Class: Matching::HashIndex

Inherits:
Object
  • Object
show all
Defined in:
lib/matching/hash_index.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ HashIndex

Returns a new instance of HashIndex.



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# File 'lib/matching/hash_index.rb', line 6

def initialize
  #one hash for each attribute
  @hashes = {}
end

Instance Attribute Details

#hashes ⇒ Object (readonly)

Returns the value of attribute hashes.



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# File 'lib/matching/hash_index.rb', line 4

def hashes
  @hashes
end

Instance Method Details

#get(attr, val) ⇒ Object

Return an array of object ids for a given attribute and value



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# File 'lib/matching/hash_index.rb', line 20

def get(attr, val)
  (@hashes[attr] ? @hashes[attr][val] : nil)
end

#put(attr, val, id) ⇒ Object

Add a value to the index for a given attribute and object id



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# File 'lib/matching/hash_index.rb', line 12

def put(attr, val, id)
  unless val.nil?
    h = @hashes[attr] || (@hashes[attr] = {})
    (h[val] ? h[val] << id : h[val] = [id])
  end
end