split xml to smaller one

XmlSpliter.php

<?php

class Lmnts_AdsImporter_Model_XmlSpliter
{
    const ITEM_NUMBER = 6;

    private $xmls = array();

    public function splitAllFiles()
    {
        $pathManager = Mage::getModel('adsimporter/pathManager');
        $paths = $pathManager->getXmlPaths();

        foreach($paths as $path){
            $this->splitIntoSmaller($path);
        }
    }


    private function splitIntoSmaller($xmlPath)
    {
        $baseXml = new DOMDocument();
        $baseXml->load($xmlPath);
        $countItem = $baseXml->getElementsByTagName("item")->length;

        $nodes = $this->getAMDNodes($baseXml); //get array witch add, modify , and delete node


        $this->split($nodes, $countItem);
        $this->createFiles();
        exit();
    }

    private function createFiles()
    {

    }

    private function split($nodes, $countItem)
    {
        $iteration = 0;
        $smallerXml = null;

        foreach ($nodes as $key =>$node){
            foreach ($node->getElementsByTagName("item") as $item){

                $smallerXml = $this->createOrGetXml( $iteration, $smallerXml);

                $node = $smallerXml->getElementsByTagName($key)->item(0); // node  = add || modify || delete
                $item = $smallerXml->importNode($item, true);
                $node->appendChild($item);

                if( $iteration == $countItem - 1){
                    $this->xmls[] = $smallerXml->saveXML();
                }

                $iteration++;
            }

        }
    }

    private function getAMDNodes($baseXml)
    {
        return  array(
            'add' => $baseXml->getElementsByTagName("add")->item(0),
            'modify' => $baseXml->getElementsByTagName("modify")->item(0),
            'delete' => $baseXml->getElementsByTagName("delete")->item(0),
        );
    }

    private function shouldBeNewDocument($iteration)
    {
        if($iteration % self::ITEM_NUMBER == 0){
            return true;
        }
    }

    private function createOrGetXml($iteration, $smallerXml)
    {
        if($this->shouldBeNewDocument($iteration)){
            if($iteration != 0){
                $this->xmls[] = $smallerXml->saveXML();
            }
            return $this->createXmlSkelet();

        }

        return $smallerXml;
    }

    private function createXmlSkelet()
    {
        $newdoc = new DOMDocument();
        $newdoc->formatOutput = true;

        $content = $newdoc->createElement('content');
        $add     = $newdoc->createElement('add');
        $modify =  $newdoc->createElement('modify');
        $delete =  $newdoc->createElement('delete');
        $content = $newdoc->appendChild($content);
        $content->appendChild($add);
        $content->appendChild($modify);
        $content->appendChild($delete);
        return $newdoc;
    }

    public function getXmlStructure(SimpleXMLElement $xml)
    {
        $xml = new SimpleXMLElement('<content></content>');
        $xml->addChild('add');
        $xml->addChild('modify');
        $xml->addChild('delete');
        return $xml;
    }


    private function createFile($fileName, $content)
    {
        $pathManager = Mage::getModel('adsimporter/pathManager');

        $io = new Varien_Io_File();
        $io->open(array('path'=>$pathManager->getDirectoryPath() ));
        $io->filePutContent($fileName, $content);
    }

}