ElementFactory.php

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<?php
#require_once 'Zend/Pdf/ElementFactory/Interface.php';

class Zend_Pdf_ElementFactory implements Zend_Pdf_ElementFactory_Interface
{
    private $_modifiedObjects = array();

    private $_removedObjects;

    private $_registeredObjects = array();

    private $_objectCount;


    private $_attachedFactories = array();


    private $_factoryId;

    private static $_identity = 0;


    private $_shiftCalculationCache = array();


    public function __construct($objCount)
    {
        $this->_objectCount    = (int)$objCount;
        $this->_factoryId      = self::$_identity++;
        $this->_removedObjects = new SplObjectStorage();
    }


    public function getFactory()
    {
        return $this;
    }

    static public function createFactory($objCount)
    {
        #require_once 'Zend/Pdf/ElementFactory/Proxy.php';
        return new Zend_Pdf_ElementFactory_Proxy(new Zend_Pdf_ElementFactory($objCount));
    }

    public function close()
    {
        $this->_modifiedObjects   = null;
        $this->_removedObjects    = null;
        $this->_attachedFactories = null;

        foreach ($this->_registeredObjects as $obj) {
            $obj->cleanUp();
        }
        $this->_registeredObjects = null;
    }

    public function resolve()
    {
        return $this;
    }

    public function getId()
    {
        return $this->_factoryId;
    }

    public function setObjectCount($objCount)
    {
        $this->_objectCount = (int)$objCount;
    }

    public function getObjectCount()
    {
        $count = $this->_objectCount;

        foreach ($this->_attachedFactories as $attached) {
            $count += $attached->getObjectCount() - 1; // -1 as "0" object is a special case and shared between factories
        }

        return $count;
    }


    public function attach(Zend_Pdf_ElementFactory_Interface $factory)
    {
        if ( $factory === $this || isset($this->_attachedFactories[$factory->getId()])) {
            return;
        }

        $this->_attachedFactories[$factory->getId()] = $factory;
    }


    public function calculateShift(Zend_Pdf_ElementFactory_Interface $factory)
    {
        if ($factory === $this) {
            return 0;
        }

        if (isset($this->_shiftCalculationCache[$factory->_factoryId])) {
            return $this->_shiftCalculationCache[$factory->_factoryId];
        }

        $shift = $this->_objectCount - 1;

        foreach ($this->_attachedFactories as $subFactory) {
            $subFactoryShift = $subFactory->calculateShift($factory);

            if ($subFactoryShift != -1) {
                // context found
                $this->_shiftCalculationCache[$factory->_factoryId] = $shift + $subFactoryShift;
                return $shift + $subFactoryShift;
            } else {
                $shift += $subFactory->getObjectCount()-1;
            }
        }

        $this->_shiftCalculationCache[$factory->_factoryId] = -1;
        return -1;
    }

    public function cleanEnumerationShiftCache()
    {
        $this->_shiftCalculationCache = array();

        foreach ($this->_attachedFactories as $attached) {
            $attached->cleanEnumerationShiftCache();
        }
    }

    public function getEnumerationShift(Zend_Pdf_ElementFactory_Interface $factory)
    {
        if (($shift = $this->calculateShift($factory)) == -1) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Wrong object context');
        }

        return $shift;
    }

    public function markAsModified(Zend_Pdf_Element_Object $obj)
    {
        if ($obj->getFactory() !== $this) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Object is not generated by this factory');
        }

        $this->_modifiedObjects[$obj->getObjNum()] = $obj;
    }


    public function remove(Zend_Pdf_Element_Object $obj)
    {
        if (!$obj->compareFactory($this)) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Object is not generated by this factory');
        }

        $this->_modifiedObjects[$obj->getObjNum()] = $obj;
        $this->_removedObjects->attach($obj);
    }


    public function newObject(Zend_Pdf_Element $objectValue)
    {
        #require_once 'Zend/Pdf/Element/Object.php';
        $obj = new Zend_Pdf_Element_Object($objectValue, $this->_objectCount++, 0, $this);
        $this->_modifiedObjects[$obj->getObjNum()] = $obj;
        return $obj;
    }

    public function newStreamObject($streamValue)
    {
        #require_once 'Zend/Pdf/Element/Object/Stream.php';
        $obj = new Zend_Pdf_Element_Object_Stream($streamValue, $this->_objectCount++, 0, $this);
        $this->_modifiedObjects[$obj->getObjNum()] = $obj;
        return $obj;
    }


    public function listModifiedObjects($rootFactory = null)
    {
        if ($rootFactory == null) {
            $rootFactory = $this;
            $shift = 0;
        } else {
            $shift = $rootFactory->getEnumerationShift($this);
        }

        ksort($this->_modifiedObjects);

        $result = array();
        #require_once 'Zend/Pdf/UpdateInfoContainer.php';
        foreach ($this->_modifiedObjects as $objNum => $obj) {
            if ($this->_removedObjects->contains($obj)) {
                            $result[$objNum+$shift] = new Zend_Pdf_UpdateInfoContainer($objNum + $shift,
                                                                           $obj->getGenNum()+1,
                                                                           true);
            } else {
                $result[$objNum+$shift] = new Zend_Pdf_UpdateInfoContainer($objNum + $shift,
                                                                           $obj->getGenNum(),
                                                                           false,
                                                                           $obj->dump($rootFactory));
            }
        }

        foreach ($this->_attachedFactories as $factory) {
            $result += $factory->listModifiedObjects($rootFactory);
        }

        return $result;
    }

    public function registerObject(Zend_Pdf_Element_Object $obj, $refString)
    {
        $this->_registeredObjects[$refString] = $obj;
    }

    public function fetchObject($refString)
    {
        if (!isset($this->_registeredObjects[$refString])) {
            return null;
        }
        return $this->_registeredObjects[$refString];
    }


    public function isModified()
    {
        if (count($this->_modifiedObjects) != 0) {
            return true;
        }

        foreach ($this->_attachedFactories as $subFactory) {
            if ($subFactory->isModified()) {
                return true;
            }
        }

        return false;
    }
}