#
# GAMS - General Algebraic Modeling System Python API
#
# Copyright (c) 2017-2024 GAMS Development Corp. <support@gams.com>
# Copyright (c) 2017-2024 GAMS Software GmbH <support@gams.com>
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# SOFTWARE.
#
import pandas as pd
from gams.core import gdx
from gams.transfer._abcs import ABCUniverseAlias, ABCAlias, AnyContainerSymbol
from gams.transfer.syms._mixins import SAUAMixin, SAUAPVEMixin
from typing import Union, List, TYPE_CHECKING
if TYPE_CHECKING:
from gams.transfer import Container, Set, Alias
class UniverseAlias(SAUAMixin, SAUAPVEMixin, ABCUniverseAlias):
"""
Universe Alias symbol
Parameters
----------
container : Container
name : str
Examples
--------
>>> import gams.transfer as gt
>>> m = gt.Container()
>>> i = gt.Set(m, "i", records=["seattle", "san-diego"])
>>> j = gt.Set(m, "j", records=["new-york", "chicago", "topeka"])
>>> ij = gt.UniverseAlias(m, "ij")
>>> print(ij.toList())
['seattle', 'san-diego', 'new-york', 'chicago', 'topeka']
Attributes
----------
alias_with : str
Aliased object
container : Container object
Container where the symbol exists
description : str
description of symbol
dimension : int
The dimension of symbol
domain : List[str]
List of domains given as string (* for universe set)
domain_labels : List[str]
The column headings for the records DataFrame
domain_names : List[str]
String version of domain names
domain_type : str
The state of domain links
is_singleton : bool
Flag that identifies if the the alias is singleton
modified : bool
Flag that identifies if the symbol has been modified
name : str
Name of the symbol
number_records : int
The number of symbol records
records : DataFrame
The main symbol records
summary : dict
A dict of only the metadata
"""
@classmethod
def _from_gams(cls, container, name):
# create new symbol object
obj = UniverseAlias.__new__(cls)
# set private properties directly
obj._requires_state_check = False
obj._container = container
container._requires_state_check = True
obj._name = name
obj._modified = True
# typing
obj._gams_type = gdx.GMS_DT_ALIAS
obj._gams_subtype = 0
# add to container
container.data.update({name: obj})
return obj
def __new__(cls, *args, **kwargs):
if len(args) == 0:
return object.__new__(UniverseAlias)
try:
symobj = args[0][args[1]]
except:
symobj = None
if symobj is None:
return object.__new__(UniverseAlias)
else:
if isinstance(symobj, ABCUniverseAlias):
return symobj
else:
raise TypeError(
f"Cannot overwrite symbol `{symobj.name}` in container because it is not a UniverseAlias object)"
)
def __init__(self, container: "Container", name: str) -> None:
self._requires_state_check = True
self.container = container
self.name = name
self.modified = True
self._gams_type = gdx.GMS_DT_ALIAS
self._gams_subtype = 0
container.data.update({name: self})
def __delitem__(self):
# TODO: add in some functionality that might relax the symbols down to a different domain
# This function would mimic the <Container>.removeSymbols() method -- is more pythonic
del self.container.data[self.name]
def __repr__(self):
return f"<UniverseAlias `{self.name}` ({hex(id(self))})>"
@property
def is_singleton(self) -> bool:
"""
Whether a symbol is a singleton set
Returns
-------
bool
Always False
"""
return False
def _assert_is_valid(self):
if self._requires_state_check:
if self.container is None:
raise Exception(
"Symbol is not currently linked to a container, "
"must add it to a container in order to be valid"
)
# if no exceptions, then turn self._requires_state_check 'off'
self._requires_state_check = False
@property
def alias_with(self) -> str:
"""
Returns aliased object
Returns
-------
str
Always "*"
"""
return "*"
@property
def domain_names(self) -> List[str]:
"""
Always ["*"] for universe alias
Returns
-------
List[str]
Always ["*"]
"""
return ["*"]
@property
def domain_labels(self) -> List[str]:
"""
Always ["uni"] for universe alias
Returns
-------
List[str]
Always ["uni"]
"""
return ["uni"]
@property
def domain(self) -> List[str]:
"""
Always ["*"] for universe alias
Returns
-------
List[str]
Always ["*"]
"""
return ["*"]
@property
def description(self) -> str:
"""
Always 'Aliased with *' for universe alias
Returns
-------
str
Always 'Aliased with *'
"""
return "Aliased with *"
@property
def dimension(self) -> int:
"""
Always 1 for universe alias
Returns
-------
int
Always 1
"""
return 1
[docs] def toList(self) -> Union[List[str], None]:
"""
Convenience method to return symbol records as a python list
Returns
-------
List[str] | None
A list of symbol records
Examples
--------
>>> m = gt.Container()
>>> i = gt.Set(m, "i", records=["seattle", "san-diego"])
>>> j = gt.Set(m, "j", records=["new-york", "chicago", "topeka"])
>>> ij = gt.UniverseAlias(m, "ij")
>>> print(ij.toList())
['seattle', 'san-diego', 'new-york', 'chicago', 'topeka']
"""
if self.records is not None:
return self.records.set_index(self.records.columns[0]).index.to_list()
return None
@property
def records(self) -> Union[pd.DataFrame, None]:
"""
The main symbol records
Returns
-------
DataFrame | None
Records dataframe if there are records, otherwise None.
"""
if self.isValid():
return pd.DataFrame(
data=self.container.getUELs(), columns=self.domain_labels
)
return None
@property
def number_records(self) -> Union[int]:
"""
Number of symbol records (i.e., returns len(records) if not NAN)
Returns
-------
int
Number of symbol records
"""
if self.isValid():
return len(self.records)
return float("nan")
@property
def domain_type(self) -> str:
"""
Always none for universe alias
Returns
-------
str
Always 'none'
"""
return "none"
[docs] def getUELs(self, ignore_unused: bool = False) -> Union[List[str], None]:
"""
Gets UELs from the Container. Returns only UELs in the data if ignore_unused=True, otherwise return all UELs.
Parameters
----------
ignore_unused : bool, optional
Whether to get all UELs or only used ones, by default False
Returns
-------
list | None
A list of UELs if the symbol is valid, otherwise None.
"""
if self.isValid():
return self.container.getUELs(ignore_unused=ignore_unused)
return None
@property
def summary(self) -> dict:
"""
Returns a dict of only the metadata
Returns
-------
dict
Outputs a dict of only the metadata
"""
return {
"name": self.name,
"description": self.description,
"alias_with": self.alias_with,
}
[docs] def equals(
self,
other: Union["Set", "Alias"],
check_meta_data: bool = True,
verbose: bool = False,
):
"""
Used to compare the symbol to another symbol.
If check_meta_data=True then check that symbol name and description are the same, otherwise skip.
If verbose=True will return an exception from the asserter describing the nature of the difference.
Parameters
----------
other : Set or Alias
The other symbol (Set or Alias) to compare with the current alias.
check_meta_data : bool, optional
If True, compare the metadata of the two symbols, by default True.
verbose : bool, optional
If True, raise an exception with an explanation of where the symbols differ if they do differ, by default False.
Returns
-------
bool
True if the two symbols are equal in the specified aspects; False if they are not equal and verbose is False.
Examples
--------
>>> m = gt.Container()
>>> i = gt.Set(m, "i", records=["seattle", "san-diego"])
>>> j = gt.Set(m, "j", records=["new-york", "chicago", "topeka"])
>>> ij = gt.UniverseAlias(m, "ij")
>>> print(ij.equals(i))
False
"""
try:
#
# ARG: other
if not isinstance(other, AnyContainerSymbol):
raise TypeError(
"Argument 'other' must be a GAMS Container Symbol object"
)
# adjustments
if isinstance(other, ABCAlias):
other = other.alias_with
#
# ARG: self & other
if not isinstance(self, type(other)):
raise TypeError(
f"Symbol are not of the same type (`{type(self)}` != `{type(other)}`)"
)
#
# ARG: check_meta_data
if not isinstance(check_meta_data, bool):
raise TypeError("Argument 'check_meta_data' must be type bool")
#
# Mandatory checks
if not self.isValid():
raise Exception(
f"Cannot compare objects because `{self.name}` is not a valid symbol object"
"Use `<symbol>.isValid(verbose=True)` to debug further."
)
if not other.isValid():
raise Exception(
f"Cannot compare objects because `{other.name}` is not a valid symbol object"
"Use `<symbol>.isValid(verbose=True)` to debug further."
)
#
# Check metadata (optional)
if check_meta_data:
if self.name != other.name:
raise Exception(
f"Symbol names do not match (`{self.name}` != `{other.name}`)"
)
return True
except Exception as err:
if verbose:
raise err
else:
return False
[docs] def pivot(self, *args, **kwargs) -> None:
"""
Pivot the records DataFrame of a symbol that has a dimension more than 1.
Always raises a dimensionality exception.
"""
raise Exception(
"Pivoting operations only possible on symbols with dimension > 1, "
f"symbol dimension is {self.dimension}"
)
[docs] def getSparsity(self) -> float:
"""
Get the sparsity of the symbol w.r.t the cardinality
Returns
-------
float
Always 0
"""
return 0.0
