Reference.php

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<?php
#require_once 'Zend/Pdf/Element/Null.php';


#require_once 'Zend/Pdf/Element.php';

class Zend_Pdf_Element_Reference extends Zend_Pdf_Element
{
    private $_ref;

    private $_objNum;

    private $_genNum;

    private $_context;


    private $_factory;

    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;
    }

    public function getFactory()
    {
        return $this->_factory;
    }


    public function getType()
    {
        if ($this->_ref === null) {
            $this->_dereference();
        }

        return $this->_ref->getType();
    }


    public function toString($factory = null)
    {
        if ($factory === null) {
            $shift = 0;
        } else {
            $shift = $factory->getEnumerationShift($this->_factory);
        }

        return $this->_objNum + $shift . ' ' . $this->_genNum . ' R';
    }


    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;
    }

    public function makeClone(Zend_Pdf_ElementFactory $factory, array &$processed, $mode)
    {
        if ($this->_ref === null) {
            $this->_dereference();
        }

        // This code duplicates code in Zend_Pdf_Element_Object class,
        // but allows to avoid unnecessary method call in most cases
        $id = spl_object_hash($this->_ref);
        if (isset($processed[$id])) {
            // Do nothing if object is already processed
            // return it
            return $processed[$id];
        }

        return $this->_ref->makeClone($factory, $processed, $mode);
    }

    public function touch()
    {
        if ($this->_ref === null) {
            $this->_dereference();
        }

        $this->_ref->touch();
    }

    public function getObject()
    {
        if ($this->_ref === null) {
            $this->_dereference();
        }

        return $this->_ref;
    }

    public function __get($property)
    {
        if ($this->_ref === null) {
            $this->_dereference();
        }

        return $this->_ref->$property;
    }

    public function __set($property, $value)
    {
        if ($this->_ref === null) {
            $this->_dereference();
        }

        $this->_ref->$property = $value;
    }

    public function __call($method, $args)
    {
        if ($this->_ref === null) {
            $this->_dereference();
        }

        return call_user_func_array(array($this->_ref, $method), $args);
    }

    public function cleanUp()
    {
        $this->_ref = null;
    }

    public function toPhp()
    {
        if ($this->_ref === null) {
            $this->_dereference();
        }

        return $this->_ref->toPhp();
    }
}