class TaskJuggler::LogicalAttribute

This class handles operands that are property attributes. They are addressed by attribute ID and scenario index. The expression provides the property reference.

Public Class Methods

new(attribute, scenario) click to toggle source

Calls superclass method TaskJuggler::LogicalOperation::new

# File lib/taskjuggler/LogicalOperation.rb, line 186
def initialize(attribute, scenario)
  @scenario = scenario
  super
end

Public Instance Methods

eval(expr) click to toggle source

To evaluate a property attribute we use the Query mechanism to retrieve the value.

# File lib/taskjuggler/LogicalOperation.rb, line 193
def eval(expr)
  query = expr.query.dup
  query.scenarioIdx = @scenario.sequenceNo - 1
  query.attributeId = @operand1
  query.process
  if query.ok
    # The logical expressions are mostly about comparing values. So we use
    # the sortableResult of the Query. This creates some challenges for load
    # values, as the user is not accustomed to the internal representation
    # of those.
    # Convert nil results into empty Strings if necessary
    query.result || ''
  else
    expr.error(query.errorMessage)
    query.errorMessage
  end
end

to_s(query) click to toggle source

Dumps the LogicalOperation as String. If query is nil, the variable names are shown, otherwise their values.

# File lib/taskjuggler/LogicalOperation.rb, line 213
def to_s(query)
  if query
    query = query.dup
    query.scenarioIdx = @scenario.sequenceNo - 1
    query.attributeId = @operand1
    query.process
    unless query.ok
      return "Error in conversion to String: #{query.errorMessage}"
    end
    query.to_s
  else
    "#{@scenario.fullId}.#{@operand1}"
  end
end