Class: Yomu

Inherits:
Object
  • Object
show all
Defined in:
lib/yomu.rb,
lib/yomu/version.rb

Constant Summary collapse

GEMPATH = 
File.dirname(File.dirname(__FILE__))
JARPATH = 
File.join(Yomu::GEMPATH, 'jar', 'tika-app-1.11.jar')
DEFAULT_SERVER_PORT =

an arbitrary, but perfectly cromulent, port

9293
VERSION = 
'0.2.4'
@@server_port = 
nil
@@server_pid = 
nil

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Yomu

Create a new instance of Yomu with a given document.

Using a file path:

Yomu.new 'sample.pages'

Using a URL:

Yomu.new 'http://svn.apache.org/repos/asf/poi/trunk/test-data/document/sample.docx'

From a stream or an object which responds to read

Yomu.new File.open('sample.pages')


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# File 'lib/yomu.rb', line 95

def initialize(input)
  if input.is_a? String
    if File.exists? input
      @path = input
    elsif input =~ URI::regexp
      @uri = URI.parse input
    else
      raise Errno::ENOENT.new "missing file or invalid URI - #{input}"
    end
  elsif input.respond_to? :read
    @stream = input
  else
    raise TypeError.new "can't read from #{input.class.name}"
  end
end

Class Method Details

._client_read(type, data) ⇒ Object 


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# File 'lib/yomu.rb', line 39

def self._client_read(type, data)
  switch = case type
  when :text
    '-t'
  when :html
    '-h'
  when :metadata
    '-m -j'
  when :mimetype
    '-m -j'
  end

  IO.popen "#{java} -Djava.awt.headless=true -jar #{Yomu::JARPATH} #{switch}", 'r+' do |io|
    io.write data
    io.close_write
    io.read
  end
end

._server_read(_, data) ⇒ Object 


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# File 'lib/yomu.rb', line 59

def self._server_read(_, data)
  s = TCPSocket.new('localhost', @@server_port)
  file = StringIO.new(data, 'r')

  while 1
    chunk = file.read(65536)
    break unless chunk
    s.write(chunk)
  end

  # tell Tika that we're done sending data
  s.shutdown(Socket::SHUT_WR)

  resp = ''
  while 1
    chunk = s.recv(65536)
    break if chunk.empty? || !chunk
    resp << chunk
  end
  resp
end

.kill_server! ⇒ Object

Kills server started by Yomu.server

Always run this when you're done, or else Tika might run until you kill it manually
You might try putting your extraction in a begin..rescue...ensure...end block and
  putting this method in the ensure block.

Yomu.server(:text)
reports = ["report1.docx", "report2.doc", "report3.pdf"]
begin
  my_texts = reports.map{|report_path| Yomu.new(report_path).text }
rescue
ensure
  Yomu.kill_server!
end


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# File 'lib/yomu.rb', line 256

def self.kill_server!
  if @@server_pid
    Process.kill('INT', @@server_pid)
    @@server_pid = nil
    @@server_port = nil
  end
end

.read(type, data) ⇒ Object

Read text or metadata from a data buffer.

data = File.read 'sample.pages'
text = Yomu.read :text, data
metadata = Yomu.read :metadata, data


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# File 'lib/yomu.rb', line 24

def self.read(type, data)
  result = @@server_pid ? self._server_read(type, data) : self._client_read(type, data)

  case type
  when :text
    result
  when :html
    result
  when :metadata
    JSON.parse(result)
  when :mimetype
    MIME::Types[JSON.parse(result)['Content-Type']].first
  end
end

.server(type, custom_port = nil) ⇒ Object

Returns pid of Tika server, started as a new spawned process.

type :html, :text or :metadata
custom_port e.g. 9293

Yomu.server(:text, 9294)


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# File 'lib/yomu.rb', line 223

def self.server(type, custom_port=nil)
  switch = case type
  when :text
    '-t'
  when :html
    '-h'
  when :metadata
    '-m -j'
  when :mimetype
    '-m -j'
  end

  @@server_port = custom_port || DEFAULT_SERVER_PORT
  
  @@server_pid = Process.spawn("#{java} -Djava.awt.headless=true -jar #{Yomu::JARPATH} --server --port #{@@server_port} #{switch}")
  sleep(2) # Give the server 2 seconds to spin up.
  @@server_pid
end

Instance Method Details

#creation_date ⇒ Object 


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# File 'lib/yomu.rb', line 164

def creation_date
  return @creation_date if defined? @creation_date
 
  if metadata['Creation-Date']
    @creation_date = Time.parse(metadata['Creation-Date'])
  else
    nil
  end
end

#data ⇒ Object

Returns the raw/unparsed content of the Yomu document.

yomu = Yomu.new 'sample.pages'
yomu.data


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# File 'lib/yomu.rb', line 202

def data
  return @data if defined? @data

  if path?
    @data = File.read @path
  elsif uri?
    @data = Net::HTTP.get @uri
  elsif stream?
    @data = @stream.read
  end

  @data
end

#html ⇒ Object

Returns the text content of the Yomu document in HTML.

yomu = Yomu.new 'sample.pages'
yomu.html


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# File 'lib/yomu.rb', line 127

def html
  return @html if defined? @html

  @html = Yomu.read :html, data
end

#metadata ⇒ Object

Returns the metadata hash of the Yomu document.

yomu = Yomu.new 'sample.pages'
yomu.metadata['Content-Type']


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# File 'lib/yomu.rb', line 138

def metadata
  return @metadata if defined? @metadata

  @metadata = Yomu.read :metadata, data
end

#mimetype ⇒ Object

Returns the mimetype object of the Yomu document.

yomu = Yomu.new 'sample.docx'
yomu.mimetype.content_type #=> 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
yomu.mimetype.extensions #=> ['docx']


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# File 'lib/yomu.rb', line 150

def mimetype
  return @mimetype if defined? @mimetype

  type = metadata["Content-Type"].is_a?(Array) ? metadata["Content-Type"].first : metadata["Content-Type"]
  
  @mimetype = MIME::Types[type].first
end

#path? ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/yomu.rb', line 174

def path?
  defined? @path
end

#stream? ⇒ Boolean

Returns true if the Yomu document was specified from a stream or an object which responds to read.

file = File.open('sample.pages')
yomu = Yomu.new file
yomu.stream? #=> true

Returns:

  • (Boolean) 

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# File 'lib/yomu.rb', line 193

def stream?
  defined? @stream
end

#text ⇒ Object

Returns the text content of the Yomu document.

yomu = Yomu.new 'sample.pages'
yomu.text


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# File 'lib/yomu.rb', line 116

def text
  return @text if defined? @text

  @text = Yomu.read :text, data
end

#uri? ⇒ Boolean

Returns true if the Yomu document was specified using a URI.

yomu = Yomu.new 'http://svn.apache.org/repos/asf/poi/trunk/test-data/document/sample.docx'
yomu.uri? #=> true

Returns:

  • (Boolean) 

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# File 'lib/yomu.rb', line 183

def uri?
  defined? @uri
end