1 files changed, 172 insertions, 0 deletions
diff --git a/ruby_2_2/lib/rubygems/resolver/activation_request.rb b/ruby_2_2/lib/rubygems/resolver/activation_request.rb
new file mode 100644
index 0000000000..56c6363e4f
--- /dev/null
+++ b/ruby_2_2/lib/rubygems/resolver/activation_request.rb
@@ -0,0 +1,172 @@
+##
+# Specifies a Specification object that should be activated.  Also contains a
+# dependency that was used to introduce this activation.
+
+class Gem::Resolver::ActivationRequest
+
+  ##
+  # The parent request for this activation request.
+
+  attr_reader :request
+
+  ##
+  # The specification to be activated.
+
+  attr_reader :spec
+
+  ##
+  # Creates a new ActivationRequest that will activate +spec+.  The parent
+  # +request+ is used to provide diagnostics in case of conflicts.
+  #
+  # +others_possible+ indicates that other specifications may also match this
+  # activation request.
+
+  def initialize spec, request, others_possible = true
+    @spec = spec
+    @request = request
+    @others_possible = others_possible
+  end
+
+  def == other # :nodoc:
+    case other
+    when Gem::Specification
+      @spec == other
+    when Gem::Resolver::ActivationRequest
+      @spec == other.spec && @request == other.request
+    else
+      false
+    end
+  end
+
+  ##
+  # Is this activation request for a development dependency?
+
+  def development?
+    @request.development?
+  end
+
+  ##
+  # Downloads a gem at +path+ and returns the file path.
+
+  def download path
+    if @spec.respond_to? :source
+      source = @spec.source
+    else
+      source = Gem.sources.first
+    end
+
+    Gem.ensure_gem_subdirectories path
+
+    source.download full_spec, path
+  end
+
+  ##
+  # The full name of the specification to be activated.
+
+  def full_name
+    @spec.full_name
+  end
+
+  ##
+  # The Gem::Specification for this activation request.
+
+  def full_spec
+    Gem::Specification === @spec ? @spec : @spec.spec
+  end
+
+  def inspect # :nodoc:
+    others =
+      case @others_possible
+      when true then # TODO remove at RubyGems 3
+        ' (others possible)'
+      when false then # TODO remove at RubyGems 3
+        nil
+      else
+        unless @others_possible.empty? then
+          others = @others_possible.map { |s| s.full_name }
+          " (others possible: #{others.join ', '})"
+        end
+      end
+
+    '#<%s for %p from %s%s>' % [
+      self.class, @spec, @request, others
+    ]
+  end
+
+  ##
+  # True if the requested gem has already been installed.
+
+  def installed?
+    case @spec
+    when Gem::Resolver::VendorSpecification then
+      true
+    else
+      this_spec = full_spec
+
+      Gem::Specification.any? do |s|
+        s == this_spec
+      end
+    end
+  end
+
+  ##
+  # The name of this activation request's specification
+
+  def name
+    @spec.name
+  end
+
+  ##
+  # Indicate if this activation is one of a set of possible
+  # requests for the same Dependency request.
+
+  def others_possible?
+    case @others_possible
+    when true, false then
+      @others_possible
+    else
+      not @others_possible.empty?
+    end
+  end
+
+  ##
+  # Return the ActivationRequest that contained the dependency
+  # that we were activated for.
+
+  def parent
+    @request.requester
+  end
+
+  def pretty_print q # :nodoc:
+    q.group 2, '[Activation request', ']' do
+      q.breakable
+      q.pp @spec
+
+      q.breakable
+      q.text ' for '
+      q.pp @request
+
+      case @others_possible
+      when false then
+      when true then
+        q.breakable
+        q.text 'others possible'
+      else
+        unless @others_possible.empty? then
+          q.breakable
+          q.text 'others '
+          q.pp @others_possible.map { |s| s.full_name }
+        end
+      end
+    end
+  end
+
+  ##
+  # The version of this activation request's specification
+
+  def version
+    @spec.version
+  end
+
+end
+