Class: RDF::Literal::Boolean

Inherits:

RDF::Literal

• Object
• RDF::Literal
• RDF::Literal::Boolean

show all

Defined in:

lib/rdf/model/literal/boolean.rb

Overview

Constant Summary

DATATYPE =

Since:

• 0.2.1

XSD.boolean

GRAMMAR =

Since:

• 0.2.1

/^(true|false|1|0)$/i.freeze

TRUES =

Since:

• 0.2.1

%w(true  1).freeze

FALSES =

Since:

• 0.2.1

%w(false 0).freeze

Constants inherited from RDF::Literal

FALSE, TRUE, ZERO

Instance Attribute Summary

Attributes inherited from RDF::Literal

#datatype, #language

Instance Method Summary (collapse)

• - (Integer) <=>(other)

  Compares this literal to other for sorting purposes.

• - (Boolean) ==(other)

  Returns true if this literal is equivalent to other.

• - (RDF::Literal) canonicalize!

  Converts this literal into its canonical lexical representation.

• - (Boolean) false?

  Returns true if this value is false.

• - (Boolean) initialize(value, options = {}) constructor

  A new instance of Boolean.

• - (String) inspect

  Returns a developer-friendly representation of self.

• - (Integer) to_i

  Returns the value as an integer.

• - (String) to_s

  Returns the value as a string.

• - (Boolean) true?

  Returns true if this value is true.

Methods inherited from RDF::Literal

#anonymous?, #canonicalize, #comperable_datatype?, #eql?, #has_datatype?, #has_language?, #hash, #invalid?, #literal?, #object, #plain?, #valid?, #validate!, #value

Methods included from Term

#constant?, #eql?, #variable?

Methods included from Value

#graph?, #inspect!, #iri?, #literal?, #node?, #resource?, #statement?, #to_ntriples, #to_quad, #to_rdf, #type_error, #uri?, #variable?

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# File 'lib/rdf/model/literal/boolean.rb', line 16

def initialize(value, options = {})
  @datatype = RDF::URI(options[:datatype] || self.class.const_get(:DATATYPE))
  @string   = options[:lexical] if options.has_key?(:lexical)
  @string   ||= value if value.is_a?(String)
  @object   = case
    when true.equal?(value)  then true
    when false.equal?(value) then false
    when TRUES.include?(value.to_s.downcase)  then true
    when FALSES.include?(value.to_s.downcase) then false
    else value
  end
end

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# File 'lib/rdf/model/literal/boolean.rb', line 45

def <=>(other)
  case other
    when TrueClass, FalseClass
      to_i <=> (other ? 1 : 0)
    when RDF::Literal::Boolean
      to_i <=> other.to_i
    else super
  end
end

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# File 'lib/rdf/model/literal/boolean.rb', line 61

def ==(other)
  # If lexically invalid, use regular literal testing
  return super unless self.valid?

  other = Literal::Boolean.new(other) if other.class == TrueClass || other.class == FalseClass

  case other
  when Literal::Boolean
    return super unless other.valid?
    (cmp = (self <=> other)) ? cmp.zero? : false
  else
    super
  end
end

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# File 'lib/rdf/model/literal/boolean.rb', line 34

def canonicalize!
  @string = (@object ? :true : :false).to_s
  self
end

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# File 'lib/rdf/model/literal/boolean.rb', line 105

def false?
  @object.equal?(false)
end

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# File 'lib/rdf/model/literal/boolean.rb', line 113

def inspect
  case
    when self.equal?(RDF::Literal::TRUE)  then 'RDF::Literal::TRUE'
    when self.equal?(RDF::Literal::FALSE) then 'RDF::Literal::FALSE'
    else super
  end
end

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# File 'lib/rdf/model/literal/boolean.rb', line 89

def to_i
  @object ? 1 : 0
end

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# File 'lib/rdf/model/literal/boolean.rb', line 80

def to_s
  @string || @object.to_s
end

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# File 'lib/rdf/model/literal/boolean.rb', line 97

def true?
  @object.equal?(true)
end