Class: Runt::Collection

Inherits:
Object
  • Object
show all
Includes:
TExpr
Defined in:
lib/runt/temporalexpression.rb

Overview

Base class for TExpr classes that can be composed of other TExpr objects imlpemented using the Composite(GoF) pattern.

Direct Known Subclasses

Intersect, Union

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from TExpr

#&, #-, #and, #dates, #include?, #minus, #or, #|

Constructor Details

#initialize ⇒ Collection

Returns a new instance of Collection.



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# File 'lib/runt/temporalexpression.rb', line 90

def initialize
  @expressions = Array.new
end

Instance Attribute Details

#expressions ⇒ Object (readonly)

Returns the value of attribute expressions.



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# File 'lib/runt/temporalexpression.rb', line 88

def expressions
  @expressions
end

Instance Method Details

#add(anExpression) ⇒ Object 



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# File 'lib/runt/temporalexpression.rb', line 94

def add(anExpression)
  @expressions.push anExpression
  self
end

#display ⇒ Object 



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# File 'lib/runt/temporalexpression.rb', line 125

def display
  puts "I am a #{self.class} containing:"
  @expressions.each do |ex| 
    pp "#{ex.class}"
  end
end

#overlap?(date_expr) ⇒ Boolean

Will return true if the supplied object overlaps with the range used to create this instance

Returns:

  • (Boolean) 


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# File 'lib/runt/temporalexpression.rb', line 101

def overlap?(date_expr)
  @expressions.each do | interval |
    return true if date_expr.overlap?(interval)      
  end
  false    
end

#to_s ⇒ Object 



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# File 'lib/runt/temporalexpression.rb', line 108

def to_s
  if !@expressions.empty? && block_given?
    first_expr, next_exprs = yield
    result = '' 
    @expressions.map do |expr|
	if @expressions.first===expr
 result = first_expr + expr.to_s
	else
result = result + next_exprs + expr.to_s
	end 
    end
    result
  else
    'empty'
  end
end