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""" |
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ETLT |
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Copyright 2016 Set Based IT Consultancy |
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Licence MIT |
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""" |
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from etlt.condition.SimpleConditionFactory import SimpleConditionFactory |
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from etlt.condition.Condition import Condition |
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class InListCondition(Condition): |
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""" |
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A list condition matches a single field against a list of conditions. |
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""" |
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# ------------------------------------------------------------------------------------------------------------------ |
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def __init__(self, field): |
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""" |
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Object contructor. |
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:param str field: The name of the field in the row that must be match against the expression. |
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""" |
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self._field = field |
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""" |
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The name of the field in the row that must be match against the list of values. |
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:type: str |
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""" |
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self._values = list() |
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""" |
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The list of values of plain conditions. |
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:type: list[str] |
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""" |
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self._conditions = list() |
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""" |
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The list of other conditions. |
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:type: list[etlt.condition.SimpleCondition.SimpleCondition] |
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""" |
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# ------------------------------------------------------------------------------------------------------------------ |
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@property |
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def field(self): |
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""" |
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Getter for field. |
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:rtype: str |
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""" |
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return self._field |
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# ------------------------------------------------------------------------------------------------------------------ |
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def populate_values(self, rows, field): |
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""" |
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Populates the filter values of this filter using list of rows. |
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:param list[dict[str,T]] rows: The row set. |
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:param str field: The field name. |
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""" |
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self._values.clear() |
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for row in rows: |
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condition = SimpleConditionFactory.create_condition(self._field, row[field]) |
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if condition.scheme == 'plain': |
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self._values.append(condition.expression) |
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else: |
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self._conditions.append(condition) |
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# ------------------------------------------------------------------------------------------------------------------ |
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def match(self, row): |
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""" |
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Returns True if the field is in the list of conditions. Returns False otherwise. |
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:param dict row: The row. |
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:rtype: bool |
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""" |
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if row[self._field] in self._values: |
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return True |
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for condition in self._conditions: |
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if condition.match(row): |
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return True |
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return False |
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# ---------------------------------------------------------------------------------------------------------------------- |
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PyETLT /
etlt
