Class: RobustExcelOle::Bookstore

Inherits:
REOCommon show all
Defined in:
lib/robust_excel_ole/bookstore.rb

Instance Method Summary collapse

Methods inherited from REOCommon

#excel, #own_methods, puts_hash, tr1, trace

Constructor Details

#initialize ⇒ Bookstore

Returns a new instance of Bookstore.



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# File 'lib/robust_excel_ole/bookstore.rb', line 8

def initialize
  @filename2books ||= Hash.new {|hash, key| hash[key] = [] }
  @hidden_excel_instance = nil
end

Instance Method Details

#books ⇒ Object

returns all stored books



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# File 'lib/robust_excel_ole/bookstore.rb', line 83

def books
  result = []
  if @filename2books
    @filename2books.each do |filename,books|
      unless books.empty? 
        books.each do |wr_book|
          result << wr_book.__getobj__ if wr_book.weakref_alive?
        end
      end
    end      
  end
  result
end

#fetch(filename, options = {:prefer_writable => true }) ⇒ Object

returns a book with the given filename, if it was open once prefers open books to closed books, and among them, prefers more recently opened books excludes hidden Excel instance options: :prefer_writable returns the writable book, if it is open (default: true)

                   otherwise returns the book according to the preference order mentioned above
:prefer_excel      returns the book in the given Excel instance, if it exists,
                   otherwise proceeds according to prefer_writable

Parameters:

  • filename (String) —

    the file name

  • options (Hash) (defaults to: {:prefer_writable => true }) —

    the options

  • option (Hash) —

    a customizable set of options



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# File 'lib/robust_excel_ole/bookstore.rb', line 24

def fetch(filename, options = {:prefer_writable => true })
  return nil unless filename
  filename = General::absolute_path(filename)
  filename_key = General::canonize(filename)
  weakref_books = @filename2books[filename_key]
  return nil unless weakref_books
  result = open_book = closed_book = nil      
  weakref_books = weakref_books.map {|wr_book| wr_book if wr_book.weakref_alive? }.compact
  @filename2books[filename_key] = weakref_books
  weakref_books.each do |wr_book|
    if (not wr_book.weakref_alive?)
      #trace "warn: this should never happen"
      begin 
        @filename2books[filename_key].delete(wr_book)
      rescue 
        #trace "#{$!.message}"
        #trace "Warning: deleting dead reference failed: file: #{filename.inspect}"
      end
    else
      book = wr_book.__getobj__
      next if book.excel == try_hidden_excel
      if options[:prefer_excel] && book.excel == options[:prefer_excel]
        result = book
        break 
      end
      if book.alive?
        open_book = book
        break if (book.writable && options[:prefer_writable])
      else
        closed_book = book
      end
    end
  end
  result = result ? result : (open_book ? open_book : closed_book)
  result if result
end

#hidden_excel ⇒ Object

creates and returns a separate Excel instance with Visible and DisplayAlerts equal false



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# File 'lib/robust_excel_ole/bookstore.rb', line 75

def hidden_excel  
  unless (@hidden_excel_instance &&  @hidden_excel_instance.weakref_alive? && @hidden_excel_instance.__getobj__.alive?)       
    @hidden_excel_instance = WeakRef.new(Excel.create) 
  end
  @hidden_excel_instance.__getobj__
end

#print ⇒ Object

prints the book store



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# File 'lib/robust_excel_ole/bookstore.rb', line 106

def print             
  #trace "@filename2books:"
  if @filename2books
    @filename2books.each do |filename,books|
      #trace " filename: #{filename}"
      #trace " books:"
      if books.empty? 
        #trace " []" 
      else
        books.each do |book|
          if book.weakref_alive?
            #trace "#{book}"
          else # this should never happen
            #trace "weakref not alive"
          end
        end
      end
    end
  end
end

#store(book) ⇒ Object

stores a workbook

Parameters:

  • book (Book) —

    a given book



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# File 'lib/robust_excel_ole/bookstore.rb', line 63

def store(book)
  filename_key = General::canonize(book.filename)      
  if book.stored_filename
    old_filename_key = General::canonize(book.stored_filename)
    # deletes the weak reference to the book
    @filename2books[old_filename_key].delete(book)
  end
  @filename2books[filename_key] |= [WeakRef.new(book)]
  book.stored_filename = book.filename
end