1 files changed, 69 insertions, 0 deletions
diff --git a/lib/rubygems/resolver/index_specification.rb b/lib/rubygems/resolver/index_specification.rb
new file mode 100644
index 0000000000..56fecb5753
--- /dev/null
+++ b/lib/rubygems/resolver/index_specification.rb
@@ -0,0 +1,69 @@
+##
+# Represents a possible Specification object returned from IndexSet.  Used to
+# delay needed to download full Specification objects when only the +name+
+# and +version+ are needed.
+
+class Gem::Resolver::IndexSpecification < Gem::Resolver::Specification
+
+  ##
+  # An IndexSpecification is created from the index format described in `gem
+  # help generate_index`.
+  #
+  # The +set+ contains other specifications for this (URL) +source+.
+  #
+  # The +name+, +version+ and +platform+ are the name, version and platform of
+  # the gem.
+
+  def initialize set, name, version, source, platform
+    super()
+
+    @set = set
+    @name = name
+    @version = version
+    @source = source
+    @platform = platform.to_s
+
+    @spec = nil
+  end
+
+  ##
+  # The dependencies of the gem for this specification
+
+  def dependencies
+    spec.dependencies
+  end
+
+  def inspect # :nodoc:
+    '#<%s %s source %s>' % [self.class, full_name, @source]
+  end
+
+  def pretty_print q # :nodoc:
+    q.group 2, '[Index specification', ']' do
+      q.breakable
+      q.text full_name
+
+      unless Gem::Platform::RUBY == @platform then
+        q.breakable
+        q.text @platform.to_s
+      end
+
+      q.breakable
+      q.text 'source '
+      q.pp @source
+    end
+  end
+
+  ##
+  # Fetches a Gem::Specification for this IndexSpecification from the #source.
+
+  def spec # :nodoc:
+    @spec ||=
+      begin
+        tuple = Gem::NameTuple.new @name, @version, @platform
+
+        @source.fetch_spec tuple
+      end
+  end
+
+end
+