<?php

/**

 * Defines the ServiceConfig class

 * 

 * PHP version 5.3

 * 

 * @category  ODataConnectorForMySQLException

 * @package   ODataConnectorForMySQLException_Common

 * @author    Yash K. Kothari <odataphpproducer_alias@microsoft.com> 

 * @copyright 2011 Microsoft Corp. (http://www.microsoft.com)

 * @license   New BSD license, (http://www.opensource.org/licenses/bsd-license.php)

 * @version   SVN: 1.0

 * @link      

 * 

 */

namespace ODataConnectorForMySQL\Common;

use ODataConnectorForMySQL\Common\ODataConnectorForMySQLException;

/**

 * Helper class to read and velidate the service config file

 * 

 * @category  ODataConnectorForMySQL

 * @package   ODataConnectorForMySQL_Common

 * @author    Yash K. Kothari <odataphpproducer_alias@microsoft.com> 

 * @copyright 2011 Microsoft Corp. (http://www.microsoft.com)

 * @license   New BSD license, (http://www.opensource.org/licenses/bsd-license.php)

 * @version   Release: 1.0

 * @link      

 */

class ServiceConfig

{

    /**

     * Read and validates the configuration for the given service.

     * 

     * @param string $configFile config filename for all the services

     * 

     * @return void

     * 

     * @throws MySQLProducerException If configuration file 

     * does not exists or malformed.

     */

    public static function validateAndGetsServiceInfo(

        $configFile = '../service.config.xml'

    ) {

        $xml = simplexml_load_file(

            dirname(__FILE__)."/".$configFile, 

            null, 

            LIBXML_NOCDATA

        );

        if (!$xml) {

            die('service.config file is not in proper XML format');

        }



        if (count($xml->children()) != 1) {

            die("Config file has more than one root entries");

        }



        $pathResult = $xml->xpath("/configuration/rules");

        if (empty($pathResult)) {

             die("No rules info found in service config");

        }

                

        $pathResult = $xml->xpath("/configuration/rules/viewManyToManyRelationship");

        if (empty($pathResult)) {

            die("The mendatory configuration info 'viewManyToManyRelationship' is"

                ." missing in the config file");

        } else if ((strtolower(strval($pathResult[0]))) != "true" 

            and (strtolower(strval($pathResult[0]))) != "false"

        ) {

            die("Value: ".strval($pathResult[0])." is not valid for "

                ."'viewManyToManyRelationship' option");

        } else {

            $serviceInfo['viewManyToManyRelationship'] = strval($pathResult[0]);

        }

        unset($pathResult);

        $serviceInfo['followPularizeSingularizeRule'] = "true";

        $pathResult = $xml->xpath(

            "/configuration/rules/queryProviderVersion"

        );

        if (empty($pathResult)) {

            die("The mendatory configuration info 'queryProviderVersion' is missing"

                ." in the config file");

        } else if (strval($pathResult[0]) != "1" and strval($pathResult[0]) != "2") {

            die("Value: ".strval($pathResult[0])." is not valid for "

                ."'queryProviderVersion' option");

        } else {

            $serviceInfo['queryProviderVersion'] = strval($pathResult[0]);

        }

        unset($pathResult);

        $pathResult = $xml->xpath(

            "/configuration/rules/acceptCountRequest"

        );

        if (!empty($pathResult) and strtolower(strval($pathResult[0])) != "true" 

            and strtolower(strval($pathResult[0])) != "false" 

            and strtolower(strval($pathResult[0])) != "null"

        ) {

            die("Value: ".strval($pathResult[0])." is not valid for "

                ."'acceptCountRequest' option");

        }

        unset($pathResult);

        $pathResult = $xml->xpath(

            "/configuration/rules/acceptProjectionRequest"

        );

        if (!empty($pathResult) and  strtolower(strval($pathResult[0])) != "true" 

            and strtolower(strval($pathResult[0])) != "false" 

            and strtolower(strval($pathResult[0])) != "null"

        ) {

            die("Value: ".strval($pathResult[0])." is not valid for" 

                ."'acceptProjectionRequest' option");

        }

        unset($pathResult);

        $pathResult = $xml->xpath(

            "/configuration/rules/maxDataServiceVersion"

        );

        if ( !empty($pathResult) and strval($pathResult[0]) != "V1" 

            and strval($pathResult[0]) != "V2" and strval($pathResult[0]) != "V3"

        ) {

            die("Value: ".strval($pathResult[0])." is not valid for" 

                ."'maxDataServiceVersion' option");

        }

        unset($pathResult);

        return $serviceInfo;

    }

}