Import RubyGems trunk revision 1493.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13862 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/dependency.rb

@@ -0,0 +1,65 @@
+#--
+# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
+# All rights reserved.
+# See LICENSE.txt for permissions.
+#++
+
+require 'rubygems'
+
+##
+# The Dependency class holds a Gem name and a Gem::Requirement
+class Gem::Dependency
+
+  attr_accessor :name
+
+  attr_writer :version_requirements
+
+  def <=>(other)
+    [@name] <=> [other.name]
+  end
+
+  ##
+  # Constructs the dependency
+  #
+  # name:: [String] name of the Gem
+  # version_requirements:: [String Array] version requirement (e.g. ["> 1.2"])
+  #
+  def initialize(name, version_requirements)
+    @name = name
+    @version_requirements = Gem::Requirement.create version_requirements
+    @version_requirement = nil   # Avoid warnings.
+  end
+
+  def version_requirements
+    normalize if defined? @version_requirement and @version_requirement
+    @version_requirements
+  end
+
+  def requirement_list
+    version_requirements.as_list
+  end
+
+  alias requirements_list requirement_list
+
+  def normalize
+    ver = @version_requirement.instance_eval { @version }
+    @version_requirements = Gem::Requirement.new([ver])
+    @version_requirement = nil
+  end
+
+  def to_s # :nodoc:
+    "#{name} (#{version_requirements})"
+  end
+
+  def ==(other) # :nodoc:
+    self.class === other &&
+      self.name == other.name &&
+      self.version_requirements == other.version_requirements
+  end
+
+  def hash
+    name.hash + version_requirements.hash
+  end
+
+end
+