如何編組包含數組的Jruby中的類

Question

我有一個包含許多類的實例的2D數組。該類包含4個數組。我想用Marshal保存和加載二維數組到/從磁盤。我已經成功地將Marshal用於其他包含類的2D數組，但這些類不包含數組。這是班級給我帶來麻煩的定義。

class Light 
     attr_accessor :R,:G,:B,:A 

     def initialize(i) 

      @R = Array.new(4, i) 
      @G = Array.new(4, i) 
      @B = Array.new(4, i) 
      @A = Array.new(4, i) 

     end 

     @R 
     @G 
     @B 
     @A 

end 

我試圖確定在燈類我自己的名帥功能：

def marshal_dump 
    {'R' => @R,'G' => @G,'B' => @B,'A' => @A} 
end 


def marshal_load(data) 
    self.R = data['R'] 
    self.G = data['G'] 
    self.B = data['B'] 
    self.A = data['A'] 
end 

下面是一個包含此類

def createLightMap(width,height) 
    a = Array.new(width) { Light.new(0.7) } 
    a.map! { Array.new(height) { Light.new(0.7) } } 
    return a 
end 

@lightMap = createLightMap(10,10) 

這裏的二維數組的創建是我如何保存和負載

#save 
File.open('lightData','w') do |file| 
    Marshal.dump(@lightMap, file) 
end 

#load 
@lightMap = if File.exists?('lightData') 
        File.open('lightData','w') do |file| 
         Marshal.load(file) 
        end 
      else 
        puts 'no light data found' 
      end 

加載時，我收到錯誤「in'加載'：轉儲格式錯誤（未鏈接，索引：-96）（參數錯誤）」

我試過了，沒有自定義轉儲/加載編組函數。我使用jruby 1.5.1，紅寶石1.8.7

Answer 1

我不認爲這是元帥轉儲/負載是問題，它可能只是文件I/O。這對我很好（沒有自定義封送）：

class Light 
    # You might want to downcase these variables as capitalized 
    # variables in Ruby generally denote constants 
    attr_accessor :R,:G,:B,:A 

    def initialize(i) 
    @R = Array.new(4, i) 
    @G = Array.new(4, i) 
    @B = Array.new(4, i) 
    @A = Array.new(4, i) 
    end 

    def ==(other) 
    @R == other.R && @G == other.G && @B == other.B && @A == other.A 
    end 
end 

# Method names are generally underscored/snake cased 
# (JRuby is even smart enough to map this to Java's camel casing). 
# Also should probably attach this method to a class or module to prevent 
# polluting global namespace 
def create_light_map(width,height) 
    a = Array.new(width) { Light.new(0.7) } 
    # Note you don't need explicit returns - the last value evaluated is the return value 
    a.map { Array.new(height) { Light.new(0.7) } } # You can also lose the ! on map 
end 

# Same casing style applies to variables 
light_map = create_light_map(10,10) 
# => [[#<Light:0x5ec736e4 @A=[0.7, 0.7, 0.7, 0.7], ... 

# Note with marshaled data you should probably open file in binary mode 
File.open('/tmp/lightData','wb') { |f| f.write(Marshal.dump(light_map)) } 
# => 5240 

light_map_demarshaled = File.open('/tmp/lightData','rb') { |f| Marshal.load(f.read) } 
# => [[#<Light:0x6a2d0483 @A=[0.7, 0.7, 0.7, 0.7], ... 

light_map_demarshaled == light_map 
# => true