LazyLoadingProxy.php

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<?php
namespace TYPO3\CMS\Extbase\Persistence\Generic;

class LazyLoadingProxy implements \Iterator, \TYPO3\CMS\Extbase\Persistence\Generic\LoadingStrategyInterface {

    protected $dataMapper;

    private $parentObject;

    private $propertyName;

    private $fieldValue;

    public function __construct($parentObject, $propertyName, $fieldValue) {
        $this->parentObject = $parentObject;
        $this->propertyName = $propertyName;
        $this->fieldValue = $fieldValue;
    }

    public function _loadRealInstance() {
        // this check safeguards against a proxy being activated multiple times
        // usually that does not happen, but if the proxy is held from outside
        // it's parent... the result would be weird.
        if ($this->parentObject->_getProperty($this->propertyName) instanceof \TYPO3\CMS\Extbase\Persistence\Generic\LazyLoadingProxy) {
            $objects = $this->dataMapper->fetchRelated($this->parentObject, $this->propertyName, $this->fieldValue, FALSE, FALSE);
            $propertyValue = $this->dataMapper->mapResultToPropertyValue($this->parentObject, $this->propertyName, $objects);
            $this->parentObject->_setProperty($this->propertyName, $propertyValue);
            $this->parentObject->_memorizeCleanState($this->propertyName);
            return $propertyValue;
        } else {
            return $this->parentObject->_getProperty($this->propertyName);
        }
    }

    public function __call($methodName, $arguments) {
        $realInstance = $this->_loadRealInstance();
        if (!is_object($realInstance)) {
            return NULL;
        }
        return call_user_func_array(array($realInstance, $methodName), $arguments);
    }

    public function __get($propertyName) {
        $realInstance = $this->_loadRealInstance();
        return $realInstance->{$propertyName};
    }

    public function __set($propertyName, $value) {
        $realInstance = $this->_loadRealInstance();
        $realInstance->{$propertyName} = $value;
    }

    public function __isset($propertyName) {
        $realInstance = $this->_loadRealInstance();
        return isset($realInstance->{$propertyName});
    }

    public function __unset($propertyName) {
        $realInstance = $this->_loadRealInstance();
        unset($realInstance->{$propertyName});
    }

    public function __toString() {
        $realInstance = $this->_loadRealInstance();
        return $realInstance->__toString();
    }

    public function current() {
        $realInstance = $this->_loadRealInstance();
        return current($realInstance);
    }

    public function key() {
        $realInstance = $this->_loadRealInstance();
        return key($realInstance);
    }

    public function next() {
        $realInstance = $this->_loadRealInstance();
        next($realInstance);
    }

    public function rewind() {
        $realInstance = $this->_loadRealInstance();
        reset($realInstance);
    }

    public function valid() {
        return $this->current() !== FALSE;
    }
}