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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**

 * Contains the DB_QueryTool_EasyJoin class

 *

 * PHP versions 4 and 5

 *

 * LICENSE: This source file is subject to version 3.0 of the PHP license

 * that is available through the world-wide-web at the following URI:

 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of

 * the PHP License and are unable to obtain it through the web, please

 * send a note to license@php.net so we can mail you a copy immediately.

 *

 * @category   Database

 * @package    DB_QueryTool

 * @author     Wolfram Kriesing <wk@visionp.de>

 * @author     Paolo Panto <wk@visionp.de>

 * @copyright  2003-2005 Wolfram Kriesing, Paolo Panto

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @version    CVS: $Id: EasyJoin.php,v 1.9 2005/02/27 17:15:05 quipo Exp $

 * @link       http://pear.php.net/package/DB_QueryTool

 */

/**

 * require the DB_QueryTool_Query class

 */

require_once 'DB/QueryTool/Query.php';

/**

 * DB_QueryTool_EasyJoin class

 *

 * @category   Database

 * @package    DB_QueryTool

 * @author     Wolfram Kriesing <wk@visionp.de>

 * @copyright  2003-2005 Wolfram Kriesing

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @link       http://pear.php.net/package/DB_QueryTool

 */

class DB_QueryTool_EasyJoin extends DB_QueryTool_Query

{

    // {{{ class vars

    /**

     * This is the regular expression that shall be used to find a table's shortName

     * in a column name, the string found by using this regular expression will be removed

     * from the column name and it will be checked if it is a table name

     * i.e. the default '/_id$/' would find the table name 'user' from the column name 'user_id'

     *

     * @var string regexp

     */

    var $_tableNamePreg = '/_id$/';

    /**

     * This is to find the column name that is referred by it, so the default find

     * from 'user_id' the column 'id' which will be used to refer to the 'user' table

     *

     * @var string regexp

     */

    var $_columnNamePreg = '/^.*_/';

    // }}}

    // {{{ __construct()

    /**

     * call parent constructor

     * @param mixed $dsn DSN string, DSN array or DB object

     * @param array $options

     */

    function __construct($dsn=false, $options=array())

    {

        parent::DB_QueryTool_Query($dsn, $options);

    }

    // }}}

    // {{{ autoJoin()

    /**

     * Join the given tables, using the column names, to find out how to join the tables;

     * i.e., if table1 has a column named "table2_id", this method will join

     * "WHERE table1.table2_id=table2.id".

     * All joins made here are only concatenated via AND.

     * @param array $tables

     */

    function autoJoin($tables)

    {

// FIXXME if $tables is empty autoJoin all available tables that have a relation

// to $this->table, starting to search in $this->table

        settype($tables, 'array');

        // add this->table to the tables array, so we go thru the current table first

        $tables = array_merge(array($this->table), $tables);

        $shortNameIndexed = $this->getTableSpec(true, $tables);

        $nameIndexed = $this->getTableSpec(false, $tables);

//print_r($shortNameIndexed);

//print_r($tables);        print '<br><br>';

        if (sizeof($shortNameIndexed) != sizeof($tables)) {

            $this->_errorLog("autoJoin-ERROR: not all the tables are in the tableSpec!<br />");

        }

        $joinTables = array();

        $joinConditions = array();

        foreach ($tables as $aTable) {   // go through $this->table and all the given tables

            if ($metadata = $this->metadata($aTable))

            foreach ($metadata as $aCol => $x) {   // go through each row to check which might be related to $aTable

                $possibleTableShortName = preg_replace($this->_tableNamePreg,  '' , $aCol);

                $possibleColumnName     = preg_replace($this->_columnNamePreg, '' , $aCol);

//print "$aTable.$aCol .... possibleTableShortName=$possibleTableShortName .... possibleColumnName=$possibleColumnName<br />";

                if (isset($shortNameIndexed[$possibleTableShortName])) {

                    // are the tables given in the tableSpec?

                    if (!$shortNameIndexed[$possibleTableShortName]['name'] ||

                        !$nameIndexed[$aTable]['name']) {

                        // its an error of the developer, so log the error, dont show it to the end user

                        $this->_errorLog("autoJoin-ERROR: '$aTable' is not given in the tableSpec!<br />");

                    } else {

                        // do only join different table.col combination,

                        // we should not join stuff like 'question.question=question.question'

                        // this would be quite stupid, but it used to be :-(

                        if ($shortNameIndexed[$possibleTableShortName]['name'] != $aTable ||

                            $possibleColumnName != $aCol

                        ) {

                            $where = $shortNameIndexed[$possibleTableShortName]['name'].".$possibleColumnName=$aTable.$aCol";

                            $this->addJoin($nameIndexed[$aTable]['name'],                      $where);

                            $this->addJoin($shortNameIndexed[$possibleTableShortName]['name'], $where);

                        }

                    }

                }

            }

        }

    }

    // }}}

}

?>