Class: BeanSprout::SproutBunch

Inherits:
Object
  • Object
show all
Includes:
PackagePrivate::InternalClass
Defined in:
lib/bean_sprout/transaction.rb

Defined Under Namespace

Classes: IllegalStateError, NotBalancedError

Instance Attribute Summary collapse

Attributes included from PackagePrivate::InternalClass

#public_interface

Instance Method Summary collapse

Methods included from PackagePrivate::InternalClass

#bind_public_interface, included

Constructor Details

#initialize(id, sprouts) ⇒ SproutBunch

Returns a new instance of SproutBunch.



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# File 'lib/bean_sprout/transaction.rb', line 17

def initialize id, sprouts
  @id = id
  @sprouts = sprouts
end

Instance Attribute Details

#sprouts ⇒ Object (readonly)

Returns the value of attribute sprouts.



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# File 'lib/bean_sprout/transaction.rb', line 7

def sprouts
  @sprouts
end

Instance Method Details

#balanced! ⇒ Object

Raises:



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# File 'lib/bean_sprout/transaction.rb', line 33

def balanced!
  raise NotBalancedError.new("#{@sprouts} not balanced.") unless balanced?
end

#balanced? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bean_sprout/transaction.rb', line 22

def balanced?
  balances = Hash.new(0)
  @sprouts.each do |sprout|
    currency = sprout.bean.currency
    balances[currency] += sprout.amount
  end
  balances.values.inject(true) do |acc, currency_balance|
    acc && currency_balance == 0
  end
end

#plant ⇒ Object

Raises:



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# File 'lib/bean_sprout/transaction.rb', line 37

def plant
  balanced!
  raise IllegalStateError, "Can't plant twice." if @in_place
  sprouts.each do |sprout|
    sprout.bean.grow sprout
  end
  @in_place = true
end

#remove ⇒ Object

Raises:



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# File 'lib/bean_sprout/transaction.rb', line 46

def remove
  balanced!
  raise IllegalStateError, "Must plant before remove." unless @in_place
  sprouts.each do |sprout|
    sprout.bean.pick sprout
  end
  @in_place = false
end