<?php
// ----------------------------------------------------------------------------------
// Class: Dataset
// ----------------------------------------------------------------------------------

/**
* Dataset implementation.
* Superclass of datasetMem and datasetDb which contains shared functionality.
*
* @version  $Id$
* @author Daniel Westphal (http://www.d-westphal.de)
* @author Chris Bizer <chris@bizer.de>
*
* @package 	dataset
* @access	public
**/

class Dataset
{
	/**
    * Load a Dataset from a File
    *
    * @param string
	* @access	public
    */
	function loadFromFile($file)
	{
		$parser= new TriXParser($this);
		$parser->parseFile($file);
	}

	/**
    * Load a Datset from a string
    *
    * @param string
	* @access	public
    */
	function loadFromString($string)
	{
		$parser= new TriXParser($this);
		$parser->parseString($string);
	}

	/**
    * Serialize the Dataset to File
    *
    * @param  string
	* @access	public
    */
	function serializeToFile($fileName)
	{
		$serializer= new TriXSerializer($this);
		$serializer->serializeToFile($fileName);
	}

    /**
    * Serialize the Dataset to string
    *
    * @return string
    * @access	public
    */
	function serializeToString()
	{
		$serializer= new TriXSerializer($this);
		return $serializer->serializeToString();
	}

    /**
    * Performs a SPARQL query against an RDF Dataset.
    * The result can be retrived in SPARQL Query Results XML Format or
    * as an array containing the variables an their bindings.
    *
    * @param  String $query      the sparql query string
    * @param  String $resultform the result form ('xml' for SPARQL Query Results XML Format)
    * @return String/array
    */
    function sparqlQuery($query,$resultform = false){
        include_once(RDFAPI_INCLUDE_DIR.PACKAGE_SPARQL);
        $parser = new SparqlParser();
        $q = $parser->parse($query);

		$sparqlEngine = SparqlEngine::getInstance();
        $eng = $sparqlEngine->factory();
        return $eng->queryModel($this,$q,$resultform);
    }



}
?>