Source code for bmtk.builder.node_pool
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from ast import literal_eval
from six import string_types
[docs]class NodePool(object):
"""Stores a collection of nodes based off some query of the network.
Returns the results of a query of nodes from a network using the nodes() method. Nodes are still generated and
saved by the network, this just stores the query information and provides iterator methods for accessing different
nodes.
TODO:
* Implement a collection-set algebra including | and not operators. ie.
nodes = net.nodes(type=1) | net.nodes(type=2)
* Implement operators on properties
nodes = net.nodes(val) > 100
nodes = 100 in net.nodes(val)
"""
def __init__(self, network, **properties):
self.__network = network
self.__properties = properties
self.__filter_str = None
def __len__(self):
return sum(1 for _ in self)
def __iter__(self):
return (n for n in self.__network.nodes_iter() if self.__query_object_properties(n, self.__properties))
@property
def network(self):
return self.__network
@property
def network_name(self):
return self.__network.name
@property
def filter_str(self):
if self.__filter_str is None:
if len(self.__properties) == 0:
self.__filter_str = '*'
else:
self.__filter_str = ''
for k, v in self.__properties.items():
conditional = "{}=='{}'".format(k, v)
self.__filter_str += conditional + '&'
if self.__filter_str.endswith('&'):
self.__filter_str = self.__filter_str[0:-1]
return self.__filter_str
[docs] @classmethod
def from_filter(cls, network, filter_str):
assert(isinstance(filter_str, string_types))
if len(filter_str) == 0 or filter_str == '*':
return cls(network, position=None)
properties = {}
for condtional in filter_str.split('&'):
var, val = condtional.split('==')
properties[var] = literal_eval(val)
return cls(network, position=None, **properties)
def __query_object_properties(self, obj, props):
if props is None:
return True
for k, v in props.items():
ov = obj.get(k, None)
if ov is None:
return False
if hasattr(v, '__call__'):
if not v(ov):
return False
elif isinstance(v, list):
if ov not in v:
return False
elif ov != v:
return False
return True