Re: Trying to use Component polymorphism, How do I load a component on the fly?
Aaaah. I still have a problem. I can't seem to use components in my
sub-classed component. For example, if I have the following:
class RedComponent extends ColorComponent
{
var $components = array('Session', 'Flickr');
...
}
I get the folloiwng error when I reference the component from
RedComponent, either as $this->Flickr, or $this->controller->Flickr.
Notice (8): Undefined property: RedComponent::$Flickr [APP
\controllers\components\red.php, line 30]
If I define the component in the ColorComponent class, then I can
reference it using $this->controller->Flickr, but NOT $this->Flickr.
what am I doing wrong???
On Apr 26, 7:06 pm, mixersoft <[EMAIL PROTECTED]> wrote:
> I think I have it worked out.
>
> The following example allows me to load sub-classed Components on the
> fly and use them as if they were a "parent class" instance. Note that
> components are loaded in the controller through this static command:
>
> ColorComponent::create($this, 'Red');
>
> and are referenced in the controller as: $this->Color
>
> There might be a more elegant way to do this, but it's good enough for
> now. I hope this is of help to others.
>
> m.
> ---
>
> // file: /app/controllers/components/color.php
>
> class ColorComponent extends Object
> {
> var $components = array('Session');
> var $controller;
> var $name='Color';
>
> function startup(& $controller) {
> $this->controller = $controller;
> $controller->Color = $this;
> // debug("Color startup, controller=".print_r($this->controller-
>
> >name, true));
>
> }
>
> static function create(& $controller, $color) {
> switch ($color) {
> case 'Red':
> App::import('Component','Red');
> $controller->Color = new RedComponent();
> break;
> case 'Blue':
> App::import('Component','Blue');
> $controller->Color = new BlueComponent();
> break;
> }
> $controller->Color->startup($controller);
> }
>
> function getColor() {
> return $this->controller->Session->read('Color');
> }
> function setColor() {
> debug("controller=".print_r($this->controller->name, true));
> $this->controller->Session->write('Color',$this->name);
> }
>
> }
>
> ?>
>
> // file: /app/controllers/components/red.php
>
> class RedComponent extends ColorComponent
> {
> var $components = array('Session');
> var $controller;
> var $name='Red';
> var $init;
>
> function startup(& $controller) {
> parent::startup($controller);
> $this->init = $this->name;
> }}
>
> ?>
>
>
> // file: /app/controllers/components/blue.php
>
> class BlueComponent extends ColorComponent
> {
> var $components = array('Session');
> var $controller;
> var $name='Blue';
>
> function startup(&$controller) {
> parent::startup($controller);
> $this->init = $this->name;
> }}
>
> ?>
>
> // file: /app/controllers/colors_controllers.php
>
> class ColorsController extends AppController {
> var $name = 'Colors';
> var $components = array('Color');
> var $uses = null;
> var $othAuthRestrictions = null;
>
> function testRed() {
> ColorComponent::create($this, 'Red');
> $this->Color->setColor();
> debug($this->Color->getColor());
> exit;
> }
>
> function testBlue() {
> ColorComponent::create($this, 'Blue');
> $this->Color->setColor();
> debug($this->Color->getColor());
> exit;
> }
>
> }
>
> ?>
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Re: Trying to use Component polymorphism, How do I load a component on the fly?
I think I have it worked out.
The following example allows me to load sub-classed Components on the
fly and use them as if they were a "parent class" instance. Note that
components are loaded in the controller through this static command:
ColorComponent::create($this, 'Red');
and are referenced in the controller as: $this->Color
There might be a more elegant way to do this, but it's good enough for
now. I hope this is of help to others.
m.
---
controller = $controller;
$controller->Color = $this;
// debug("Color startup, controller=".print_r($this->controller-
>name, true));
}
static function create(& $controller, $color) {
switch ($color) {
case 'Red':
App::import('Component','Red');
$controller->Color = new RedComponent();
break;
case 'Blue':
App::import('Component','Blue');
$controller->Color = new BlueComponent();
break;
}
$controller->Color->startup($controller);
}
function getColor() {
return $this->controller->Session->read('Color');
}
function setColor() {
debug("controller=".print_r($this->controller->name, true));
$this->controller->Session->write('Color',$this->name);
}
}
?>
init = $this->name;
}
}
?>
init = $this->name;
}
}
?>
Color->setColor();
debug($this->Color->getColor());
exit;
}
function testBlue() {
ColorComponent::create($this, 'Blue');
$this->Color->setColor();
debug($this->Color->getColor());
exit;
}
}
?>
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Re: Trying to use Component polymorphism, How do I load a component on the fly?
I'm trying to follow your suggestion, but with adjustment so that the
component instance is created in either a startup or beforeFilter
method, instead of calling new in every action that needs this
component.
I think I have it done properly, but now I get an error when the
Component tries to access it's own $components, in this case Session.
Here is what I have:
class ParentComponent extends Object {
var $components = array('Session');
static function create(& $controller, $type) {
switch ($type) {
case 'TypeA':
if (!($controller->Parent instanceof
TypeAComponent)) {
App::import('Component', 'TypeA');
$controller->Parent = new
TypeAComponent();
}
break;
case 'TypeB':
if (!($controller->Parent instanceof
TypeBComponent)) {
App::import('Component', 'TypeB');
$controller->Parent = new
TypeBComponent();
}
break;
}
$controller->Parent ->startup( $controller);
}
function startup(& $controller)
{
if (!empty($controller->type)) {
debug("ParentComponent - auto startup for
".$controller->type);
ParentComponent ::create($controller,
$controller->type);
} else {
// component reference
debug("ParentComponent - basic startup");
$controller->Parent = $this;
}
$this->controller = & $controller;
}
}
class TypeAComponent extends InterfaceComponent {
var $components = array('Session');
function startup() {
debug("TypeA startup");
}
}
class TypeBComponent extends InterfaceComponent {
var $components = array('Session');
function startup() {
debug("TypeB startup");
}
}
class MyController extends AppController {
var $components('Parent');
var $type;
function example() {
$this->type = 'TypeA';
ParentComponent::create($this, $this->type);
$result = $this->Session->read('Key');
}
}
and the output I get is:
ParentComponent - auto startup for TypeA
TypeAComponent constructor
TypeAComponent - startup
TypeAComponent -
startup<--- I
don't know why startup is called twice, but it shouldn't hurt
Notice (8): Undefined property: TypeAComponent::$Session <--- here
is the problem, I cannot access the Session Component, even though it
is declared
Fatal error: Call to a member function read() on a non-object
On Apr 23, 12:25 am, Joel Perras <[EMAIL PROTECTED]> wrote:
> App::import('Component', 'MyComponent') willloadthe component.
>
> In the Component::startup() you should have:
>
> public function startup(&$controller){
> $this->MyComponent = $controller->MyComponent;
>
> }
>
> so that you can then create a component instance when you need it:
>
> $this->MyComponentInstance = new MyComponent();
>
> -J.
>
> On Apr 22, 9:57 am, Anthony <[EMAIL PROTECTED]> wrote:
>
> > I'm trying to solve the same exact problem, so far unsuccessfully...
> > Any suggestions out there?
>
> > On Apr 20, 5:44 am, mixersoft <[EMAIL PROTECTED]> wrote:
>
> > > I have a "parent" component that I want to use to implement an
> > > "interface" (java style) and multple "child"componentsthat extend
> > > the "interface". I want my controllers to instantiate a specific
> > > "child" component, but in the code I want to reference all methods
> > > through the "parent" class or "inteface"
>
> > > class ParentComponent extends Object {}
>
> > > class TypeAComponent extends InterfaceComponent {
> > > function someMethod() { return "a";}
>
> > > }
>
> > > class TypeBComponent extends InterfaceComponent {
> > > function someMethod() { return 'b';}
>
> > > }
>
> > > class MyController extends AppController {
> > > var $components('TypeAComponent');
>
> > > function example() {
> > > $result = $this->Parent->someMethod();
> > > }
>
> > > }
>
> > > The example above works fine. But I cannot figure out how toload
> > > 'TypeAComponent' or 'TypeBComponent' dynamically. How can I set
> > > MyConfroller->componentsBEFORE the controller loads thecomponents?
> > > Or how do Iloadadditionalcomponentsafterwards?
>
> > > I tried this in ParentComponent, but while the subclassedcomponents
> > > constructors were called properly, thecomponentswere not "loaded"
> > > the same way (i.e. the child component's var $component array were not
> > > loaded, i.e. Session.)
>
> > > class ParentComponent extends Object {
> > > static funct
Re: Trying to use Component polymorphism, How do I load a component on the fly?
App::import('Component', 'MyComponent') will load the component.
In the Component::startup() you should have:
public function startup(&$controller){
$this->MyComponent = $controller->MyComponent;
}
so that you can then create a component instance when you need it:
$this->MyComponentInstance = new MyComponent();
-J.
On Apr 22, 9:57 am, Anthony <[EMAIL PROTECTED]> wrote:
> I'm trying to solve the same exact problem, so far unsuccessfully...
> Any suggestions out there?
>
> On Apr 20, 5:44 am, mixersoft <[EMAIL PROTECTED]> wrote:
>
> > I have a "parent" component that I want to use to implement an
> > "interface" (java style) and multple "child" components that extend
> > the "interface". I want my controllers to instantiate a specific
> > "child" component, but in the code I want to reference all methods
> > through the "parent" class or "inteface"
>
> > class ParentComponent extends Object {}
>
> > class TypeAComponent extends InterfaceComponent {
> > function someMethod() { return "a";}
>
> > }
>
> > class TypeBComponent extends InterfaceComponent {
> > function someMethod() { return 'b';}
>
> > }
>
> > class MyController extends AppController {
> > var $components('TypeAComponent');
>
> > function example() {
> > $result = $this->Parent->someMethod();
> > }
>
> > }
>
> > The example above works fine. But I cannot figure out how to load
> > 'TypeAComponent' or 'TypeBComponent' dynamically. How can I set
> > MyConfroller->components BEFORE the controller loads the components?
> > Or how do I load additional components afterwards?
>
> > I tried this in ParentComponent, but while the subclassed components
> > constructors were called properly, the components were not "loaded"
> > the same way (i.e. the child component's var $component array were not
> > loaded, i.e. Session.)
>
> > class ParentComponent extends Object {
> > static function create($type) {
> > switch ($type) {
> > case 'TypeA':
> >
> > include_once(dirname(__FILE__).DS.'typeA.php');
> > return new TypeAComponent();
> > break;
> > case 'TypeB':
> >
> > include_once(dirname(__FILE__).DS.'typeB.php');
> > return new TypeBComponent();
> > break;
> > }
> > }
>
> > }
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Re: Trying to use Component polymorphism, How do I load a component on the fly?
I'm trying to solve the same exact problem, so far unsuccessfully...
Any suggestions out there?
On Apr 20, 5:44 am, mixersoft <[EMAIL PROTECTED]> wrote:
> I have a "parent" component that I want to use to implement an
> "interface" (java style) and multple "child" components that extend
> the "interface". I want my controllers to instantiate a specific
> "child" component, but in the code I want to reference all methods
> through the "parent" class or "inteface"
>
> class ParentComponent extends Object {}
>
> class TypeAComponent extends InterfaceComponent {
> function someMethod() { return "a";}
>
> }
>
> class TypeBComponent extends InterfaceComponent {
> function someMethod() { return 'b';}
>
> }
>
> class MyController extends AppController {
> var $components('TypeAComponent');
>
> function example() {
> $result = $this->Parent->someMethod();
> }
>
> }
>
> The example above works fine. But I cannot figure out how to load
> 'TypeAComponent' or 'TypeBComponent' dynamically. How can I set
> MyConfroller->components BEFORE the controller loads the components?
> Or how do I load additional components afterwards?
>
> I tried this in ParentComponent, but while the subclassed components
> constructors were called properly, the components were not "loaded"
> the same way (i.e. the child component's var $component array were not
> loaded, i.e. Session.)
>
> class ParentComponent extends Object {
> static function create($type) {
> switch ($type) {
> case 'TypeA':
>
> include_once(dirname(__FILE__).DS.'typeA.php');
> return new TypeAComponent();
> break;
> case 'TypeB':
>
> include_once(dirname(__FILE__).DS.'typeB.php');
> return new TypeBComponent();
> break;
> }
> }
>
> }
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Trying to use Component polymorphism, How do I load a component on the fly?
I have a "parent" component that I want to use to implement an
"interface" (java style) and multple "child" components that extend
the "interface". I want my controllers to instantiate a specific
"child" component, but in the code I want to reference all methods
through the "parent" class or "inteface"
class ParentComponent extends Object {}
class TypeAComponent extends InterfaceComponent {
function someMethod() { return "a";}
}
class TypeBComponent extends InterfaceComponent {
function someMethod() { return 'b';}
}
class MyController extends AppController {
var $components('TypeAComponent');
function example() {
$result = $this->Parent->someMethod();
}
}
The example above works fine. But I cannot figure out how to load
'TypeAComponent' or 'TypeBComponent' dynamically. How can I set
MyConfroller->components BEFORE the controller loads the components?
Or how do I load additional components afterwards?
I tried this in ParentComponent, but while the subclassed components
constructors were called properly, the components were not "loaded"
the same way (i.e. the child component's var $component array were not
loaded, i.e. Session.)
class ParentComponent extends Object {
static function create($type) {
switch ($type) {
case 'TypeA':
include_once(dirname(__FILE__).DS.'typeA.php');
return new TypeAComponent();
break;
case 'TypeB':
include_once(dirname(__FILE__).DS.'typeB.php');
return new TypeBComponent();
break;
}
}
}
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