Class: RDF::Literal::Numeric

Inherits:
RDF::Literal show all
Defined in:
lib/rdf/model/literal/numeric.rb

Overview

Shared methods and class ancestry for numeric literal classes.

Since:

  • 0.3.0

Direct Known Subclasses

Decimal, Double

Constant Summary

Constants inherited from RDF::Literal

FALSE, TRUE, ZERO

Instance Attribute Summary

Attributes inherited from RDF::Literal

#datatype, #language

Instance Method Summary collapse

Methods inherited from RDF::Literal

#canonicalize!, #compatible?, #comperable_datatype?, datatype_map, datatyped_class, #eql?, #escape, #freeze, #has_datatype?, #has_language?, #hash, #humanize, #initialize, #inspect, #literal?, new, #object, #plain?, #simple?, #to_s, #valid?, #validate!, #value, #value_hash

Methods included from Term

#compatible?, #eql?, #term?, #to_base, #to_term

Methods included from Value

#anonymous?, #canonicalize, #canonicalize!, #constant?, #graph?, #inspect, #inspect!, #invalid?, #iri?, #list?, #literal?, #node?, #resource?, #statement?, #term?, #to_nquads, #to_ntriples, #to_rdf, #to_term, #type_error, #uri?, #valid?, #validate!, #variable?

Constructor Details

This class inherits a constructor from RDF::Literal

Instance Method Details

#*(other) ⇒ RDF::Literal::Numeric

Returns the product of ‘self` times `other`.

Parameters:

Returns:

See Also:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/numeric.rb', line 114

def *(other)
  if self.class == Double || [Double, ::Float].include?(other.class)
    RDF::Literal::Double.new(to_f * other.to_f)
  elsif ((self.class == RDF::Literal::Float || other.class == RDF::Literal::Float) rescue false)
    RDF::Literal::Float.new(to_f * other.to_f)
  elsif self.class == Decimal || other.class == Decimal
    RDF::Literal::Decimal.new(to_d * (other.respond_to?(:to_d) ? other.to_d : BigDecimal(other.to_s)))
  else
    RDF::Literal::Integer.new(to_i * other.to_i)
  end
end

#+(other) ⇒ RDF::Literal::Numeric

Returns the sum of ‘self` plus `other`.

For xs:float or xs:double values, if one of the operands is a zero or a finite number and the other is INF or -INF, INF or -INF is returned. If both operands are INF, INF is returned. If both operands are -INF, -INF is returned. If one of the operands is INF and the other is -INF, NaN is returned.

Parameters:

Returns:

See Also:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/numeric.rb', line 76

def +(other)
  if self.class == Double || [Double, ::Float].include?(other.class)
    RDF::Literal::Double.new(to_f + other.to_f)
  elsif ((self.class == RDF::Literal::Float || other.class == RDF::Literal::Float) rescue false)
    RDF::Literal::Float.new(to_f + other.to_f)
  elsif self.class == Decimal || other.class == Decimal
    RDF::Literal::Decimal.new(to_d + (other.respond_to?(:to_d) ? other.to_d : BigDecimal(other.to_s)))
  else
    RDF::Literal::Integer.new(to_i + other.to_i)
  end
end

#+@ ⇒ RDF::Literal::Numeric

Returns ‘self`.

Returns:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/numeric.rb', line 52

def +@
  self # unary plus
end

#-(other) ⇒ RDF::Literal::Numeric

Returns the difference of ‘self` minus `other`.

Parameters:

Returns:

See Also:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/numeric.rb', line 95

def -(other)
  if self.class == Double || [Double, ::Float].include?(other.class)
    RDF::Literal::Double.new(to_f - other.to_f)
  elsif ((self.class == RDF::Literal::Float || other.class == RDF::Literal::Float) rescue false)
    RDF::Literal::Float.new(to_f - other.to_f)
  elsif self.class == Decimal || other.class == Decimal
    RDF::Literal::Decimal.new(to_d - (other.respond_to?(:to_d) ? other.to_d : BigDecimal(other.to_s)))
  else
    RDF::Literal::Integer.new(to_i - other.to_i)
  end
end

#-@ ⇒ RDF::Literal::Numeric

Returns ‘self` negated.

Returns:

Since:

  • 0.2.3



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

def -@
  self.class.new(-self.object)
end

#/(other) ⇒ RDF::Literal::Numeric

Returns the quotient of ‘self` divided by `other`.

As a special case, if the types of both $arg1 and $arg2 are xsd:integer, then the return type is xsd:decimal.

Parameters:

Returns:

Raises:

  • (ZeroDivisionError) —

    if divided by zero

See Also:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/numeric.rb', line 137

def /(other)
  if self.class == Double || [Double, ::Float].include?(other.class)
    RDF::Literal::Double.new(to_f / other.to_f)
  elsif ((self.class == RDF::Literal::Float || other.class == RDF::Literal::Float) rescue false)
    RDF::Literal::Float.new(to_f / other.to_f)
  else
    RDF::Literal::Decimal.new(to_d / (other.respond_to?(:to_d) ? other.to_d : BigDecimal(other.to_s)))
  end
end

#<=>(other) ⇒ Integer

Compares this literal to ‘other` for sorting purposes.

Parameters:

  • other (Object)

Returns:

  • (Integer) —

    ‘-1`, `0`, or `1`

Since:

  • 0.3.0



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# File 'lib/rdf/model/literal/numeric.rb', line 13

def <=>(other)
  case other
    when ::Numeric
      to_d <=> other
    when Double
      to_f <=> other.to_f
    when Numeric
      to_d <=> other.to_d
    else super
  end
end

#==(other) ⇒ Boolean

Returns ‘true` if this literal is equal to `other`.

Parameters:

  • other (Object)

Returns:

  • (Boolean) —

    ‘true` or `false`

Since:

  • 0.3.0



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# File 'lib/rdf/model/literal/numeric.rb', line 31

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

  case other
  when Literal::Numeric
    return super unless other.valid?
    (cmp = (self <=> other)) ? cmp.zero? : false
  when RDF::URI, RDF::Node
    # Interpreting SPARQL data-r2/expr-equal/eq-2-2, numeric can't be compared with other types
    type_error("unable to determine whether #{self.inspect} and #{other.inspect} are equivalent")
  else
    super
  end
end

#abs ⇒ RDF::Literal

Returns the absolute value of ‘self`.

Returns:

Raises:

  • (NotImplementedError) —

    unless implemented in subclass

Since:

  • 0.3.0



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# File 'lib/rdf/model/literal/numeric.rb', line 152

def abs
  raise NotImplementedError
end

#ceil ⇒ RDF::Literal

Returns the smallest integer greater than or equal to ‘self`.

Examples:

RDF::Literal(1).ceil            #=> RDF::Literal(1)

Returns:

Since:

  • 0.3.0



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# File 'lib/rdf/model/literal/numeric.rb', line 172

def ceil
  self
end

#floor ⇒ RDF::Literal

Returns the largest integer less than or equal to ‘self`.

Examples:

RDF::Literal(1).floor            #=> RDF::Literal(1)

Returns:

Since:

  • 0.3.0



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# File 'lib/rdf/model/literal/numeric.rb', line 183

def floor
  self
end

#round ⇒ RDF::Literal

Returns the number with no fractional part that is closest to the argument. If there are two such numbers, then the one that is closest to positive infinity is returned. An error is raised if arg is not a numeric value.

Returns:

Raises:

  • (NotImplementedError) —

    unless implemented in subclass

Since:

  • 0.3.0



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# File 'lib/rdf/model/literal/numeric.rb', line 161

def round
  raise NotImplementedError
end

#to_d ⇒ BigDecimal

Returns the value as a decimal number.

Returns:

  • (BigDecimal)

Since:

  • 0.3.0



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# File 'lib/rdf/model/literal/numeric.rb', line 212

def to_d
  @object.respond_to?(:to_d) ? @object.to_d : BigDecimal(@object.to_s)
rescue FloatDomainError
  ::Float::NAN
end

#to_f ⇒ Float

Returns the value as a floating point number.

The usual accuracy limits and errors of binary float arithmetic apply.

Returns:

  • (Float)

See Also:

  • BigDecimal#to_f

Since:

  • 0.3.0



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# File 'lib/rdf/model/literal/numeric.rb', line 204

def to_f
  @object.to_f
end

#to_i ⇒ Integer Also known as: to_int, ord

Returns the value as an integer.

Returns:

Since:

  • 0.3.0



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# File 'lib/rdf/model/literal/numeric.rb', line 191

def to_i
  @object.to_i
end

#to_r ⇒ Rational

Returns the value as a rational number.

Returns:

  • (Rational)

Since:

  • 0.3.0



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# File 'lib/rdf/model/literal/numeric.rb', line 222

def to_r
  @object.to_r
end