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behavior.php

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<?php
/* SVN FILE: $Id: behavior_8php-source.html 580 2008-07-01 14:45:49Z gwoo $ */

/**
 * Model behaviors base class.
 *
 * Adds methods and automagic functionality to Cake Models.
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) :  Rapid Development Framework <http://www.cakephp.org/>
 * Copyright 2005-2008, Cake Software Foundation, Inc.
 *                              1785 E. Sahara Avenue, Suite 490-204
 *                              Las Vegas, Nevada 89104
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright       Copyright 2005-2008, Cake Software Foundation, Inc.
 * @link                http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package         cake
 * @subpackage      cake.cake.libs.model
 * @since           CakePHP(tm) v 1.2.0.0
 * @version         $Revision: 580 $
 * @modifiedby      $LastChangedBy: gwoo $
 * @lastmodified    $Date: 2008-07-01 09:45:49 -0500 (Tue, 01 Jul 2008) $
 * @license         http://www.opensource.org/licenses/mit-license.php The MIT License
 */
/**
 * Model behavior base class.
 *
 * Defines the Behavior interface, and contains common model interaction functionality.
 *
 * @package     cake
 * @subpackage  cake.cake.libs.model
 */
class ModelBehavior extends Object {
/**
 * Contains configuration settings for use with individual model objects.  This
 * is used because if multiple models use this Behavior, each will use the same
 * object instance.  Individual model settings should be stored as an
 * associative array, keyed off of the model name.
 *
 * @var array
 * @access public
 * @see Model::$alias
 */
    var $settings = array();
/**
 * Allows the mapping of preg-compatible regular expressions to public or
 * private methods in this class, where the array key is a /-delimited regular
 * expression, and the value is a class method.  Similar to the functionality of
 * the findBy* / findAllBy* magic methods.
 *
 * @var array
 * @access public
 */
    var $mapMethods = array();
/**
 * Setup this behavior with the specified configuration settings.
 *
 * @param object $model Model using this behavior
 * @param array $config Configuration settings for $model
 * @access public
 */
    function setup(&$model, $config = array()) { }
/**
 * Clean up any initialization this behavior has done on a model.  Called when a behavior is dynamically
 * detached from a model using Model::detach().
 *
 * @param object $model Model using this behavior
 * @access public
 * @see BehaviorCollection::detach()
 */
    function cleanup(&$model) {
        if (isset($this->settings[$model->alias])) {
            unset($this->settings[$model->alias]);
        }
    }
/**
 * Before find callback
 *
 * @param object $model Model using this behavior
 * @param array $queryData Data used to execute this query, i.e. conditions, order, etc.
 * @return boolean True if the operation should continue, false if it should abort
 * @access public
 */
    function beforeFind(&$model, $query) { }
/**
 * After find callback. Can be used to modify any results returned by find and findAll.
 *
 * @param object $model Model using this behavior
 * @param mixed $results The results of the find operation
 * @param boolean $primary Whether this model is being queried directly (vs. being queried as an association)
 * @return mixed Result of the find operation
 * @access public
 */
    function afterFind(&$model, $results, $primary) { }
/**
 * Before validate callback
 *
 * @param object $model Model using this behavior
 * @return boolean True if validate operation should continue, false to abort
 * @access public
 */
    function beforeValidate(&$model) { }
/**
 * Before save callback
 *
 * @param object $model Model using this behavior
 * @return boolean True if the operation should continue, false if it should abort
 * @access public
 */
    function beforeSave(&$model) { }
/**
 * After save callback
 *
 * @param object $model Model using this behavior
 * @param boolean $created True if this save created a new record
 * @access public
 */
    function afterSave(&$model, $created) { }
/**
 * Before delete callback
 *
 * @param object $model Model using this behavior
 * @param boolean $cascade If true records that depend on this record will also be deleted
 * @return boolean True if the operation should continue, false if it should abort
 * @access public
 */
    function beforeDelete(&$model, $cascade = true) { }
/**
 * After delete callback
 *
 * @param object $model Model using this behavior
 * @access public
 */
    function afterDelete(&$model) { }
/**
 * DataSource error callback
 *
 * @param object $model Model using this behavior
 * @param string $error Error generated in DataSource
 * @access public
 */
    function onError(&$model, $error) { }
/**
 * Overrides Object::dispatchMethod to account for PHP4's broken reference support
 *
 * @see Object::dispatchMethod
 * @access public
 */
    function dispatchMethod(&$model, $method, $params = array()) {
        if (empty($params)) {
            return $this->{$method}($model);
        }
        $params = array_values($params);

        switch (count($params)) {
            case 1:
                return $this->{$method}($model, $params[0]);
            case 2:
                return $this->{$method}($model, $params[0], $params[1]);
            case 3:
                return $this->{$method}($model, $params[0], $params[1], $params[2]);
            case 4:
                return $this->{$method}($model, $params[0], $params[1], $params[2], $params[3]);
            case 5:
                return $this->{$method}($model, $params[0], $params[1], $params[2], $params[3], $params[4]);
            default:
                array_unshift($params, $model);
                return call_user_func_array(array(&$this, $method), $params);
            break;
        }
    }
/**
 * If $model's whitelist property is non-empty, $field will be added to it.
 * Note: this method should *only* be used in beforeValidate or beforeSave to ensure
 * that it only modifies the whitelist for the current save operation.  Also make sure
 * you explicitly set the value of the field which you are allowing.
 *
 * @param object $model Model using this behavior
 * @param string $field Field to be added to $model's whitelist
 * @access protected
 * @return void
 */
    function _addToWhitelist(&$model, $field) {
        if (is_array($field)) {
            foreach ($field as $f) {
                $this->_addToWhitelist($model, $f);
            }
            return;
        }
        if (!empty($model->whitelist) && !in_array($field, $model->whitelist)) {
            $model->whitelist[] = $field;
        }
    }
}

/**
 * Model behavior collection class.
 *
 * Defines the Behavior interface, and contains common model interaction functionality.
 *
 * @package     cake
 * @subpackage  cake.cake.libs.model
 */
class BehaviorCollection extends Object {

/**
 * Stores a reference to the attached name
 *
 * @var object
 */
    var $modelName = null;
/**
 * Lists the currently-attached behavior objects
 *
 * @var array
 * @access private
 */
    var $_attached = array();
/**
 * Lists the currently-attached behavior objects which are disabled
 *
 * @var array
 * @access private
 */
    var $_disabled = array();
/**
 * Keeps a list of all methods of attached behaviors
 *
 * @var array
 */
    var $__methods = array();
/**
 * Keeps a list of all methods which have been mapped with regular expressions
 *
 * @var array
 */
    var $__mappedMethods = array();
/**
 * Attaches a model object and loads a list of behaviors
 *
 * @access public
 */
    function init($modelName, $behaviors = array()) {
        $this->modelName = $modelName;

        if (!empty($behaviors)) {
            foreach (Set::normalize($behaviors) as $behavior => $config) {
                $this->attach($behavior, $config);
            }
        }
    }
/**
 * Attaches a behavior to a model
 *
 * @param string $behavior CamelCased name of the behavior to load
 * @param array $config Behavior configuration parameters
 * @return boolean True on success, false on failure
 * @access public
 */
    function attach($behavior, $config = array()) {
        $name = $behavior;
        if (strpos($behavior, '.')) {
            list($plugin, $name) = explode('.', $behavior, 2);
        }
        $class = $name . 'Behavior';

        if (!App::import('Behavior', $behavior)) {
            return false;
        }

        if (!isset($this->{$name})) {
            if (PHP5) {
                $this->{$name} = new $class;
            } else {
                $this->{$name} =& new $class;
            }
        } elseif (isset($this->{$name}->settings) && isset($this->{$name}->settings[$this->modelName])) {
            if ($config !== null && $config !== false) {
                $config = array_merge($this->{$name}->settings[$this->modelName], $config);
            } else {
                $config = array();
            }
        }
        $this->{$name}->setup(ClassRegistry::getObject($this->modelName), $config);

        foreach ($this->{$name}->mapMethods as $method => $alias) {
            $this->__mappedMethods[$method] = array($alias, $name);
        }
        $methods = get_class_methods($this->{$name});
        $parentMethods = get_class_methods('ModelBehavior');
        $callbacks = array('setup', 'cleanup', 'beforeFind', 'afterFind', 'beforeSave', 'afterSave', 'beforeDelete', 'afterDelete', 'afterError');

        foreach ($methods as $m) {
            if (!in_array($m, $parentMethods)) {
                if ($m[0] != '_' && !array_key_exists($m, $this->__methods) && !in_array($m, $callbacks)) {
                    $this->__methods[$m] = array($m, $name);
                }
            }
        }

        if (!in_array($name, $this->_attached)) {
            $this->_attached[] = $name;
        }
        if (in_array($name, $this->_disabled) && !(isset($config['enabled']) && $config['enabled'] === false)) {
            $this->enable($name);
        } elseif (isset($config['enabled']) && $config['enabled'] === false) {
            $this->disable($name);
        }
        return true;
    }
/**
 * Detaches a behavior from a model
 *
 * @param string $name CamelCased name of the behavior to unload
 * @access public
 */
    function detach($name) {
        if (isset($this->{$name})) {
            $this->{$name}->cleanup(ClassRegistry::getObject($this->modelName));
            unset($this->{$name});
        }
        foreach ($this->__methods as $m => $callback) {
            if (is_array($callback) && $callback[1] == $name) {
                unset($this->__methods[$m]);
            }
        }
        $keys = array_combine(array_values($this->_attached), array_keys($this->_attached));
        unset($this->_attached[$keys[$name]]);
        $this->_attached = array_values($this->_attached);
    }
/**
 * Enables callbacks on a behavior or array of behaviors
 *
 * @param mixed $name CamelCased name of the behavior(s) to enable (string or array)
 * @return void
 * @access public
 */
    function enable($name) {
        $keys = array_combine(array_values($this->_disabled), array_keys($this->_disabled));
        foreach ((array)$name as $behavior) {
            unset($this->_disabled[$keys[$behavior]]);
        }
    }
/**
 * Disables callbacks on a behavior or array of behaviors.  Public behavior methods are still
 * callable as normal.
 *
 * @param mixed $name CamelCased name of the behavior(s) to disable (string or array)
 * @return void
 * @access public
 */
    function disable($name) {
        foreach ((array)$name as $behavior) {
            if (in_array($behavior, $this->_attached) && !in_array($behavior, $this->_disabled)) {
                $this->_disabled[] = $behavior;
            }
        }
    }
/**
 * Gets the list of currently-enabled behaviors, or, the current status of a single behavior
 *
 * @param string $name Optional.  The name of the behavior to check the status of.  If omitted,
 *                      returns an array of currently-enabled behaviors
 * @return mixed If $name is specified, returns the boolean status of the corresponding behavior.
 *               Otherwise, returns an array of all enabled behaviors.
 * @access public
 */
    function enabled($name = null) {
        if (!empty($name)) {
            return (in_array($name, $this->_attached) && !in_array($name, $this->_disabled));
        }
        return array_diff($this->_attached, $this->_disabled);
    }
/**
 * Dispatches a behavior method
 *
 * @return array All methods for all behaviors attached to this object
 * @access public
 */
    function dispatchMethod(&$model, $method, $params = array(), $strict = false) {
        $methods = array_map('strtolower', array_keys($this->__methods));
        $found = (in_array(strtolower($method), $methods));
        $call = null;

        if ($strict && !$found) {
            trigger_error("BehaviorCollection::dispatchMethod() - Method {$method} not found in any attached behavior", E_USER_WARNING);
            return null;
        } elseif ($found) {
            $methods = array_combine($methods, array_values($this->__methods));
            $call = $methods[strtolower($method)];
        } else {
            $count = count($this->__mappedMethods);
            $mapped = array_keys($this->__mappedMethods);

            for ($i = 0; $i < $count; $i++) {
                if (preg_match($mapped[$i] . 'i', $method)) {
                    $call = $this->__mappedMethods[$mapped[$i]];
                    array_unshift($params, $method);
                    break;
                }
            }
        }
        if (!empty($call)) {
            return $this->{$call[1]}->dispatchMethod($model, $call[0], $params);
        }
        return array('unhandled');
    }
/**
 * Dispatches a behavior callback on all attached behavior objects
 *
 * @param model $model
 * @param string $callback
 * @param array $params
 * @param array $options
 * @return mixed
 * @access public
 */
    function trigger(&$model, $callback, $params = array(), $options = array()) {
        if (empty($this->_attached)) {
            return true;
        }
        $_params = $params;
        $options = array_merge(array('break' => false, 'breakOn' => array(null, false), 'modParams' => false), $options);
        $count = count($this->_attached);

        for ($i = 0; $i < $count; $i++) {
            $name = $this->_attached[$i];
            if (in_array($name, $this->_disabled)) {
                continue;
            }
            $result = $this->{$name}->dispatchMethod($model, $callback, $params);

            if ($options['break'] && ($result === $options['breakOn'] || (is_array($options['breakOn']) && in_array($result, $options['breakOn'], true)))) {
                return $result;
            } elseif ($options['modParams'] && is_array($result)) {
                $params[0] = $result;
            }
        }
        if ($options['modParams'] && isset($params[0])) {
            return $params[0];
        }
        return true;
    }
/**
 * Gets the method list for attached behaviors, i.e. all public, non-callback methods
 *
 * @return array All public methods for all behaviors attached to this collection
 * @access public
 */
    function methods() {
        return $this->__methods;
    }
/**
 * Gets the list of attached behaviors, or, whether the given behavior is attached
 *
 * @param string $name Optional.  The name of the behavior to check the status of.  If omitted,
 *                      returns an array of currently-attached behaviors
 * @return mixed If $name is specified, returns the boolean status of the corresponding behavior.
 *               Otherwise, returns an array of all attached behaviors.
 * @access public
 */
    function attached($name = null) {
        if (!empty($name)) {
            return (in_array($name, $this->_attached));
        }
        return $this->_attached;
    }
}
?>

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