Class: Dragonfly::TempObject
Overview
A TempObject is used for HOLDING DATA. It’s the thing that is passed between the datastore and the processor, and is useful for separating how the data was created and how it is later accessed.
You can initialize it various ways:
temp_object = Dragonfly::TempObject.new('this is the content') # with a String
temp_object = Dragonfly::TempObject.new(Pathname.new('path/to/content')) # with a Pathname
temp_object = Dragonfly::TempObject.new(File.new('path/to/content')) # with a File
temp_object = Dragonfly::TempObject.new(some_tempfile) # with a Tempfile
temp_object = Dragonfly::TempObject.new(some_other_temp_object) # with another TempObject
However, no matter how it was initialized, you can always access the data a number of ways:
temp_object.data # returns a data string
temp_object.file # returns a file object holding the data
temp_object.path # returns a path for the file
The data/file are created lazily, something which you may wish to take advantage of.
For example, if a TempObject is initialized with a file, and temp_object.data is never called, then the data string will never be loaded into memory.
Conversely, if the TempObject is initialized with a data string, and neither temp_object.file nor temp_object.path are ever called, then the filesystem will never be hit.
Defined Under Namespace
Classes: Closed
Instance Attribute Summary collapse
-
#name ⇒ Object
readonly
Returns the value of attribute name.
Instance Method Summary collapse
- #close ⇒ Object
- #closed? ⇒ Boolean
- #data ⇒ Object
- #each(&block) ⇒ Object
- #ext ⇒ Object
- #file(&block) ⇒ Object
-
#initialize(obj, name = nil) ⇒ TempObject
constructor
Instance Methods.
- #inspect ⇒ Object
- #path ⇒ Object
- #size ⇒ Object
- #to_file(path, opts = {}) ⇒ Object
- #to_io(&block) ⇒ Object
- #to_tempfile ⇒ Object
Constructor Details
#initialize(obj, name = nil) ⇒ TempObject
Instance Methods
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# File 'lib/dragonfly/temp_object.rb', line 42 def initialize(obj, name=nil) if obj.is_a? TempObject @data = obj.get_data @tempfile = obj.get_tempfile @pathname = obj.get_pathname elsif obj.is_a? String @data = obj elsif obj.is_a? Tempfile @tempfile = obj elsif obj.is_a? File @pathname = Pathname.new(obj.path) elsif obj.is_a? Pathname @pathname = obj elsif obj.respond_to?(:tempfile) @tempfile = obj.tempfile elsif obj.respond_to?(:path) # e.g. Rack::Test::UploadedFile @pathname = Pathname.new(obj.path) else raise ArgumentError, "#{self.class.name} must be initialized with a String, a Pathname, a File, a Tempfile, another TempObject, something that responds to .tempfile, or something that responds to .path - you gave #{obj.inspect}" end @tempfile.close if @tempfile # Name @name = if name name elsif obj.respond_to?(:original_filename) obj.original_filename elsif @pathname @pathname.basename.to_s end end |
Instance Attribute Details
#name ⇒ Object (readonly)
Returns the value of attribute name.
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# File 'lib/dragonfly/temp_object.rb', line 75 def name @name end |
Instance Method Details
#close ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 140 def close @tempfile.close! if @tempfile @data = nil @closed = true end |
#closed? ⇒ Boolean
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# File 'lib/dragonfly/temp_object.rb', line 146 def closed? !!@closed end |
#data ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 83 def data raise Closed, "can't read data as TempObject has been closed" if closed? @data ||= file{|f| f.read } end |
#each(&block) ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 110 def each(&block) to_io do |io| while part = io.read(block_size) yield part end end end |
#ext ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 77 def ext if n = name n.split('.').last end end |
#file(&block) ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 88 def file(&block) f = tempfile.open tempfile.binmode if block_given? ret = yield f tempfile.close unless tempfile.closed? else ret = f end ret end |
#inspect ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 150 def inspect content_string = case when @data data_string = size > 20 ? "#{@data[0..20]}..." : @data "data=#{data_string.inspect}" when @pathname then "pathname=#{@pathname.inspect}" when @tempfile then "tempfile=#{@tempfile.inspect}" end "<#{self.class.name} #{content_string} >" end |
#path ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 100 def path @pathname ? @pathname..to_s : tempfile.path end |
#size ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 104 def size @tempfile && @tempfile.size || @data && @data.bytesize || File.size(path) end |
#to_file(path, opts = {}) ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 118 def to_file(path, opts={}) mode = opts[:mode] || 0644 prepare_path(path) unless opts[:mkdirs] == false if @data File.open(path, 'wb', mode){|f| f.write(@data) } else FileUtils.cp(self.path, path) File.chmod(mode, path) end File.new(path, 'rb') end |
#to_io(&block) ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 136 def to_io(&block) @data ? StringIO.open(@data, 'rb', &block) : file(&block) end |
#to_tempfile ⇒ Object
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# File 'lib/dragonfly/temp_object.rb', line 130 def to_tempfile tempfile = copy_to_tempfile(path) tempfile.open tempfile end |