Class: AMEE::DataAbstraction::Usage

Inherits:
Input
  • Object
show all
Defined in:
lib/amee-data-abstraction/usage.rb

Overview

Subclass of Input providing methods and attributes appropriate for representing adjustable calculation usages specifically.

Only one instance of Usage can be assocaited with a particular calucaltion object. When the value of self is changed, profile item value terms which are forbidden in the new usage will be inactivated and optional/compulsory flags are set on the remaining terms.

Constant Summary

Constants inherited from Term

Term::Interfaces, Term::UnitFields

Instance Attribute Summary

Attributes inherited from Input

#dirty

Attributes inherited from Term

#parent, #value_before_cast

Instance Method Summary collapse

Methods inherited from Input

#choice_validation_message, #compulsory!, #compulsory?, #dirty?, #disabled?, #fixed, #fixed?, #invalid, #optional!, #optional?, #options_for_select, #validate!, #validation, #validation_message

Methods inherited from Term

#==, #after?, #before?, #convert_unit, convert_value_to_type, #disable!, #disabled?, #enable!, #enabled?, #has_numeric_value?, #hidden?, #hide!, #initialize_copy, #inspect, #interface, #note, #set?, #show!, #to_quantity, #to_s, #unset?, validate_dimensional_equivalence?, #visible?

Constructor Details

#initialize(options = {}, &block) ⇒ Usage

Initialization of Usage objects follows that of the parent Input class, with a number of differences.

If the parent caluclation already contains a usage term, a TwoUsages exception is raised.

The label<tt> attribute is set by default to <tt>:usage.

The interface attribute of self is set to :drop_down by default, but can be manually configured if required.

The inactive property of self is set to :invisible by default.

Raises:



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# File 'lib/amee-data-abstraction/usage.rb', line 34

def initialize(options={},&block)
  raise Exceptions::TwoUsages if options[:parent].current_usage
  label :usage
  @inactive=:invisible
  super
  interface :drop_down unless interface
end

Instance Method Details

#activate_selected(usage = nil) ⇒ Object

Activate and deactivate terms in the parent calculation according to the compulsory/optional/forbidden status’ of each in the usage indicated by usage



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# File 'lib/amee-data-abstraction/usage.rb', line 65

def activate_selected(usage=nil)
  parent.profiles.in_use(usage).each do |term|
    case @inactive
    when :invisible
      term.show!
    when :disabled
      term.enable!
    end
  end
  parent.profiles.out_of_use(usage).each do |term|
    case @inactive
    when :invisible
      term.hide!
    when :disabled
      term.disable!
    end
  end
end

#choices ⇒ Object

Returns an array of available valid values for self.



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# File 'lib/amee-data-abstraction/usage.rb', line 85

def choices
  parent.amee_usages
end

#value(*args) ⇒ Object

Adjust the value of self indicating that a new usage should be switch to in the parent caluclation. This method has the effect of (de)activating terms in the parent calculation as appropriate.



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# File 'lib/amee-data-abstraction/usage.rb', line 53

def value(*args)
  unless args.empty?
    @value=args.first
    activate_selected(value)
  end
  super
end