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"""Class represents grouping strategy.""" |
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STAGE_NOT_IN_STRATEGY_ = "Stage not considered in strategy." |
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class GroupingStrategy(object): |
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"""Class represents grouping strategy. |
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Attributes: |
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ordred_stages (list): List of stages which represent order in strategy. |
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groups (dict): Contains information about groups. |
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Key is stage and value is number of group. |
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""" |
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def __init__(self, ordered_stages): |
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"""Constructor.""" |
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self.ordered_stages = ordered_stages |
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self.groups = {} |
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def define_group(self, group_of_stages): |
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"""Add group of stages. Those stages will be in the same group. |
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Raises: |
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ValueError: If stage couldn't be added to new group. |
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Args: |
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group_of_stages (tuple): group of stages""" |
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group_number = self.get_actual_numbers_of_groups() |
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for stage in group_of_stages: |
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if stage in self.groups.keys(): |
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raise ValueError("Stage already added.") |
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elif stage not in self.ordered_stages: |
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raise ValueError("Stage not considered in strategy.") |
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else: |
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self.groups[stage] = group_number |
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def get_actual_numbers_of_groups(self): |
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"""Returns how many groups already. |
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Returns: |
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int: amount of groups |
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""" |
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if len(self.groups) == 0: |
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return 0 |
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else: |
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return sorted(self.groups.values())[-1] + 1 |
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def get_items_from_the_same_group(self, stage): |
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"""Returns list of stages from group in which is already stage. |
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Returns: |
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list: list of stages from group ordered as in self.ordered_stages |
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Raises: |
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ValueError: If stage is not in strategy. |
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Args: |
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stage (AbstractStage): stage""" |
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if stage not in self.groups: |
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raise ValueError(STAGE_NOT_IN_STRATEGY_) |
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group_number = self.groups[stage] |
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stages_from_group = [] |
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for cur_stage in self.ordered_stages: |
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if self.groups[cur_stage] == group_number: |
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stages_from_group.append(cur_stage) |
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return stages_from_group |
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def get_items_from_group(self, group_number): |
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"""Returns list of stages from group with 'group_number'. |
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Returns: |
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list: list of stages from group ordered as in |
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self.ordered_stages |
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Raises: |
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ValueError: If wrong number of groups. |
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Args: |
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group_number (int): number of group""" |
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if group_number not in range(0, self.get_actual_numbers_of_groups()): |
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raise ValueError |
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stages_to_return = [] |
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for current_stage in self.ordered_stages: |
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if self.groups[current_stage] == group_number: |
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stages_to_return.append(current_stage) |
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return stages_to_return |
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qbahn /
grortir
