Text::PDF::Objind(3) User Contributed Perl Documentation Text::PDF::Objind(3)NAMEText::PDF::Objind - PDF indirect object reference. Also acts as an
abstract superclass for all elements in a PDF file.
INSTANCE VARIABLES
Instance variables differ from content variables in that they all start
with a space.
parent
For an object which is a reference to an object in some source,
this holds the reference to the source object, so that should the
reference have to be de-referenced, then we know where to go and
get the info.
objnum (R)
The object number in the source (only for object references)
objgen (R)
The object generation in the source
There are other instance variables which are used by the parent for
file control.
isfree
This marks whether the object is in the free list and available for
re-use as another object elsewhere in the file.
nextfree
Holds a direct reference to the next free object in the free list.
METHODS
Text::PDF::Objind->new()
Creates a new indirect object
uid
Returns a Unique id for this object, creating one if it didn't have one
before
$r->release
Releases ALL of the memory used by this indirect object, and all of its
component/child objects. This method is called automatically by
'"Text::PDF::File->release"' (so you don't have to call it yourself).
NOTE, that it is important that this method get called at some point
prior to the actual destruction of the object. Internally, PDF files
have an enormous amount of cross-references and this causes circular
references within our own internal data structures. Calling
'"release()"' forces these circular references to be cleaned up and the
entire internal data structure purged.
Developer note: As part of the brute-force cleanup done here, this
method will throw a warning message whenever unexpected key values are
found within the "Text::PDF::Objind" object. This is done to help
ensure that unexpected and unfreed values are brought to your
attention, so you can bug us to keep the module updated properly;
otherwise the potential for memory leaks due to dangling circular
references will exist.
$r->val
Returns the val of this object or reads the object and then returns its
value.
Note that all direct subclasses *must* make their own versions of this
subroutine otherwise we could be in for a very deep loop!
$r->realise
Makes sure that the object is fully read in, etc.
$r->outobjdeep($fh, $pdf)
If you really want to output this object, then you must need to read it
first. This also means that all direct subclasses must subclass this
method or loop forever!
$r->outobj($fh)
If this is a full object then outputs a reference to the object,
otherwise calls outobjdeep to output the contents of the object at this
point.
$r->elementsof
Abstract superclass function filler. Returns self here but should
return something more useful if an array.
$r->empty
Empties all content from this object to free up memory or to be read to
pass the object into the free list. Simplistically undefs all instance
variables other than object number and generation.
$r->merge($objind)
This merges content information into an object reference place-holder.
This occurs when an object reference is read before the object
definition and the information in the read data needs to be merged into
the object place-holder
$r->is_obj($pdf)
Returns whether this object is a full object with its own object number
or whether it is purely a sub-object. $pdf indicates which output file
we are concerned that the object is an object in.
$r->copy($inpdf, $res, $unique, $outpdf, %opts)
Returns a new copy of this object.
$inpdf gives the source pdf object for the object to be copied. $outpdf
gives the target pdf for the object to be copied into. $outpdf may be
undefined. $res may be defined in which case the object is copied into
that object. $unique controls recursion. if $unique is non zero then
new objects are always created and recursion always occurs. But each
time recursion occurs, $unique is incremented. Thus is $unique starts
with a negative value it is possible to stop the recursion at a certain
depth. Of course for a positive value of $unique, recursion always
occurs.
If $unique is 0 then recursion only occurs if $outpdf is not the same
as $inpdf. In this case, a cache is held in $outpdf to see whether a
previous copy of the same object has been made. If so, then that
previous copy is returned otherwise a new object is made and added to
the cache and recursed into.
Objects that are full objects with their own id numbers are
correspondingly full objects in the output pdf.
perl v5.14.0 2011-06-17 Text::PDF::Objind(3)
