Deprecating BehaviorCollection::attach() and BehaviorCollection::detach(). load() and unload() are more generic and make sense in other contexts.

Adding base trigger implementation.
Adding tests for helper triggering.

cake/libs/model/model_behavior.php

@@ -239,6 +239,7 @@ class BehaviorCollection extends ObjectCollection {
 /**
  * Attaches a model object and loads a list of behaviors
  *
+ * @todo Make this method a constructor instead..
  * @access public
  * @return void
  */
@@ -253,13 +254,23 @@ class BehaviorCollection extends ObjectCollection {
 	}
 
 /**
- * Attaches a behavior to a model
+ * Backwards compatible alias for load()
+ *
+ * @return void
+ * @deprecated Replaced with load()
+ */
+	public function attach($behavior, $config = array()) {
+		return $this->load($behavior, $config);
+	}
+
+/**
+ * Loads a behavior into the collection.
  *
  * @param string $behavior CamelCased name of the behavior to load
  * @param array $config Behavior configuration parameters
  * @return boolean True on success, false on failure
  */
-	public function attach($behavior, $config = array()) {
+	public function load($behavior, $config = array()) {
 		list($plugin, $name) = pluginSplit($behavior);
 		$class = $name . 'Behavior';
 
@@ -343,7 +354,7 @@ class BehaviorCollection extends ObjectCollection {
  * @param string $name CamelCased name of the behavior to unload
  * @return void
  */
-	public function detach($name) {
+	public function unload($name) {
 		list($plugin, $name) = pluginSplit($name);
 		if (isset($this->{$name})) {
 			$this->{$name}->cleanup(ClassRegistry::getObject($this->modelName));
@@ -357,6 +368,17 @@ class BehaviorCollection extends ObjectCollection {
 		$this->_attached = array_values(array_diff($this->_attached, (array)$name));
 	}
 
+/**
+ * Backwards compatible alias for unload()
+ *
+ * @param string $name Name of behavior
+ * @return void
+ * @deprecated Use unload instead.
+ */
+	public function detach($name) {
+		return $this->unload($name);
+	}
+
 /**
  * Dispatches a behavior method
  *

cake/libs/object_collection.php

@@ -35,6 +35,66 @@ abstract class ObjectCollection {
  */
 	protected $_disabled = array();
 
+/**
+ * Loads a new object onto the collection. Can throw a variety of exceptions
+ *
+ * @param string $name Name of object to load.
+ * @param array $options Array of configuration options for the object to be constructed.
+ * @return object the constructed object
+ */
+	abstract public function load($name, $options = array());
+
+/**
+ * Unloads/deletes an object from the collection.
+ *
+ * @param string $name Name of the object to delete.
+ * @return void
+ */
+	abstract public function unload($name);
+
+/**
+ * Trigger a callback method on every object in the collection.
+ * Used to trigger methods on objects in the collection.  Will fire the methods in the 
+ * order they were attached.
+ *
+ * 
+ * @param string $callback Method to fire on all the objects. Its assumed all the objects implement
+ *   the method you are calling.
+ * @param array $params Array of parameters for the triggered callback.
+ * @param array $options Array of options.
+ * @return mixed Either true or $params[0] if $options['modParams'] is true.
+ */
+	public function trigger($callback, $params = array(), $options = array()) {
+		if (empty($this->_attached)) {
+			return true;
+		}
+		$options = array_merge(
+			array('break' => false, 'breakOn' => array(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;
+			}
+			$result = call_user_func_array(array($this->{$name}, $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;
+	}
+
 /**
  * Enables callbacks on a behavior or array of behaviors
  *

cake/libs/view/helper_collection.php

@@ -35,6 +35,7 @@ class HelperCollection extends ObjectCollection {
 	public function __construct(View $view) {
 		$this->_View = $view;
 	}
+
 /**
  * Loads/constructs a helper.  Will return the instance in the registry if it already exists.
  * 
@@ -65,6 +66,17 @@ class HelperCollection extends ObjectCollection {
 		return $this->{$name};
 	}
 
+/**
+ * Name of the helper to remove from the collection
+ *
+ * @param string $name Name of helper to delete.
+ * @return void
+ */
+	public function unload($name) {
+		list($plugin, $name) = pluginSplit($name);
+		unset($this->{$name});
+		$this->_attached = array_values(array_diff($this->_attached, (array)$name));
+	}
 
 }
 /**

cake/tests/cases/libs/view/helper_collection.test.php

@@ -82,4 +82,65 @@ class HelperCollectionTest extends CakeTestCase {
 
 		App::build();
 	}
+
+/**
+ * test unload()
+ *
+ * @return void
+ */
+	function testUnload() {
+		$this->Helpers->load('Form');
+		$this->Helpers->load('Html');
+
+		$result = $this->Helpers->attached();
+		$this->assertEquals(array('Form', 'Html'), $result, 'loaded helpers is wrong');
+
+		$this->Helpers->unload('Html');
+		$this->assertFalse(isset($this->Helpers->Html));
+		$this->assertTrue(isset($this->Helpers->Form));
+
+		$result = $this->Helpers->attached();
+		$this->assertEquals(array('Form'), $result, 'loaded helpers is wrong');
+	}
+
+/**
+ * test triggering callbacks.
+ *
+ * @return void
+ */
+	function testTrigger() {
+		$this->Helpers->load('Form');
+		$this->Helpers->load('Html');
+
+		$this->Helpers->Html = $this->getMock('HtmlHelper');
+		$this->Helpers->Form = $this->getMock('FormHelper');
+
+		$this->Helpers->Html->expects($this->once())->method('beforeRender')
+			->with('one', 'two');
+		$this->Helpers->Form->expects($this->once())->method('beforeRender')
+			->with('one', 'two');
+
+		$this->Helpers->trigger('beforeRender', array('one', 'two'));
+	}
+
+/**
+ * test trigger and disabled helpers.
+ *
+ * @return void
+ */
+	function testTriggerWithDisabledHelpers() {
+		$this->Helpers->load('Form');
+		$this->Helpers->load('Html');
+
+		$this->Helpers->Html = $this->getMock('HtmlHelper');
+		$this->Helpers->Form = $this->getMock('FormHelper');
+
+		$this->Helpers->Html->expects($this->once())->method('beforeRender')
+			->with('one', 'two');
+		$this->Helpers->Form->expects($this->never())->method('beforeRender');
+
+		$this->Helpers->disable('Form');
+
+		$this->Helpers->trigger('beforeRender', array('one', 'two'));
+	}
 }