doctrine2/lib/Doctrine/Record.php

<?php
/*
 *  $Id$
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information, see
 * <http://www.phpdoctrine.com>.
 */
Doctrine::autoload('Doctrine_Access');
/**
 * Doctrine_Record
 * All record classes should inherit this super class
 *
 * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
 * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @package     Doctrine
 * @category    Object Relational Mapping
 * @link        www.phpdoctrine.com
 * @since       1.0
 * @version     $Revision$
 */
abstract class Doctrine_Record extends Doctrine_Access implements Countable, IteratorAggregate, Serializable
{
    /**
     * STATE CONSTANTS
     */

    /**
     * DIRTY STATE
     * a Doctrine_Record is in dirty state when its properties are changed
     */
    const STATE_DIRTY       = 1;
    /**
     * TDIRTY STATE
     * a Doctrine_Record is in transient dirty state when it is created and some of its fields are modified
     * but it is NOT yet persisted into database
     */
    const STATE_TDIRTY      = 2;
    /**
     * CLEAN STATE
     * a Doctrine_Record is in clean state when all of its properties are loaded from the database
     * and none of its properties are changed
     */
    const STATE_CLEAN       = 3;
    /**
     * PROXY STATE
     * a Doctrine_Record is in proxy state when its properties are not fully loaded
     */
    const STATE_PROXY       = 4;
    /**
     * NEW TCLEAN
     * a Doctrine_Record is in transient clean state when it is created and none of its fields are modified
     */
    const STATE_TCLEAN      = 5;
    /**
     * DELETED STATE
     * a Doctrine_Record turns into deleted state when it is deleted
     */
    const STATE_DELETED     = 6;
    /**
     * the following protected variables use '_' prefixes, the reason for this is to allow child
     * classes call for example $this->id, $this->state for getting the values of columns named 'id' and 'state'
     * rather than the values of these protected variables
     */
    /**
     * @var object Doctrine_Table $_table   the factory that created this data access object
     */
    protected $_table;
    /**
     * @var integer $_id                    the primary keys of this object
     */
    protected $_id           = array();
    /**
     * @var array $_data                    the record data
     */
    protected $_data         = array();
    /**
     * @var array $_values                  the values array, aggregate values and such are mapped into this array
     */
    protected $_values       = array();
    /**
     * @var integer $_state                 the state of this record
     * @see STATE_* constants
     */
    protected $_state;
    /**
     * @var array $_modified                an array containing properties that have been modified
     */
    protected $_modified     = array();
    /**
     * @var Doctrine_Validator_ErrorStack   error stack object
     */
    protected $_errorStack;
    /**
     * @var array $references               an array containing all the references
     */
    private $references     = array();
    /**
     * @var array $originals                an array containing all the original references
     */
    private $originals      = array();
    /**
     * @var integer $index                  this index is used for creating object identifiers
     */
    private static $index   = 1;
    /**
     * @var Doctrine_Null $null             a Doctrine_Null object used for extremely fast
     *                                      null value testing
     */
    private static $null;
    /**
     * @var integer $oid                    object identifier, each Record object has a unique object identifier
     */
    private $oid;

    /**
     * constructor
     * @param Doctrine_Table|null $table       a Doctrine_Table object or null,
     *                                         if null the table object is retrieved from current connection
     *
     * @param boolean $isNewEntry              whether or not this record is transient
     *
     * @throws Doctrine_Connection_Exception   if object is created using the new operator and there are no
     *                                         open connections
     * @throws Doctrine_Record_Exception       if the cleanData operation fails somehow
     */
    public function __construct($table = null, $isNewEntry = false)
    {
        if (isset($table) && $table instanceof Doctrine_Table) {
            $this->_table = $table;
            $exists = ( ! $isNewEntry);
        } else {
            $class  = get_class($this);
            // get the table of this class
            $this->_table = Doctrine_Manager::getInstance()->getConnectionForComponent($class)->getTable(get_class($this));
            $exists = false;
        }

        // Check if the current connection has the records table in its registry
        // If not this record is only used for creating table definition and setting up
        // relations.

        if ($this->_table->getConnection()->hasTable($this->_table->getComponentName())) {
            $this->oid = self::$index;

            self::$index++;

            $keys = $this->_table->getPrimaryKeys();

            if ( ! $exists) {
                // listen the onPreCreate event
                $this->_table->getAttribute(Doctrine::ATTR_LISTENER)->onPreCreate($this);
            } else {

                // listen the onPreLoad event
                $this->_table->getAttribute(Doctrine::ATTR_LISTENER)->onPreLoad($this);
            }
            // get the data array
            $this->_data = $this->_table->getData();

            // get the column count
            $count = count($this->_data);

            // clean data array
            $this->cleanData();

            $this->prepareIdentifiers($exists);

            if ( ! $exists) {
                if ($count > 0) {
                    $this->_state = Doctrine_Record::STATE_TDIRTY;
                } else {
                    $this->_state = Doctrine_Record::STATE_TCLEAN;
                }

                // set the default values for this record
                $this->setDefaultValues();

                // listen the onCreate event
                $this->_table->getAttribute(Doctrine::ATTR_LISTENER)->onCreate($this);

            } else {
                $this->_state      = Doctrine_Record::STATE_CLEAN;

                if ($count < $this->_table->getColumnCount()) {
                    $this->_state  = Doctrine_Record::STATE_PROXY;
                }

                // listen the onLoad event
                $this->_table->getAttribute(Doctrine::ATTR_LISTENER)->onLoad($this);
            }

            $this->_errorStack = new Doctrine_Validator_ErrorStack();

            $repository = $this->_table->getRepository();
            $repository->add($this);
        }
        $this->construct();
    }
    /**
     * initNullObject
     *
     * @param Doctrine_Null $null
     * @return void
     */
    public static function initNullObject(Doctrine_Null $null)
    {
        self::$null = $null;
    }
    /**
     * @return Doctrine_Null
     */
    public static function getNullObject()
    {
        return self::$null;
    }
    /**
     * setUp
     * this method is used for setting up relations and attributes
     * it should be implemented by child classes
     *
     * @return void
     */
    public function setUp()
    { }
    /**
     * construct
     * Empty tempalte method to provide concrete Record classes with the possibility
     * to hook into the constructor procedure
     *
     * @return void
     */
    public function construct()
    { }
    /**
     * getOID
     * returns the object identifier
     *
     * @return integer
     */
    public function getOID()
    {
        return $this->oid;
    }
    /**
     * isValid
     *
     * @return boolean                          whether or not this record passes all column validations
     */
    public function isValid()
    {
        if ( ! $this->_table->getAttribute(Doctrine::ATTR_VLD)) {
            return true;
        }
        // Clear the stack from any previous errors.
        $this->_errorStack->clear();

        // Run validation process
        $validator = new Doctrine_Validator();
        $validator->validateRecord($this);
        $this->validate();
        if ($this->_state == self::STATE_TDIRTY || $this->_state == self::STATE_TCLEAN) {
            $this->validateOnInsert();
        } else {
            $this->validateOnUpdate();
        }

        return $this->_errorStack->count() == 0 ? true : false;
    }
    /**
     * Emtpy template method to provide concrete Record classes with the possibility
     * to hook into the validation procedure, doing any custom / specialized
     * validations that are neccessary.
     */
    protected function validate()
    {}
    /**
     * Empty tempalte method to provide concrete Record classes with the possibility
     * to hook into the validation procedure only when the record is going to be
     * updated.
     */
    protected function validateOnUpdate()
    {}
    /**
     * Empty tempalte method to provide concrete Record classes with the possibility
     * to hook into the validation procedure only when the record is going to be
     * inserted into the data store the first time.
     */
    protected function validateOnInsert()
    {}
    /**
     * getErrorStack
     *
     * @return Doctrine_Validator_ErrorStack    returns the errorStack associated with this record
     */
    public function getErrorStack()
    {
        return $this->_errorStack;
    }
    /**
     * setDefaultValues
     * sets the default values for records internal data
     *
     * @param boolean $overwrite                whether or not to overwrite the already set values
     * @return boolean
     */
    public function setDefaultValues($overwrite = false)
    {
        if ( ! $this->_table->hasDefaultValues()) {
            return false;
        }
        foreach ($this->_data as $column => $value) {
            $default = $this->_table->getDefaultValueOf($column);

            if ($default === null)
                $default = self::$null;

            if ($value === self::$null || $overwrite) {
                $this->_data[$column] = $default;
                $this->_modified[]    = $column;
                $this->_state = Doctrine_Record::STATE_TDIRTY;
            }
        }
    }
    /**
     * cleanData
     * this method does several things to records internal data
     *
     * 1. It unserializes array and object typed columns
     * 2. Uncompresses gzip typed columns
     * 3. Gets the appropriate enum values for enum typed columns
     * 4. Initializes special null object pointer for null values (for fast column existence checking purposes)
     *
     *
     * example:
     *
     * $data = array("name"=>"John","lastname"=> null, "id" => 1,"unknown" => "unknown");
     * $names = array("name", "lastname", "id");
     * $data after operation:
     * $data = array("name"=>"John","lastname" => Object(Doctrine_Null));
     *
     * here column 'id' is removed since its auto-incremented primary key (read-only)
     *
     * @throws Doctrine_Record_Exception        if unserialization of array/object typed column fails or
     *                                          if uncompression of gzip typed column fails
     *
     * @return integer
     */
    private function cleanData($debug = false)
    {
        $tmp = $this->_data;

        $this->_data = array();

        $count = 0;

        foreach ($this->_table->getColumnNames() as $name) {
            $type = $this->_table->getTypeOf($name);

            if ( ! isset($tmp[$name])) {
                $this->_data[$name] = self::$null;
            } else {
                switch ($type) {
                    case "array":
                    case "object":
                        if ($tmp[$name] !== self::$null) {
                            if (is_string($tmp[$name])) {
                                $value = unserialize($tmp[$name]);

                                if ($value === false)
                                    throw new Doctrine_Record_Exception("Unserialization of $name failed.");
                            } else {
                                $value = $tmp[$name];
                            }
                            $this->_data[$name] = $value;
                        }
                        break;
                    case "gzip":
                        if ($tmp[$name] !== self::$null) {
                            $value = gzuncompress($tmp[$name]);

                            if ($value === false)
                                throw new Doctrine_Record_Exception("Uncompressing of $name failed.");

                            $this->_data[$name] = $value;
                        }
                        break;
                    case "enum":
                        $this->_data[$name] = $this->_table->enumValue($name, $tmp[$name]);
                        break;
                    default:
                        $this->_data[$name] = $tmp[$name];
                };
                $count++;
            }
        }

        return $count;
    }
    /**
     * prepareIdentifiers
     * prepares identifiers for later use
     *
     * @param boolean $exists               whether or not this record exists in persistent data store
     * @return void
     */
    private function prepareIdentifiers($exists = true)
    {
        switch ($this->_table->getIdentifierType()) {
            case Doctrine_Identifier::AUTO_INCREMENT:
            case Doctrine_Identifier::SEQUENCE:
                $name = $this->_table->getIdentifier();

                if ($exists) {
                    if (isset($this->_data[$name]) && $this->_data[$name] !== self::$null) {
                        $this->_id[$name] = $this->_data[$name];
                    }
                }

                unset($this->_data[$name]);

                break;
            case Doctrine_Identifier::NORMAL:
                $this->_id   = array();
                $name       = $this->_table->getIdentifier();

                if (isset($this->_data[$name]) && $this->_data[$name] !== self::$null) {
                    $this->_id[$name] = $this->_data[$name];
                }
                break;
            case Doctrine_Identifier::COMPOSITE:
                $names      = $this->_table->getIdentifier();

                foreach ($names as $name) {
                    if ($this->_data[$name] === self::$null) {
                        $this->_id[$name] = null;
                    } else {
                        $this->_id[$name] = $this->_data[$name];
                    }
                }
                break;
        };
    }
    /**
     * serialize
     * this method is automatically called when this Doctrine_Record is serialized
     *
     * @return array
     */
    public function serialize()
    {
        $this->_table->getAttribute(Doctrine::ATTR_LISTENER)->onSleep($this);

        $vars = get_object_vars($this);

        unset($vars['references']);
        unset($vars['originals']);
        unset($vars['_table']);

        $name = $this->_table->getIdentifier();
        $this->_data = array_merge($this->_data, $this->_id);

        foreach ($this->_data as $k => $v) {
            if ($v instanceof Doctrine_Record) {
                unset($vars['_data'][$k]);
            } elseif ($v === self::$null) {
                unset($vars['_data'][$k]);
            } else {
                switch ($this->_table->getTypeOf($k)) {
                    case "array":
                    case "object":
                        $vars['_data'][$k] = serialize($vars['_data'][$k]);
                        break;
                };
            }
        }

        return serialize($vars);
    }
    /**
     * unseralize
     * this method is automatically called everytime a Doctrine_Record object is unserialized
     *
     * @param string $serialized                Doctrine_Record as serialized string
     * @throws Doctrine_Record_Exception        if the cleanData operation fails somehow
     * @return void
     */
    public function unserialize($serialized)
    {
        $manager    = Doctrine_Manager::getInstance();
        $connection    = $manager->getCurrentConnection();

        $this->oid  = self::$index;
        self::$index++;

        $this->_table = $connection->getTable(get_class($this));

        $array = unserialize($serialized);

        foreach ($array as $name => $values) {
            $this->$name = $values;
        }

        $this->_table->getRepository()->add($this);

        $this->cleanData();

        $this->prepareIdentifiers($this->exists());

        $this->_table->getAttribute(Doctrine::ATTR_LISTENER)->onWakeUp($this);
    }
    /**
     * getState
     * returns the current state of the object
     *
     * @see Doctrine_Record::STATE_* constants
     * @return integer
     */
    public function getState()
    {
        return $this->_state;
    }
    /**
     * state
     * returns / assigns the state of this record
     *
     * @param integer|string $state                 if set, this method tries to set the record state to $state
     * @see Doctrine_Record::STATE_* constants
     *
     * @throws Doctrine_Record_State_Exception      if trying to set an unknown state
     * @return null|integer
     */
    public function state($state = null)
    {
        if ($state == null) {
            return $this->_state;
        }
        $err = false;
        if (is_integer($state)) {

            if ($state >= 1 && $state <= 6) {
                $this->_state = $state;
            } else {
                $err = true;
            }
        } elseif (is_string($state)) {
            $upper = strtoupper($state);
            switch ($upper) {
                case 'DIRTY':
                case 'CLEAN':
                case 'TDIRTY':
                case 'TCLEAN':
                case 'PROXY':
                case 'DELETED':
                    $this->_state = constant('Doctrine_Record::STATE_' . $upper);
                    break;
                default:
                    $err = true;
            }
        }

        if ($err)
            throw new Doctrine_Record_State_Exception('Unknown record state ' . $state);
    }
    /**
     * refresh
     * refresh internal data from the database
     *
     * @throws Doctrine_Record_Exception        When the refresh operation fails (when the database row
     *                                          this record represents does not exist anymore)
     * @return boolean
     */
    final public function refresh()
    {
        $id = $this->obtainIdentifier();
        if ( ! is_array($id)) {
            $id = array($id);
        }
        if (empty($id)) {
            return false;
        }
        $id = array_values($id);

        $query          = $this->_table->getQuery()." WHERE ".implode(" = ? AND ",$this->_table->getPrimaryKeys())." = ?";
        $stmt           = $this->_table->getConnection()->execute($query,$id);

        $this->_data     = $stmt->fetch(PDO::FETCH_ASSOC);

        if ( ! $this->_data)
            throw new Doctrine_Record_Exception('Failed to refresh. Record does not exist anymore');

        $this->_data     = array_change_key_case($this->_data, CASE_LOWER);

        $this->_modified = array();
        $this->cleanData(true);

        $this->prepareIdentifiers();

        $this->_state    = Doctrine_Record::STATE_CLEAN;

        $this->_table->getAttribute(Doctrine::ATTR_LISTENER)->onLoad($this);

        return true;
    }
    /**
     * factoryRefresh
     * refreshes the data from outer source (Doctrine_Table)
     *
     * @throws Doctrine_Record_Exception        When the primary key of this record doesn't match the primary key fetched from a collection
     * @return void
     */
    final public function factoryRefresh()
    {
        $this->_data = $this->_table->getData();
        $old  = $this->_id;

        $this->cleanData();

        $this->prepareIdentifiers();

        if ($this->_id != $old)
            throw new Doctrine_Record_Exception("The refreshed primary key doesn't match the one in the record memory.", Doctrine::ERR_REFRESH);

        $this->_state    = Doctrine_Record::STATE_CLEAN;
        $this->_modified = array();

        $this->_table->getAttribute(Doctrine::ATTR_LISTENER)->onLoad($this);
    }
    /**
     * getTable
     * returns the table object for this record
     *
     * @return object Doctrine_Table        a Doctrine_Table object
     */
    final public function getTable()
    {
        return $this->_table;
    }
    /**
     * getData
     * return all the internal data
     *
     * @return array                        an array containing all the properties
     */
    final public function getData()
    {
        return $this->_data;
    }
    /**
     * rawGet
     * returns the value of a property, if the property is not yet loaded
     * this method does NOT load it
     *
     * @param $name                         name of the property
     * @throws Doctrine_Record_Exception    if trying to get an unknown property
     * @return mixed
     */

    public function rawGet($name)
    {
        if ( ! isset($this->_data[$name])) {
            throw new Doctrine_Record_Exception('Unknown property '. $name);
        }
        if ($this->_data[$name] === self::$null)
            return null;

        return $this->_data[$name];
    }

    /**
     * load
     * loads all the unitialized properties from the database
     *
     * @return boolean
     */
    public function load()
    {
        // only load the data from database if the Doctrine_Record is in proxy state
        if ($this->_state == Doctrine_Record::STATE_PROXY) {
            $this->refresh();

            $this->_state = Doctrine_Record::STATE_CLEAN;

            return true;
        }
        return false;
    }
    /**
     * get
     * returns a value of a property or a related component
     *
     * @param mixed $name                       name of the property or related component
     * @param boolean $invoke                   whether or not to invoke the onGetProperty listener
     * @throws Doctrine_Record_Exception        if trying to get a value of unknown property / related component
     * @return mixed
     */
    public function get($name, $invoke = true)
    {

        $listener = $this->_table->getAttribute(Doctrine::ATTR_LISTENER);
        $value    = self::$null;
        $lower    = strtolower($name);

        if (isset($this->_data[$lower])) {
            // check if the property is null (= it is the Doctrine_Null object located in self::$null)
            if ($this->_data[$lower] === self::$null) {
                $this->load();
            }

            if ($this->_data[$lower] === self::$null) {
                $value = null;
            } else {
                $value = $this->_data[$lower];
            }

        }

        if ($value !== self::$null) {
            $value = $this->_table->invokeGet($this, $name, $value);

            if ($invoke && $name !== $this->_table->getIdentifier()) {
                return $this->_table->getAttribute(Doctrine::ATTR_LISTENER)->onGetProperty($this, $name, $value);
            } else {
                return $value;
            }
            return $value;
        }

        if (isset($this->_id[$lower])) {
            return $this->_id[$lower];
        }
        if ($name === $this->_table->getIdentifier()) {
            return null;
        }
        if (isset($this->_values[$lower])) {
            return $this->_values[$lower];
        }
        $rel = $this->_table->getRelation($name);

        try {
            if ( ! isset($this->references[$name])) {
                $this->loadReference($name);
            }
        } catch(Doctrine_Table_Exception $e) {
            throw new Doctrine_Record_Exception("Unknown property / related component '$name'.");
        }

        return $this->references[$name];
    }
    /**
     * mapValue
     * This simple method is used for mapping values to $values property.
     * Usually this method is used internally by Doctrine for the mapping of
     * aggregate values.
     *
     * @param string $name                  the name of the mapped value
     * @param mixed $value                  mixed value to be mapped
     * @return void
     */
    public function mapValue($name, $value)
    {
        $name = strtolower($name);
        $this->_values[$name] = $value;
    }
    /**
     * set
     * method for altering properties and Doctrine_Record references
     * if the load parameter is set to false this method will not try to load uninitialized record data
     *
     * @param mixed $name                   name of the property or reference
     * @param mixed $value                  value of the property or reference
     * @param boolean $load                 whether or not to refresh / load the uninitialized record data
     *
     * @throws Doctrine_Record_Exception    if trying to set a value for unknown property / related component
     * @throws Doctrine_Record_Exception    if trying to set a value of wrong type for related component
     *
     * @return Doctrine_Record
     */
    public function set($name, $value, $load = true)
    {
        $lower = strtolower($name);

        if (isset($this->_data[$lower])) {
            if ($value instanceof Doctrine_Record) {
                $id = $value->getIncremented();

                if ($id !== null)
                    $value = $id;
            }

            if ($load) {
                $old = $this->get($lower, false);
            } else {
                $old = $this->_data[$lower];
            }

            if ($old !== $value) {
                $value = $this->_table->invokeSet($this, $name, $value);

                $value = $this->_table->getAttribute(Doctrine::ATTR_LISTENER)->onSetProperty($this, $name, $value);

                if ($value === null)
                    $value = self::$null;

                $this->_data[$lower] = $value;
                $this->_modified[]   = $lower;
                switch ($this->_state) {
                    case Doctrine_Record::STATE_CLEAN:
                        $this->_state = Doctrine_Record::STATE_DIRTY;
                        break;
                    case Doctrine_Record::STATE_TCLEAN:
                        $this->_state = Doctrine_Record::STATE_TDIRTY;
                        break;
                };
            }
        } else {
            try {
                $this->coreSetRelated($name, $value);
            } catch(Doctrine_Table_Exception $e) {
                throw new Doctrine_Record_Exception("Unknown property / related component '$name'.");
            }
        }
    }

    public function coreSetRelated($name, $value)
    {
        $rel = $this->_table->getRelation($name);

        // one-to-many or one-to-one relation
        if ($rel instanceof Doctrine_Relation_ForeignKey ||
           $rel instanceof Doctrine_Relation_LocalKey) {
            if ( ! $rel->isOneToOne()) {
                // one-to-many relation found
                if ( ! ($value instanceof Doctrine_Collection)) {
                    throw new Doctrine_Record_Exception("Couldn't call Doctrine::set(), second argument should be an instance of Doctrine_Collection when setting one-to-many references.");
                }
                $value->setReference($this,$rel);
            } else {
                // one-to-one relation found
                if ( ! ($value instanceof Doctrine_Record)) {
                    throw new Doctrine_Record_Exception("Couldn't call Doctrine::set(), second argument should be an instance of Doctrine_Record when setting one-to-one references.");
                }
                if ($rel instanceof Doctrine_Relation_LocalKey) {
                    $this->set($rel->getLocal(), $value, false);
                } else {
                    $value->set($rel->getForeign(), $this, false);
                }
            }

        } elseif ($rel instanceof Doctrine_Relation_Association) {
            // join table relation found
            if ( ! ($value instanceof Doctrine_Collection)) {
                throw new Doctrine_Record_Exception("Couldn't call Doctrine::set(), second argument should be an instance of Doctrine_Collection when setting many-to-many references.");
            }
        }

        $this->references[$name] = $value;
    }
    /**
     * contains
     *
     * @param string $name
     * @return boolean
     */
    public function contains($name)
    {
        $lower = strtolower($name);

        if (isset($this->_data[$lower])) {
            return true;
        }
        if (isset($this->_id[$lower])) {
            return true;
        }
        if (isset($this->references[$name])) {
            return true;
        }
        return false;
    }
    /**
     * @param string $name
     * @return void
     */
    public function __unset($name)
    {
        if (isset($this->_data[$name])) {
            $this->_data[$name] = array();
        }
        // todo: what to do with references ?
    }
    /**
     * applies the changes made to this object into database
     * this method is smart enough to know if any changes are made
     * and whether to use INSERT or UPDATE statement
     *
     * this method also saves the related components
     *
     * @param Doctrine_Connection $conn                 optional connection parameter
     * @return void
     */
    public function save(Doctrine_Connection $conn = null)
    {
        if ($conn === null) {
            $conn = $this->_table->getConnection();
        }
        $conn->beginTransaction();

        $saveLater = $conn->unitOfWork->saveRelated($this);

        if ($this->isValid()) {
            $conn->save($this);
        } else {
            $conn->transaction->addInvalid($this);
        }

        foreach ($saveLater as $fk) {
            $table   = $fk->getTable();
            $alias   = $this->_table->getAlias($table->getComponentName());

            if (isset($this->references[$alias])) {
                $obj = $this->references[$alias];
                $obj->save();
            }
        }

        // save the MANY-TO-MANY associations

        $conn->unitOfWork->saveAssociations($this);
        //$this->saveAssociations();

        $conn->commit();
    }
    /**
     * replace
     * Execute a SQL REPLACE query. A REPLACE query is identical to a INSERT
     * query, except that if there is already a row in the table with the same
     * key field values, the REPLACE query just updates its values instead of
     * inserting a new row.
     *
     * The REPLACE type of query does not make part of the SQL standards. Since
     * practically only MySQL and SQLIte implement it natively, this type of
     * query isemulated through this method for other DBMS using standard types
     * of queries inside a transaction to assure the atomicity of the operation.
     *
     * @param Doctrine_Connection $conn             optional connection parameter
     * @throws Doctrine_Connection_Exception        if some of the key values was null
     * @throws Doctrine_Connection_Exception        if there were no key fields
     * @throws PDOException                         if something fails at PDO level
     * @return integer                              number of rows affected
     */
    public function replace(Doctrine_Connection $conn = null)
    {
        if ($conn === null) {
            $conn = $this->_table->getConnection();
        }

        return $conn->replace($this->_table->getTableName(), $this->getPrepared(), $this->id);
    }
    /**
     * returns an array of modified fields and associated values
     * @return array
     */
    public function getModified()
    {
        $a = array();

        foreach ($this->_modified as $k => $v) {
            $a[$v] = $this->_data[$v];
        }
        return $a;
    }
    /**
     * getPrepared
     *
     * returns an array of modified fields and values with data preparation
     * adds column aggregation inheritance and converts Records into primary key values
     *
     * @param array $array
     * @return array
     */
    public function getPrepared(array $array = array()) {
        $a = array();

        if (empty($array)) {
            $array = $this->_modified;
        }
        foreach ($array as $k => $v) {
            $type = $this->_table->getTypeOf($v);

            if ($this->_data[$v] === self::$null) {
                $a[$v] = null;
                continue;
            }

            switch ($type) {
                case 'array':
                case 'object':
                    $a[$v] = serialize($this->_data[$v]);
                    break;
                case 'gzip':
                    $a[$v] = gzcompress($this->_data[$v],5);
                    break;
                case 'boolean':
                    $a[$v] = (int) $this->_data[$v];
                break;
                case 'enum':
                    $a[$v] = $this->_table->enumIndex($v,$this->_data[$v]);
                    break;
                default:
                    if ($this->_data[$v] instanceof Doctrine_Record)
                        $this->_data[$v] = $this->_data[$v]->getIncremented();

                    $a[$v] = $this->_data[$v];
            }
        }

        foreach ($this->_table->getInheritanceMap() as $k => $v) {
            $old = $this->get($k, false);

            if ((string) $old !== (string) $v || $old === null) {
                $a[$k] = $v;
                $this->_data[$k] = $v;
            }
        }

        return $a;
    }
    /**
     * count
     * this class implements countable interface
     *
     * @return integer          the number of columns in this record
     */
    public function count()
    {
        return count($this->_data);
    }
    /**
     * alias for count()
     *
     * @return integer          the number of columns in this record
     */
    public function columnCount()
    {
        return $this->count();
    }
    /**
     * toArray
     * returns the record as an array
     *
     * @return array
     */
    public function toArray()
    {
        $a = array();

        foreach ($this as $column => $value) {
            $a[$column] = $value;
        }
        if ($this->_table->getIdentifierType() == Doctrine_Identifier::AUTO_INCREMENT) {
            $i      = $this->_table->getIdentifier();
            $a[$i]  = $this->getIncremented();
        }
        return $a;
    }
    /**
     * exists
     * returns true if this record is persistent, otherwise false
     *
     * @return boolean
     */
    public function exists()
    {
        return ($this->_state !== Doctrine_Record::STATE_TCLEAN &&
                $this->_state !== Doctrine_Record::STATE_TDIRTY);
    }
    /**
     * method for checking existence of properties and Doctrine_Record references
     * @param mixed $name               name of the property or reference
     * @return boolean
     */
    public function hasRelation($name)
    {
        if (isset($this->_data[$name]) || isset($this->_id[$name])) {
            return true;
        }
        return $this->_table->hasRelation($name);
    }
    /**
     * getIterator
     * @return Doctrine_Record_Iterator     a Doctrine_Record_Iterator that iterates through the data
     */
    public function getIterator()
    {
        return new Doctrine_Record_Iterator($this);
    }
    /**
     * getOriginals
     * returns an original collection of related component
     *
     * @return Doctrine_Collection|false
     */
    public function obtainOriginals($name)
    {
        if (isset($this->originals[$name])) {
            return $this->originals[$name];
        }
        return false;
    }
    /**
     * deletes this data access object and all the related composites
     * this operation is isolated by a transaction
     *
     * this event can be listened by the onPreDelete and onDelete listeners
     *
     * @return boolean      true on success, false on failure
     */
    public function delete(Doctrine_Connection $conn = null)
    {
        if ($conn == null) {
            $conn = $this->_table->getConnection();
        }
        return $conn->delete($this);
    }
    /**
     * copy
     * returns a copy of this object
     *
     * @return Doctrine_Record
     */
    public function copy()
    {
        $ret = $this->_table->create($this->_data);
        $modified = array();
        foreach ($this->_data as $key => $val) {
            if (!($val instanceof Doctrine_Null)) {
                $ret->_modified[] = $key;
            }
        }
        return $ret;
    }
    /**
     * assignIdentifier
     *
     * @param integer $id
     * @return void
     */
    final public function assignIdentifier($id = false)
    {
        if ($id === false) {
            $this->_id       = array();
            $this->cleanData();
            $this->_state    = Doctrine_Record::STATE_TCLEAN;
            $this->_modified = array();
        } elseif ($id === true) {
            $this->prepareIdentifiers(false);
            $this->_state    = Doctrine_Record::STATE_CLEAN;
            $this->_modified = array();
        } else {
            $name            = $this->_table->getIdentifier();

            $this->_id[$name] = $id;
            $this->_state     = Doctrine_Record::STATE_CLEAN;
            $this->_modified  = array();
        }
    }
    /**
     * assignOriginals
     *
     * @param string $alias
     * @param Doctrine_Collection $coll
     * @return void
     */
    public function assignOriginals($alias, Doctrine_Collection $coll)
    {
        $this->originals[$alias] = $coll;
    }
    /**
     * returns the primary keys of this object
     *
     * @return array
     */
    final public function obtainIdentifier()
    {
        return $this->_id;
    }
    /**
     * returns the value of autoincremented primary key of this object (if any)
     *
     * @return integer
     */
    final public function getIncremented()
    {
        $id = current($this->_id);
        if ($id === false)
            return null;

        return $id;
    }
    /**
     * getLast
     * this method is used internally be Doctrine_Query
     * it is needed to provide compatibility between
     * records and collections
     *
     * @return Doctrine_Record
     */
    public function getLast()
    {
        return $this;
    }
    /**
     * hasRefence
     * @param string $name
     * @return boolean
     */
    public function hasReference($name)
    {
        return isset($this->references[$name]);
    }
    /**
     * obtainReference
     *
     * @param string $name
     * @throws Doctrine_Record_Exception        if trying to get an unknown related component
     */
    public function obtainReference($name)
    {
        if (isset($this->references[$name])) {
            return $this->references[$name];
        }
        throw new Doctrine_Record_Exception("Unknown reference $name");
    }
    /**
     * initalizes a one-to-many / many-to-many relation
     *
     * @param Doctrine_Collection $coll
     * @param Doctrine_Relation $connector
     * @return boolean
     */
    public function initReference(Doctrine_Collection $coll, Doctrine_Relation $connector)
    {
        $alias = $connector->getAlias();

        if (isset($this->references[$alias])) {
            return false;
        }
        if ( ! $connector->isOneToOne()) {
            if ( ! ($connector instanceof Doctrine_Relation_Association)) {
                $coll->setReference($this, $connector);
            }
            $this->references[$alias] = $coll;
            $this->originals[$alias]  = clone $coll;

            return true;
        }
        return false;
    }

    public function lazyInitRelated(Doctrine_Collection $coll, Doctrine_Relation $connector)
    {

    }
    /**
     * addReference
     * @param Doctrine_Record $record
     * @param mixed $key
     * @return void
     */
    public function addReference(Doctrine_Record $record, Doctrine_Relation $connector, $key = null)
    {
        $alias = $connector->getAlias();

        $this->references[$alias]->add($record, $key);
        $this->originals[$alias]->add($record, $key);
    }
    /**
     * getReferences
     * @return array    all references
     */
    public function getReferences()
    {
        return $this->references;
    }
    /**
     * setRelated
     *
     * @param string $alias
     * @param Doctrine_Access $coll
     */
    final public function setRelated($alias, Doctrine_Access $coll)
    {
        $this->references[$alias] = $coll;
        $this->originals[$alias]  = $coll;
    }
    /**
     * loadReference
     * loads a related component
     *
     * @throws Doctrine_Table_Exception             if trying to load an unknown related component
     * @param string $name
     * @return void
     */
    final public function loadReference($name)
    {
        $fk      = $this->_table->getRelation($name);

        if ($fk->isOneToOne()) {
            $this->references[$name] = $fk->fetchRelatedFor($this);
        } else {
            $coll = $fk->fetchRelatedFor($this);

            $this->references[$name] = $coll;
            $this->originals[$name]  = clone $coll;
        }
    }
    /**
     * binds One-to-One composite relation
     *
     * @param string $objTableName
     * @param string $fkField
     * @return void
     */
    final public function ownsOne($componentName, $foreignKey, $localKey = null)
    {
        $this->_table->bind($componentName, $foreignKey, Doctrine_Relation::ONE_COMPOSITE, $localKey);
    }
    /**
     * binds One-to-Many composite relation
     *
     * @param string $objTableName
     * @param string $fkField
     * @return void
     */
    final public function ownsMany($componentName,$foreignKey, $localKey = null)
    {
        $this->_table->bind($componentName, $foreignKey, Doctrine_Relation::MANY_COMPOSITE, $localKey);
    }
    /**
     * binds One-to-One aggregate relation
     *
     * @param string $objTableName
     * @param string $fkField
     * @return void
     */
    final public function hasOne($componentName,$foreignKey, $localKey = null)
    {
        $this->_table->bind($componentName, $foreignKey, Doctrine_Relation::ONE_AGGREGATE, $localKey);
    }
    /**
     * binds One-to-Many aggregate relation
     *
     * @param string $objTableName
     * @param string $fkField
     * @return void
     */
    final public function hasMany($componentName,$foreignKey, $localKey = null)
    {
        $this->_table->bind($componentName, $foreignKey, Doctrine_Relation::MANY_AGGREGATE, $localKey);
    }
    /**
     * setPrimaryKey
     * @param mixed $key
     */
    final public function setPrimaryKey($key)
    {
        $this->_table->setPrimaryKey($key);
    }
    /**
     * hasColumn
     * sets a column definition
     *
     * @param string $name
     * @param string $type
     * @param integer $length
     * @param mixed $options
     * @return void
     */
    final public function hasColumn($name, $type, $length = 2147483647, $options = "")
    {
        $this->_table->setColumn($name, $type, $length, $options);
    }
    /**
     * countRelated
     *
     * @param string $name      the name of the related component
     * @return integer
     */
    public function countRelated($name)
    {
        $rel            = $this->_table->getRelation($name);
        $componentName  = $rel->getTable()->getComponentName();
        $alias          = $rel->getTable()->getAlias(get_class($this));
        $query          = new Doctrine_Query();
        $query->from($componentName. '(' . 'COUNT(1)' . ')')->where($componentName. '.' .$alias. '.' . $this->getTable()->getIdentifier(). ' = ?');
        $array = $query->execute(array($this->getIncremented()));
        return $array[0]['COUNT(1)'];
    }
    /**
     * merge
     * merges this record with an array of values
     *
     * @param array $values
     * @return void
     */
    public function merge(array $values)
    {
        foreach ($this->_table->getColumnNames() as $value) {
            try {
                if (isset($values[$value])) {
                    $this->set($value, $values[$value]);
                }
            } catch(Exception $e) {
                // silence all exceptions
            }
        }
    }
    public function setAttribute($attr, $value)
    {
        $this->_table->setAttribute($attr, $value);
    }
    public function setTableName($tableName)
    {
        $this->_table->setTableName($tableName);
    }
    public function setInheritanceMap($map)
    {
        $this->_table->setOption('inheritanceMap', $map);
    }
    public function setEnumValues($column, $values)
    {
        $this->_table->setEnumValues($column, $values);
    }
    public function option($name, $value = null)
    {
        if ($value == null) {
            $this->_table->getOption($name);
        } else {
            $this->_table->setOption($name, $value);
        }
    }
    public function hasIndex($name )
    {

    }
    public function actsAsTree($treeImplName, $args)
    {

    }
    /**
     * addListener
     *
     * @param Doctrine_Db_EventListener_Interface|Doctrine_Overloadable $listener
     * @return Doctrine_Db
     */
    public function addListener($listener, $name = null)
    {
        $this->_table->addListener($listener, $name = null);
        return $this;
    }
    /**
     * getListener
     *
     * @return Doctrine_Db_EventListener_Interface|Doctrine_Overloadable
     */
    public function getListener()
    {
        return $this->_table->getListener();
    }
    /**
     * setListener
     *
     * @param Doctrine_Db_EventListener_Interface|Doctrine_Overloadable $listener
     * @return Doctrine_Db
     */
    public function setListener($listener)
    {
        $this->_table->setListener($listener);
        return $this;
    }
    /**
     * call
     *
     * @param string|array $callback    valid callback
     * @param string $column            column name
     * @param mixed arg1 ... argN       optional callback arguments
     * @return Doctrine_Record
     */
    public function call($callback, $column)
    {
        $args = func_get_args();
        array_shift($args);

        if (isset($args[0])) {
            $column = $args[0];
            $args[0] = $this->get($column);

            $newvalue = call_user_func_array($callback, $args);

            $this->_data[$column] = $newvalue;
        }
        return $this;
    }
    /**
     * returns a string representation of this object
     */
    public function __toString()
    {
        return Doctrine_Lib::getRecordAsString($this);
    }
}