1 files changed, 66 insertions, 0 deletions
diff --git a/jni/ruby/lib/rubygems/resolver/composed_set.rb b/jni/ruby/lib/rubygems/resolver/composed_set.rb
new file mode 100644
index 0000000..5b08f12
--- /dev/null
+++ b/jni/ruby/lib/rubygems/resolver/composed_set.rb
@@ -0,0 +1,66 @@
+##
+# A ComposedSet allows multiple sets to be queried like a single set.
+#
+# To create a composed set with any number of sets use:
+#
+#   Gem::Resolver.compose_sets set1, set2
+#
+# This method will eliminate nesting of composed sets.
+
+class Gem::Resolver::ComposedSet < Gem::Resolver::Set
+
+  attr_reader :sets # :nodoc:
+
+  ##
+  # Creates a new ComposedSet containing +sets+.  Use
+  # Gem::Resolver::compose_sets instead.
+
+  def initialize *sets
+    super()
+
+    @sets = sets
+  end
+
+  ##
+  # When +allow_prerelease+ is set to +true+ prereleases gems are allowed to
+  # match dependencies.
+
+  def prerelease= allow_prerelease
+    super
+
+    sets.each do |set|
+      set.prerelease = allow_prerelease
+    end
+  end
+
+  ##
+  # Sets the remote network access for all composed sets.
+
+  def remote= remote
+    super
+
+    @sets.each { |set| set.remote = remote }
+  end
+
+  def errors
+    @errors + @sets.map { |set| set.errors }.flatten
+  end
+
+  ##
+  # Finds all specs matching +req+ in all sets.
+
+  def find_all req
+    @sets.map do |s|
+      s.find_all req
+    end.flatten
+  end
+
+  ##
+  # Prefetches +reqs+ in all sets.
+
+  def prefetch reqs
+    @sets.each { |s| s.prefetch(reqs) }
+  end
+
+end
+