forked from GNUsocial/gnu-social
354 lines
7.5 KiB
ReStructuredText
354 lines
7.5 KiB
ReStructuredText
Custom Annotation Classes
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=========================
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If you want to define your own annotations, you just have to group them
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in a namespace and register this namespace in the ``AnnotationRegistry``.
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Annotation classes have to contain a class-level docblock with the text
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``@Annotation``:
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.. code-block:: php
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namespace MyCompany\Annotations;
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/** @Annotation */
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class Bar
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{
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// some code
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}
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Inject annotation values
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------------------------
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The annotation parser checks if the annotation constructor has arguments,
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if so then it will pass the value array, otherwise it will try to inject
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values into public properties directly:
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.. code-block:: php
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namespace MyCompany\Annotations;
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/**
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* @Annotation
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*
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* Some Annotation using a constructor
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*/
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class Bar
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{
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private $foo;
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public function __construct(array $values)
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{
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$this->foo = $values['foo'];
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}
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}
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/**
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* @Annotation
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*
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* Some Annotation without a constructor
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*/
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class Foo
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{
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public $bar;
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}
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Annotation Target
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-----------------
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``@Target`` indicates the kinds of class elements to which an annotation
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type is applicable. Then you could define one or more targets:
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- ``CLASS`` Allowed in class docblocks
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- ``PROPERTY`` Allowed in property docblocks
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- ``METHOD`` Allowed in the method docblocks
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- ``ALL`` Allowed in class, property and method docblocks
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- ``ANNOTATION`` Allowed inside other annotations
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If the annotations is not allowed in the current context, an
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``AnnotationException`` is thrown.
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.. code-block:: php
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namespace MyCompany\Annotations;
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/**
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* @Annotation
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* @Target({"METHOD","PROPERTY"})
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*/
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class Bar
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{
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// some code
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}
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/**
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* @Annotation
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* @Target("CLASS")
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*/
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class Foo
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{
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// some code
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}
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Attribute types
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---------------
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The annotation parser checks the given parameters using the phpdoc
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annotation ``@var``, The data type could be validated using the ``@var``
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annotation on the annotation properties or using the ``@Attributes`` and
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``@Attribute`` annotations.
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If the data type does not match you get an ``AnnotationException``
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.. code-block:: php
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namespace MyCompany\Annotations;
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/**
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* @Annotation
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* @Target({"METHOD","PROPERTY"})
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*/
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class Bar
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{
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/** @var mixed */
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public $mixed;
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/** @var boolean */
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public $boolean;
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/** @var bool */
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public $bool;
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/** @var float */
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public $float;
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/** @var string */
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public $string;
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/** @var integer */
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public $integer;
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/** @var array */
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public $array;
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/** @var SomeAnnotationClass */
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public $annotation;
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/** @var array<integer> */
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public $arrayOfIntegers;
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/** @var array<SomeAnnotationClass> */
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public $arrayOfAnnotations;
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}
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/**
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* @Annotation
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* @Target({"METHOD","PROPERTY"})
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* @Attributes({
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* @Attribute("stringProperty", type = "string"),
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* @Attribute("annotProperty", type = "SomeAnnotationClass"),
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* })
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*/
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class Foo
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{
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public function __construct(array $values)
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{
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$this->stringProperty = $values['stringProperty'];
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$this->annotProperty = $values['annotProperty'];
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}
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// some code
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}
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Annotation Required
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-------------------
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``@Required`` indicates that the field must be specified when the
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annotation is used. If it is not used you get an ``AnnotationException``
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stating that this value can not be null.
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Declaring a required field:
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.. code-block:: php
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/**
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* @Annotation
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* @Target("ALL")
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*/
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class Foo
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{
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/** @Required */
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public $requiredField;
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}
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Usage:
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.. code-block:: php
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/** @Foo(requiredField="value") */
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public $direction; // Valid
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/** @Foo */
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public $direction; // Required field missing, throws an AnnotationException
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Enumerated values
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-----------------
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- An annotation property marked with ``@Enum`` is a field that accepts a
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fixed set of scalar values.
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- You should use ``@Enum`` fields any time you need to represent fixed
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values.
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- The annotation parser checks the given value and throws an
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``AnnotationException`` if the value does not match.
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Declaring an enumerated property:
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.. code-block:: php
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/**
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* @Annotation
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* @Target("ALL")
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*/
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class Direction
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{
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/**
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* @Enum({"NORTH", "SOUTH", "EAST", "WEST"})
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*/
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public $value;
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}
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Annotation usage:
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.. code-block:: php
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/** @Direction("NORTH") */
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public $direction; // Valid value
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/** @Direction("NORTHEAST") */
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public $direction; // Invalid value, throws an AnnotationException
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Constants
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---------
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The use of constants and class constants is available on the annotations
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parser.
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The following usages are allowed:
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.. code-block:: php
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namespace MyCompany\Entity;
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use MyCompany\Annotations\Foo;
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use MyCompany\Annotations\Bar;
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use MyCompany\Entity\SomeClass;
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/**
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* @Foo(PHP_EOL)
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* @Bar(Bar::FOO)
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* @Foo({SomeClass::FOO, SomeClass::BAR})
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* @Bar({SomeClass::FOO_KEY = SomeClass::BAR_VALUE})
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*/
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class User
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{
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}
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Be careful with constants and the cache !
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.. note::
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The cached reader will not re-evaluate each time an annotation is
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loaded from cache. When a constant is changed the cache must be
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cleaned.
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Usage
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-----
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Using the library API is simple. Using the annotations described in the
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previous section, you can now annotate other classes with your
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annotations:
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.. code-block:: php
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namespace MyCompany\Entity;
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use MyCompany\Annotations\Foo;
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use MyCompany\Annotations\Bar;
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/**
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* @Foo(bar="foo")
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* @Bar(foo="bar")
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*/
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class User
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{
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}
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Now we can write a script to get the annotations above:
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.. code-block:: php
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$reflClass = new ReflectionClass('MyCompany\Entity\User');
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$classAnnotations = $reader->getClassAnnotations($reflClass);
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foreach ($classAnnotations AS $annot) {
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if ($annot instanceof \MyCompany\Annotations\Foo) {
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echo $annot->bar; // prints "foo";
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} else if ($annot instanceof \MyCompany\Annotations\Bar) {
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echo $annot->foo; // prints "bar";
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}
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}
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You have a complete API for retrieving annotation class instances from a
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class, property or method docblock:
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Reader API
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~~~~~~~~~~
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Access all annotations of a class
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. code-block:: php
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public function getClassAnnotations(\ReflectionClass $class);
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Access one annotation of a class
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. code-block:: php
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public function getClassAnnotation(\ReflectionClass $class, $annotationName);
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Access all annotations of a method
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. code-block:: php
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public function getMethodAnnotations(\ReflectionMethod $method);
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Access one annotation of a method
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. code-block:: php
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public function getMethodAnnotation(\ReflectionMethod $method, $annotationName);
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Access all annotations of a property
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. code-block:: php
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public function getPropertyAnnotations(\ReflectionProperty $property);
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Access one annotation of a property
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. code-block:: php
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public function getPropertyAnnotation(\ReflectionProperty $property, $annotationName);
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