Class: AMF::Pure::AMF3Serializer

Inherits:
Object
  • Object
show all
Includes:
WriteIOHelpers
Defined in:
lib/amf/pure/serializer.rb

Overview

AMF3 implementation of serializer

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from WriteIOHelpers

#byte_order, #byte_order_little?, #pack_double, #pack_int16_network, #pack_int8, #pack_integer, #pack_word32_network

Constructor Details

#initialize(params = {}) ⇒ AMF3Serializer

Returns a new instance of AMF3Serializer.



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# File 'lib/amf/pure/serializer.rb', line 20

def initialize(params = {})
  @stream = ""
  @string_cache = SerializerCache.new :string
  @object_cache = SerializerCache.new :object
  @serializable_names = params[:serializable_names]
  @opts = params[:options]
end

Instance Attribute Details

#stream ⇒ Object

Returns the value of attribute stream.



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# File 'lib/amf/pure/serializer.rb', line 17

def stream
  @stream
end

#string_cache ⇒ Object (readonly)

Returns the value of attribute string_cache.



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# File 'lib/amf/pure/serializer.rb', line 18

def string_cache
  @string_cache
end

Instance Method Details

#serialize(obj, &block) ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 32

def serialize(obj, &block)
  if obj.is_a?(NilClass)
    write_null
  elsif obj.is_a?(TrueClass)
    write_true
  elsif obj.is_a?(FalseClass)
    write_false
  elsif obj.is_a?(Float)
    write_float(obj)
  elsif obj.is_a?(Integer)
    write_integer(obj)
  elsif obj.is_a?(Symbol) || obj.is_a?(String)
    write_string(obj.to_s)
  elsif obj.is_a?(Time)
    write_date(obj)
  elsif obj.is_a?(Array)
    write_array(obj, &block)
  elsif obj.is_a?(Hash) || obj.is_a?(Object)
    write_object(obj, &block)
  end
  @stream
end

#version ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 28

def version
  3
end

#write_array(array) ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 107

def write_array(array)
  @stream << AMF3_ARRAY_MARKER
  if @object_cache[array] != nil
    write_reference(@object_cache[array])
  else
    # Cache array
    @object_cache.add_obj(array)

    # Build AMF string
    header = array.length << 1 # make room for a low bit of 1
    header = header | 1 # set the low bit to 1
    @stream << pack_integer(header)
    @stream << AMF3_CLOSE_DYNAMIC_ARRAY
    array.each do |elem|
      if elem.respond_to?(:to_amf)
        @stream << elem.to_amf(@opts)
      else
        serialize(elem)
      end
    end
    
    block.call(self) if block_given?
  end
end

#write_date(date) ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 91

def write_date(date)
  @stream << AMF3_DATE_MARKER
  if @object_cache[date] != nil
    write_reference(@object_cache[date])
  else
    # Cache date
    @object_cache.add_obj(date)

    # Build AMF string
    date.utc unless date.utc?
    seconds = (date.to_f * 1000).to_i
    @stream << pack_integer(AMF3_NULL_MARKER)
    @stream << pack_double(seconds)
  end
end

#write_false ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 68

def write_false
  @stream << AMF3_FALSE_MARKER
end

#write_float(float) ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 81

def write_float(float)
  @stream << AMF3_DOUBLE_MARKER
  @stream << pack_double(float)
end

#write_integer(int) ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 72

def write_integer(int)
  if int < MIN_INTEGER || int > MAX_INTEGER # Check valid range for 29 bits
    write_float(int.to_f)
  else
    @stream << AMF3_INTEGER_MARKER
    @stream << pack_integer(int)
  end
end

#write_null ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 60

def write_null
  @stream << AMF3_NULL_MARKER
end

#write_object(obj, &block) ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 132

def write_object(obj, &block)
  @stream << AMF3_OBJECT_MARKER
  if @object_cache[obj] != nil
    write_reference(@object_cache[obj])
  else
    # Cache object
    @object_cache.add_obj(obj)

    # Always serialize things as dynamic objects
    @stream << AMF3_DYNAMIC_OBJECT

    if obj.is_a?(Hash)
      @stream << AMF3_ANONYMOUS_OBJECT
      
      # Stringify keys to make it easier later on and allow sorting
      obj.each do |k,v| 
        write_utf8_vr(k.to_s)
        serialize(obj[k])
      end
    else
      # Write class name/anonymous
      class_name = AMF::ClassMapper.get_as_class_name(obj)
      if class_name
        write_utf8_vr(class_name)
      else
        @stream << AMF3_ANONYMOUS_OBJECT
      end
    
      @serializable_names.sort.each do |name|
        write_utf8_vr(name.to_s.camelize(:lower))
        serialize(obj.send(name))
      end
    end

    block.call(self) if block_given?

    # Write close
    @stream << AMF3_CLOSE_DYNAMIC_OBJECT
  end
end

#write_reference(index) ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 55

def write_reference index
  header = index << 1 # shift value left to leave a low bit of 0
  @stream << pack_integer(header)
end

#write_string(str) ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 86

def write_string(str)
  @stream << AMF3_STRING_MARKER
  write_utf8_vr(str)
end

#write_true ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 64

def write_true
  @stream << AMF3_TRUE_MARKER
end

#write_utf8_vr(str) ⇒ Object 



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# File 'lib/amf/pure/serializer.rb', line 173

def write_utf8_vr(str)
  if str == ''
    @stream << AMF3_EMPTY_STRING
  elsif @string_cache[str] != nil
    write_reference(@string_cache[str])
  else
    # Cache string
    @string_cache.add_obj(str)

    # Build AMF string
    header = str.length << 1 # make room for a low bit of 1
    header = header | 1 # set the low bit to 1
    @stream << pack_integer(header)
    @stream << str
  end
end