# -*- encoding : utf-8 -*-
########################################################
## Thoughts from reading the ISO 32000-1:2008
## this file is part of the CombinePDF library and the code
## is subject to the same license.
########################################################
module CombinePDF
# PDF class is the PDF object that can save itself to
# a file and that can be used as a container for a full
# PDF file data, including version, information etc'.
#
# PDF objects can be used to combine or to inject data.
# == Combine/Merge PDF files or Pages
# To combine PDF files (or data):
# pdf = CombinePDF.new
# pdf << CombinePDF.new("file1.pdf") # one way to combine, very fast.
# pdf << CombinePDF.new("file2.pdf")
# pdf.save "combined.pdf"
# or even a one liner:
# (CombinePDF.new("file1.pdf") << CombinePDF.new("file2.pdf") << CombinePDF.new("file3.pdf")).save("combined.pdf")
# you can also add just odd or even pages:
# pdf = CombinePDF.new
# i = 0
# CombinePDF.new("file.pdf").pages.each do |page|
# i += 1
# pdf << page if i.even?
# end
# pdf.save "even_pages.pdf"
# notice that adding all the pages one by one is slower then adding the whole file.
# == Add content to existing pages (Stamp / Watermark)
# To add content to existing PDF pages, first import the new content from an existing PDF file.
# after that, add the content to each of the pages in your existing PDF.
#
# in this example, we will add a company logo to each page:
# company_logo = CombinePDF.new("company_logo.pdf").pages[0]
# pdf = CombinePDF.new "content_file.pdf"
# pdf.pages.each {|page| page << company_logo} # notice the << operator is on a page and not a PDF object.
# pdf.save "content_with_logo.pdf"
# Notice the << operator is on a page and not a PDF object. The << operator acts differently on PDF objects and on Pages.
#
# The << operator defaults to secure injection by renaming references to avoid conflics. For overlaying pages using compressed data that might not be editable (due to limited filter support), you can use:
# pdf.pages(nil, false).each {|page| page << stamp_page}
#
# == Page Numbering
# adding page numbers to a PDF object or file is as simple as can be:
# pdf = CombinePDF.new "file_to_number.pdf"
# pdf.number_pages
# pdf.save "file_with_numbering.pdf"
#
# numbering can be done with many different options, with different formating, with or without a box object, and even with opacity values.
#
# == Loading PDF data
# Loading PDF data can be done from file system or directly from the memory.
#
# Loading data from a file is easy:
# pdf = CombinePDF.new("file.pdf")
# you can also parse PDF files from memory:
# pdf_data = IO.read 'file.pdf' # for this demo, load a file to memory
# pdf = CombinePDF.parse(pdf_data)
# Loading from the memory is especially effective for importing PDF data recieved through the internet or from a different authoring library such as Prawn.
class PDF
# the objects attribute is an Array containing all the PDF sub-objects for te class.
attr_reader :objects
# the info attribute is a Hash that sets the Info data for the PDF.
# use, for example:
# pdf.info[:Title] = "title"
attr_reader :info
# gets/sets the string output format (PDF files store strings in to type of formats).
#
# Accepts:
# - :literal
# - :hex
attr_accessor :string_output
# set/get the PDF version of the file (1.1-1.7) - shuold be type Float.
attr_accessor :version
def initialize (*args)
# default before setting
@objects = []
@version = 0
@info = {}
if args[0].is_a? PDFParser
@objects = args[0].parse
# connecting references with original objects
serialize_objects_and_references
# make sure there is only one Catalog (the latest Catalog)
if args[0].root_object[:Root]
@objects.delete_if {|obj| obj[:Type] == :Catalog}
@objects << args[0].root_object[:Root]
else
last_calalog = (@objects.select {|obj| obj[:Type] == :Catalog}).last
unless last_calalog.nil?
@objects.delete_if {|obj| obj[:Type] == :Catalog}
@objects << last_calalog
end
end
@version = args[0].version if args[0].version.is_a? Float
@info = args[0].info_object || {}
elsif args[0].is_a? Array
# object initialization
@objects = args[0]
@version = args[1] if args[1].is_a? Float
# connecting references with original objects
serialize_objects_and_references
elsif args[0].is_a? Hash
@objects = args
# connecting references with original objects
serialize_objects_and_references
end
# general globals
@string_output = :literal
@need_to_rebuild_resources = false
@set_start_id = 1
@info[:Producer] = "Ruby CombinePDF Library by Boaz Segev"
@info.delete :CreationDate
@info.delete :ModDate
warn "finished to initialize PDF object."
end
# Formats the data to PDF formats and returns a binary string that represents the PDF file content.
#
# This method is used by the save(file_name) method to save the content to a file.
#
# use this to export the PDF file without saving to disk (such as sending through HTTP ect').
def to_pdf
#reset version if not specified
@version = 1.5 if @version.to_f == 0.0
#set creation date for merged file
@info[:CreationDate] = Time.now.strftime "D:%Y%m%d%H%M%S%:::z'00"
#rebuild resources if needed
if @need_to_rebuild_resources
rebuild_resources
end
catalog = rebuild_catalog_and_objects #rebuild_catalog
warn "Formatting PDF output"
out = []
xref = []
indirect_object_count = 1 #the first object is the null object
#write head (version and binanry-code)
out << "%PDF-#{@version.to_s}\n%\x00\x00\x00\x00".force_encoding(Encoding::ASCII_8BIT)
#collect objects and set xref table locations
loc = 0
out.each {|line| loc += line.bytes.length + 1}
@objects.each do |o|
indirect_object_count += 1
xref << loc
out << PDFOperations._object_to_pdf(o)
loc += out.last.length + 1
end
warn "Building XREF"
xref_location = 0
out.each { |line| xref_location += line.bytes.length + 1}
out << "xref\n\r0 #{(indirect_object_count).to_s}\n\r0000000000 65535 f \n\r"
xref.each {|offset| out << ( out.pop + ("%010d 00000 n \n\r" % offset) ) }
out << out.pop + "trailer"
out << "<<\n/Root #{false || "#{catalog[:indirect_reference_id]} #{catalog[:indirect_generation_number]} R"}"
out << "/Size #{indirect_object_count.to_s}"
if @info.is_a?(Hash)
PRIVATE_HASH_KEYS.each {|key| @info.delete key} # make sure the dictionary is rendered inline, without stream
out << "/Info #{PDFOperations._object_to_pdf @info}"
end
out << ">>\nstartxref\n#{xref_location.to_s}\n%%EOF"
# when finished, remove the numbering system and keep only pointers
PDFOperations.remove_old_ids @objects
# output the pdf stream
out.join("\n").force_encoding(Encoding::ASCII_8BIT)
end
# Save the PDF to file.
#
# file_name:: is a string or path object for the output.
#
# Notice! if the file exists, it WILL be overwritten.
def save(file_name)
IO.binwrite file_name, to_pdf
end
# this method returns all the pages cataloged in the catalog.
#
# if no catalog is passed, it seeks the existing catalog(s) and searches
# for any registered Page objects.
#
# This method also adds the << operator to each page instance, so that content can be
# injected to the pages, as described above.
#
# if the secure_injection is false, then the << operator will not alter the any of the information added to the page.
# this might cause conflicts in the added content, but is available for situations in which
# the content added is compressed using unsupported filters or options.
#
# the default is for the << operator to attempt a secure copy, by attempting to rename the content references and avoiding conflicts.
# because not all PDF files are created equal (some might have formating errors or variations),
# it is imposiible to learn if the attempt was successful.
#
# (page objects are Hash class objects. the << operator is added to the specific instances without changing the class)
#
# catalogs:: a catalog, or an Array of catalog objects. defaults to the existing catalog.
# secure_injection:: a boolean (true / false) controling the behavior of the << operator.
def pages(catalogs = nil, secure_injection = true)
page_list = []
if catalogs == nil
catalogs = @objects.select {|obj| obj.is_a?(Hash) && obj[:Type] == :Catalog}
catalogs ||= []
end
case
when catalogs.is_a?(Array)
catalogs.each {|c| page_list.push *(pages(c)) unless c.nil?}
when catalogs.is_a?(Hash)
if catalogs[:is_reference_only]
catalogs[:referenced_object] = pages(PDFOperations.get_refernced_object @objects, catalogs) unless catalogs[:referenced_object]
if catalogs[:referenced_object]
page_list.push *( pages(catalogs[:referenced_object]) )
else
warn "couldn't follow reference!!! #{catalogs} not found!"
end
else
case catalogs[:Type]
when :Page
holder = self
if secure_injection
catalogs.define_singleton_method("<<".to_sym) do |obj|
obj = PDFOperations.copy_and_secure_for_injection obj
PDFOperations.inject_to_page self, obj
holder.add_referenced self # add new referenced objects
self
end
else
catalogs.define_singleton_method("<<".to_sym) do |obj|
obj = PDFOperations.create_deep_copy obj
PDFOperations.inject_to_page self, obj
holder.add_referenced self # add new referenced objects
self
end
end
catalogs[:MediaBox] ||= catalogs[:Parent][:referenced_object][:MediaBox] if catalogs[:Parent].is_a?(Hash) && catalogs[:Parent][:referenced_object].is_a?(Hash) && catalogs[:Parent][:referenced_object][:MediaBox]
catalogs[:CropBox] ||= catalogs[:Parent][:referenced_object][:CropBox] if catalogs[:CropBox].is_a?(Hash) && catalogs[:CropBox][:referenced_object].is_a?(Hash) && catalogs[:Parent][:referenced_object][:CropBox]
catalogs[:MediaBox] = catalogs[:MediaBox][:referenced_object][:indirect_without_dictionary] if catalogs[:MediaBox].is_a?(Hash) && catalogs[:MediaBox][:referenced_object].is_a?(Hash) && catalogs[:MediaBox][:referenced_object][:indirect_without_dictionary]
catalogs[:CropBox] = catalogs[:CropBox][:referenced_object][:indirect_without_dictionary] if catalogs[:CropBox].is_a?(Hash) && catalogs[:CropBox][:referenced_object].is_a?(Hash) && catalogs[:CropBox][:referenced_object][:indirect_without_dictionary]
page_list << catalogs
when :Pages
page_list.push *(pages(catalogs[:Kids])) unless catalogs[:Kids].nil?
when :Catalog
page_list.push *(pages(catalogs[:Pages])) unless catalogs[:Pages].nil?
end
end
end
page_list
end
# returns an array with the different fonts used in the file.
#
# Type0 font objects ( "font[:Subtype] == :Type0" ) can be registered with the font library
# for use in PDFWriter objects (font numbering / table creation etc').
# @param limit_to_type0 [true,false] limits the list to type0 fonts.
def fonts(limit_to_type0 = false)
fonts_array = []
pages.each do |p|
p[:Resources][:Font].values.each do |f|
f = f[:referenced_object] if f[:referenced_object]
if (limit_to_type0 || f[:Subtype] = :Type0) && f[:Type] == :Font && !fonts_array.include?(f)
fonts_array << f
end
end
end
fonts_array
end
# add the pages (or file) to the PDF (combine/merge) and return the new pages array.
# for example:
#
# pdf = CombinePDF.new "first_file.pdf"
#
# pdf << CombinePDF.new "second_file.pdf"
#
# pdf.save "both_files_merged.pdf"
# data:: is PDF page (Hash), and Array of PDF pages or a parsed PDF object to be added.
def << (data)
#########
## how should we add data to PDF?
## and how to handles imported pages?
if data.is_a?(PDF)
@version = [@version, data.version].max
@need_to_rebuild_resources = true
@objects.push(*data.objects)
# rebuild_catalog
return rebuild_catalog[:Pages][:referenced_object][:Kids]
end
insert -1, data
end
# add the pages (or file) to the BEGINNING of the PDF (combine/merge) and return the new pages array.
# for example:
#
# pdf = CombinePDF.new "second_file.pdf"
#
# pdf >> CombinePDF.new "first_file.pdf"
#
# pdf.save "both_files_merged.pdf"
# data:: is PDF page (Hash), and Array of PDF pages or a parsed PDF object to be added.
def >> (data)
insert 0, data
end
# add PDF pages (or PDF files) into a specific location.
#
# returns the new pages Array
#
# location:: the location for the added page(s). Could be any number. negative numbers represent a count backwards (-1 being the end of the page array and 0 being the begining). if the location is beyond bounds, the pages will be added to the end of the PDF object (or at the begining, if the out of bounds was a negative number).
# data:: a PDF page, a PDF file (CombinePDF.new "filname.pdf") or an array of pages (CombinePDF.new("filname.pdf").pages[0..3]).
def insert(location, data)
pages_to_add = nil
if data.is_a? PDF
pages_to_add = data.pages
elsif data.is_a?(Array) && (data.select {|o| !(o.is_a?(Hash) && o[:Type] == :Page) } ).empty?
pages_to_add = data
elsif data.is_a?(Hash) && data[:Type] == :Page
pages_to_add = [data]
else
warn "Shouldn't add objects to the file unless they are PDF objects or PDF pages (an Array or a single PDF page)."
retrun false # return false, which will also stop any chaining.
end
catalog = rebuild_catalog
pages_array = catalog[:Pages][:referenced_object][:Kids]
page_count = pages_array.length
if location < 0 && (page_count + location < 0 )
location = 0
elsif location > 0 && (location > page_count)
location = page_count
end
pages_array.insert location, pages_to_add
pages_array
end
# add page numbers to the PDF
#
# For unicode text, a unicode font(s) must first be registered. the registered font(s) must supply the
# subset of characters used in the text. UNICODE IS AN ISSUE WITH THE PDF FORMAT - USE CAUSION.
#
# options:: a Hash of options setting the behavior and format of the page numbers:
# - :number_format a string representing the format for page number. defaults to ' - %s - ' (allows for letter numbering as well, such as "a", "b"...).
# - :number_location an Array containing the location for the page numbers, can be :top, :buttom, :top_left, :top_right, :bottom_left, :bottom_right. defaults to [:top, :buttom].
# - :start_at a Fixnum that sets the number for first page number. also accepts a letter ("a") for letter numbering. defaults to 1.
# - :margin_from_height a number (PDF points) for the top and buttom margins. defaults to 45.
# - :margin_from_side a number (PDF points) for the left and right margins. defaults to 15.
# the options Hash can also take all the options for PDFWriter.textbox.
# defaults to font: :Helvetica, font_size: 12 and no box (:border_width => 0, :box_color => nil).
def number_pages(options = {})
opt = {
number_format: ' - %s - ',
number_location: [:top, :bottom],
start_at: 1,
font_size: 12,
font: :Helvetica,
margin_from_height: 45,
margin_from_side: 15
}
opt.update options
page_number = opt[:start_at]
pages.each do |page|
# create a "stamp" PDF page with the same size as the target page
mediabox = page[:CropBox] || page[:MediaBox] || [0, 0, 595.3, 841.9]
stamp = PDFWriter.new mediabox
# set stamp text
text = opt[:number_format] % page_number
# compute locations for text boxes
text_dimantions = stamp.dimensions_of( text, opt[:font], opt[:font_size] )
box_width = text_dimantions[0] * 1.2
box_height = text_dimantions[1] * 2
opt[:width] = box_width
opt[:height] = box_height
from_height = 45
from_side = 15
page_width = mediabox[2]
page_height = mediabox[3]
center_position = (page_width - box_width)/2
left_position = from_side
right_position = page_width - from_side - box_width
top_position = page_height - from_height
buttom_position = from_height + box_height
x = center_position
y = top_position
if opt[:number_location].include? :top
stamp.textbox text, {x: x, y: y }.merge(opt)
end
y = buttom_position #bottom position
if opt[:number_location].include? :bottom
stamp.textbox text, {x: x, y: y }.merge(opt)
end
y = top_position #top position
x = left_position # left posotion
if opt[:number_location].include? :top_left
stamp.textbox text, {x: x, y: y }.merge(opt)
end
y = buttom_position #bottom position
if opt[:number_location].include? :bottom_left
stamp.textbox text, {x: x, y: y }.merge(opt)
end
x = right_position # right posotion
y = top_position #top position
if opt[:number_location].include? :top_right
stamp.textbox text, {x: x, y: y }.merge(opt)
end
y = buttom_position #bottom position
if opt[:number_location].include? :bottom_right
stamp.textbox text, {x: x, y: y }.merge(opt)
end
page << stamp
page_number = page_number.succ
end
end
# get the title for the pdf
# The title is stored in the information dictionary and isn't required
def title
return @info[:Title]
end
# set the title for the pdf
# The title is stored in the information dictionary and isn't required
# new_title:: a string that is the new author value.
def title=(new_title = nil)
@info[:Title] = new_title
end
# get the author value for the pdf.
# The author is stored in the information dictionary and isn't required
def author
return @info[:Author]
end
# set the author value for the pdf.
# The author is stored in the information dictionary and isn't required
#
# new_title:: a string that is the new author value.
def author=(new_author = nil)
@info[:Author] = new_author
end
end
#:nodoc: all
class PDF
# @private
# Some PDF objects contain references to other PDF objects.
#
# this function adds the references contained in "object", but DOESN'T add the object itself.
#
# this is used for internal operations, such as injectng data using the << operator.
def add_referenced(object)
# add references but not root
case
when object.is_a?(Array)
object.each {|it| add_referenced(it)}
when object.is_a?(Hash)
if object[:is_reference_only] && object[:referenced_object]
found_at = @objects.find_index object[:referenced_object]
if found_at
#if the objects are equal, they might still be different objects!
# so, we need to make sure they are the same object for the pointers to effect id numbering
# and formatting operations.
object[:referenced_object] = @objects[found_at]
else @objects.include? object[:referenced_object]
#the object wasn't found - add it to the @objects array
@objects << object[:referenced_object]
object[:referenced_object].each do |k, v|
add_referenced(v) unless k == :Parent
end
end
else
object.each do |k, v|
add_referenced(v) unless k == :Parent
end
end
end
end
# @private
# run block of code on evey PDF object (PDF objects are class Hash)
def each_object(&block)
PDFOperations._each_object(@objects, &block)
end
protected
# @private
# this function returns all the Page objects - regardless of order and even if not cataloged
# could be used for finding "lost" pages... but actually rather useless.
def all_pages
#########
## Only return the page item, but make sure all references are connected so that
## referenced items and be reached through the connections.
[].tap {|out| each_object {|obj| out << obj if obj.is_a?(Hash) && obj[:Type] == :Page } }
end
# @private
def serialize_objects_and_references(object = nil)
warn "connecting objects with their references (serialize_objects_and_references)."
# # Version 3.5 injects indirect objects if they arn't dictionaries.
# # benchmark 1000.times was 3.568246 sec for pdf = CombinePDF.new "/Users/2Be/Desktop/מוצגים/20121002\ הודעת\ הערעור.pdf" }
# # puts Benchmark.measure { 1000.times {pdf.serialize_objects_and_references} }
# # ######### Intreduces a BUG with catalogging pages... why? I don't know... mybey doesn't catch all.
# each_object do |obj|
# obj.each do |k, v|
# if v.is_a?(Hash) && v[:is_reference_only]
# v[:referenced_object] = PDFOperations.get_refernced_object @objects, v
# raise "couldn't connect references" unless v[:referenced_object]
# obj[k] = v[:referenced_object][:indirect_without_dictionary] if v[:referenced_object][:indirect_without_dictionary]
# end
# end
# end
# Version 4
# benchmark 1000.times was 0.980651 sec for:
# pdf = CombinePDF.new "/Users/2Be/Desktop/מוצגים/20121002\ הודעת\ הערעור.pdf"
# puts Benchmark.measure { 1000.times {pdf.serialize_objects_and_references} }
objects_reference_hash = {}
@objects.each {|o| objects_reference_hash[ [o[:indirect_reference_id], o[:indirect_generation_number] ] ] = o }
each_object do |obj|
if obj[:is_reference_only]
obj[:referenced_object] = objects_reference_hash[ [obj[:indirect_reference_id], obj[:indirect_generation_number] ] ]
warn "couldn't connect a reference!!! could be a null object, Silent error!!!" unless obj[:referenced_object]
end
end
# when finished, remove the old numbering system and keep only pointers
PDFOperations.remove_old_ids @objects
# # Version 3
# # benchmark 1000.times was 3.568246 sec for pdf = CombinePDF.new "/Users/2Be/Desktop/מוצגים/20121002\ הודעת\ הערעור.pdf" }
# # puts Benchmark.measure { 1000.times {pdf.serialize_objects_and_references} }
# each_object do |obj|
# if obj[:is_reference_only]
# obj[:referenced_object] = PDFOperations.get_refernced_object @objects, obj
# warn "couldn't connect a reference!!! could be a null object, Silent error!!!" unless obj[:referenced_object]
# end
# end
end
# @private
def renumber_object_ids(start = nil)
warn "Resetting Object Reference IDs"
@set_start_id = start || @set_start_id
start = @set_start_id
history = {}
all_indirect_object.each do |obj|
obj[:indirect_reference_id] = start
start += 1
end
warn "Finished serializing IDs"
end
# @private
def references(indirect_reference_id = nil, indirect_generation_number = nil)
ref = {indirect_reference_id: indirect_reference_id, indirect_generation_number: indirect_generation_number}
out = []
each_object do |obj|
if obj[:is_reference_only]
if (indirect_reference_id == nil && indirect_generation_number == nil)
out << obj
elsif compare_reference_values(ref, obj)
out << obj
end
end
end
out
end
# @private
def all_indirect_object
# [].tap {|out| @objects.each {|obj| out << obj if (obj.is_a?(Hash) && obj[:is_reference_only].nil?) } }
@objects
end
# @private
def sort_objects_by_id
@objects.sort! do |a,b|
if a.is_a?(Hash) && a[:indirect_reference_id] && a[:is_reference_only].nil? && b.is_a?(Hash) && b[:indirect_reference_id] && b[:is_reference_only].nil?
return a[:indirect_reference_id] <=> b[:indirect_reference_id]
end
0
end
end
# @private
def rebuild_catalog(*with_pages)
warn "Re-Building Catalog"
# # build page list v.1 Slow but WORKS
# # Benchmark testing value: 26.708394
# old_catalogs = @objects.select {|obj| obj.is_a?(Hash) && obj[:Type] == :Catalog}
# old_catalogs ||= []
# page_list = []
# PDFOperations._each_object(old_catalogs,false) { |p| page_list << p if p.is_a?(Hash) && p[:Type] == :Page }
# build page list v.2 faster, better, and works
# Benchmark testing value: 0.215114
page_list = pages
# add pages to catalog, if requested
page_list.push(*with_pages) unless with_pages.empty?
# build new Pages object
pages_object = {Type: :Pages, Count: page_list.length, Kids: page_list.map {|p| {referenced_object: p, is_reference_only: true} } }
# build new Catalog object
catalog_object = {Type: :Catalog, Pages: {referenced_object: pages_object, is_reference_only: true} }
# point old Pages pointers to new Pages object
## first point known pages objects - enough?
pages.each {|p| p[:Parent] = { referenced_object: pages_object, is_reference_only: true} }
## or should we, go over structure? (fails)
# each_object {|obj| obj[:Parent][:referenced_object] = pages_object if obj.is_a?(Hash) && obj[:Parent].is_a?(Hash) && obj[:Parent][:referenced_object] && obj[:Parent][:referenced_object][:Type] == :Pages}
# remove old catalog and pages objects
@objects.reject! {|obj| obj.is_a?(Hash) && (obj[:Type] == :Catalog || obj[:Type] == :Pages) }
# inject new catalog and pages objects
@objects << pages_object
@objects << catalog_object
catalog_object
end
# @private
# this is an alternative to the rebuild_catalog catalog method
# this method is used by the to_pdf method, for streamlining the PDF output.
# there is no point is calling the method before preparing the output.
def rebuild_catalog_and_objects
catalog = rebuild_catalog
@objects = []
@objects << catalog
add_referenced catalog
renumber_object_ids
catalog
end
# @private
# disabled, don't use. simpley returns true.
def rebuild_resources
warn "Resources re-building disabled as it isn't worth the price in peformance as of yet."
return true
warn "Re-Building Resources"
@need_to_rebuild_resources = false
# what are resources?
# anything at the top level of the file exept catalogs, page lists (Pages) and pages...
not_resources = [:Catalog, :Pages, :Page]
# get old resources list
old_resources = @objects.select {|obj| obj.is_a?(Hash) && !not_resources.include?(obj[:Type])}
# collect all unique resources while ignoring double values and resetting references
# also ignore inner values (canot use PRIVATE_HASH_KEYS because of stream and other issues)
ignore_keys = [:indirect_reference_id, :indirect_generation_number, :is_reference_only, :referenced_object]
new_resources = []
all_references = references
old_resources.each do |old_r|
add = true
new_resources.each do |new_r|
# ## v.1.0 - slower
# if (old_r.reject {|k,v| ignore_keys.include?(k) }) == (new_r.reject {|k,v| ignore_keys.include?(k)})
# all_references.each {|ref| ref[:referenced_object] = new_r if ref[:referenced_object].object_id == old_r.object_id } # fails, but doesn't assume all references are connected: compare_reference_values(old_r, ref) }
# add = false
# end
## v.1.1 - faster, doesn't build two hashes (but iterates one)
if ( [].tap {|out| old_r.each {|k,v| out << true unless ((!ignore_keys.include?(k)) && new_r[k] == v) } } .empty?)
all_references.each {|ref| ref[:referenced_object] = new_r if ref[:referenced_object].object_id == old_r.object_id } # fails, but doesn't assume all references are connected: compare_reference_values(old_r, ref) }
add = false
end
end
new_resources << old_r if add
end
# remove old resources
@objects.reject! {|obj| old_resources.include?(obj)}
# insert new resources
@objects.push *new_resources
# rebuild stream lengths?
end
# @private
# the function rerturns true if the reference belongs to the object
def compare_reference_values(obj, ref)
if obj[:referenced_object] && ref[:referenced_object]
return (obj[:referenced_object][:indirect_reference_id] == ref[:referenced_object][:indirect_reference_id] && obj[:referenced_object][:indirect_generation_number] == ref[:referenced_object][:indirect_generation_number])
elsif ref[:referenced_object]
return (obj[:indirect_reference_id] == ref[:referenced_object][:indirect_reference_id] && obj[:indirect_generation_number] == ref[:referenced_object][:indirect_generation_number])
elsif obj[:referenced_object]
return (obj[:referenced_object][:indirect_reference_id] == ref[:indirect_reference_id] && obj[:referenced_object][:indirect_generation_number] == ref[:indirect_generation_number])
else
return (obj[:indirect_reference_id] == ref[:indirect_reference_id] && obj[:indirect_generation_number] == ref[:indirect_generation_number])
end
end
end
end