Module: Madeleine::Automatic::Deserialize

Defined in:

lib/madeleine/automatic.rb

Overview

:nodoc:

Class Method Summary

• .detect(io) ⇒ Object

  Detect format of an io stream.

• .load(io, marshaller = Marshal) ⇒ Object

  If detection didn’t work, raise up the exception.

Class Method Details

.detect(io) ⇒ Object

Detect format of an io stream. Leave it rewound.

# File 'lib/madeleine/automatic.rb', line 367

def Deserialize.detect(io)
  c = io.getc
  c1 = io.getc
  io.rewind
  if (c == Marshal::MAJOR_VERSION && c1 <= Marshal::MINOR_VERSION)
    Marshal
  elsif (c == 31 && c1 == 139) # gzip magic numbers
    ZMarshal
  else
    while (s = io.gets)
      break if (s !~ /^\s*$/) # ignore blank lines
    end
    io.rewind
    if (s && s =~ /^\s*<\?[xX][mM][lL]/) # "<?xml" begins an xml serialization
      SOAP::Marshal
    else
      while (s = io.gets)
        break if (s !~ /^\s*#/ && s !~ /^\s*$/) # ignore blank and comment lines
      end
      io.rewind
      if (s && s =~ /^\s*---/) # "---" is the yaml header
        YAML
      else
        nil # failed to detect
      end
    end
  end
end

.load(io, marshaller = Marshal) ⇒ Object

If detection didn’t work, raise up the exception

# File 'lib/madeleine/automatic.rb', line 400

def Deserialize.load(io, marshaller=Marshal)
  begin
    raise "Must detect with YAML" if marshaller == YAML
    marshaller.load(io)
  rescue Exception => e
    io.rewind
    detected_marshaller = detect(io)
    if (detected_marshaller == ZMarshal)
      zio = Zlib::GzipReader.new(io)
      detected_zmarshaller = detect(zio)
      zio.finish
      io.rewind
      if (detected_zmarshaller)
        ZMarshal.new(detected_zmarshaller).load(io)
      else
        raise e
      end
    elsif (detected_marshaller)
      detected_marshaller.load(io)
    else
      raise e
    end
  end
end