Target.php

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<?php
abstract class Zend_Pdf_Target
{
    public static function load(Zend_Pdf_Element $resource) {
        #require_once 'Zend/Pdf/Element.php';
        if ($resource->getType() == Zend_Pdf_Element::TYPE_DICTIONARY) {
            if (($resource->Type === null  ||  $resource->Type->value =='Action')  &&  $resource->S !== null) {
                // It's a well-formed action, load it
                #require_once 'Zend/Pdf/Action.php';
                return Zend_Pdf_Action::load($resource);
            } else if ($resource->D !== null) {
                // It's a destination
                $resource = $resource->D;
            } else {
                #require_once 'Zend/Pdf/Exception.php';
                throw new Zend_Pdf_Exception('Wrong resource type.');
            }
        }

        if ($resource->getType() == Zend_Pdf_Element::TYPE_ARRAY  ||
            $resource->getType() == Zend_Pdf_Element::TYPE_NAME   ||
            $resource->getType() == Zend_Pdf_Element::TYPE_STRING) {
            // Resource is an array, just treat it as an explicit destination array
            #require_once 'Zend/Pdf/Destination.php';
            return Zend_Pdf_Destination::load($resource);
        } else {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception( 'Wrong resource type.' );
        }
    }

    abstract public function getResource();
}