text: # Copyright 2020 Francesco Ceccon
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  import pyomo.environ as pe
  
  from pooling_network.formulation.pq_block import PoolingPQFormulationData
  
  
  def pooling_data_objects(block, descend_into=True, active=None, sort=False):
      for b in block.component_data_objects(pe.Block, descend_into=descend_into, active=active, sort=sort):
          if isinstance(b, PoolingPQFormulationData):
              yield b
  