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"""
altgraph.ObjectGraph - Graph of objects with an identifier
==========================================================
A graph of objects that have a "graphident" attribute.
graphident is the key for the object in the graph
"""
from altgraph import GraphError
from altgraph.Graph import Graph
from altgraph.GraphUtil import filter_stack
class ObjectGraph(object):
"""
A graph of objects that have a "graphident" attribute.
graphident is the key for the object in the graph
"""
def __init__(self, graph=None, debug=0):
if graph is None:
graph = Graph()
self.graphident = self
self.graph = graph
self.debug = debug
self.indent = 0
graph.add_node(self, None)
def __repr__(self):
return '<%s>' % (type(self).__name__,)
def flatten(self, condition=None, start=None):
"""
Iterate over the subgraph that is entirely reachable by condition
starting from the given start node or the ObjectGraph root
"""
if start is None:
start = self
start = self.getRawIdent(start)
return self.graph.iterdata(start=start, condition=condition)
def nodes(self):
for ident in self.graph:
node = self.graph.node_data(ident)
if node is not None:
yield self.graph.node_data(ident)
def get_edges(self, node):
start = self.getRawIdent(node)
_, _, outraw, incraw = self.graph.describe_node(start)
def iter_edges(lst, n):
seen = set()
for tpl in (self.graph.describe_edge(e) for e in lst):
ident = tpl[n]
if ident not in seen:
yield self.findNode(ident)
seen.add(ident)
return iter_edges(outraw, 3), iter_edges(incraw, 2)
def edgeData(self, fromNode, toNode):
start = self.getRawIdent(fromNode)
stop = self.getRawIdent(toNode)
edge = self.graph.edge_by_node(start, stop)
return self.graph.edge_data(edge)
def updateEdgeData(self, fromNode, toNode, edgeData):
start = self.getRawIdent(fromNode)
stop = self.getRawIdent(toNode)
edge = self.graph.edge_by_node(start, stop)
self.graph.update_edge_data(edge, edgeData)
def filterStack(self, filters):
"""
Filter the ObjectGraph in-place by removing all edges to nodes that
do not match every filter in the given filter list
Returns a tuple containing the number of: (nodes_visited, nodes_removed, nodes_orphaned)
"""
visited, removes, orphans = filter_stack(self.graph, self, filters)
for last_good, tail in orphans:
self.graph.add_edge(last_good, tail, edge_data='orphan')
for node in removes:
self.graph.hide_node(node)
return len(visited)-1, len(removes), len(orphans)
def removeNode(self, node):
"""
Remove the given node from the graph if it exists
"""
ident = self.getIdent(node)
if ident is not None:
self.graph.hide_node(ident)
def removeReference(self, fromnode, tonode):
"""
Remove all edges from fromnode to tonode
"""
if fromnode is None:
fromnode = self
fromident = self.getIdent(fromnode)
toident = self.getIdent(tonode)
if fromident is not None and toident is not None:
while True:
edge = self.graph.edge_by_node(fromident, toident)
if edge is None:
break
self.graph.hide_edge(edge)
def getIdent(self, node):
"""
Get the graph identifier for a node
"""
ident = self.getRawIdent(node)
if ident is not None:
return ident
node = self.findNode(node)
if node is None:
return None
return node.graphident
def getRawIdent(self, node):
"""
Get the identifier for a node object
"""
if node is self:
return node
ident = getattr(node, 'graphident', None)
return ident
def __contains__(self, node):
return self.findNode(node) is not None
def findNode(self, node):
"""
Find the node on the graph
"""
ident = self.getRawIdent(node)
if ident is None:
ident = node
try:
return self.graph.node_data(ident)
except KeyError:
return None
def addNode(self, node):
"""
Add a node to the graph referenced by the root
"""
self.msg(4, "addNode", node)
try:
self.graph.restore_node(node.graphident)
except GraphError:
self.graph.add_node(node.graphident, node)
def createReference(self, fromnode, tonode, edge_data=None):
"""
Create a reference from fromnode to tonode
"""
if fromnode is None:
fromnode = self
fromident, toident = self.getIdent(fromnode), self.getIdent(tonode)
if fromident is None or toident is None:
return
self.msg(4, "createReference", fromnode, tonode, edge_data)
self.graph.add_edge(fromident, toident, edge_data=edge_data)
def createNode(self, cls, name, *args, **kw):
"""
Add a node of type cls to the graph if it does not already exist
by the given name
"""
m = self.findNode(name)
if m is None:
m = cls(name, *args, **kw)
self.addNode(m)
return m
def msg(self, level, s, *args):
"""
Print a debug message with the given level
"""
if s and level <= self.debug:
print ("%s%s %s" % (" " * self.indent, s, ' '.join(map(repr, args))))
def msgin(self, level, s, *args):
"""
Print a debug message and indent
"""
if level <= self.debug:
self.msg(level, s, *args)
self.indent = self.indent + 1
def msgout(self, level, s, *args):
"""
Dedent and print a debug message
"""
if level <= self.debug:
self.indent = self.indent - 1
self.msg(level, s, *args)
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