1 files changed, 73 insertions, 0 deletions
diff --git a/lib/gitlab/ci/config/entry/factory.rb b/lib/gitlab/ci/config/entry/factory.rb
new file mode 100644
index 00000000000..9f5e393d191
--- /dev/null
+++ b/lib/gitlab/ci/config/entry/factory.rb
@@ -0,0 +1,73 @@
+module Gitlab
+  module Ci
+    class Config
+      module Entry
+        ##
+        # Factory class responsible for fabricating entry objects.
+        #
+        class Factory
+          class InvalidFactory < StandardError; end
+
+          def initialize(entry)
+            @entry = entry
+            @metadata = {}
+            @attributes = {}
+          end
+
+          def value(value)
+            @value = value
+            self
+          end
+
+          def metadata(metadata)
+            @metadata.merge!(metadata)
+            self
+          end
+
+          def with(attributes)
+            @attributes.merge!(attributes)
+            self
+          end
+
+          def create!
+            raise InvalidFactory unless defined?(@value)
+
+            ##
+            # We assume that unspecified entry is undefined.
+            # See issue #18775.
+            #
+            if @value.nil?
+              Entry::Unspecified.new(
+                fabricate_unspecified
+              )
+            else
+              fabricate(@entry, @value)
+            end
+          end
+
+          private
+
+          def fabricate_unspecified
+            ##
+            # If entry has a default value we fabricate concrete node
+            # with default value.
+            #
+            if @entry.default.nil?
+              fabricate(Entry::Undefined)
+            else
+              fabricate(@entry, @entry.default)
+            end
+          end
+
+          def fabricate(entry, value = nil)
+            entry.new(value, @metadata).tap do |node|
+              node.key = @attributes[:key]
+              node.parent = @attributes[:parent]
+              node.description = @attributes[:description]
+            end
+          end
+        end
+      end
+    end
+  end
+end