Object.php

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


class Zend_Pdf_Element_Object extends Zend_Pdf_Element
{
    protected $_value;

    protected $_objNum;

    protected $_genNum;

    protected $_factory;

    public function __construct(Zend_Pdf_Element $val, $objNum, $genNum, Zend_Pdf_ElementFactory $factory)
    {
        if ($val instanceof self) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Object number must not be an instance of Zend_Pdf_Element_Object.');
        }

        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->_value   = $val;
        $this->_objNum  = $objNum;
        $this->_genNum  = $genNum;
        $this->_factory = $factory;

        $this->setParentObject($this);

        $factory->registerObject($this, $objNum . ' ' . $genNum);
    }


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

    public function getType()
    {
        return $this->_value->getType();
    }


    public function getObjNum()
    {
        return $this->_objNum;
    }


    public function getGenNum()
    {
        return $this->_genNum;
    }


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

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


    public function dump(Zend_Pdf_ElementFactory $factory)
    {
        $shift = $factory->getEnumerationShift($this->_factory);

        return  $this->_objNum + $shift . " " . $this->_genNum . " obj \n"
             .  $this->_value->toString($factory) . "\n"
             . "endobj\n";
    }

    public function __get($property)
    {
        return $this->_value->$property;
    }

    public function __set($property, $value)
    {
        $this->_value->$property = $value;
    }

    public function __call($method, $args)
    {
        return call_user_func_array(array($this->_value, $method), $args);
    }

    public function makeClone(Zend_Pdf_ElementFactory $factory, array &$processed, $mode)
    {
        $id = spl_object_hash($this);
        if (isset($processed[$id])) {
            // Do nothing if object is already processed
            // return it
            return $processed[$id];
        }

        // Create obect with null value and register it in $processed container
        $processed[$id] = $clonedObject = $factory->newObject(new Zend_Pdf_Element_Null());

        // Pecursively process actual data
        $clonedObject->_value = $this->_value->makeClone($factory, $processed, $mode);

        if ($clonedObject->_value instanceof Zend_Pdf_Element_Null) {
            // Do not store null objects within $processed container since it may be filtered
            // by $mode parameter but used in some future pass
            unset($processed[$id]);

            // Return direct null object
            return $clonedObject->_value;
        }

        return $clonedObject;
    }

    public function touch()
    {
        $this->_factory->markAsModified($this);
    }

    public function getObject()
    {
        return $this;
    }

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

    public function toPhp()
    {
        return $this->_value->toPhp();
    }
}