Class: Mapscript::MapscriptEnumerable

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/mapscript/mapscript_extensions.rb

Overview

Generic iterator for Mapscript collections

Direct Known Subclasses

LayerClasses, MapLayers

Instance Method Summary collapse

Constructor Details

#initialize(parent, size_method, getter) ⇒ MapscriptEnumerable

Returns a new instance of MapscriptEnumerable.



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# File 'lib/mapscript/mapscript_extensions.rb', line 11

def initialize(parent, size_method, getter)
  @parent, @size_method, @getter  = parent, size_method, getter
end

Instance Method Details

#[](idx) ⇒ Object 



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# File 'lib/mapscript/mapscript_extensions.rb', line 25

def [](idx)
  case idx
    when Fixnum
      if idx >= 0
        @parent.send(@getter, idx)
      else
        @parent.send(@getter, size+idx)
      end
    when Range
      to_a[idx]
    else
      raise TypeError, "Unsupported type for index"
  end
end

#each ⇒ Object 



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# File 'lib/mapscript/mapscript_extensions.rb', line 19

def each
  0.upto(size-1) do |idx|
    yield @parent.send(@getter, idx)
  end
end

#size ⇒ Object 



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# File 'lib/mapscript/mapscript_extensions.rb', line 15

def size
  @parent.send(@size_method)
end