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pql.py
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pql.py
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import uuid
from typing import List, Dict
class Context:
def __init__(self):
super().__init__()
def create_query_context(self, entity_type):
return EntityContext(self, entity_type)
def list_entity(self, entity_name: str, where_clause=None, group_by_clause=None):
pass
def get_aggregate_function(self, name: str):
pass
#
class RootContext(Context):
def __init__(self, entity_list_resolver, aggregate_functions):
super().__init__()
self.entity_list_resolver = entity_list_resolver
self.aggregate_functions = aggregate_functions
def list_entity(self, entity_name: str, where_clause=None, group_by_clause=None):
return self.entity_list_resolver(
entity_name, where_clause=where_clause, group_by_clause=group_by_clause
)
def get_aggregate_function(self, name: str):
return self.aggregate_functions(name)
class ChildContext(Context):
def __init__(self, parent: Context = None):
super().__init__()
self.parent: Context = parent
def list_entity(self, entity_name: str, where_clause=None, group_by_clause=None):
return self.parent.list_entity(entity_name, where_clause, group_by_clause)
def get_aggregate_function(self, name: str):
return self.parent.get_aggregate_function(name)
class EntityContext(ChildContext):
def __init__(self, parent: Context, entity):
super().__init__(parent)
self.entity = entity
class AggFunction:
def execute(self, result):
pass
class SelectEntry:
def __init__(self, name: str):
self.name: str = name
def execute(self, context: Context):
pass
class Projection(SelectEntry):
def __init__(self, field: str, name=None):
super().__init__(name or field)
self.field: str = field
def execute(self, context: Context):
entity = context.entity
if isinstance(entity, Dict):
if self.field == "*":
return entity
if not self.field in entity:
print(f"Missing {self.field}?")
return entity.get(self.field)
elif isinstance(entity, List):
return self.execute(EntityContext(context, entity[0]))
else:
raise Exception("...")
class SubQuery(SelectEntry):
def __init__(self, query: "Query", name: str):
super().__init__(name)
self.query: Query = query
def execute(self, context: Context):
entity = context.entity
if isinstance(entity, Dict):
self.query.where_clause = lambda o: entity.get("start") <= o.get(
"start"
) and o.get("start") < entity.get("end")
return self.query.execute(context)
else:
raise NotImplementedError("")
class Aggregation(SelectEntry):
def __init__(self, agg_function_name: str, query: "Query", name: str = None):
super().__init__(name or "agg")
self.agg_function_name: str = agg_function_name
self.query: Query = query
def execute(self, context: Context):
entity = context.entity
if isinstance(entity, Dict):
self.query.where_clause = lambda o: entity.get("start") <= o.get(
"start"
) and o.get("start") < entity.get("end")
result = self.query.execute(context)
agg_function: AggFunction = context.get_aggregate_function(
self.agg_function_name
)
return agg_function.execute(result)
elif isinstance(entity, List):
# Do what we want to do on all subcontexts
results = []
for e in entity:
self.query.where_clause = lambda o: e.get("start") <= o.get(
"start"
) and o.get("start") < e.get("end")
result = self.query.execute(context)
results.extend(result)
agg_function: AggFunction = context.get_aggregate_function(
self.agg_function_name
)
return agg_function.execute(results)
class Predicate(object):
def check(self, entity: dict) -> bool:
raise NotImplementedError()
class EqPredicate(Predicate):
def __init__(self, property: str, value):
self.property: str = property
self.value = value
def check(self, entity: dict) -> bool:
if self.property in entity:
if type(self.value) == uuid:
return str(entity.get(self.property)) == str(self.value)
else:
return entity.get(self.property) == self.value
else:
raise ValueError(
f"Trying predicate check on {entity} field {self.property} but does not exist"
)
class GreaterPredicate(Predicate):
def __init__(self, property: str, value):
self.property: str = property
self.value = value
def check(self, entity: dict) -> bool:
if self.property in entity:
if type(self.value) == uuid:
return str(entity.get(self.property)) > str(self.value)
else:
return entity.get(self.property) > self.value
else:
raise ValueError(
f"Trying predicate check on {entity} field {self.property} but does not exist"
)
class GreaterEqPredicate(Predicate):
def __init__(self, property: str, value):
self.property: str = property
self.value = value
def check(self, entity: dict) -> bool:
if self.property in entity:
if type(self.value) == uuid:
return str(entity.get(self.property)) >= str(self.value)
else:
return entity.get(self.property) >= self.value
else:
raise ValueError(
f"Trying predicate check on {entity} field {self.property} but does not exist"
)
class LowerPredicate(Predicate):
def __init__(self, property: str, value):
self.property: str = property
self.value = value
def check(self, entity: dict) -> bool:
if self.property in entity:
if type(self.value) == uuid:
return str(entity.get(self.property)) < str(self.value)
else:
return entity.get(self.property) < self.value
else:
raise ValueError(
f"Trying predicate check on {entity} field {self.property} but does not exist"
)
class LowerEqPredicate(Predicate):
def __init__(self, property: str, value):
self.property: str = property
self.value = value
def check(self, entity: dict) -> bool:
if self.property in entity:
if type(self.value) == uuid:
return str(entity.get(self.property)) <= str(self.value)
else:
return entity.get(self.property) <= self.value
else:
raise ValueError(
f"Trying predicate check on {entity} field {self.property} but does not exist"
)
class Query:
def __init__(
self,
selects: List[SelectEntry],
entity_type: str,
where_clause: Predicate = None,
group_by_clause: List[Projection] = None,
):
self.selects: List[SelectEntry] = selects
self.entity: str = entity_type
self.where_clause = where_clause
self.group_by_clause = group_by_clause
def execute(self, context: Context) -> List[Dict]:
##wieso machen wir die Logic von InMemoryAssetRetriever nicht hier rein???
##wei lhier würde es ja Sinn machen und hingehören wenn ich das Query excute soll es mit ja die Entitys zurück geben
objects = context.list_entity(
self.entity, self.where_clause, self.group_by_clause
)
results = []
for o in objects:
ctx = context.create_query_context(o)
for s in self.selects:
if s.name == "*":
results.append(s.execute(ctx))
else:
results.append(dict([(s.name, s.execute(ctx))]))
return results
class CountFunction(AggFunction):
def execute(self, result):
return len(result)
class Flatten(AggFunction):
def execute(self, result):
"""
We assume here that we only have one key
"""
if len(result) > 0 and len(list(result)[0].keys()) == 1:
return [res.get(list(res.keys())[0]) for res in result]
else:
return result
agg_functions: dict = {"count": CountFunction(), "flatten": Flatten()}