### Home Classes Methods

### In Files

- lib/chef/node/attribute.rb

### Parent

Object

### Methods

- ::new
- #[]
- #[]=
- #attribute
- #attribute=
- #attribute?
- #auto_vivifiy
- #auto_vivifiy_on_read?
- #component_has_key?
- #delete
- #delete_from_component
- #determine_value
- #each
- #each_attribute
- #each_key
- #each_pair
- #each_value
- #empty?
- #fetch
- #get_keys
- #get_value
- #has_key?
- #has_value?
- #hash_and_not_cna?
- #include?
- #index
- #inspect
- #key?
- #keys
- #kind_of?
- #length
- #member?
- #method_missing
- #reset
- #set_type_hash
- #set_value
- #size
- #to_hash
- #value?
- #value_at_current_nesting
- #value_or_descend
- #values

### Included Modules

- Enumerable

### Files

- LICENSE
- README.rdoc

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# Chef::Node::Attribute

### Constants

HIDDEN_ATTRIBUES

### Attributes

auto_vivifiy_on_read[RW]
automatic[RW]
current_automatic[RW]
current_default[RW]
current_normal[RW]
current_override[RW]
default[RW]
normal[RW]
override[RW]
set_type[RW]
set_unless_value_present[RW]

### Public Class Methods

new(normal, default, override, automatic, state=[]) click to toggle source

    # File lib/chef/node/attribute.rb, line 42
    def initialize(normal, default, override, automatic, state=[])
      @normal = normal
      @current_normal = normal
      @default = default
      @current_default = default
      @override = override
      @current_override = override
      @automatic = automatic
      @current_automatic = automatic
      @current_nesting_level = state
      @auto_vivifiy_on_read = false
      @set_unless_value_present = false
      @set_type = nil
      @has_been_read = false
    end

### Public Instance Methods

[](key) click to toggle source

    # File lib/chef/node/attribute.rb, line 89
    def [](key)
      @current_nesting_level << key

      # We set this to so that we can cope with ||= as a setting.
      # See the comments in []= for more details.
      @has_been_read = true

      # If we have a set type, our destiny is to write
      if @set_type
        a_value = @set_type == :automatic ? value_or_descend(current_automatic, key, auto_vivifiy_on_read) : nil
        o_value = @set_type == :override ? value_or_descend(current_override, key, auto_vivifiy_on_read) : nil
        n_value = @set_type == :normal ? value_or_descend(current_normal, key, auto_vivifiy_on_read) : nil
        d_value = @set_type == :default ? value_or_descend(current_default, key, auto_vivifiy_on_read) : nil

        determine_value(a_value, o_value, n_value, d_value)
      # Our destiny is only to read, so we get the full list.
      else
        a_value = value_or_descend(current_automatic, key)
        o_value = value_or_descend(current_override, key)
        n_value = value_or_descend(current_normal, key)
        d_value = value_or_descend(current_default, key)

        determine_value(a_value, o_value, n_value, d_value)
      end
    end

[]=(key, value) click to toggle source

    # File lib/chef/node/attribute.rb, line 319
    def []=(key, value)
      # If we don't have one, then we'll pretend we're normal
      if @set_type.nil?
        @set_type = :normal
        warning=Setting attributes without specifying a precedence is deprecated and will beremoved in Chef 11.0. To set attributes at normal precedence, change code like:`node["key"] = "value"` # Not thisto:`node.set["key"] = "value"` # ThisCalled from:

        warning_with_line_nrs = caller[0...3].inject(warning) do |msg, source_line|
          msg << "  #{source_line}\n"
        end

        Chef::Log.warn(warning_with_line_nrs) if Chef::Config[:chef11_deprecation_warnings]
      end

      if set_unless_value_present
        if get_value(set_type_hash, key) != nil
          Chef::Log.debug("Not setting #{@current_nesting_level.join("/")}/#{key} to #{value.inspect} because it has a #{@set_type} value already")
          return false
        end
      end

      # If we have been read, and the key we are writing is the same
      # as our parent, we have most like been ||='ed.  So we need to
      # just rewind a bit.
      #
      # In practice, these objects are single use - this is just
      # supporting one more single-use style.
      @current_nesting_level.pop if @has_been_read && @current_nesting_level.last == key

      set_value(set_type_hash, key, value)
      value
    end

attribute() click to toggle source

    # File lib/chef/node/attribute.rb, line 58
    def attribute
      normal
    end

attribute=(value) click to toggle source

    # File lib/chef/node/attribute.rb, line 62
    def attribute=(value)
      normal = value
    end

attribute?(key) click to toggle source
Alias for: has_key?
auto_vivifiy(data_hash, key) click to toggle source

    # File lib/chef/node/attribute.rb, line 388
    def auto_vivifiy(data_hash, key)
      if data_hash.has_key?(key)
        unless data_hash[key].respond_to?(:has_key?)
          raise ArgumentError, "You tried to set a nested key, where the parent is not a hash-like object: #{@current_nesting_level.join("/")}/#{key} " unless auto_vivifiy_on_read
        end
      else
        data_hash[key] = Mash.new
      end
      data_hash
    end

auto_vivifiy_on_read?() click to toggle source

    # File lib/chef/node/attribute.rb, line 384
    def auto_vivifiy_on_read?
      auto_vivifiy_on_read
    end

component_has_key?(component_attrs,key) click to toggle source

    # File lib/chef/node/attribute.rb, line 488
    def component_has_key?(component_attrs,key)
      # get the Hash-like object at the current nesting level:
      nested_attrs = value_at_current_nesting(component_attrs, key)
      nested_attrs.respond_to?(:key?) && nested_attrs.key?(key)
    end

delete(key) click to toggle source

    # File lib/chef/node/attribute.rb, line 470
    def delete(key)
      [@automatic, @override, @normal, @default].inject(nil) do |return_value, attrs|
        deleted_value = delete_from_component(attrs, key)
        return_value || deleted_value
      end
    end

delete_from_component(component_attrs, key) click to toggle source

    # File lib/chef/node/attribute.rb, line 477
    def delete_from_component(component_attrs, key)
      # get the Hash-like object at the current nesting level:
      nested_attrs = value_at_current_nesting(component_attrs, key)

      if nested_attrs.respond_to?(:delete)
        nested_attrs.delete(key)
      else
        nil
      end
    end

determine_value(a_value, o_value, n_value, d_value) click to toggle source

    # File lib/chef/node/attribute.rb, line 289
    def determine_value(a_value, o_value, n_value, d_value)
      if hash_and_not_cna?(a_value)
        value = {}
        value = Chef::Mixin::DeepMerge.merge(value, d_value) if hash_and_not_cna?(d_value)
        value = Chef::Mixin::DeepMerge.merge(value, n_value) if hash_and_not_cna?(n_value)
        value = Chef::Mixin::DeepMerge.merge(value, o_value) if hash_and_not_cna?(o_value)
        value = Chef::Mixin::DeepMerge.merge(value, a_value)
        value
      elsif hash_and_not_cna?(o_value)
        value = {}
        value = Chef::Mixin::DeepMerge.merge(value, d_value) if hash_and_not_cna?(d_value)
        value = Chef::Mixin::DeepMerge.merge(value, n_value) if hash_and_not_cna?(n_value)
        value = Chef::Mixin::DeepMerge.merge(value, o_value)
        value
      elsif hash_and_not_cna?(n_value)
        value = {}
        value = Chef::Mixin::DeepMerge.merge(value, d_value) if hash_and_not_cna?(d_value)
        value = Chef::Mixin::DeepMerge.merge(value, n_value)
        value
      elsif hash_and_not_cna?(d_value)
        d_value
      else
        return a_value if ! a_value.nil?
        return o_value if ! o_value.nil?
        return n_value if ! n_value.nil?
        return d_value if ! d_value.nil?
        return nil
      end
    end

each(&block) click to toggle source

    # File lib/chef/node/attribute.rb, line 128
    def each(&block)
      get_keys.each do |key|
        value = determine_value(
          get_value(automatic, key),
          get_value(override, key),
          get_value(normal, key),
          get_value(default, key)
        )
        block.call([key, value])
      end
    end

each_attribute(&block) click to toggle source

    # File lib/chef/node/attribute.rb, line 152
    def each_attribute(&block)
      get_keys.each do |key|
        value = determine_value(
          get_value(automatic, key),
          get_value(override, key),
          get_value(normal, key),
          get_value(default, key)
        )
        block.call(key, value)
      end
    end

each_key(&block) click to toggle source

    # File lib/chef/node/attribute.rb, line 164
    def each_key(&block)
      get_keys.each do |key|
        block.call(key)
      end
    end

each_pair(&block) click to toggle source

    # File lib/chef/node/attribute.rb, line 140
    def each_pair(&block)
      get_keys.each do |key|
        value = determine_value(
          get_value(automatic, key),
          get_value(override, key),
          get_value(normal, key),
          get_value(default, key)
        )
        block.call(key, value)
      end
    end

each_value(&block) click to toggle source

    # File lib/chef/node/attribute.rb, line 170
    def each_value(&block)
      get_keys.each do |key|
        value = determine_value(
          get_value(automatic, key),
          get_value(override, key),
          get_value(normal, key),
          get_value(default, key)
        )
        block.call(value)
      end
    end

empty?() click to toggle source

    # File lib/chef/node/attribute.rb, line 182
    def empty?
      get_keys.empty?
    end

fetch(key, default_value=nil, &block) click to toggle source

    # File lib/chef/node/attribute.rb, line 186
    def fetch(key, default_value=nil, &block)
      if get_keys.include? key
        determine_value(
          get_value(automatic, key),
          get_value(override, key),
          get_value(normal, key),
          get_value(default, key)
        )
      elsif default_value
        default_value
      elsif block_given?
        block.call(key)
      else
        raise IndexError, "Key #{key} does not exist"
      end
    end

get_keys() click to toggle source

    # File lib/chef/node/attribute.rb, line 242
    def get_keys
      keys
    end

get_value(data_hash, key) click to toggle source

    # File lib/chef/node/attribute.rb, line 258
    def get_value(data_hash, key)
      last = nil

      if @current_nesting_level.length == 0
        if data_hash.has_key?(key) && ! data_hash[key].nil?
          return data_hash[key]
        else
          return nil
        end
      end

      0.upto(@current_nesting_level.length) do |i|
        if i == 0
          last = auto_vivifiy(data_hash, @current_nesting_level[i])
        elsif i == @current_nesting_level.length
          fk = last[@current_nesting_level[i - 1]]
          if fk.has_key?(key) && ! fk[key].nil?
            return fk[key]
          else
            return nil
          end
        else
          last = auto_vivifiy(last[@current_nesting_level[i - 1]], @current_nesting_level[i])
        end
      end
    end

has_key?(key) click to toggle source

    # File lib/chef/node/attribute.rb, line 115
    def has_key?(key)
      return true if component_has_key?(@default,key)
      return true if component_has_key?(@automatic,key)
      return true if component_has_key?(@normal,key)
      return true if component_has_key?(@override,key)
      false
    end

Also aliased as: attribute?, include?, key?, member?
has_value?(value) click to toggle source

    # File lib/chef/node/attribute.rb, line 217
    def has_value?(value)
      self.any? do |k,v|
        value == v
      end
    end

Also aliased as: value?
hash_and_not_cna?(to_check) click to toggle source

    # File lib/chef/node/attribute.rb, line 285
    def hash_and_not_cna?(to_check)
      (! to_check.kind_of?(Chef::Node::Attribute)) && to_check.respond_to?(:has_key?)
    end

include?(key) click to toggle source
Alias for: has_key?
index(value) click to toggle source

    # File lib/chef/node/attribute.rb, line 225
    def index(value)
      index = self.find do |h|
        value == h[1]
      end
      index.first if index.is_a? Array || nil
    end

inspect() click to toggle source

    # File lib/chef/node/attribute.rb, line 453
    def inspect
      determine_value(current_automatic, current_override, current_normal, current_default)

      "#<#{self.class} " << instance_variables.map{|iv|
        iv.to_s + '=' + (HIDDEN_ATTRIBUES.include?(iv.to_sym) ? "{...}" : instance_variable_get(iv).inspect)
      }.join(', ') << ">"
    end

key?(key) click to toggle source
Alias for: has_key?
keys() click to toggle source

    # File lib/chef/node/attribute.rb, line 246
    def keys
      tkeys = current_automatic ? current_automatic.keys : []
      [ current_override, current_normal, current_default ].each do |attr_hash|
        if attr_hash
          attr_hash.keys.each do |key|
            tkeys << key unless tkeys.include?(key)
          end
        end
      end
      tkeys
    end

kind_of?(klass) click to toggle source

Writing this method hurts me a little bit.

TODO: Refactor all this stuff so this kind of horror is no longer needed

We have invented a new kind of duck-typing, we call it Madoff typing. We just lie and hope we die before you recognize our scheme. :)

    # File lib/chef/node/attribute.rb, line 209
    def kind_of?(klass)
      if klass == Hash || klass == Mash || klass == Chef::Node::Attribute
        true
      else
        false
      end
    end

length() click to toggle source
Alias for: size
member?(key) click to toggle source
Alias for: has_key?
method_missing(symbol, *args) click to toggle source

Fetches or sets the value, depending on if any arguments are given.

#### Fetching

If no arguments are given, fetches the value:

    node.network
    => {network data}

Getters will find either a string or symbol key.

#### Setting

If arguments are given, a value will be set. Both normal setter and DSL style setters are allowed:

    node.foo = "bar"
    node.foo("bar")

Both set node = "bar"

    # File lib/chef/node/attribute.rb, line 435
    def method_missing(symbol, *args)
      if args.empty?
        if key?(symbol)
          self[symbol]
        elsif key?(symbol.to_s)
          self[symbol.to_s]
        elsif auto_vivifiy_on_read?
          self[symbol] = Mash.new
          self[symbol]
        else
          raise ArgumentError, "Attribute #{symbol} is not defined!" unless auto_vivifiy_on_read
        end
      else
        key_to_set = symbol.to_s[/^(.+)=$/, 1] || symbol
        self[key_to_set] = (args.length == 1 ? args[0] : args)
      end
    end

reset() click to toggle source

Reset our internal current_nesting_level to the top of every tree

    # File lib/chef/node/attribute.rb, line 80
    def reset
      @current_normal = @normal
      @current_default = @default
      @current_override = @override
      @current_automatic = @automatic
      @has_been_read = false
      @current_nesting_level = []
    end

set_type_hash() click to toggle source

    # File lib/chef/node/attribute.rb, line 66
    def set_type_hash
      case @set_type
      when :normal
        @normal
      when :override
        @override
      when :default
        @default
      when :automatic
        @automatic
      end
    end

set_value(data_hash, key, value) click to toggle source

    # File lib/chef/node/attribute.rb, line 359
    def set_value(data_hash, key, value)
      last = nil

      # If there is no current_nesting_level, just set the value
      if @current_nesting_level.length == 0
        data_hash[key] = value
        return data_hash
      end

      # Walk all the previous places we have been
      0.upto(@current_nesting_level.length) do |i|
        # If we are the first, we are top level, and should vivifiy the data_hash
        if i == 0
          last = auto_vivifiy(data_hash, @current_nesting_level[i])
        # If we are one past the last current_nesting_level, we are adding a key to that hash with a value
        elsif i == @current_nesting_level.length
          last[@current_nesting_level[i - 1]][key] = value
        # Otherwise, we're auto-vivifiy-ing an interim mash
        else
          last = auto_vivifiy(last[@current_nesting_level[i - 1]], @current_nesting_level[i])
        end
      end
      data_hash
    end

size() click to toggle source

    # File lib/chef/node/attribute.rb, line 236
    def size
      self.collect{}.length
    end

Also aliased as: length
to_hash() click to toggle source

    # File lib/chef/node/attribute.rb, line 461
    def to_hash
      result = determine_value(current_automatic, current_override, current_normal, current_default)
      if result.class == Hash
        result
      else
        result.to_hash
      end
    end

value?(value) click to toggle source
Alias for: has_value?
value_at_current_nesting(component_attrs, key) click to toggle source

    # File lib/chef/node/attribute.rb, line 494
    def value_at_current_nesting(component_attrs, key)
      @current_nesting_level.inject(component_attrs) do |subtree, intermediate_key|
        # if the intermediate value isn't a hash or doesn't have the intermediate key,
        # it can't have the bottom-level key we're looking for.
        (subtree.respond_to?(:key?) && subtree[intermediate_key]) or (return false)
      end
    end

value_or_descend(data_hash, key, auto_vivifiy=false) click to toggle source

    # File lib/chef/node/attribute.rb, line 399
    def value_or_descend(data_hash, key, auto_vivifiy=false)
      if auto_vivifiy
        hash_to_vivifiy = auto_vivifiy(data_hash, key)
        data_hash[key] = hash_to_vivifiy[key]
      else
        return nil if data_hash == nil
        return nil unless data_hash.has_key?(key)
      end

      if data_hash[key].respond_to?(:has_key?)
        cna = Chef::Node::Attribute.new(@normal, @default, @override, @automatic, @current_nesting_level)
        cna.current_normal = current_normal.nil? ? Mash.new : current_normal[key]
        cna.current_default   = current_default.nil? ? Mash.new : current_default[key]
        cna.current_override  = current_override.nil? ? Mash.new : current_override[key]
        cna.current_automatic  = current_automatic.nil? ? Mash.new : current_automatic[key]
        cna.auto_vivifiy_on_read = auto_vivifiy_on_read
        cna.set_unless_value_present = set_unless_value_present
        cna.set_type = set_type
        cna
      else
        data_hash[key]
      end
    end

values() click to toggle source

    # File lib/chef/node/attribute.rb, line 232
    def values
      self.collect { |h| h[1] }
    end

[Validate]

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