1 files changed, 61 insertions, 0 deletions
diff --git a/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_vertex.rb b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_vertex.rb
new file mode 100644
index 0000000000..eda4251801
--- /dev/null
+++ b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_vertex.rb
@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/action'
+module Bundler::Molinillo
+  class DependencyGraph
+    # @!visibility private
+    # (see DependencyGraph#add_vertex)
+    class AddVertex < Action # :nodoc:
+      # @!group Action
+
+      # (see Action.action_name)
+      def self.action_name
+        :add_vertex
+      end
+
+      # (see Action#up)
+      def up(graph)
+        if existing = graph.vertices[name]
+          @existing_payload = existing.payload
+          @existing_root = existing.root
+        end
+        vertex = existing || Vertex.new(name, payload)
+        graph.vertices[vertex.name] = vertex
+        vertex.payload ||= payload
+        vertex.root ||= root
+        vertex
+      end
+
+      # (see Action#down)
+      def down(graph)
+        if defined?(@existing_payload)
+          vertex = graph.vertices[name]
+          vertex.payload = @existing_payload
+          vertex.root = @existing_root
+        else
+          graph.vertices.delete(name)
+        end
+      end
+
+      # @!group AddVertex
+
+      # @return [String] the name of the vertex
+      attr_reader :name
+
+      # @return [Object] the payload for the vertex
+      attr_reader :payload
+
+      # @return [Boolean] whether the vertex is root or not
+      attr_reader :root
+
+      # Initialize an action to add a vertex to a dependency graph
+      # @param [String] name the name of the vertex
+      # @param [Object] payload the payload for the vertex
+      # @param [Boolean] root whether the vertex is root or not
+      def initialize(name, payload, root)
+        @name = name
+        @payload = payload
+        @root = root
+      end
+    end
+  end
+end