Class: Neo4j::Core::Traversal::Evaluator

Inherits:
Object
  • Object
show all
Includes:
Java::OrgNeo4jGraphdbTraversal::Evaluator
Defined in:
lib/neo4j-core/traversal/evaluator.rb

Overview

Implements the Neo4j Evaluator Java interface, only used internally.

Instance Method Summary collapse

Constructor Details

#initialize(&eval_block) ⇒ Evaluator

Returns a new instance of Evaluator.



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# File 'lib/neo4j-core/traversal/evaluator.rb', line 10

def initialize(&eval_block)
  @eval_block = eval_block
end

Instance Method Details

#evaluate(path) ⇒ Object

Implements the Java Interface:

evaluate(Path path)
Evaluates a Path and returns an Evaluation containing information about whether or not to include it in the traversal result, i.e return it from the Traverser.



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# File 'lib/neo4j-core/traversal/evaluator.rb', line 17

def evaluate(path)
  ret = @eval_block.call(path)
  case ret
    when :exclude_and_continue then
      Java::OrgNeo4jGraphdbTraversal::Evaluation::EXCLUDE_AND_CONTINUE
    when :exclude_and_prune then
      Java::OrgNeo4jGraphdbTraversal::Evaluation::EXCLUDE_AND_PRUNE
    when :include_and_continue then
      Java::OrgNeo4jGraphdbTraversal::Evaluation::INCLUDE_AND_CONTINUE
    when :include_and_prune then
      Java::OrgNeo4jGraphdbTraversal::Evaluation::INCLUDE_AND_PRUNE
    else
      raise "Got #{ret}, only accept :exclude_and_continue,:exclude_and_prune,:include_and_continue and :include_and_prune"
  end
end