class Jars::Installer

def jars?
  # first look if there are any requirements in the spec
  # and then if gem depends on jar-dependencies for runtime.
  # only then install the jars declared in the requirements
  result = (spec = self.spec) && !spec.requirements.empty? &&
           spec.dependencies.detect { |d| d.name == 'jar-dependencies' && d.type == :runtime }
  if result && spec.platform.to_s != 'java'
    Jars.warn "\njar dependencies found on non-java platform gem - do not install jars\n"
    false
  else
    result
  end
end