DependencyEntityFactory.php

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<?php
namespace TYPO3\CMS\Version\Dependency;

class DependencyEntityFactory {

    protected $elements = array();

    protected $references = array();

    public function getElement($table, $id, array $data = array(), \TYPO3\CMS\Version\Dependency\DependencyResolver $dependency) {
        $element = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Version\\Dependency\\ElementEntity', $table, $id, $data, $dependency);
        $elementName = $element->__toString();
        if (!isset($this->elements[$elementName])) {
            $this->elements[$elementName] = $element;
        }
        return $this->elements[$elementName];
    }

    public function getReference(\TYPO3\CMS\Version\Dependency\ElementEntity $element, $field) {
        $referenceName = $element->__toString() . '.' . $field;
        if (!isset($this->references[$referenceName][$field])) {
            $this->references[$referenceName][$field] = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Version\\Dependency\\ReferenceEntity', $element, $field);
        }
        return $this->references[$referenceName][$field];
    }

    public function getReferencedElement($table, $id, $field, array $data = array(), \TYPO3\CMS\Version\Dependency\DependencyResolver $dependency) {
        return $this->getReference($this->getElement($table, $id, $data, $dependency), $field);
    }

}