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<?php
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require_once 'lib/Db/Table.php';
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/**
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 * Generic abstract database mapper class
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 *
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 * @author Thomas Lahn
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 */
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abstract class Mapper
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{
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  /**
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   * Class name of the associated table model
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   *
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   * @var string
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   */
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  protected $_table = 'Table';
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  protected $_dbTable;
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  /**
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   * Sets the {@link Table} for this mapper
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   * @param string|Table $dbTable
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   *   Class name of the new instance, or an existing instance
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   * @throws Exception if <var>$dbTable</var> is not a <code>Table</code>
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   */
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  public function setDbTable($table)
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  {
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    if (is_string($table))
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    {
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      $table = new $table();
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    }
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    if (!($table instanceof Table)) {
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      throw new Exception('Invalid table data gateway provided');
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    }
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    $this->_dbTable = $table;
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  }
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  /**
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   * Gets the {@link Table} for this mapper
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   *
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   * @param string|Table $table
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   *   Class name of the new instance or an existing instance.
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   *   The default is the value of the <code>$_table</code> property.
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   * @return Table
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   * @throws Exception if <var>$dbTable</var> is not a <code>Table</code>
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   * @see Mapper::setDbTable()
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   */
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  public function getDbTable($table = null)
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  {
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    if (is_null($this->_dbTable))
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    {
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      if (is_null($table))
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      {
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        $table = $this->_table;
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      }
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      $this->setDbTable($table);
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    }
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    return $this->_dbTable;
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  }
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  /**
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   * Sorts an array of objects by the property of the nested object.
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   * To be used with the u*sort() functions.
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   *
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   * @param object $a First operand of the comparison
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   * @param object $b Second operand of the comparison
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   * @param string $property
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   *   Name of the property of the nested object by which to sort the outer array
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   * @return int
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   *   0 if <var>$a</var> and <var>$b</var> are "equal",
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   *   <code>-1</code> if <var>$a</var> is "less" than <var>$b</var>,
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   *   <code>1</code> otherwise.
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   */
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  protected static function sortByProperty($a, $b, $property)
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  {
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    if ($a->$property === $b->$property)
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    {
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      return 0;
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    }
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    return ($a->$property < $b->$property) ? -1 : 1;
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  }
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}