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API CHANGE Deprecated Object->extInstance(), use getExtensionInstance() instead

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ENHANCEMENT Added Object->getExtensionInstances()
ENHANCEMENT Added Object::get_extensions()
ENHANCEMENT Unsetting class caches when using Object::add_extension() to avoid problems with defineMethods etc.
BUGFIX Fixed extension comparison with case sensitivity and stripping arguments in Object::has_extension()
BUGFIX Unsetting all cached singletons in Object::remove_extension() to avoid outdated extension_instances
MINOR Documentation in Object

git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@73900 467b73ca-7a2a-4603-9d3b-597d59a354a9
This commit is contained in:
Ingo Schommer 2009-03-31 22:27:53 +00:00
parent 2e109a27a5
commit 9f0be3eb7b
2 changed files with 274 additions and 38 deletions
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173
core/Object.php
View File

@ -1,9 +1,15 @@
<?php
/**
* A base class for all sapphire objects to inherit from
* A base class for all sapphire objects to inherit from.
*
* This class provides a number of pattern implementations, as well as methods and fixes to add extra psuedo-static
* and method functionality to PHP
* and method functionality to PHP.
*
* See {@link Extension} on how to implement a custom multiple
* inheritance for object instances based on PHP5 method call overloading.
*
* @todo Create instance-specific removeExtension() which removes an extension from $extension_instances,
* but not from static $extensions, and clears everything added through defineMethods(), mainly $extra_methods.
*
* @package sapphire
* @subpackage core
@ -11,8 +17,9 @@
abstract class Object {
/**
* An array of extension names and parameters to be applied to this object upon construction. For example:
* An array of extension names and parameters to be applied to this object upon construction.
*
* Example:
* <code>
* public static $extensions = array (
* 'Hierachy',
@ -20,12 +27,15 @@ abstract class Object {
* );
* </code>
*
* @var array
* Use {@link Object::add_extension()} to add extensions without access to the class code,
* e.g. to extend core classes.
*
* Extensions are instanciated together with the object and stored in {@link $extension_instances}.
*
* @var array $extensions
*/
public static $extensions = null;
// -----------------------------------------------------------------------------------------------------------------
/**#@+
* @var array
*/
@ -47,20 +57,16 @@ abstract class Object {
/**#@-*/
// -----------------------------------------------------------------------------------------------------------------
/**
* @var string the class name
*/
public $class;
/**
* @var array all current extension instances
* @var array all current extension instances.
*/
protected $extension_instances = array();
// -----------------------------------------------------------------------------------------------------------------
/**
* An implementation of the factory method, allows you to create an instance of a class
*
@ -230,7 +236,9 @@ abstract class Object {
}
/**
* Get an uninherited static variable - a variable that is explicity set in this class, and not in the parent class
* Get an uninherited static variable - a variable that is explicity set in this class, and not in the parent class.
*
* @todo Recursively filter out parent statics, currently only inspects the parent class
*
* @param string $class
* @param string $name
@ -295,7 +303,14 @@ abstract class Object {
/**
* Add a static variable without replacing it completely if possible, but merging in with both existing PHP statics
* and existing psuedo-statics
* and existing psuedo-statics. Uses PHP's array_merge_recursive() with if the $replace argument is FALSE.
*
* Documentation from http://php.net/array_merge_recursive:
* If the input arrays have the same string keys, then the values for these keys are merged together
* into an array, and this is done recursively, so that if one of the values is an array itself,
* the function will merge it with a corresponding entry in another array too.
* If, however, the arrays have the same numeric key, the later value will not overwrite the original value,
* but will be appended.
*
* @param string $class
* @param string $name the static name
@ -321,44 +336,105 @@ abstract class Object {
* Return TRUE if a class has a specified extension
*
* @param string $class
* @param string $requiredExtension the class name of the extension to check for
* @param string $requiredExtension the class name of the extension to check for.
*/
public static function has_extension($class, $requiredExtension) {
$requiredExtension = strtolower($requiredExtension);
if($extensions = self::get_static($class, 'extensions')) foreach($extensions as $extension) {
if(($p = strpos($extension, '(')) !== false) $extension = substr($extension, 0, $p);
if(strtolower($extension) == $requiredExtension) return true;
$left = strtolower(Extension::get_classname_without_arguments($extension));
$right = strtolower(Extension::get_classname_without_arguments($requiredExtension));
if($left == $right) return true;
}
return false;
}
/**
* Add an extension to a specific class
* Add an extension to a specific class.
* As an alternative, extensions can be added to a specific class
* directly in the {@link Object::$extensions} array.
* See {@link SiteTree::$extensions} for examples.
* Keep in mind that the extension will only be applied to new
* instances, not existing ones (including all instances created through {@link singleton()}).
*
* @param string $class
* @param string $extension the extension to add to the class
* @param string $class Class that should be decorated - has to be a subclass of {@link Object}
* @param string $extension Subclass of {@link Extension} with optional parameters
* as a string, e.g. "Versioned" or "Translatable('Param')"
*/
public static function add_extension($class, $extension) {
if(!preg_match('/([^(]*)/', $extension, $matches)) {
return false;
}
$extensionClass = $matches[1];
if(!class_exists($extensionClass)) {
user_error(sprintf('Object::add_extension() - Can\'t find extension class for "%s"', $extensionClass), E_USER_ERROR);
}
if(!is_subclass_of($extensionClass, 'Extension')) {
user_error(sprintf('Object::add_extension() - Extension "%s" is not a subclass of Extension', $extensionClass), E_USER_ERROR);
}
// unset some caches
self::$cached_statics[$class]['extensions'] = null;
$subclasses = ClassInfo::subclassesFor($class);
$subclasses[] = $class;
if($subclasses) foreach($subclasses as $subclass) {
unset(self::$classes_constructed[$subclass]);
}
// merge with existing static vars
self::add_static_var($class, 'extensions', array($extension));
}
/**
* Remove an extension from a class
* Remove an extension from a class.
* Keep in mind that this won't revert any datamodel additions
* of the extension at runtime, unless its used before the
* schema building kicks in (in your _config.php).
* Doesn't remove the extension from any {@link Object}
* instances which are already created, but will have an
* effect on new extensions.
* Clears any previously created singletons through {@link singleton()}
* to avoid side-effects from stale extension information.
*
* @todo Add support for removing extensions with parameters
*
* @param string $class
* @param string $extension
* @param string $extension Classname of an {@link Extension} subclass, without parameters
*/
public static function remove_extension($class, $extension) {
if(self::has_extension($class, $extension)) {
self::set_static (
self::set_static(
$class,
'extensions',
array_diff(self::get_static($class, 'extensions'), array($extension))
);
}
// unset singletons to avoid side-effects
global $_SINGLETONS;
$_SINGLETONS = array();
}
/**
* @param string $class
* @param bool $includeArgumentString Include the argument string in the return array,
* FALSE would return array("Versioned"), TRUE returns array("Versioned('Stage','Live')").
* @return array Numeric array of either {@link DataObjectDecorator} classnames,
* or eval'ed classname strings with constructor arguments.
*/
function get_extensions($class, $includeArgumentString = false) {
$extensions = self::get_static($class, 'extensions');
if($includeArgumentString) {
return $extensions;
} else {
$extensionClassnames = array();
if($extensions) foreach($extensions as $extension) {
$extensionClassnames[] = Extension::get_classname_without_arguments($extension);
}
return $extensionClassnames;
}
}
// -----------------------------------------------------------------------------------------------------------------
@ -368,6 +444,8 @@ abstract class Object {
if($extensionClasses = ClassInfo::ancestry($this->class)) foreach($extensionClasses as $class) {
if($extensions = self::uninherited_static($class, 'extensions')) foreach($extensions as $extension) {
// an $extension value can contain parameters as a string,
// e.g. "Versioned('Stage','Live')"
$instance = eval("return new $extension;");
$instance->setOwner($this);
$this->extension_instances[$instance->class] = $instance;
@ -471,6 +549,13 @@ abstract class Object {
self::$built_in_methods['_set'][$this->class] = true;
}
/**
* Adds any methods from {@link Extension} instances attached to this object.
* All these methods can then be called directly on the instance (transparently
* mapped through {@link __call()}), or called explicitly through {@link extend()}.
*
* @uses addMethodsFrom()
*/
protected function defineMethods() {
if($this->extension_instances) foreach(array_keys($this->extension_instances) as $key) {
$this->addMethodsFrom('extension_instances', $key);
@ -488,7 +573,7 @@ abstract class Object {
}
/**
* Add all the methods from an object property (which is an {@link Extension}) to this object
* Add all the methods from an object property (which is an {@link Extension}) to this object.
*
* @param string $property the property name
* @param string|int $index an index to use if the property is an array
@ -634,7 +719,9 @@ abstract class Object {
* Currently returns an array, with an index resulting every time the function is called. Only adds returns if
* they're not NULL, to avoid bogus results from methods just defined on the parent decorator. This is important for
* permission-checks through extend, as they use min() to determine if any of the returns is FALSE. As min() doesn't
* do type checking, an included NULL return would fail the permission checks
* do type checking, an included NULL return would fail the permission checks.
*
* The extension methods are defined during {@link __construct()} in {@link defineMethods()}.
*
* @param string $method the name of the method to call on each extension
* @param mixed $a1,... up to 7 arguments to be passed to the method
@ -654,25 +741,46 @@ abstract class Object {
}
/**
* Get an extension instance attached to this object by name
* Get an extension instance attached to this object by name.
*
* @uses hasExtension()
*
* @param string $extension
* @return Extension
*/
public function extInstance($extension) {
public function getExtensionInstance($extension) {
if($this->hasExtension($extension)) return $this->extension_instances[$extension];
}
/**
* Returns TRUE if this object has a specific extension applied
* Returns TRUE if this object instance has a specific extension applied
* in {@link $extension_instances}. Extension instances are initialized
* at constructor time, meaning if you use {@link add_extension()}
* afterwards, the added extension will just be added to new instances
* of the decorated class. Use the static method {@link has_extension()}
* to check if a class (not an instance) has a specific extension.
* Caution: Don't use singleton(<class>)->hasExtension() as it will
* give you inconsistent results based on when the singleton was first
* accessed.
*
* @param string $extension
* @param string $extension Classname of an {@link Extension} subclass without parameters
* @return bool
*/
public function hasExtension($extension) {
return isset($this->extension_instances[$extension]);
}
/**
* Get all extension instances for this specific object instance.
* See {@link get_extensions()} to get all applied extension classes
* for this class (not the instance).
*
* @return array Map of {@link DataObjectDecorator} instances, keyed by classname.
*/
public function getExtensionInstances() {
return $this->extension_instances;
}
// -----------------------------------------------------------------------------------------------------------------
/**
@ -769,4 +877,11 @@ abstract class Object {
return str_replace(array('~', '.', '/', '!', ' ', "\n", "\r", "\t", '\\', ':', '"', '\'', ';'), '_', $name);
}
/**
* @deprecated 2.4 Use getExtensionInstance
*/
public function extInstance($extension) {
return $this->getExtensionInstance($extension);
}
}

135
tests/ObjectTest.php
View File

@ -164,16 +164,125 @@ class ObjectTest extends SapphireTest {
$this->assertTrue($obj3_2->is_a('ObjectTest_CreateTest3'));
}
public function testGetExtensions() {
$this->assertEquals(
Object::get_extensions('ObjectTest_ExtensionTest'),
array(
'oBjEcTTEST_ExtendTest1',
"ObjectTest_ExtendTest2",
)
);
$this->assertEquals(
Object::get_extensions('ObjectTest_ExtensionTest', true),
array(
'oBjEcTTEST_ExtendTest1',
"ObjectTest_ExtendTest2('FOO', 'BAR')",
)
);
$inst = new ObjectTest_ExtensionTest();
$extensions = $inst->getExtensionInstances();
$this->assertEquals(count($extensions), 2);
$this->assertType(
'ObjectTest_ExtendTest1',
$extensions['ObjectTest_ExtendTest1']
);
$this->assertType(
'ObjectTest_ExtendTest2',
$extensions['ObjectTest_ExtendTest2']
);
$this->assertType(
'ObjectTest_ExtendTest1',
$inst->getExtensionInstance('ObjectTest_ExtendTest1')
);
$this->assertType(
'ObjectTest_ExtendTest2',
$inst->getExtensionInstance('ObjectTest_ExtendTest2')
);
}
/**
* Tests {@link Object::has_extension()}, {@link Object::add_extension()}
*/
public function testHasAndAddExtension() {
$this->assertTrue(Object::has_extension('ObjectTest_ExtensionTest', 'HIERACHY'));
$this->assertTrue(Object::has_extension('ObjectTest_ExtensionTest', 'translatable'));
$this->assertFalse(Object::has_extension('ObjectTest_ExtensionTest', 'Versioned'));
// ObjectTest_ExtendTest1 is built in via $extensions
$this->assertTrue(
Object::has_extension('ObjectTest_ExtensionTest', 'OBJECTTEST_ExtendTest1'),
"Extensions are detected when set on Object::\$extensions on has_extension() without case-sensitivity"
);
$this->assertTrue(
Object::has_extension('ObjectTest_ExtensionTest', 'ObjectTest_ExtendTest1'),
"Extensions are detected when set on Object::\$extensions on has_extension() without case-sensitivity"
);
$this->assertTrue(
singleton('ObjectTest_ExtensionTest')->hasExtension('ObjectTest_ExtendTest1'),
"Extensions are detected when set on Object::\$extensions on instance hasExtension() without case-sensitivity"
);
Object::add_extension('ObjectTest_ExtensionTest', 'VERSIONED("Stage", "Live")');
$this->assertTrue(Object::has_extension('ObjectTest_ExtensionTest', 'Versioned'));
// ObjectTest_ExtendTest2 is built in via $extensions (with parameters)
$this->assertTrue(
Object::has_extension('ObjectTest_ExtensionTest', 'ObjectTest_ExtendTest2'),
"Extensions are detected with static has_extension() when set on Object::\$extensions with additional parameters"
);
$this->assertTrue(
singleton('ObjectTest_ExtensionTest')->hasExtension('ObjectTest_ExtendTest2'),
"Extensions are detected with instance hasExtension() when set on Object::\$extensions with additional parameters"
);
$this->assertFalse(
Object::has_extension('ObjectTest_ExtensionTest', 'ObjectTest_ExtendTest3'),
"Other extensions available in the system are not present unless explicitly added to this object when checking through has_extension()"
);
$this->assertFalse(
singleton('ObjectTest_ExtensionTest')->hasExtension('ObjectTest_ExtendTest3'),
"Other extensions available in the system are not present unless explicitly added to this object when checking through instance hasExtension()"
);
// ObjectTest_ExtendTest3 is added manually
Object::add_extension('ObjectTest_ExtensionTest', 'ObjectTest_ExtendTest3("Param")');
$this->assertTrue(
Object::has_extension('ObjectTest_ExtensionTest', 'ObjectTest_ExtendTest3'),
"Extensions are detected with static has_extension() when added through add_extension()"
);
// a singleton() wouldn't work as its already initialized
$objectTest_ExtensionTest = new ObjectTest_ExtensionTest();
$this->assertTrue(
$objectTest_ExtensionTest->hasExtension('ObjectTest_ExtendTest3'),
"Extensions are detected with instance hasExtension() when added through add_extension()"
);
// @todo At the moment, this does NOT remove the extension due to parameterized naming,
// meaning the extension will remain added in further test cases
Object::remove_extension('ObjectTest_ExtensionTest', 'ObjectTest_ExtendTest3');
}
public function testRemoveExtension() {
// manually add ObjectTest_ExtendTest2
Object::add_extension('ObjectTest_ExtensionRemoveTest', 'ObjectTest_ExtendTest2');
$this->assertTrue(
Object::has_extension('ObjectTest_ExtensionRemoveTest', 'ObjectTest_ExtendTest2'),
"Extension added through \$add_extension() are added correctly"
);
Object::remove_extension('ObjectTest_ExtensionRemoveTest', 'ObjectTest_ExtendTest2');
$this->assertFalse(
Object::has_extension('ObjectTest_ExtensionRemoveTest', 'ObjectTest_ExtendTest2'),
"Extension added through \$add_extension() are detected as removed in has_extension()"
);
$this->assertFalse(
singleton('ObjectTest_ExtensionRemoveTest')->hasExtension('ObjectTest_ExtendTest2'),
"Extensions added through \$add_extension() are detected as removed in instances through hasExtension()"
);
// ObjectTest_ExtendTest1 is already present in $extensions
Object::remove_extension('ObjectTest_ExtensionRemoveTest', 'ObjectTest_ExtendTest1');
$this->assertFalse(
Object::has_extension('ObjectTest_ExtensionRemoveTest', 'ObjectTest_ExtendTest1'),
"Extension added through \$extensions are detected as removed in has_extension()"
);
$objectTest_ExtensionRemoveTest = new ObjectTest_ExtensionRemoveTest();
$this->assertFalse(
$objectTest_ExtensionRemoveTest->hasExtension('ObjectTest_ExtendTest1'),
"Extensions added through \$extensions are detected as removed in instances through hasExtension()"
);
}
public function testParentClass() {
@ -321,8 +430,8 @@ class ObjectTest_CreateTest3 extends Object {}
class ObjectTest_ExtensionTest extends Object {
public static $extensions = array (
'HiErAcHy',
"TrAnSlAtAbLe('FOO', 'BAR')",
'oBjEcTTEST_ExtendTest1',
"ObjectTest_ExtendTest2('FOO', 'BAR')",
);
}
@ -331,6 +440,14 @@ class ObjectTest_ExtensionTest2 extends Object {
public static $extensions = array('ObjectTest_Extension');
}
class ObjectTest_ExtensionRemoveTest extends Object {
public static $extensions = array (
'ObjectTest_ExtendTest1',
);
}
class ObjectTest_Extension extends Extension {}
class ObjectTest_CacheTest extends Object {
@ -364,4 +481,8 @@ class ObjectTest_ExtendTest2 extends Extension {
public function extendableMethod($argument = null) { return "ExtendTest2($argument)"; }
}
class ObjectTest_ExtendTest3 extends Extension {
public function extendableMethod($argument = null) { return "ExtendTest3($argument)"; }
}
/**#@-*/