text: # Copyright (c) 2021, Moritz E. Beber.
  #
  # 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
  #
  #     https://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.
  
  
  """Provide an abstract interface for a sequence alignment service."""
  
  
  from abc import ABC, abstractmethod
  
  from Bio.Seq import Seq
  
  from ..model import SequenceAlignment
  
  
  class SequenceAlignmentService(ABC):
      """Define the abstract interface for a sequence alignment service."""
  
      @classmethod
      @abstractmethod
      def align(
          cls,
          query: Seq,
          target: Seq,
          gap_open_penalty: float = 2.0,
          gap_extension_penalty: float = 10.0,
          **kwargs,
      ) -> SequenceAlignment:
          """Return a local alignment of two given sequences."""
  