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nooku-framework

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<?php
/**
 * @version        $Id$
 * @category    Koowa
 * @package     Koowa_Database
 * @subpackage  Row
 * @copyright    Copyright (C) 2007 - 2010 Johan Janssens and Mathias Verraes. All rights reserved.
 * @license        GNU GPLv2 <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
 * @link         http://www.koowa.org
 */

/**
 * Database Row Class
 *
 * @author        Johan Janssens <johan@koowa.org>
 * @category    Koowa
 * @package     Koowa_Database
 * @subpackage  Row
 */
abstract class KDatabaseRowAbstract extends KObject implements KObjectIdentifiable
{
    /**
     * Row states
     */
    const STATUS_DELETED    = 'deleted';
    const STATUS_INSERTED   = 'inserted';
    const STATUS_UPDATED    = 'updated';

    /**
     * The data for each column in the row (column_name => value).
     *
     * @var array
     */
    protected $_data = array();

    /**
     * Tracks columns where data has been updated. Allows more specific
     * save operations.
     *
     * @var array
     */
    protected $_modified = array();

    /**
     * Tracks the the status the row
     *
     * Status values are:
     *
     * `deleted`
     * : This row has been deleted successfully
     *
     * `inserted`
     * : The row was inserted successfully.
     *
     * `updated`
     * : The row was updated successfully.
     *
     * @var string
     *
     */
    protected $_status = null;

    /**
     * Tracks if row data is new (i.e., not in the database yet).
     *
     * @var bool
     */
    protected $_new = true;

    /**
     * KDatabaseTableAbstract parent class or instance.
     *
     * @var object
     */
    protected $_table;

    /**
     * Constructor
     *
     * @param     object     An optional KConfig object with configuration options.
     */
    public function __construct(KConfig $config = null)
    {
        //If no config is passed create it
        if(!isset($config)) $config = new KConfig();

        parent::__construct($config);

          // Set the table indentifier
        if(isset($config->table)) {
            $this->setTable($config->table);
        }

        // Reset the row
        $this->reset();

        // Set the new state of the row
        $this->_new = $config->new;

        // Set the row data
        if(isset($config->data))  {
            $this->setData($config->data->toArray(), $this->_new);
        }
    }

    /**
     * Initializes the options for the object
     *
     * Called from {@link __construct()} as a first step of object instantiation.
     *
     * @param     object     An optional KConfig object with configuration options.
     * @return void
     */
    protected function _initialize(KConfig $config)
    {
        $config->append(array(
            'table' => null,
             'data'    => null,
                'new'    => true
        ));

        parent::_initialize($config);
    }

    /**
     * Get the object identifier
     *
     * @return    KIdentifier
     * @see     KObjectIdentifiable
     */
    public function getIdentifier()
    {
        return $this->_identifier;
    }

    /**
     * Returns the status of this row.
     *
     * @return string The status value.
     */
    public function getStatus()
    {
        return $this->_status;
    }

    /**
     * Get the identifier for the table with the same name
     *
     * @return    KIdentifierInterface
     */
    final public function getTable()
    {
        if(!$this->_table)
        {
            $identifier         = clone $this->_identifier;
            $identifier->name    = KInflector::tableize($identifier->name);
            $identifier->path    = array('table');

            $this->_table = $identifier;
        }

        return $this->_table;
    }

    /**
     * Method to set a table object attached to the rowset
     *
     * @param    mixed    An object that implements KObjectIdentifiable, an object that
     *                  implements KIndentifierInterface or valid identifier string
     * @throws    KDatabaseRowException    If the identifier is not a table identifier
     * @return    KDatabaseRowsetAbstract
     */
    public function setTable($table)
    {
        $identifier = KFactory::identify($table);

        if($identifier->path[0] != 'table') {
            throw new KDatabaseRowException('Identifier: '.$identifier.' is not a table identifier');
        }

        $this->_table = $identifier;
        return $this;
    }

    /**
     * Saves the row to the database.
     *
     * This performs an intelligent insert/update and reloads the properties
     * with fresh data from the table on success.
     *
     * @return KDatabaseRowAbstract
     */
    public function save()
    {
        if($this->_new)
        {
            if(KFactory::get($this->getTable())->insert($this))
            {
                $this->_status   = self::STATUS_INSERTED;
                $this->_modified = array();
            }
           }
           else
           {
            if(KFactory::get($this->getTable())->update($this))
            {
                $this->_status   = self::STATUS_UPDATED;
                   $this->_modified = array();
            }
        }

        return $this;
    }

    /**
     * Deletes the row form the database.
     *
     * @return KDatabaseRowAbstract
     */
    public function delete()
    {
        if(!$this->_new)
        {
            if(KFactory::get($this->getTable())->delete($this))
            {
                $this->_status   = self::STATUS_DELETED;
                $this->_modified = array();
                $this->_new      = false;
            }
        }

        return $this;
    }

    /**
     * Resets to the default properties
     *
     * @return KDatabaseRowAbstract
     */
    public function reset()
    {
        $this->_data     = KFactory::get($this->getTable())->getDefaults();
        $this->_modified = array();
        $this->_status   = null;
        $this->_new      = true;

        return $this;
    }

    /**
     * Retrieve row field value
     *
     * @param      string     The column name.
     * @return     string     The corresponding column value.
     */
    public function __get($column)
    {
        $result = null;
        if(isset($this->_data[$column])) {
            $result = $this->_data[$column];
        }

        return $result;
    }

    /**
     * Set row field value
     *
     * If the value is the same as the current value it will not be set
     *
     * @param      string     The column name.
     * @param      mixed      The value for the property.
     * @return     void
     */
    public function __set($column, $value)
    {
        //If data is unchanged return
        if(isset($this->_data[$column]) && $this->_data[$column] == $value) {
            return;
        }

        $this->_data[$column]     = $value;
           $this->_modified[$column] = true;
           $this->_status            = null;
   }

    /**
     * Test existence of row field
     *
     * @param  string  The column name.
     * @return boolean
     */
    public function __isset($column)
    {
        return array_key_exists($column, $this->_data);
    }

    /**
     * Unset a row field
     *
     * This function will reset required column to their default value, not required
     * fields will be unset.
     *
     * @param    string  The column name.
     * @return    void
     */
    public function __unset($column)
    {
        $field = KFactory::get($this->getTable())->getColumn($column);

        if(isset($field) && $field->required) {
            $this->_data[$column] = $field->default;
        }
        else
        {
            unset($this->_data[$column]);
            unset($this->_modified[$column]);
        }
    }

   /**
     * Returns an associative array of the raw data
      *
      * @param   boolean     If TRUE, only return the modified data. Default FALSE
      * @return  array
      */
     public function getData($modified = false)
      {
          if($modified) {
              $result = array_intersect_key($this->_data, $this->_modified);
          } else {
              $result = $this->_data;
          }

          return $result;
      }

      /**
       * Set the row data
       *
       * @param   mixed     Either and associative array, an object or a KDatabaseRow
       * @param   boolean If TRUE, update the modified information for each column being set.
       *                     Default TRUE
      * @return     KDatabaseRowAbstract
       */
       public function setData( $data, $modified = true )
       {
           if($data instanceof KDatabaseRowAbstract) {
            $data = $data->getData();
        } else {
            $data = (array) $data;
        }

        if($modified)
           {
               foreach($data as $column => $value) {
                   $this->$column = $value;
               }
           }
           else
           {
               $this->_data = array_merge($this->_data, $data);
           }

          return $this;
    }

    /**
     * Get a list of columns that have been modified
     *
     * @return array    An array of column names that have been modified
     */
    public function getModified()
    {
        return array_keys($this->_modified);
    }

    /**
     * Checks if the row is new or not
     *
     * @return bool
     */
    public function isNew()
    {
        return (bool) $this->_new;
    }

     /**
     * Search the mixin method map and call the method or trigger an error
     *
     * This functions overloads KObject::__call and implements a just in time
     *  mixin strategy. Available table behaviors are only mixed when needed.
     *
     * It's also capable of checking is a behavior has been mixed succesfully
     * using is[Behavior] function. If the behavior exists the function will
     * return TRUE, otherwise FALSE.
     *
        * @param  string     The function name
     * @param  array      The function arguments
     * @throws BadMethodCallException     If method could not be found
     * @return mixed The result of the function
     */
    public function __call($method, array $arguments)
    {
            //If the method hasn't been mixed yet, load all the behaviors
        if(!isset($this->_mixed_methods[$method]))
        {
            foreach(KFactory::get($this->getTable())->getBehaviors() as $behavior) {
                $this->mixin(KFactory::get($behavior));
            }
        }

        //If the method is of the formet is[Bahavior] handle it
        $parts = KInflector::explode($method);

        if($parts[0] == 'is' && isset($parts[1]))
        {
            if(isset($this->_mixed_methods[$method])) {
                return true;
            }

            return false;
        }


       return parent::__call($method, $arguments);
    }
}
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