Module: RequestLogAnalyzer::Output

5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

# File 'lib/request_log_analyzer/output.rb', line 5

def self.load(file_format, *args)
  
  klass = nil
  if file_format.kind_of?(RequestLogAnalyzer::Output::Base)
    # this already is a file format! return itself
    return file_format

  elsif file_format.kind_of?(Class) && file_format.ancestors.include?(RequestLogAnalyzer::Output::Base)
    # a usable class is provided. Use this format class.
    klass = file_format

  elsif file_format.kind_of?(String) && File.exist?(file_format)
    # load a format from a ruby file
    require file_format
    const = RequestLogAnalyzer.to_camelcase(File.basename(file_format, '.rb'))
    if RequestLogAnalyzer::FileFormat.const_defined?(const)
      klass = RequestLogAnalyzer::Output.const_get(const)
    elsif Object.const_defined?(const)
      klass = Object.const_get(const)
    else
      raise "Cannot load class #{const} from #{file_format}!"
    end

  else
    # load a provided file format
    klass = RequestLogAnalyzer::Output.const_get(RequestLogAnalyzer.to_camelcase(file_format))
  end

  # check the returned klass to see if it can be used
  raise "Could not load a file format from #{file_format.inspect}" if klass.nil?
  raise "Invalid FileFormat class" unless klass.kind_of?(Class) && klass.ancestors.include?(RequestLogAnalyzer::Output::Base)

  klass.create(*args) # return an instance of the class
end