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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Reference.php 18993 2009-11-15 17:09:16Z alexander $
*/
/** Internally used classes */
require_once 'Zend/Pdf/Element/Null.php';
/** Zend_Pdf_Element */
require_once 'Zend/Pdf/Element.php';
/**
* PDF file 'reference' element implementation
*
* @category Zend
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Element_Reference extends Zend_Pdf_Element
{
/**
* Object value
* The reference to the object
*
* @var mixed
*/
private $_ref;
/**
* Object number within PDF file
*
* @var integer
*/
private $_objNum;
/**
* Generation number
*
* @var integer
*/
private $_genNum;
/**
* Reference context
*
* @var Zend_Pdf_Element_Reference_Context
*/
private $_context;
/**
* Reference to the factory.
*
* It's the same as referenced object factory, but we save it here to avoid
* unnecessary dereferencing, whech can produce cascade dereferencing and parsing.
* The same for duplication of getFactory() function. It can be processed by __call()
* method, but we catch it here.
*
* @var Zend_Pdf_ElementFactory
*/
private $_factory;
/**
* Object constructor:
*
* @param integer $objNum
* @param integer $genNum
* @param Zend_Pdf_Element_Reference_Context $context
* @param Zend_Pdf_ElementFactory $factory
* @throws Zend_Pdf_Exception
*/
public function __construct($objNum, $genNum = 0, Zend_Pdf_Element_Reference_Context $context, Zend_Pdf_ElementFactory $factory)
{
if ( !(is_integer($objNum) && $objNum > 0) ) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Object number must be positive integer');
}
if ( !(is_integer($genNum) && $genNum >= 0) ) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Generation number must be non-negative integer');
}
$this->_objNum = $objNum;
$this->_genNum = $genNum;
$this->_ref = null;
$this->_context = $context;
$this->_factory = $factory;
}
/**
* Check, that object is generated by specified factory
*
* @return Zend_Pdf_ElementFactory
*/
public function getFactory()
{
return $this->_factory;
}
/**
* Return type of the element.
*
* @return integer
*/
public function getType()
{
if ($this->_ref === null) {
$this->_dereference();
}
return $this->_ref->getType();
}
/**
* Return reference to the object
*
* @param Zend_Pdf_Factory $factory
* @return string
*/
public function toString($factory = null)
{
if ($factory === null) {
$shift = 0;
} else {
$shift = $factory->getEnumerationShift($this->_factory);
}
return $this->_objNum + $shift . ' ' . $this->_genNum . ' R';
}
/**
* Dereference.
* Take inderect object, take $value member of this object (must be Zend_Pdf_Element),
* take reference to the $value member of this object and assign it to
* $value member of current PDF Reference object
* $obj can be null
*
* @throws Zend_Pdf_Exception
*/
private function _dereference()
{
if (($obj = $this->_factory->fetchObject($this->_objNum . ' ' . $this->_genNum)) === null) {
$obj = $this->_context->getParser()->getObject(
$this->_context->getRefTable()->getOffset($this->_objNum . ' ' . $this->_genNum . ' R'),
$this->_context
);
}
if ($obj === null ) {
$this->_ref = new Zend_Pdf_Element_Null();
return;
}
if ($obj->toString() != $this->_objNum . ' ' . $this->_genNum . ' R') {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Incorrect reference to the object');
}
$this->_ref = $obj;
}
/**
* Mark object as modified, to include it into new PDF file segment.
*/
public function touch()
{
if ($this->_ref === null) {
$this->_dereference();
}
$this->_ref->touch();
}
/**
* Return object, which can be used to identify object and its references identity
*
* @return Zend_Pdf_Element_Object
*/
public function getObject()
{
if ($this->_ref === null) {
$this->_dereference();
}
return $this->_ref;
}
/**
* Get handler
*
* @param string $property
* @return mixed
*/
public function __get($property)
{
if ($this->_ref === null) {
$this->_dereference();
}
return $this->_ref->$property;
}
/**
* Set handler
*
* @param string $property
* @param mixed $value
*/
public function __set($property, $value)
{
if ($this->_ref === null) {
$this->_dereference();
}
$this->_ref->$property = $value;
}
/**
* Call handler
*
* @param string $method
* @param array $args
* @return mixed
*/
public function __call($method, $args)
{
if ($this->_ref === null) {
$this->_dereference();
}
return call_user_func_array(array($this->_ref, $method), $args);
}
/**
* Clean up resources
*/
public function cleanUp()
{
$this->_ref = null;
}
/**
* Convert PDF element to PHP type.
*
* @return mixed
*/
public function toPhp()
{
if ($this->_ref === null) {
$this->_dereference();
}
return $this->_ref->toPhp();
}
}
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