?(:nitems)
-       def nitems
-         compact.length
-       end
-     end
-     
-     private
-     
-     def rotational_idx(idx)
-       idx % @capacity
-     end
-   end
- end
+        self.shift if self.length > @capacity
+        self
+      end
+      alias_method :<<, :push
+    end
+  end
 end