Class: PropertyList

Inherits:
Array
  • Object
show all
Defined in:
lib/active_rdf/objectmanager/property_list.rb

Overview

Simple class which will contain all values of a specified property related to a subject. It provides some useful shortcut methods to work with properties and related values.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Array

#extract_options!

Constructor Details

#initialize(p, pv_list, s, writeable = true) ⇒ PropertyList

Initialize a new list of properties’ values

  • p the original property

  • pv_list the list of properties’ values

  • s the sobject which property is related to

  • writeable if set to false, the list will be write-protected



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# File 'lib/active_rdf/objectmanager/property_list.rb', line 15

def initialize(p, pv_list, s, writeable = true)
  super pv_list
  @s, @p = s, p
  @writeable = writeable
end

Instance Attribute Details

#p ⇒ Object (readonly)

Add reader accessor



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# File 'lib/active_rdf/objectmanager/property_list.rb', line 7

def p
  @p
end

#s ⇒ Object (readonly)

Add reader accessor



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# File 'lib/active_rdf/objectmanager/property_list.rb', line 7

def s
  @s
end

#writeable ⇒ Object

Returns the value of attribute writeable.



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# File 'lib/active_rdf/objectmanager/property_list.rb', line 8

def writeable
  @writeable
end

Instance Method Details

#<<(pv) ⇒ Object 



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# File 'lib/active_rdf/objectmanager/property_list.rb', line 23

def <<(pv)
  check_writeable!
  # update the array list
  add pv
  
  # insert the new statment into the store
  ActiveRDF::FederationManager.add(@s, @p, pv)
end

#add ⇒ Object

add a new property value realated to @p property and @s subject



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# File 'lib/active_rdf/objectmanager/property_list.rb', line 22

alias :add :<<

#remove(*params) ⇒ Object

if no papameters will be specified, delete every triple related to :s and p: otherwise delete the triples whose values are specified by params



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# File 'lib/active_rdf/objectmanager/property_list.rb', line 47

def remove(*params)
  check_writeable!
  if params.length >= 1
    # delete only triples whose values is specified by parameters
    params.each{|param|
      if self.delete(param)
        return ActiveRDF::FederationManager.delete(@s, @p, param)
      end
    }
  else
    # delete every triple related to :s and :p whose values is contained by self...
    self.each{|value|
      if ActiveRDF::FederationManager.delete(@s, @p, value) == false
        return false
      end
    }
    # ...and clear the array Poperty_list array
    self.clear
    return true
  end
end

#replace(old_p_value, new_p_value) ⇒ Object

delete a statment which contains old_p_value and insert a new statment (@s, @p, new_p_value)



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# File 'lib/active_rdf/objectmanager/property_list.rb', line 34

def replace(old_p_value, new_p_value)
  check_writeable!
  # delete the old statment
  self.delete(old_p_value)
  ActiveRDF::FederationManager.delete(@s, @p, old_p_value)
  
  # insert the new statment
  self << new_p_value
end