<?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

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

/** Zend_Pdf_Element */

require_once 'Zend/Pdf/Element.php';

/**

 * PDF file 'indirect object' element implementation

 *

 * @category   Zend

 * @package    Zend_Pdf

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Pdf_Element_Object extends Zend_Pdf_Element

{

    /**

     * Object value

     *

     * @var Zend_Pdf_Element

     */

    protected $_value;

    /**

     * Object number within PDF file

     *

     * @var integer

     */

    protected $_objNum;

    /**

     * Generation number

     *

     * @var integer

     */

    protected $_genNum;

    /**

     * Reference to the factory.

     *

     * @var Zend_Pdf_ElementFactory

     */

    protected $_factory;

    /**

     * Object constructor

     *

     * @param Zend_Pdf_Element $val

     * @param integer $objNum

     * @param integer $genNum

     * @param Zend_Pdf_ElementFactory $factory

     * @throws Zend_Pdf_Exception

     */

    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);

    }

    /**

     * 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()

    {

        return $this->_value->getType();

    }

    /**

     * Get object number

     *

     * @return integer

     */

    public function getObjNum()

    {

        return $this->_objNum;

    }

    /**

     * Get generation number

     *

     * @return integer

     */

    public function getGenNum()

    {

        return $this->_genNum;

    }

    /**

     * 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';

    }

    /**

     * Dump object to a string to save within PDF file.

     *

     * $factory parameter defines operation context.

     *

     * @param Zend_Pdf_ElementFactory $factory

     * @return string

     */

    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";

    }

    /**

     * Get handler

     *

     * @param string $property

     * @return mixed

     */

    public function __get($property)

    {

        return $this->_value->$property;

    }

    /**

     * Set handler

     *

     * @param string $property

     * @param  mixed $value

     */

    public function __set($property, $value)

    {

        $this->_value->$property = $value;

    }

    /**

     * Call handler

     *

     * @param string $method

     * @param array  $args

     * @return mixed

     */

    public function __call($method, $args)

    {

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

    }

    /**

     * Detach PDF object from the factory (if applicable), clone it and attach to new factory.

     *

     * @param Zend_Pdf_ElementFactory $factory  The factory to attach

     * @param array &$processed  List of already processed indirect objects, used to avoid objects duplication

     * @param integer $mode  Cloning mode (defines filter for objects cloning)

     * @returns Zend_Pdf_Element

     */

    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;

    }

    /**

     * Mark object as modified, to include it into new PDF file segment

     */

    public function touch()

    {

        $this->_factory->markAsModified($this);

    }

    /**

     * Return object, which can be used to identify object and its references identity

     *

     * @return Zend_Pdf_Element_Object

     */

    public function getObject()

    {

        return $this;

    }

    /**

     * Clean up resources, used by object

     */

    public function cleanUp()

    {

        $this->_value = null;

    }

    /**

     * Convert PDF element to PHP type.

     *

     * @return mixed

     */

    public function toPhp()

    {

        return $this->_value->toPhp();

    }

}