<?php
namespace Utility\Import;

class Xml implements ImportInterface
{
	private $_file;
	private $_specialFields = array();
	private $_domdoc;
	private $_rowXPath;
	private $_elements;
	private $_currentItem;

	public function __construct($file)
	{
		$this->reset();
		$this->_file = $file;
		if(!file_exists($this->_file))
			throw new \Exception('File ' . $this->_file . ' not found');
		$this->_domdoc = new \DOMDocument();
		$this->_domdoc->load($this->_file);
	}

	/* (non-PHPdoc)
	 * @see Nirph_DataImport_Interface::getRecord()
	*/
	public function getRecord ()
	{
		$record = array();
		/* @var $this->_elements DOMNodeList */
		if($this->_currentItem >= $this->_elements->length)
			return false;
		/* @var $node DOMNodeList */
		$nodes = $this->_elements->item($this->_currentItem)->childNodes;
		for($i = 1;$i < $nodes->length; $i+=2) { // The first item is a #text
			if(is_string($nodes->item($i)->nodeValue)) // Only get nodes that has a text value
				$record[$nodes->item($i)->nodeName] = $nodes->item($i)->nodeValue;
		}
		$this->_currentItem++;
		return $record;
	}

	/* (non-PHPdoc)
	 * @see Nirph_DataImport_Interface::reset()
	*/
	public function reset ()
	{
		$this->_currentItem = 0;
	}

	/* (non-PHPdoc)
	 * @see Nirph_DataImport_Interface::setField()
	*/
	public function setField ($fieldNr, FieldInterface $class)
	{
		// TODO Auto-generated method stub
	}

	public function setRowElementXPath($xPath)
	{
		// TODO: Validation
		$this->_rowXPath = $xPath;
		$xpath = new \DOMXpath($this->_domdoc);
		/* @var $this->_elements DOMNodeList */
		$this->_elements = $xpath->query($this->_rowXPath);
		if($this->_elements === false)
			throw new \Exception("Invalid xpath");
	}

}