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from typing import TypeVar, List, Tuple
import act4e_interfaces as I
from .sets_representation import SolFiniteSetRepresentation
A = TypeVar("A")
B = TypeVar("B")
class MyFiniteRelation(I.FiniteRelation[A,B]):
_source: I.FiniteSet[A]
_target: I.FiniteSet[B]
_values: List[Tuple[A,B]]
def __init__(self, source: I.FiniteSet[A], target: I.FiniteSet[B], values: List[Tuple[A,B]]):
self._source = source
self._target = target
self._values = values
def source(self) -> I.FiniteSet[A]:
return self._source
def target(self) -> I.FiniteSet[B]:
return self._target
def holds(self, a: A, b: B) -> bool:
for v, u in self._values:
if self._source.equal(v, a) and self._target.equal(u, b):
return True
return False
class SolFiniteRelationRepresentation(I.FiniteRelationRepresentation):
def load(self, h: I.IOHelper, data: I.FiniteRelation_desc) -> I.FiniteRelation[A, B]:
fsr = SolFiniteSetRepresentation()
src = fsr.load(h, data["source"])
dst = fsr.load(h, data["target"])
values = []
for v in data["values"]:
a, b = src.load(h, v[0]), dst.load(h, v[1])
if not src.contains(a):
raise I.InvalidFormat()
if not dst.contains(b):
raise I.InvalidFormat()
values.append([a, b])
return MyFiniteRelation(src, dst, values)
def save(self, h: I.IOHelper, f: I.FiniteRelation[A, B]) -> I.FiniteRelation_desc:
fsr = SolFiniteSetRepresentation()
d = {
"source": fsr.save(h, f.source()),
"target": fsr.save(h, f.target()),
"values": [],
}
for a in f.source().elements():
for b in f.target().elements():
if f.holds(a, b):
d["values"].append([
f.source().save(h, a),
f.target().save(h, b)])
return d
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