#
# GAMS - General Algebraic Modeling System Python API
#
# Copyright (c) 2023 GAMS Development Corp. <support@gams.com>
# Copyright (c) 2023 GAMS Software GmbH <support@gams.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
from __future__ import annotations
from typing import Any
from typing import List
from typing import Optional
from typing import TYPE_CHECKING
from typing import Union
import gams.transfer as gt
import pandas as pd
import gamspy as gp
import gamspy._algebra.condition as condition
import gamspy._algebra.expression as expression
import gamspy._algebra.operable as operable
import gamspy._symbols.implicits as implicits
import gamspy.utils as utils
from gamspy._symbols.symbol import Symbol
if TYPE_CHECKING:
from gamspy import Set, Container
from gamspy._algebra.expression import Expression
[docs]class Parameter(gt.Parameter, operable.Operable, Symbol):
"""
Represents a parameter symbol in GAMS.
https://www.gams.com/latest/docs/UG_DataEntry.html#UG_DataEntry_Parameters
Parameters
----------
container : Container
name : str
domain : list, optional
records : Any, optional
domain_forwarding : bool, optional
description : str, optional
uels_on_axes : bool
Examples
--------
>>> import gamspy as gp
>>> m = gp.Container()
>>> i = gp.Set(m, "i", records=['i1','i2'])
>>> a = gp.Parameter(m, "a", [i], records=[['i1',1],['i2',2]])
"""
def __new__(
cls,
container: Container,
name: str,
domain: Optional[List[Union[str, Set]]] = None,
records: Optional[Any] = None,
domain_forwarding: bool = False,
description: str = "",
uels_on_axes: bool = False,
):
if not isinstance(container, gp.Container):
raise TypeError(
"Container must of type `Container` but found"
f" {type(container)}"
)
if not isinstance(name, str):
raise TypeError(f"Name must of type `str` but found {type(name)}")
try:
symbol = container[name]
if isinstance(symbol, cls):
return symbol
else:
raise TypeError(
f"Cannot overwrite symbol `{name}` in container"
" because it is not a Parameter object)"
)
except KeyError:
return object.__new__(cls)
def __init__(
self,
container: Container,
name: str,
domain: Optional[List[Union[str, Set]]] = None,
records: Optional[Any] = None,
domain_forwarding: bool = False,
description: str = "",
uels_on_axes: bool = False,
):
self._is_dirty = False
self._is_frozen = False
name = utils._reserved_check(name)
super().__init__(
container,
name,
domain,
records,
domain_forwarding,
description,
uels_on_axes,
)
self._container_check(self.domain)
self.where = condition.Condition(self)
self.container._add_statement(self)
def __getitem__(
self, indices: Union[tuple, str]
) -> implicits.ImplicitParameter:
domain = self.domain if indices == ... else utils._to_list(indices)
return implicits.ImplicitParameter(self, name=self.name, domain=domain)
def __setitem__(
self,
indices: Union[tuple, str, implicits.ImplicitSet],
assignment: Union[Expression, float, int],
) -> None:
domain = self.domain if indices == ... else utils._to_list(indices)
self._container_check(domain)
if isinstance(assignment, float):
assignment = utils._map_special_values(assignment) # type: ignore
statement = expression.Expression(
implicits.ImplicitParameter(self, name=self.name, domain=domain),
"=",
assignment,
)
self.container._add_statement(statement)
self._is_dirty = True
if not self.container.delayed_execution:
self.container._run()
def __eq__(self, other): # type: ignore
return expression.Expression(self, "==", other)
def __neg__(self):
return implicits.ImplicitParameter(
self, name=f"-{self.name}", domain=self._domain
)
@property
def records(self):
"""
Records of the Parameter
Returns
-------
DataFrame
"""
if not self._is_dirty:
return self._records
self.container._run()
return self._records
@records.setter
def records(self, records):
if records is not None:
if not isinstance(records, pd.DataFrame):
raise TypeError("Symbol 'records' must be type DataFrame")
# set records
self._records = records
self._requires_state_check = True
self.modified = True
self.container._requires_state_check = True
self.container.modified = True
if self._records is not None:
if self.domain_forwarding: # pragma: no cover
self._domainForwarding()
# reset state check flags for all symbols in the container
for symbol in self.container.data.values():
symbol._requires_state_check = True
[docs] def gamsRepr(self) -> str:
"""
Representation of this Parameter in GAMS language.
Returns
-------
str
"""
return self.name
def _get_domain_str(self):
set_strs = []
for set in self.domain:
if isinstance(set, (gt.Set, gt.Alias, implicits.ImplicitSet)):
set_strs.append(set.gamsRepr())
elif isinstance(set, str):
set_strs.append("*")
return "(" + ",".join(set_strs) + ")"
[docs] def getStatement(self) -> str:
"""
Statement of the Parameter definition
Returns
-------
str
"""
statement_name = self.name
if self.domain:
statement_name += self._get_domain_str()
output = f"Parameter {statement_name}"
if self.description:
output += ' "' + self.description + '"'
output += ";"
return output
