Module: Bosh::Template::PropertyHelper

Included in:
EvaluationContext, EvaluationLink, EvaluationLinkInstance
Defined in:
lib/bosh/template/property_helper.rb

Instance Method Summary collapse

Instance Method Details

#copy_property(dst, src, name, default = nil) ⇒ Object

Copies property with a given name from src to dst.

Parameters:

  • dst (Hash) —

    Property destination

  • src (Hash) —

    Property source

  • name (String) —

    Property name (dot-separated)

  • default (Object) (defaults to: nil) —

    Default value (if property is not in src)



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# File 'lib/bosh/template/property_helper.rb', line 11

def copy_property(dst, src, name, default = nil)
  keys = name.split(".")
  src_ref = src
  dst_ref = dst

  keys.each do |key|
    unless src_ref.is_a?(Hash)
      raise Bosh::Template::InvalidPropertyType,
        "Property '#{name}' expects a hash, but received '#{src_ref.class}'"
    end
    src_ref = src_ref[key]
    break if src_ref.nil? # no property with this name is src
  end

  keys[0..-2].each do |key|
    dst_ref[key] ||= {}
    dst_ref = dst_ref[key]
  end

  dst_ref[keys[-1]] ||= {}
  dst_ref[keys[-1]] = src_ref.nil? ? default : src_ref
end

#lookup_property(collection, name) ⇒ Object

Parameters:

  • collection (Hash) —

    Property collection

  • name (String) —

    Dot-separated property name



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# File 'lib/bosh/template/property_helper.rb', line 36

def lookup_property(collection, name)
  return nil if collection.nil?
  keys = name.split(".")
  ref = collection

  keys.each do |key|
    ref = ref[key]
    return nil if ref.nil?
  end

  ref
end