Class: Resilience::Attribute

Inherits:
Object
  • Object
show all
Includes:
OnImage
Defined in:
lib/resilience/attribute.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from OnImage

#image, image, included, restore_pos, #restore_pos, store_pos, #store_pos

Constructor Details

#initialize(args = {}) ⇒ Attribute

Returns a new instance of Attribute.



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# File 'lib/resilience/attribute.rb', line 12

def initialize(args={})
  @pos   = args[:pos]
  @bytes = args[:bytes]
end

Instance Attribute Details

#bytes ⇒ Object

Returns the value of attribute bytes.



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# File 'lib/resilience/attribute.rb', line 10

def bytes
  @bytes
end

#pos ⇒ Object

Returns the value of attribute pos.



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# File 'lib/resilience/attribute.rb', line 9

def pos
  @pos
end

Class Method Details

.read ⇒ Object 



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# File 'lib/resilience/attribute.rb', line 21

def self.read
  pos = image.pos
  packed = image.read(4)
  return new if packed.nil?
  attr_len = packed.unpack('L').first
  return new if attr_len == 0

  image.seek pos
  value = image.read(attr_len)
  new(:pos => pos, :bytes => value)
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/resilience/attribute.rb', line 37

def [](key)
  return bytes[key]
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/resilience/attribute.rb', line 17

def empty?
  bytes.nil? || bytes.empty?
end

#to_s ⇒ Object 



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# File 'lib/resilience/attribute.rb', line 41

def to_s
  bytes.collect { |a| a.to_s(16) }.join(' ')
end

#unpack(format) ⇒ Object 



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

def unpack(format)
  bytes.unpack(format)
end