Class: Hotdog::Commands::Search::TagExpressionNode

Inherits:
ExpressionNode show all
Defined in:
lib/hotdog/commands/search.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(identifier, attribute) ⇒ TagExpressionNode

Returns a new instance of TagExpressionNode.



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# File 'lib/hotdog/commands/search.rb', line 261

def initialize(identifier, attribute)
  @identifier = identifier
  @attribute = attribute
end

Instance Attribute Details

#attribute ⇒ Object (readonly)

Returns the value of attribute attribute.



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# File 'lib/hotdog/commands/search.rb', line 266

def attribute
  @attribute
end

#identifier ⇒ Object (readonly)

Returns the value of attribute identifier.



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# File 'lib/hotdog/commands/search.rb', line 265

def identifier
  @identifier
end

Instance Method Details

#attribute? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hotdog/commands/search.rb', line 270

def attribute?
  !attribute.nil?
end

#evaluate(environment) ⇒ Object 



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# File 'lib/hotdog/commands/search.rb', line 273

def evaluate(environment)
  if identifier?
    if attribute?
      case identifier
      when /\Ahost\z/i
        values = environment.execute(<<-EOS, attribute).map { |row| row.first }
          SELECT hosts_tags.id FROM hosts
            WHERE LOWER(hosts.name) = LOWER(?);
        EOS
      else
        values = environment.execute(<<-EOS, identifier, attribute).map { |row| row.first }
          SELECT DISTINCT hosts_tags.host_id FROM hosts_tags
            INNER JOIN tags ON hosts_tags.tag_id = tags.id
              WHERE LOWER(tags.name) = LOWER(?) AND LOWER(tags.value) = LOWER(?);
        EOS
      end
    else
      values = environment.execute(<<-EOS, identifier, identifier, identifier).map { |row| row.first }
        SELECT DISTINCT hosts_tags.host_id FROM hosts_tags
          INNER JOIN hosts ON hosts_tags.host_id = hosts.id
          INNER JOIN tags ON hosts_tags.tag_id = tags.id
            WHERE LOWER(hosts.name) = LOWER(?) OR LOWER(tags.name) = LOWER(?) OR LOWER(tags.value) = LOWER(?);
      EOS
    end
  else
    if attribute?
      values = environment.execute(<<-EOS, attribute).map { |row| row.first }
        SELECT DISTINCT hosts_tags.host_id FROM hosts_tags
          INNER JOIN tags ON hosts_tags.tag_id = tags.id
            WHERE LOWER(tags.value) = LOWER(?);
      EOS
    else
      values = []
    end
  end
  if not environment.fixed_string? and values.empty?
    # fallback to glob expression
    identifier_glob = identifier.gsub(/[-.\/_]/, "?") if identifier?
    attribute_glob = attribute.gsub(/[-.\/_]/, "?") if attribute?
    if (identifier? and identifier != identifier_glob) or (attribute? and attribute != attribute_glob)
      environment.logger.info("fallback to glob expression: %s:%s" % [identifier_glob, attribute_glob])
      values = TagGlobExpressionNode.new(identifier_glob, attribute_glob).evaluate(environment)
    end
  end
  values
end

#identifier? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hotdog/commands/search.rb', line 267

def identifier?
  !identifier.nil?
end