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join.rb
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join.rb
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module Pacer
module Routes
module RouteOperations
def key(&block)
join(:key, &block)
end
def join(name = nil, options = {}, &block)
args = {
:transform => :join,
element_type: :vertex,
graph: options.fetch(:multi_graph, Pacer::MultiGraph.new),
from_graph: graph
}
args[:existing_multi_graph] = options[:multi_graph] if options[:multi_graph]
route = chain_route(args)
route = route.key { |v| v } unless name == :key
if block and name == :key
route.key &block
elsif block
route.join(name || :values, &block)
else
route
end
end
end
end
module Transform
module Join
class CombinePipe < Pacer::Pipes::RubyPipe
import com.tinkerpop.pipes.sideeffect.SideEffectPipe
import java.util.ArrayList
import java.util.LinkedList
include SideEffectPipe rescue nil # may raise exception on reload.
attr_accessor :multi_graph, :current_keys, :current_values, :join_on
attr_reader :key_names, :keys, :values_pipes, :from_graph
def initialize(from_graph, multi_graph)
super()
@from_graph = from_graph
@multi_graph = multi_graph || Pacer::MultiGraph.new
@values_pipes = []
@current_keys = []
@current_values = []
@key_names = []
@keys = []
end
def addKeyPipe(name, from_pipe, to_pipe)
key_names << name
keys << prepare_aggregate_pipe(from_pipe, to_pipe)
end
def addValuesPipe(name, from_pipe, to_pipe)
values_pipes << [name, *prepare_aggregate_pipe(from_pipe, to_pipe)]
end
def getSideEffect
multi_graph
end
protected
def processNextStart
while true
if current_keys.empty?
element = starts.next
element.graph = from_graph if element.respond_to? :graph
self.current_keys = get_keys(element)
self.current_values = get_values(element) unless current_keys.empty?
else
key = current_keys.removeFirst
if key
combined = multi_graph.send(:getVertex, key) || multi_graph.send(:addVertex, key)
else
combined = multi_graph.send(:addVertex, nil)
end
combined.join_on join_on if join_on
combined[:key] = key
current_values.each do |key, values|
combined.append_property_array key, values
end
return combined
end
end
rescue NativeException => e
if e.cause.getClass == Pacer::NoSuchElementException.getClass
raise e.cause
else
raise e
end
end
def get_keys(element)
array = LinkedList.new
keys.each do |key_expando, key_end|
if key_expando
array.addAll next_results(key_expando, key_end, element)
end
array.add nil if array.empty?
array
end
def get_values(element)
values_pipes.map do |name, expando, to_pipe|
[name, next_results(expando, to_pipe, element)]
end
end
# doesn't need to be spun out because it's a capped aggregator
def next_results(expando, pipe, element)
pipe.reset
expando.add element, ArrayList.new, nil
array = pipe.next
array.each { |element| element.graph = from_graph if element.respond_to? :graph }
array
end
def prepare_aggregate_pipe(from_pipe, to_pipe)
expando = Pacer::Pipes::ExpandablePipe.new
expando.setStarts ArrayList.new.iterator
from_pipe.setStarts(expando)
agg_pipe = com.tinkerpop.pipes.sideeffect.AggregatePipe.new LinkedList.new
cap_pipe = com.tinkerpop.pipes.transform.SideEffectCapPipe.new agg_pipe
agg_pipe.setStarts to_pipe
cap_pipe.setStarts to_pipe
[expando, cap_pipe]
end
end
include Pacer::Core::SideEffect
attr_accessor :existing_multi_graph, :key_route, :values_routes, :from_graph
attr_writer :join_on
def key(name = :key, &block)
self.key_route = Pacer::Route.block_branch(self, block)
self
end
def join(name = nil, &block)
self.key_route = nil if name == :key
if block
values_routes << [(name || :values), Pacer::Route.block_branch(self, block)]
else
values_routes << [(name || :values), Pacer::Route.block_branch(self, proc { |v| v })]
end
self
end
def join_on(*keys)
@join_on = keys
self
end
def multigraph
cap.first
end
protected
def after_initialize
@values_routes = []
end
def attach_pipe(end_pipe)
pipe = CombinePipe.new(from_graph, existing_multi_graph)
self.graph = pipe.multi_graph
pipe.addKeyPipe :key, *key_route.send(:build_pipeline) if key_route
pipe.join_on = @join_on
values_routes.each do |name, route|
pipe.addValuesPipe name, *route.send(:build_pipeline)
end
pipe.setStarts end_pipe if end_pipe
pipe
end
def inspect_string
"#{ inspect_class_name }(#{ key_route.inspect }: #{ Hash[values_routes].inspect })"
end
end
end
end