Module: ContentData

Defined in:
lib/content_data.rb,
lib/content_data/version.rb,
lib/content_data/content_data.rb,
lib/content_data/dynamic_content_data.rb

Overview

Data structure for an abstract layer over files. Each binary sequence is a content, each file is content instance.

Defined Under Namespace

Classes: Content, ContentData, ContentInstance, DynamicContentData

Constant Summary collapse

VERSION = 
"1.0.0"

Instance Method Summary collapse

Instance Method Details

#validate(params = nil) ⇒ Boolean

Validates index against file system that all instances hold a correct data regarding files that they represrents.

There are two levels of validation, controlled by instance_check_level system parameter:

  • shallow - quick, tests instance for file existence and attributes.

  • deep - can take more time, in addition to shallow recalculates hash sum.

Parameters:

  • params (Hash) (defaults to: nil) —

    hash of parameters of validation, can be used to return additional data.

    Supported key/value combinations:

    • key is :failed value is ContentData used to return failed instances

Returns:

  • (Boolean) —

    true when index is correct, false otherwise

Raises:

  • (ArgumentError) —

    when instance_check_level is incorrect



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# File 'lib/content_data/content_data.rb', line 576

def validate(params = nil)
  # used to answer whether specific param was set
  param_exists = Proc.new do |param|
    !(params.nil? || params[param].nil?)
  end

  # used to process method parameters centrally
  process_params = Proc.new do |values|
    # values is a Hash with keys: :content, :instance and value appropriate to key
    if param_exists.call :failed
      unless values[:content].nil?
        params[:failed].add_content values[:content]
      end
      unless values[:instance].nil?
        # appropriate content should be already added
        params[:failed].add_instance values[:instance]
      end
    end
  end

  is_valid = true
  instances.each_value do |instance|
    unless check_instance instance
      is_valid = false

      unless params.nil? || params.empty?
        process_params.call :content => contents[instance.checksum], :instance => instance
      end
    end
  end

  is_valid
end