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""" |
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Class Parameter Handling |
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Facilitates handling parameters values |
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""" |
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# package to handle dates and times |
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from datetime import datetime as ClassDT |
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from datetime import timedelta |
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# package to facilitate common operations |
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from db_extractor.BasicNeeds import BasicNeeds |
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# package to facilitate regular expressions |
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import re |
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class ParameterHandling: |
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lcl_bn = None |
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def __init__(self): |
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self.lcl_bn = BasicNeeds() |
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def build_parameters(self, local_logger, query_session_parameters, in_parameter_rules): |
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local_logger.debug('Seen Parameters are: ' + str(query_session_parameters)) |
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parameters_type = type(query_session_parameters) |
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local_logger.debug('Parameters type is ' + str(parameters_type)) |
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if str(parameters_type) == "<class 'dict'>": |
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tp = tuple(query_session_parameters.values()) |
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elif str(parameters_type) == "<class 'list'>": |
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tp = tuple(query_session_parameters) |
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else: |
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local_logger.error('Unknown parameter type (expected either Dictionary or List)') |
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exit(1) |
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local_logger.debug('Initial Tuple for Parameters is: ' + str(tp)) |
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return self.stringify_parameters(local_logger, tp, in_parameter_rules) |
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def calculate_date_from_expression(self, local_logger, expression_parts): |
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final_string = '' |
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current_date = ClassDT.today() |
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if expression_parts[1] == 'CYCW': |
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if len(expression_parts) >= 3: |
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current_date = current_date + timedelta(weeks=int(expression_parts[2])) |
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week_iso_num = ClassDT.isocalendar(current_date)[1] |
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final_string = str(ClassDT.isocalendar(current_date)[0])\ |
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+ self.lcl_bn.fn_numbers_with_leading_zero(str(week_iso_num), 2) |
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else: |
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local_logger.error('Unknown expression encountered ' |
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+ str(expression_parts[1]) + '...') |
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exit(1) |
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return final_string |
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def handle_query_parameters(self, local_logger, given_session): |
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tp = None |
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if 'parameters' in given_session: |
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parameter_rules = [] |
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if 'parameters-handling-rules' in given_session: |
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parameter_rules = given_session['parameters-handling-rules'] |
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tp = self.build_parameters(local_logger, given_session['parameters'], parameter_rules) |
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return tp |
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@staticmethod |
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def manage_parameter_value(given_prefix, given_parameter, given_parameter_rules): |
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element_to_join = '' |
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if given_prefix == 'dict': |
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element_to_join = given_parameter.values() |
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elif given_prefix == 'list': |
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element_to_join = given_parameter |
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return given_parameter_rules[given_prefix + '-values-prefix'] \ |
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+ given_parameter_rules[given_prefix + '-values-glue'].join(element_to_join) \ |
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+ given_parameter_rules[given_prefix + '-values-suffix'] |
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def simulate_final_query(self, local_logger, timered, in_query, in_parameters_number, in_tp): |
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timered.start() |
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return_query = in_query |
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if in_parameters_number > 0: |
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try: |
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return_query = in_query % in_tp |
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local_logger.info('Query with parameters interpreted is: ' |
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+ self.lcl_bn.fn_multi_line_string_to_single_line(return_query)) |
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except TypeError as e: |
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local_logger.debug('Initial query expects ' + str(in_parameters_number) |
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+ ' parameters but only ' + str(len(in_tp)) |
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+ ' parameters were provided!') |
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local_logger.error(e) |
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timered.stop() |
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def special_case_string(self, local_logger, crt_parameter): |
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resulted_parameter_value = crt_parameter |
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matching_rule = re.search(r'(CalculatedDate\_[A-Z]{4}\_(-*)[0-9]{1,2})', crt_parameter) |
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if matching_rule: |
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parameter_value_parts = matching_rule.group().split('_') |
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calculated_parameter_value = self.calculate_date_from_expression(local_logger, |
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parameter_value_parts) |
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resulted_parameter_value = re.sub(matching_rule.group(), calculated_parameter_value, |
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crt_parameter) |
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local_logger.debug('Current Parameter is STR ' |
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+ 'and has been re-interpreted as value: ' |
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+ str(resulted_parameter_value)) |
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return resulted_parameter_value |
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def stringify_parameters(self, local_logger, tuple_parameters, given_parameter_rules): |
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working_list = [] |
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for ndx, crt_parameter in enumerate(tuple_parameters): |
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current_parameter_type = str(type(crt_parameter)) |
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working_list.append(ndx) |
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if current_parameter_type == "<class 'str'>": |
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local_logger.debug('Current Parameter is STR and has the value: ' + crt_parameter) |
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working_list[ndx] = self.special_case_string(local_logger, crt_parameter) |
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elif current_parameter_type in ("<class 'list'>", "<class 'dict'>"): |
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prefix = current_parameter_type.replace("<class '", '').replace("'>", '') |
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local_logger.debug('Current Parameter is ' + prefix.upper() |
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+ ' and has the value: ' + str(crt_parameter)) |
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working_list[ndx] = self.manage_parameter_value(prefix.lower(), crt_parameter, |
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given_parameter_rules) |
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final_tuple = tuple(working_list) |
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local_logger.debug('Final Tuple for Parameters is: ' + str(final_tuple)) |
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return final_tuple |
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danielgp /
db-extractor
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