1 files changed, 71 insertions, 0 deletions
diff --git a/lib/rubygems/resolver/dependency_request.rb b/lib/rubygems/resolver/dependency_request.rb
new file mode 100644
index 0000000000..e63b443c62
--- /dev/null
+++ b/lib/rubygems/resolver/dependency_request.rb
@@ -0,0 +1,71 @@
+##
+# Used Internally. Wraps a Dependency object to also track which spec
+# contained the Dependency.
+
+class Gem::Resolver::DependencyRequest
+
+  attr_reader :dependency
+
+  attr_reader :requester
+
+  def initialize(dep, act)
+    @dependency = dep
+    @requester = act
+  end
+
+  def ==(other)
+    case other
+    when Gem::Dependency
+      @dependency == other
+    when Gem::Resolver::DependencyRequest
+      @dependency == other.dependency && @requester == other.requester
+    else
+      false
+    end
+  end
+
+  def matches_spec?(spec)
+    @dependency.matches_spec? spec
+  end
+
+  def name
+    @dependency.name
+  end
+
+  # Indicate that the request is for a gem explicitly requested by the user
+  def explicit?
+    @requester.nil?
+  end
+
+  # Indicate that the requset is for a gem requested as a dependency of another gem
+  def implicit?
+    !explicit?
+  end
+
+  # Return a String indicating who caused this request to be added (only
+  # valid for implicit requests)
+  def request_context
+    @requester ? @requester.request : "(unknown)"
+  end
+
+  def pretty_print q # :nodoc:
+    q.group 2, '[Dependency request ', ']' do
+      q.breakable
+      q.text @dependency.to_s
+
+      q.breakable
+      q.text ' requested by '
+      q.pp @requester
+    end
+  end
+
+  def requirement
+    @dependency.requirement
+  end
+
+  def to_s # :nodoc:
+    @dependency.to_s
+  end
+
+end
+