Class: Balmora::Context

Inherits:
Command show all
Defined in:
lib/balmora/context.rb

Direct Known Subclasses

ConfigChanged, Exec, Value

Defined Under Namespace

Classes: ConfigChanged, Exec, ExecResult, Value

Instance Method Summary collapse

Methods inherited from Command

#_execute

Constructor Details

#initialize(state, context) ⇒ Context

Returns a new instance of Context.



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# File 'lib/balmora/context.rb', line 3

def initialize(state, context)
  @state = state

  @logger = state.logger
  @shell = state.shell
  @config = state.config
  @variables = state.variables
  @balmora = state.balmora

  @context = context
end

Instance Method Details

#_not(is_not, result) ⇒ Object 



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# File 'lib/balmora/context.rb', line 81

def _not(is_not, result)
  if is_not
    return !result
  end

  return result
end

#execute ⇒ Object 



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# File 'lib/balmora/context.rb', line 47

def execute()
  result = run()

  operator = @operator

  is_not = false
  if operator.start_with?('not-')
    is_not = true
    operator = operator[4..-1]
  end

  case operator
    when 'match'
      return _not(is_not, result.match(@operand) != nil)
    when 'equal'
      return _not(is_not, result == @operand)
    when 'greater'
      return _not(is_not, result > @operand)
    when 'greater-or-equal'
      return _not(is_not, result >= @operand)
    when 'lesser'
      return _not(is_not, result < @operand)
    when 'lesser-or-equal'
      return _not(is_not, result <= @operand)
  end

  raise Error.new("Unknown operator #{operator}")
rescue => error
  @logger.error("#{error.inspect()}; failed to run " +
    "context: #{@context.inspect()}")

  raise error
end

#init ⇒ Object 



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# File 'lib/balmora/context.rb', line 15

def init()
  if (@context.keys() - [:context] - options()).length != 0
    raise Error.new("Unknown options #{(@context.keys() - [:context] -
      options()).inspect()}")
  end

  options().each() { |key|
    if self.instance_variable_defined?(:"@#{key}")
      raise Error.new("Can not use #{key} as option")
    end

    option = @context.fetch(key, nil)
    self.instance_variable_set(:"@#{key}", option)
  }

  verify()
end

#option(option) ⇒ Object 



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# File 'lib/balmora/context.rb', line 93

def option(option)
  return @variables.inject(self.instance_variable_get(:"@#{option}"))
end

#options ⇒ Object 



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# File 'lib/balmora/context.rb', line 33

def options()
  return [:operator, :operand]
end

#run ⇒ Object

Raises:



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# File 'lib/balmora/context.rb', line 89

def run()
  raise Error.new("run should be implemented in subclass")
end

#verify ⇒ Object 



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# File 'lib/balmora/context.rb', line 37

def verify()
  if @operator.nil?()
    raise Error.new('"operator" should be defined')
  end

  if @operand.nil?()
    raise Error.new('"operand" should be defined')
  end
end