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<?php

/**

 * Model behaviors base class.

 *

 * Adds methods and automagic functionality to CakePHP Models.

 *

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @package       Cake.Model

 * @since         CakePHP(tm) v 1.2.0.0

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

/**

 * Model behavior base class.

 *

 * Defines the Behavior interface, and contains common model interaction functionality. Behaviors

 * allow you to simulate mixins, and create reusable blocks of application logic, that can be reused across

 * several models. Behaviors also provide a way to hook into model callbacks and augment their behavior.

 *

 * ### Mixin methods

 *

 * Behaviors can provide mixin like features by declaring public methods. These methods should expect

 * the model instance to be shifted onto the parameter list.

 *

 * ```

 * function doSomething(Model $model, $arg1, $arg2) {

 *		//do something

 * }

 * ```

 *

 * Would be called like `$this->Model->doSomething($arg1, $arg2);`.

 *

 * ### Mapped methods

 *

 * Behaviors can also define mapped methods. Mapped methods use pattern matching for method invocation. This

 * allows you to create methods similar to Model::findAllByXXX methods on your behaviors. Mapped methods need to

 * be declared in your behaviors `$mapMethods` array. The method signature for a mapped method is slightly different

 * than a normal behavior mixin method.

 *

 * ```

 * public $mapMethods = array('/do(\w+)/' => 'doSomething');

 *

 * function doSomething(Model $model, $method, $arg1, $arg2) {

 *		//do something

 * }

 * ```

 *

 * The above will map every doXXX() method call to the behavior. As you can see, the model is

 * still the first parameter, but the called method name will be the 2nd parameter. This allows

 * you to munge the method name for additional information, much like Model::findAllByXX.

 *

 * @package       Cake.Model

 * @see Model::$actsAs

 * @see BehaviorCollection::load()

 */

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

 * @see Model::$alias

 */

	public $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

 */

	public $mapMethods = array();

/**

 * Setup this behavior with the specified configuration settings.

 *

 * @param Model $model Model using this behavior

 * @param array $config Configuration settings for $model

 * @return void

 */

	public function setup(Model $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 Model $model Model using this behavior

 * @return void

 * @see BehaviorCollection::detach()

 */

	public function cleanup(Model $model) {

		if (isset($this->settings[$model->alias])) {

			unset($this->settings[$model->alias]);

		}

	}

/**

 * beforeFind can be used to cancel find operations, or modify the query that will be executed.

 * By returning null/false you can abort a find. By returning an array you can modify/replace the query

 * that is going to be run.

 *

 * @param Model $model Model using this behavior

 * @param array $query Data used to execute this query, i.e. conditions, order, etc.

 * @return bool|array False or null will abort the operation. You can return an array to replace the

 *   $query that will be eventually run.

 */

	public function beforeFind(Model $model, $query) {

		return true;

	}

/**

 * After find callback. Can be used to modify any results returned by find.

 *

 * @param Model $model Model using this behavior

 * @param mixed $results The results of the find operation

 * @param bool $primary Whether this model is being queried directly (vs. being queried as an association)

 * @return mixed An array value will replace the value of $results - any other value will be ignored.

 */

	public function afterFind(Model $model, $results, $primary = false) {

	}

/**

 * beforeValidate is called before a model is validated, you can use this callback to

 * add behavior validation rules into a models validate array. Returning false

 * will allow you to make the validation fail.

 *

 * @param Model $model Model using this behavior

 * @param array $options Options passed from Model::save().

 * @return mixed False or null will abort the operation. Any other result will continue.

 * @see Model::save()

 */

	public function beforeValidate(Model $model, $options = array()) {

		return true;

	}

/**

 * afterValidate is called just after model data was validated, you can use this callback

 * to perform any data cleanup or preparation if needed

 *

 * @param Model $model Model using this behavior

 * @return mixed False will stop this event from being passed to other behaviors

 */

	public function afterValidate(Model $model) {

		return true;

	}

/**

 * beforeSave is called before a model is saved. Returning false from a beforeSave callback

 * will abort the save operation.

 *

 * @param Model $model Model using this behavior

 * @param array $options Options passed from Model::save().

 * @return mixed False if the operation should abort. Any other result will continue.

 * @see Model::save()

 */

	public function beforeSave(Model $model, $options = array()) {

		return true;

	}

/**

 * afterSave is called after a model is saved.

 *

 * @param Model $model Model using this behavior

 * @param bool $created True if this save created a new record

 * @param array $options Options passed from Model::save().

 * @return bool

 * @see Model::save()

 */

	public function afterSave(Model $model, $created, $options = array()) {

		return true;

	}

/**

 * Before delete is called before any delete occurs on the attached model, but after the model's

 * beforeDelete is called. Returning false from a beforeDelete will abort the delete.

 *

 * @param Model $model Model using this behavior

 * @param bool $cascade If true records that depend on this record will also be deleted

 * @return mixed False if the operation should abort. Any other result will continue.

 */

	public function beforeDelete(Model $model, $cascade = true) {

		return true;

	}

/**

 * After delete is called after any delete occurs on the attached model.

 *

 * @param Model $model Model using this behavior

 * @return void

 */

	public function afterDelete(Model $model) {

	}

/**

 * DataSource error callback

 *

 * @param Model $model Model using this behavior

 * @param string $error Error generated in DataSource

 * @return void

 */

	public function onError(Model $model, $error) {

	}

/**

 * 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 Model $model Model using this behavior

 * @param string $field Field to be added to $model's whitelist

 * @return void

 */

	protected function _addToWhitelist(Model $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;

		}

	}

}