initial code

.gitignore

@@ -2,3 +2,4 @@
 /.yardoc
 /coverage
 *.bz2
+/nbproject/private/

src/lib/migration/product_checker.rb

@@ -0,0 +1,59 @@
+
+module Migration
+
+  class ProductChecker
+
+    def initialize(products)
+      @products = products
+    end
+
+    def obsoleted_product_repos
+
+    end
+
+    private 
+
+    attr_accessor :products
+
+    def available_obsolete_products
+      obsolete = []
+
+      new_products = select_products(:installed)
+      available_products = select_products(:available)
+
+      new_products.each do |new_product|
+        upgraded_products = available_products.select do |available_product|
+          available_product["name"] == new_product["name"] &&
+            product_version(available_product) < product_version(new_product)
+        end
+
+        obsolete.concat(upgraded_products)
+      end
+
+      obsolete
+    end
+
+    def select_products(status)
+      products.select { |product| product["status"] == status }
+    end
+
+    # returns product version (uses Gem::Version which properly parses the
+    # version string)
+    # @return [Gem::Version] product version
+    def product_version(product)
+      Gem::Version.new(product["version_version"])
+    end
+
+
+    # does one product upgrad another?
+    # @param [Hash] new_product new product
+    # @param [Hash] old_product new product
+    # @return [Boolean] true if the new product upgrades the old product
+    def product_upgrades?(new_product, old_product)
+      old_product["name"] == new_product["name"] &&
+            product_version(old_product) < product_version(new_product)
+    end
+
+  end
+
+end