Class: MARC::ControlField

Inherits:
Object show all
Defined in:
lib/marc/controlfield.rb

Overview

MARC records contain control fields, each of which has a tag and value. Tags for control fields must be in the 001-009 range.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tag, value = '') ⇒ ControlField

The constructor which must be passed a tag value and an optional value for the field.



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# File 'lib/marc/controlfield.rb', line 18

def initialize(tag,value='')
  @tag = tag
  @value = value
  if tag.to_i > 9 
    raise MARC::Exception.new(), "tag must be greater than 009"
  end
end

Instance Attribute Details

#tag ⇒ Object

the tag value (007, 008, etc)



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# File 'lib/marc/controlfield.rb', line 10

def tag
  @tag
end

#value ⇒ Object

the value of the control field



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# File 'lib/marc/controlfield.rb', line 13

def value
  @value
end

Instance Method Details

#==(other) ⇒ Object

Two control fields are equal if their tags and values are equal.



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# File 'lib/marc/controlfield.rb', line 28

def ==(other)
  if @tag != other.tag
    return false 
  elsif @value != other.value
    return false
  end
  return true
end

#=~(regex) ⇒ Object 



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# File 'lib/marc/controlfield.rb', line 41

def =~(regex)
  return self.to_s =~ regex
end

#to_s ⇒ Object 



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# File 'lib/marc/controlfield.rb', line 37

def to_s
  return "#{tag} #{value}" 
end