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Contents
module Neo4j
module Wrapper
module Rule
module Functions
# A function for counting number of nodes of a given class.
class Size < Function
def initialize
@property = '_classname'
@@lock ||= Java::java.lang.Object.new
end
def calculate?(changed_property)
true
end
def delete(rule_name, rule_node, _)
key = rule_node_property(rule_name)
rule_node[key] ||= 0
rule_node[key] -= 1
end
def add(rule_name, rule_node, _)
key = rule_node_property(rule_name)
rule_node[key] ||= 0
rule_node[key] += 1
end
def update(*)
# we are only counting, not interested in property changes
end
def classes_changed(rule_name, rule_node, class_change)
key = rule_node_property(rule_name)
@@lock.synchronized do
rule_node[key] ||= 0
rule_node[key] += class_change.net_change
end
end
def self.function_name
:size
end
end
end
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems