Class: FakeDynamo::Attribute

Inherits:
Object
  • Object
show all
Defined in:
lib/fake_dynamo/attribute.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, value, type) ⇒ Attribute

Returns a new instance of Attribute.



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# File 'lib/fake_dynamo/attribute.rb', line 5

def initialize(name, value, type)
  @name, @type = name, type
  validate_name!
  return unless value

  @value = decode(value)
  validate_value!
end

Instance Attribute Details

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/fake_dynamo/attribute.rb', line 3

def name
  @name
end

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/fake_dynamo/attribute.rb', line 3

def type
  @type
end

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/fake_dynamo/attribute.rb', line 3

def value
  @value
end

Class Method Details

.from_data(data) ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 85

def from_data(data)
  Attribute.new(data['AttributeName'], nil, data['AttributeType'])
end

.from_hash(name, hash) ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 89

def from_hash(name, hash)
  Attribute.new(name, hash.values.first, hash.keys.first)
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 70

def <=>(other)
  @value <=> other.value
end

#==(attribute) ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 64

def ==(attribute)
  @name == attribute.name &&
    @type == attribute.type &&
    @value == attribute.value
end

#as_hash ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 60

def as_hash
  { @name => { @type => encode(@value) } }
end

#decode(value) ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 40

def decode(value)
  case @type
  when 'B' then Base64.strict_decode64(value)
  when 'BS' then value.map { |v| Base64.strict_decode64(v) }
  when 'N' then Num.new(value)
  when 'NS' then value.map { |v| Num.new(v) }
  else value
  end
end

#description ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 33

def description
  {
    'AttributeName' => name,
    'AttributeType' => type
  }
end

#encode(value) ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 50

def encode(value)
  case @type
  when 'B' then Base64.strict_encode64(value)
  when 'BS' then value.map { |v| Base64.strict_encode64(v) }
  when 'N' then value.to_s
  when 'NS' then value.map(&:to_s)
  else value
  end
end

#eql?(attribute) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fake_dynamo/attribute.rb', line 74

def eql?(attribute)
  return false unless attribute.kind_of? Attribute

  self == attribute
end

#hash ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 80

def hash
  name.hash ^ value.hash ^ type.hash
end

#validate_name! ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 14

def validate_name!
  if name == ''
    raise ValidationException, 'Empty attribute name'
  end
end

#validate_value! ⇒ Object 



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# File 'lib/fake_dynamo/attribute.rb', line 20

def validate_value!
  if ['NS', 'SS', 'BS'].include? @type
    raise ValidationException, 'An AttributeValue may not contain an empty set' if @value.empty?
    raise ValidationException, 'Input collection contains duplicates' if value.uniq!
  end

  if ['S', 'SS', 'S', 'BS'].include? @type
    Array(@value).each do |v|
      raise ValidationException, 'An AttributeValue may not contain an empty string or empty binary' if v == ''
    end
  end
end