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  1: <?php
  2: /**
  3:  * Model behaviors base class.
  4:  *
  5:  * Adds methods and automagic functionality to Cake Models.
  6:  *
  7:  * PHP 5
  8:  *
  9:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 10:  * Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
 11:  *
 12:  * Licensed under The MIT License
 13:  * Redistributions of files must retain the above copyright notice.
 14:  *
 15:  * @copyright     Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
 16:  * @link          http://cakephp.org CakePHP(tm) Project
 17:  * @package       Cake.Model
 18:  * @since         CakePHP(tm) v 1.2.0.0
 19:  * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 20:  */
 21: 
 22: /**
 23:  * Model behavior base class.
 24:  *
 25:  * Defines the Behavior interface, and contains common model interaction functionality.  Behaviors
 26:  * allow you to simulate mixins, and create reusable blocks of application logic, that can be reused across
 27:  * several models.  Behaviors also provide a way to hook into model callbacks and augment their behavior.
 28:  *
 29:  * ### Mixin methods
 30:  *
 31:  * Behaviors can provide mixin like features by declaring public methods.  These methods should expect
 32:  * the model instance to be shifted onto the parameter list.
 33:  *
 34:  * {{{
 35:  * function doSomething(Model $model, $arg1, $arg2) {
 36:  *      //do something
 37:  * }
 38:  * }}}
 39:  *
 40:  * Would be called like `$this->Model->doSomething($arg1, $arg2);`.
 41:  *
 42:  * ### Mapped methods
 43:  *
 44:  * Behaviors can also define mapped methods.  Mapped methods use pattern matching for method invocation. This
 45:  * allows you to create methods similar to Model::findAllByXXX methods on your behaviors.  Mapped methods need to
 46:  * be declared in your behaviors `$mapMethods` array.  The method signature for a mapped method is slightly different
 47:  * than a normal behavior mixin method.
 48:  *
 49:  * {{{
 50:  * public $mapMethods = array('/do(\w+)/' => 'doSomething');
 51:  *
 52:  * function doSomething(Model $model, $method, $arg1, $arg2) {
 53:  *      //do something
 54:  * }
 55:  * }}}
 56:  *
 57:  * The above will map every doXXX() method call to the behavior.  As you can see, the model is
 58:  * still the first parameter, but the called method name will be the 2nd parameter.  This allows
 59:  * you to munge the method name for additional information, much like Model::findAllByXX.
 60:  *
 61:  * @package       Cake.Model
 62:  * @see Model::$actsAs
 63:  * @see BehaviorCollection::load()
 64:  */
 65: class ModelBehavior extends Object {
 66: 
 67: /**
 68:  * Contains configuration settings for use with individual model objects.  This
 69:  * is used because if multiple models use this Behavior, each will use the same
 70:  * object instance.  Individual model settings should be stored as an
 71:  * associative array, keyed off of the model name.
 72:  *
 73:  * @var array
 74:  * @see Model::$alias
 75:  */
 76:     public $settings = array();
 77: 
 78: /**
 79:  * Allows the mapping of preg-compatible regular expressions to public or
 80:  * private methods in this class, where the array key is a /-delimited regular
 81:  * expression, and the value is a class method.  Similar to the functionality of
 82:  * the findBy* / findAllBy* magic methods.
 83:  *
 84:  * @var array
 85:  */
 86:     public $mapMethods = array();
 87: 
 88: /**
 89:  * Setup this behavior with the specified configuration settings.
 90:  *
 91:  * @param Model $model Model using this behavior
 92:  * @param array $config Configuration settings for $model
 93:  * @return void
 94:  */
 95:     public function setup(Model $model, $config = array()) {
 96:     }
 97: 
 98: /**
 99:  * Clean up any initialization this behavior has done on a model.  Called when a behavior is dynamically
100:  * detached from a model using Model::detach().
101:  *
102:  * @param Model $model Model using this behavior
103:  * @return void
104:  * @see BehaviorCollection::detach()
105:  */
106:     public function cleanup(Model $model) {
107:         if (isset($this->settings[$model->alias])) {
108:             unset($this->settings[$model->alias]);
109:         }
110:     }
111: 
112: /**
113:  * beforeFind can be used to cancel find operations, or modify the query that will be executed.
114:  * By returning null/false you can abort a find.  By returning an array you can modify/replace the query
115:  * that is going to be run.
116:  *
117:  * @param Model $model Model using this behavior
118:  * @param array $query Data used to execute this query, i.e. conditions, order, etc.
119:  * @return boolean|array False or null will abort the operation. You can return an array to replace the
120:  *   $query that will be eventually run.
121:  */
122:     public function beforeFind(Model $model, $query) {
123:         return true;
124:     }
125: 
126: /**
127:  * After find callback. Can be used to modify any results returned by find.
128:  *
129:  * @param Model $model Model using this behavior
130:  * @param mixed $results The results of the find operation
131:  * @param boolean $primary Whether this model is being queried directly (vs. being queried as an association)
132:  * @return mixed An array value will replace the value of $results - any other value will be ignored.
133:  */
134:     public function afterFind(Model $model, $results, $primary) {
135:     }
136: 
137: /**
138:  * beforeValidate is called before a model is validated, you can use this callback to
139:  * add behavior validation rules into a models validate array.  Returning false
140:  * will allow you to make the validation fail.
141:  *
142:  * @param Model $model Model using this behavior
143:  * @return mixed False or null will abort the operation. Any other result will continue.
144:  */
145:     public function beforeValidate(Model $model) {
146:         return true;
147:     }
148: 
149: /**
150:  * afterValidate is called just after model data was validated, you can use this callback
151:  * to perform any data cleanup or preparation if needed
152:  *
153:  * @param Model $model Model using this behavior
154:  * @return mixed False will stop this event from being passed to other behaviors
155:  */
156:     public function afterValidate(Model $model) {
157:         return true;
158:     }
159: 
160: /**
161:  * beforeSave is called before a model is saved.  Returning false from a beforeSave callback
162:  * will abort the save operation.
163:  *
164:  * @param Model $model Model using this behavior
165:  * @return mixed False if the operation should abort. Any other result will continue.
166:  */
167:     public function beforeSave(Model $model) {
168:         return true;
169:     }
170: 
171: /**
172:  * afterSave is called after a model is saved.
173:  *
174:  * @param Model $model Model using this behavior
175:  * @param boolean $created True if this save created a new record
176:  * @return boolean
177:  */
178:     public function afterSave(Model $model, $created) {
179:         return true;
180:     }
181: 
182: /**
183:  * Before delete is called before any delete occurs on the attached model, but after the model's
184:  * beforeDelete is called.  Returning false from a beforeDelete will abort the delete.
185:  *
186:  * @param Model $model Model using this behavior
187:  * @param boolean $cascade If true records that depend on this record will also be deleted
188:  * @return mixed False if the operation should abort. Any other result will continue.
189:  */
190:     public function beforeDelete(Model $model, $cascade = true) {
191:         return true;
192:     }
193: 
194: /**
195:  * After delete is called after any delete occurs on the attached model.
196:  *
197:  * @param Model $model Model using this behavior
198:  * @return void
199:  */
200:     public function afterDelete(Model $model) {
201:     }
202: 
203: /**
204:  * DataSource error callback
205:  *
206:  * @param Model $model Model using this behavior
207:  * @param string $error Error generated in DataSource
208:  * @return void
209:  */
210:     public function onError(Model $model, $error) {
211:     }
212: 
213: /**
214:  * If $model's whitelist property is non-empty, $field will be added to it.
215:  * Note: this method should *only* be used in beforeValidate or beforeSave to ensure
216:  * that it only modifies the whitelist for the current save operation.  Also make sure
217:  * you explicitly set the value of the field which you are allowing.
218:  *
219:  * @param Model $model Model using this behavior
220:  * @param string $field Field to be added to $model's whitelist
221:  * @return void
222:  */
223:     protected function _addToWhitelist(Model $model, $field) {
224:         if (is_array($field)) {
225:             foreach ($field as $f) {
226:                 $this->_addToWhitelist($model, $f);
227:             }
228:             return;
229:         }
230:         if (!empty($model->whitelist) && !in_array($field, $model->whitelist)) {
231:             $model->whitelist[] = $field;
232:         }
233:     }
234: 
235: }
236: 
237: 
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