Class: ThinpXML::Builder

Inherits:
Object
  • Object
show all
Defined in:
lib/thinp_xml/thinp/builder.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Builder

Returns a new instance of Builder.



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# File 'lib/thinp_xml/thinp/builder.rb', line 9

def initialize
  @uuid = ''
  @nr_thins = 0
  @nr_mappings = 0
  @block_size = 128
end

Instance Attribute Details

#block_size ⇒ Object

Returns the value of attribute block_size.



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# File 'lib/thinp_xml/thinp/builder.rb', line 7

def block_size
  @block_size
end

#nr_mappings ⇒ Object

Returns the value of attribute nr_mappings.



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# File 'lib/thinp_xml/thinp/builder.rb', line 7

def nr_mappings
  @nr_mappings
end

#nr_thins ⇒ Object

Returns the value of attribute nr_thins.



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# File 'lib/thinp_xml/thinp/builder.rb', line 7

def nr_thins
  @nr_thins
end

#uuid ⇒ Object

Returns the value of attribute uuid.



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# File 'lib/thinp_xml/thinp/builder.rb', line 7

def uuid
  @uuid
end

Instance Method Details

#generate ⇒ Object 



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# File 'lib/thinp_xml/thinp/builder.rb', line 16

def generate
  nr_thins = @nr_thins.to_i

  mapping_counts = (0..nr_thins - 1).map {|n| @nr_mappings.to_i}
  nr_data_blocks = mapping_counts.inject(0) {|n, tot| n + tot}
  superblock = Superblock.new(@uuid, 0, 1, @block_size, nr_data_blocks)

  devices = Array.new
  offset = 0
  0.upto(nr_thins - 1) do |dev|
    mappings = Array.new
    nr_mappings = mapping_counts[dev]

    if nr_mappings > 0
      mappings << Mapping.new(0, offset, nr_mappings, 1)
      offset += nr_mappings
    end

    devices << Device.new(dev, nr_mappings, 0, 0, 0, mappings)
  end

  Metadata.new(superblock, devices)
end