old_contents: # Copyright (c) 2013, Open Source Robotics Foundation
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #
  #     * Redistributions of source code must retain the above copyright
  #       notice, this list of conditions and the following disclaimer.
  #     * Redistributions in binary form must reproduce the above copyright
  #       notice, this list of conditions and the following disclaimer in the
  #       documentation and/or other materials provided with the distribution.
  #     * Neither the name of the Willow Garage, Inc. nor the names of its
  #       contributors may be used to endorse or promote products derived from
  #       this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  
  # Author Paul Mathieu/paul@osrfoundation.org
  
  import rosdistro
  import warnings
  
  class PreRep137Warning(UserWarning):
      pass
  
  class RDCache:
      index_url = None
      index = None
      release_files = {}
  
  def _check_cache():
      if RDCache.index_url != rosdistro.get_index_url():
          RDCache.index_url = rosdistro.get_index_url()
          RDCache.index = None
          RDCache.release_files = {}
  
  
  def get_index():
      _check_cache()
      if RDCache.index is None:
          RDCache.index = rosdistro.get_index(RDCache.index_url)
      return RDCache.index
  
  def get_release_file(distro):
      _check_cache()
      if distro not in RDCache.release_files:
          RDCache.release_files[distro] = rosdistro.get_release_file(get_index(), distro)
      return RDCache.release_files[distro]
  
  def get_targets():
      return dict((d, get_release_file(d).platforms) for d in get_index().distributions)
  
new_contents: # Copyright (c) 2013, Open Source Robotics Foundation
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #
  #     * Redistributions of source code must retain the above copyright
  #       notice, this list of conditions and the following disclaimer.
  #     * Redistributions in binary form must reproduce the above copyright
  #       notice, this list of conditions and the following disclaimer in the
  #       documentation and/or other materials provided with the distribution.
  #     * Neither the name of the Willow Garage, Inc. nor the names of its
  #       contributors may be used to endorse or promote products derived from
  #       this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  
  # Author Paul Mathieu/paul@osrfoundation.org
  
  import rosdistro
  import warnings
  
  class PreRep137Warning(UserWarning):
      pass
  
  class  _RDCache:
      index_url = None
      index = None
      release_files = {}
  
  def _check_cache():
      if _RDCache.index_url != rosdistro.get_index_url():
          _RDCache.index_url = rosdistro.get_index_url()
          _RDCache.index = None
          _RDCache.release_files = {}
  
  
  def get_index():
      _check_cache()
      if _RDCache.index is None:
          _RDCache.index = rosdistro.get_index(_RDCache.index_url)
      return _RDCache.index
  
  def get_release_file(distro):
      _check_cache()
      if distro not in _RDCache.release_files:
          _RDCache.release_files[distro] = rosdistro.get_release_file(get_index(), distro)
      return _RDCache.release_files[distro]
  
  def get_targets():
      return dict((d, get_release_file(d).platforms) for d in get_index().distributions)
  
subject: Use private class for the cache in rosdistrohelper