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author | Devian <devianleong@gmail.com> | 2021-04-22 17:03:46 +0800 |
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committer | Devian <devianleong@gmail.com> | 2021-04-22 17:03:46 +0800 |
commit | 745cf2431a71d0e6c5f08f8605839279b2f7496e (patch) | |
tree | 11e4c7a19ac9f9efc1bb253b29b1fa488c34238e /vendor/doctrine/annotations/docs/en/custom.rst |
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diff --git a/vendor/doctrine/annotations/docs/en/custom.rst b/vendor/doctrine/annotations/docs/en/custom.rst new file mode 100644 index 0000000..11fbe1a --- /dev/null +++ b/vendor/doctrine/annotations/docs/en/custom.rst @@ -0,0 +1,443 @@ +Custom Annotation Classes +========================= + +If you want to define your own annotations, you just have to group them +in a namespace and register this namespace in the ``AnnotationRegistry``. +Annotation classes have to contain a class-level docblock with the text +``@Annotation``: + +.. code-block:: php + + namespace MyCompany\Annotations; + + /** @Annotation */ + class Bar + { + // some code + } + +Inject annotation values +------------------------ + +The annotation parser checks if the annotation constructor has arguments, +if so then it will pass the value array, otherwise it will try to inject +values into public properties directly: + + +.. code-block:: php + + namespace MyCompany\Annotations; + + /** + * @Annotation + * + * Some Annotation using a constructor + */ + class Bar + { + private $foo; + + public function __construct(array $values) + { + $this->foo = $values['foo']; + } + } + + /** + * @Annotation + * + * Some Annotation without a constructor + */ + class Foo + { + public $bar; + } + +Optional: Constructors with Named Parameters +-------------------------------------------- + +Starting with Annotations v1.11 a new annotation instantiation strategy +is available that aims at compatibility of Annotation classes with the PHP 8 +attribute feature. You need to declare a constructor with regular parameter +names that match the named arguments in the annotation syntax. + +To enable this feature, you can tag your annotation class with +``@NamedArgumentConstructor`` (available from v1.12) or implement the +``Doctrine\Common\Annotations\NamedArgumentConstructorAnnotation`` interface +(available from v1.11 and deprecated as of v1.12). +When using the ``@NamedArgumentConstructor`` tag, the first argument of the +constructor is considered as the default one. + + +Usage with the ``@NamedArgumentContrustor`` tag + +.. code-block:: php + + namespace MyCompany\Annotations; + + /** + * @Annotation + * @NamedArgumentConstructor + */ + class Bar implements NamedArgumentConstructorAnnotation + { + private $foo; + + public function __construct(string $foo) + { + $this->foo = $foo; + } + } + + /** Usable with @Bar(foo="baz") */ + /** Usable with @Bar("baz") */ + +In combination with PHP 8's constructor property promotion feature +you can simplify this to: + +.. code-block:: php + + namespace MyCompany\Annotations; + + /** + * @Annotation + * @NamedArgumentConstructor + */ + class Bar implements NamedArgumentConstructorAnnotation + { + public function __construct(private string $foo) {} + } + + +Usage with the +``Doctrine\Common\Annotations\NamedArgumentConstructorAnnotation`` +interface (v1.11, deprecated as of v1.12): +.. code-block:: php + + namespace MyCompany\Annotations; + + use Doctrine\Common\Annotations\NamedArgumentConstructorAnnotation; + + /** @Annotation */ + class Bar implements NamedArgumentConstructorAnnotation + { + private $foo; + + public function __construct(private string $foo) {} + } + + /** Usable with @Bar(foo="baz") */ + +Annotation Target +----------------- + +``@Target`` indicates the kinds of class elements to which an annotation +type is applicable. Then you could define one or more targets: + +- ``CLASS`` Allowed in class docblocks +- ``PROPERTY`` Allowed in property docblocks +- ``METHOD`` Allowed in the method docblocks +- ``FUNCTION`` Allowed in function dockblocks +- ``ALL`` Allowed in class, property, method and function docblocks +- ``ANNOTATION`` Allowed inside other annotations + +If the annotations is not allowed in the current context, an +``AnnotationException`` is thrown. + +.. code-block:: php + + namespace MyCompany\Annotations; + + /** + * @Annotation + * @Target({"METHOD","PROPERTY"}) + */ + class Bar + { + // some code + } + + /** + * @Annotation + * @Target("CLASS") + */ + class Foo + { + // some code + } + +Attribute types +--------------- + +The annotation parser checks the given parameters using the phpdoc +annotation ``@var``, The data type could be validated using the ``@var`` +annotation on the annotation properties or using the ``@Attributes`` and +``@Attribute`` annotations. + +If the data type does not match you get an ``AnnotationException`` + +.. code-block:: php + + namespace MyCompany\Annotations; + + /** + * @Annotation + * @Target({"METHOD","PROPERTY"}) + */ + class Bar + { + /** @var mixed */ + public $mixed; + + /** @var boolean */ + public $boolean; + + /** @var bool */ + public $bool; + + /** @var float */ + public $float; + + /** @var string */ + public $string; + + /** @var integer */ + public $integer; + + /** @var array */ + public $array; + + /** @var SomeAnnotationClass */ + public $annotation; + + /** @var array<integer> */ + public $arrayOfIntegers; + + /** @var array<SomeAnnotationClass> */ + public $arrayOfAnnotations; + } + + /** + * @Annotation + * @Target({"METHOD","PROPERTY"}) + * @Attributes({ + * @Attribute("stringProperty", type = "string"), + * @Attribute("annotProperty", type = "SomeAnnotationClass"), + * }) + */ + class Foo + { + public function __construct(array $values) + { + $this->stringProperty = $values['stringProperty']; + $this->annotProperty = $values['annotProperty']; + } + + // some code + } + +Annotation Required +------------------- + +``@Required`` indicates that the field must be specified when the +annotation is used. If it is not used you get an ``AnnotationException`` +stating that this value can not be null. + +Declaring a required field: + +.. code-block:: php + + /** + * @Annotation + * @Target("ALL") + */ + class Foo + { + /** @Required */ + public $requiredField; + } + +Usage: + +.. code-block:: php + + /** @Foo(requiredField="value") */ + public $direction; // Valid + + /** @Foo */ + public $direction; // Required field missing, throws an AnnotationException + + +Enumerated values +----------------- + +- An annotation property marked with ``@Enum`` is a field that accepts a + fixed set of scalar values. +- You should use ``@Enum`` fields any time you need to represent fixed + values. +- The annotation parser checks the given value and throws an + ``AnnotationException`` if the value does not match. + + +Declaring an enumerated property: + +.. code-block:: php + + /** + * @Annotation + * @Target("ALL") + */ + class Direction + { + /** + * @Enum({"NORTH", "SOUTH", "EAST", "WEST"}) + */ + public $value; + } + +Annotation usage: + +.. code-block:: php + + /** @Direction("NORTH") */ + public $direction; // Valid value + + /** @Direction("NORTHEAST") */ + public $direction; // Invalid value, throws an AnnotationException + + +Constants +--------- + +The use of constants and class constants is available on the annotations +parser. + +The following usages are allowed: + +.. code-block:: php + + namespace MyCompany\Entity; + + use MyCompany\Annotations\Foo; + use MyCompany\Annotations\Bar; + use MyCompany\Entity\SomeClass; + + /** + * @Foo(PHP_EOL) + * @Bar(Bar::FOO) + * @Foo({SomeClass::FOO, SomeClass::BAR}) + * @Bar({SomeClass::FOO_KEY = SomeClass::BAR_VALUE}) + */ + class User + { + } + + +Be careful with constants and the cache ! + +.. note:: + + The cached reader will not re-evaluate each time an annotation is + loaded from cache. When a constant is changed the cache must be + cleaned. + + +Usage +----- + +Using the library API is simple. Using the annotations described in the +previous section, you can now annotate other classes with your +annotations: + +.. code-block:: php + + namespace MyCompany\Entity; + + use MyCompany\Annotations\Foo; + use MyCompany\Annotations\Bar; + + /** + * @Foo(bar="foo") + * @Bar(foo="bar") + */ + class User + { + } + +Now we can write a script to get the annotations above: + +.. code-block:: php + + $reflClass = new ReflectionClass('MyCompany\Entity\User'); + $classAnnotations = $reader->getClassAnnotations($reflClass); + + foreach ($classAnnotations AS $annot) { + if ($annot instanceof \MyCompany\Annotations\Foo) { + echo $annot->bar; // prints "foo"; + } else if ($annot instanceof \MyCompany\Annotations\Bar) { + echo $annot->foo; // prints "bar"; + } + } + +You have a complete API for retrieving annotation class instances from a +class, property or method docblock: + + +Reader API +~~~~~~~~~~ + +Access all annotations of a class +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: php + + public function getClassAnnotations(\ReflectionClass $class); + +Access one annotation of a class +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: php + + public function getClassAnnotation(\ReflectionClass $class, $annotationName); + +Access all annotations of a method +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: php + + public function getMethodAnnotations(\ReflectionMethod $method); + +Access one annotation of a method +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: php + + public function getMethodAnnotation(\ReflectionMethod $method, $annotationName); + +Access all annotations of a property +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: php + + public function getPropertyAnnotations(\ReflectionProperty $property); + +Access one annotation of a property +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: php + + public function getPropertyAnnotation(\ReflectionProperty $property, $annotationName); + +Access all annotations of a function +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: php + + public function getFunctionAnnotations(\ReflectionFunction $property); + +Access one annotation of a function +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: php + + public function getFunctionAnnotation(\ReflectionFunction $property, $annotationName); |