Class: ArrayFields::FieldSet

Inherits:
Object
  • Object
show all
Defined in:
lib/rq/arrayfields.rb

Overview

multiton cache of fields - wraps fields and fieldpos map to save memory

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(fields) ⇒ FieldSet

Returns a new instance of FieldSet.

Raises:

  • (ArgumentError) 


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# File 'lib/rq/arrayfields.rb', line 27

def initialize fields
  raise ArgumentError, "<#{ fields.inspect }> not inject-able" unless
    fields.respond_to? :inject

  @fieldpos =
    fields.inject({}) do |h, f|
      unless String === f or Symbol === f
        raise ArgumentError, "<#{ f.inspect }> neither String nor Symbol"
      end
      h[f] = h.size
      h
    end

  @fields = fields
end

Instance Attribute Details

#fieldpos ⇒ Object (readonly)

Returns the value of attribute fieldpos.



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# File 'lib/rq/arrayfields.rb', line 26

def fieldpos
  @fieldpos
end

#fields ⇒ Object (readonly)

Returns the value of attribute fields.



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# File 'lib/rq/arrayfields.rb', line 25

def fields
  @fields
end

Class Method Details

.init_sets ⇒ Object 



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# File 'lib/rq/arrayfields.rb', line 18

def init_sets
  @sets = {}
end

.new(fields) ⇒ Object 



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# File 'lib/rq/arrayfields.rb', line 15

def new fields
  @sets[fields] ||= super
end

Instance Method Details

#pos(f) ⇒ Object 



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# File 'lib/rq/arrayfields.rb', line 42

def pos f
  return @fieldpos[f] if @fieldpos.has_key? f 
  f = f.to_s
  return @fieldpos[f] if @fieldpos.has_key? f 
  f = f.intern
  return @fieldpos[f] if @fieldpos.has_key? f 
  nil
end