Class: Neo4j::Embedded::EmbeddedLabel

Inherits:

Label

• Object
• Label
• Neo4j::Embedded::EmbeddedLabel

show all

Extended by:

Core::TxMethods

Defined in:

lib/neo4j-embedded/embedded_label.rb

Constant Summary

JAVA_CLASS =

Java::OrgNeo4jGraphdb::DynamicLabel

Constants included from Core::CypherTranslator

Core::CypherTranslator::EMPTY_PROPS, Core::CypherTranslator::SANITIZE_ESCAPED_REGEXP

Instance Attribute Summary (collapse)

• - (Object) name readonly

  Returns the value of attribute name.

Class Method Summary (collapse)

• + (Object) as_java(labels)

Instance Method Summary (collapse)

• - (Object) _find_nodes(key = nil, value = nil)
• - (Object) as_java
• - (Object) create_index(*properties)
• - (Object) drop_index(*properties)
• - (Object) find_nodes(key = nil, value = nil)
• - (Object) indexes
• - (EmbeddedLabel) initialize(session, name) constructor

  A new instance of EmbeddedLabel.

• - (Object) to_s
• - (Object) uniqueness_constraints

Methods included from Core::TxMethods

tx_methods

Methods inherited from Label

create, #create_constraint, #drop_constraint, find_all_nodes, find_nodes

Methods included from Core::CypherTranslator

#create_escape_value, #cypher_prop_list, #cypher_string, #escape_quotes, #escape_value, #label_string, #prop_identifier, #sanitize_escape_sequences, sanitized_column_names, translate_response

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# File 'lib/neo4j-embedded/embedded_label.rb', line 8

def initialize(session, name)
  @name = name.to_sym
  @session = session
end

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# File 'lib/neo4j-embedded/embedded_label.rb', line 5

def name
  @name
end

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# File 'lib/neo4j-embedded/embedded_label.rb', line 75

def as_java(labels)
  if labels.is_a?(Array)
    return nil if labels.empty?
    labels.inject([]) { |result, label| result << JAVA_CLASS.label(label.to_s) }.to_java(JAVA_CLASS)
  else
    JAVA_CLASS.label(labels.to_s)
  end
end

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# File 'lib/neo4j-embedded/embedded_label.rb', line 25

def _find_nodes(key = nil, value = nil)
  if key
    @session.graph_db.find_nodes_by_label_and_property(as_java, key, value).iterator
  else
    ggo = Java::OrgNeo4jTooling::GlobalGraphOperations.at(@session.graph_db)
    ggo.getAllNodesWithLabel(as_java).iterator
  end
end

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# File 'lib/neo4j-embedded/embedded_label.rb', line 34

def as_java
  self.class.as_java(@name.to_s)
end

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# File 'lib/neo4j-embedded/embedded_label.rb', line 38

def create_index(*properties)
  index_creator = @session.graph_db.schema.index_for(as_java)
  # we can also use the PropertyConstraintCreator here
  properties.inject(index_creator) { |creator, key| creator.on(key.to_s) }.create
end

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# File 'lib/neo4j-embedded/embedded_label.rb', line 65

def drop_index(*properties)
  @session.graph_db.schema.indexes(as_java).each do |index_def|
    # at least one match, TODO
    keys = index_def.property_keys.map(&:to_sym)
    index_def.drop if (properties - keys).count < properties.count
  end
end

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# File 'lib/neo4j-embedded/embedded_label.rb', line 17

def find_nodes(key = nil, value = nil)
  iterator = _find_nodes(key, value)
  iterator.to_a.map(&:wrapper)
ensure
  iterator && iterator.close
end

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# File 'lib/neo4j-embedded/embedded_label.rb', line 45

def indexes
  {
    property_keys: @session.graph_db.schema.indexes(as_java).map do |index_def|
      index_def.property_keys.map(&:to_sym)
    end
  }
end

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# File 'lib/neo4j-embedded/embedded_label.rb', line 13

def to_s
  @name
end

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# File 'lib/neo4j-embedded/embedded_label.rb', line 54

def uniqueness_constraints
  definitions = @session.graph_db.schema.constraints(as_java).select do |index_def|
    index_def.is_a?(Java::OrgNeo4jKernelImplCoreapiSchema::PropertyUniqueConstraintDefinition)
  end
  {
    property_keys: definitions.map { |index_def| index_def.property_keys.map(&:to_sym) }
  }
end