Class: Hashery::StaticHash

Inherits:
CRUDHash show all
Defined in:
lib/hashery/static_hash.rb

Overview

TODO:

Maybe StaticHash isn’t bets name for this class?

StaticHash ia a Hash object which raises an error if any previously-defined key attempts to be set again.

foo = StaticHash.new
foo['name'] = 'Tom'    #=> 'Tom'
foo['age']  = 30       #=> 30
foo['name'] = 'Bob'

produces

ArgumentError: Duplicate key for StaticHash -- 'name'

StaticHash has it’s orgins in Gavin Kistner’s WriteOnceHash class found in his basiclibrary.rb script.

Constant Summary

Constants inherited from CRUDHash

CRUDHash::NA

Instance Method Summary collapse

Methods inherited from CRUDHash

#<<, #[], [], #[]=, auto, #cast, #cast_key, #default_proc, #delete, #each, #fetch, #key?, #key_proc, #key_proc=, #merge, #read, #replace, #retrieve, #to_hash, #update, #values_at

Methods inherited from Hash

create, #rekey, #rekey!, #retrieve, #to_hash, #to_stash

Instance Method Details

#store(key, value) ⇒ Object

Set a value for a key. Raises an error if that key already exists with a different value.

Parameters:

  • key —

    Index key to associate with value.

  • value —

    Value to associate with key.

  • Retruns —

    value.



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# File 'lib/hashery/static_hash.rb', line 31

def store(key, value)
  if key?(key) && fetch(key) != value
    raise ArgumentError, "Duplicate key for StaticHash -- #{key.inspect}"
  end
  super(key, value)
end