+# Copyright (C) 2021-2022 Wind River Systems, Inc.
+#
+# 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.
+
+from sqlalchemy.sql.elements import ColumnElement
+
+from o2common.helper import o2logging
+logger = o2logging.get_logger(__name__)
+
+
+def gen_filter(obj: ColumnElement, filter_str: str):
+ if filter_str == '':
+ return []
+ filter_without_space = filter_str.replace(" ", "")
+ items = filter_without_space.split(';')
+
+ filter_list = list()
+ for i in items:
+ if '(' in i:
+ i = i.replace("(", "")
+ if ')' in i:
+ i = i.replace(")", "")
+ filter_expr = i.split(',')
+ if len(filter_expr) < 3:
+ continue
+ filter_op = filter_expr[0]
+ filter_key = filter_expr[1]
+ filter_vals = filter_expr[2:]
+ filter_list.extend(toFilterArgs(
+ filter_op, obj, filter_key, filter_vals))
+ logger.info('Filter list length: %d' % len(filter_list))
+ return filter_list
+
+
+def toFilterArgs(operation: str, obj: ColumnElement, key: str, values: list):
+ if not hasattr(obj, key):
+ logger.warning('Filter attrName %s not in Object %s.' %
+ (key, str(obj)))
+ return []
+
+ ll = list()
+ if operation == 'eq':
+ for val in values:
+ if val.lower() == 'null':
+ val = None
+ ll.append(getattr(obj, key) == val)
+ elif operation == 'neq':
+ for val in values:
+ if val.lower() == 'null':
+ val = None
+ ll.append(getattr(obj, key) != val)
+ elif operation == 'gt':
+ for val in values:
+ ll.append(getattr(obj, key) > val)
+ elif operation == 'lt':
+ for val in values:
+ ll.append(getattr(obj, key) < val)
+ elif operation == 'gte':
+ for val in values:
+ ll.append(getattr(obj, key) >= val)
+ elif operation == 'lte':
+ for val in values:
+ ll.append(getattr(obj, key) <= val)
+ elif operation == 'in':
+ pass
+ elif operation == 'nin':
+ pass
+ elif operation == 'count':
+ pass
+ elif operation == 'ncount':
+ pass
+ else:
+ raise KeyError('Filter operation value not support.')
+
+ return ll