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91 lines
2.4 KiB
Python
91 lines
2.4 KiB
Python
from ..helpers import quote_string
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from .node import Node
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class Edge:
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"""
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An edge connecting two nodes.
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"""
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def __init__(self, src_node, relation, dest_node, edge_id=None, properties=None):
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"""
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Create a new edge.
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"""
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if src_node is None or dest_node is None:
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# NOTE(bors-42): It makes sense to change AssertionError to
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# ValueError here
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raise AssertionError("Both src_node & dest_node must be provided")
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self.id = edge_id
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self.relation = relation or ""
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self.properties = properties or {}
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self.src_node = src_node
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self.dest_node = dest_node
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def to_string(self):
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res = ""
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if self.properties:
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props = ",".join(
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key + ":" + str(quote_string(val))
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for key, val in sorted(self.properties.items())
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)
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res += "{" + props + "}"
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return res
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def __str__(self):
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# Source node.
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if isinstance(self.src_node, Node):
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res = str(self.src_node)
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else:
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res = "()"
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# Edge
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res += "-["
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if self.relation:
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res += ":" + self.relation
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if self.properties:
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props = ",".join(
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key + ":" + str(quote_string(val))
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for key, val in sorted(self.properties.items())
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)
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res += "{" + props + "}"
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res += "]->"
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# Dest node.
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if isinstance(self.dest_node, Node):
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res += str(self.dest_node)
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else:
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res += "()"
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return res
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def __eq__(self, rhs):
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# Type checking
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if not isinstance(rhs, Edge):
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return False
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# Quick positive check, if both IDs are set.
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if self.id is not None and rhs.id is not None and self.id == rhs.id:
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return True
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# Source and destination nodes should match.
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if self.src_node != rhs.src_node:
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return False
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if self.dest_node != rhs.dest_node:
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return False
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# Relation should match.
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if self.relation != rhs.relation:
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return False
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# Quick check for number of properties.
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if len(self.properties) != len(rhs.properties):
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return False
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# Compare properties.
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if self.properties != rhs.properties:
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return False
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return True
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