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289 lines
10 KiB
PHP
289 lines
10 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\base;
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use Yii;
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/**
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* Object is the base class that implements the *property* feature.
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*
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* A property is defined by a getter method (e.g. `getLabel`), and/or a setter method (e.g. `setLabel`). For example,
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* the following getter and setter methods define a property named `label`:
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*
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* ~~~
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* private $_label;
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*
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* public function getLabel()
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* {
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* return $this->_label;
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* }
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*
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* public function setLabel($value)
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* {
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* $this->_label = $value;
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* }
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* ~~~
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*
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* Property names are *case-insensitive*.
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*
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* A property can be accessed like a member variable of an object. Reading or writing a property will cause the invocation
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* of the corresponding getter or setter method. For example,
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*
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* ~~~
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* // equivalent to $label = $object->getLabel();
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* $label = $object->label;
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* // equivalent to $object->setLabel('abc');
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* $object->label = 'abc';
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* ~~~
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*
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* If a property has only a getter method and has no setter method, it is considered as *read-only*. In this case, trying
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* to modify the property value will cause an exception.
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*
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* One can call [[hasProperty()]], [[canGetProperty()]] and/or [[canSetProperty()]] to check the existence of a property.
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*
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* Besides the property feature, Object also introduces an important object initialization life cycle. In particular,
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* creating an new instance of Object or its derived class will involve the following life cycles sequentially:
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*
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* 1. the class constructor is invoked;
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* 2. object properties are initialized according to the given configuration;
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* 3. the `init()` method is invoked.
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*
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* In the above, both Step 2 and 3 occur at the end of the class constructor. It is recommended that
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* you perform object initialization in the `init()` method because at that stage, the object configuration
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* is already applied.
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*
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* In order to ensure the above life cycles, if a child class of Object needs to override the constructor,
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* it should be done like the following:
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*
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* ~~~
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* public function __construct($param1, $param2, ..., $config = [])
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* {
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* ...
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* parent::__construct($config);
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* }
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* ~~~
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*
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* That is, a `$config` parameter (defaults to `[]`) should be declared as the last parameter
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* of the constructor, and the parent implementation should be called at the end of the constructor.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class Object
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{
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/**
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* Returns the fully qualified name of this class.
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* @return string the fully qualified name of this class.
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*/
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public static function className()
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{
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return get_called_class();
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}
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/**
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* Constructor.
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* The default implementation does two things:
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*
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* - Initializes the object with the given configuration `$config`.
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* - Call [[init()]].
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*
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* If this method is overridden in a child class, it is recommended that
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*
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* - the last parameter of the constructor is a configuration array, like `$config` here.
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* - call the parent implementation at the end of the constructor.
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*
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* @param array $config name-value pairs that will be used to initialize the object properties
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*/
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public function __construct($config = [])
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{
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if (!empty($config)) {
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Yii::configure($this, $config);
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}
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$this->init();
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}
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/**
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* Initializes the object.
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* This method is invoked at the end of the constructor after the object is initialized with the
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* given configuration.
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*/
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public function init()
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{
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}
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/**
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* Returns the value of an object property.
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*
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* Do not call this method directly as it is a PHP magic method that
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* will be implicitly called when executing `$value = $object->property;`.
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* @param string $name the property name
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* @return mixed the property value
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* @throws UnknownPropertyException if the property is not defined
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* @throws InvalidCallException if the property is write-only
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* @see __set()
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*/
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public function __get($name)
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{
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$getter = 'get' . $name;
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if (method_exists($this, $getter)) {
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return $this->$getter();
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} elseif (method_exists($this, 'set' . $name)) {
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throw new InvalidCallException('Getting write-only property: ' . get_class($this) . '::' . $name);
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} else {
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throw new UnknownPropertyException('Getting unknown property: ' . get_class($this) . '::' . $name);
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}
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}
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/**
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* Sets value of an object property.
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*
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* Do not call this method directly as it is a PHP magic method that
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* will be implicitly called when executing `$object->property = $value;`.
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* @param string $name the property name or the event name
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* @param mixed $value the property value
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* @throws UnknownPropertyException if the property is not defined
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* @throws InvalidCallException if the property is read-only
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* @see __get()
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*/
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public function __set($name, $value)
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{
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$setter = 'set' . $name;
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if (method_exists($this, $setter)) {
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$this->$setter($value);
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} elseif (method_exists($this, 'get' . $name)) {
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throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
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} else {
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throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
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}
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}
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/**
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* Checks if the named property is set (not null).
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*
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* Do not call this method directly as it is a PHP magic method that
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* will be implicitly called when executing `isset($object->property)`.
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*
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* Note that if the property is not defined, false will be returned.
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* @param string $name the property name or the event name
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* @return boolean whether the named property is set (not null).
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*/
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public function __isset($name)
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{
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$getter = 'get' . $name;
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if (method_exists($this, $getter)) {
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return $this->$getter() !== null;
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} else {
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return false;
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}
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}
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/**
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* Sets an object property to null.
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*
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* Do not call this method directly as it is a PHP magic method that
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* will be implicitly called when executing `unset($object->property)`.
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*
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* Note that if the property is not defined, this method will do nothing.
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* If the property is read-only, it will throw an exception.
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* @param string $name the property name
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* @throws InvalidCallException if the property is read only.
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*/
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public function __unset($name)
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{
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$setter = 'set' . $name;
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if (method_exists($this, $setter)) {
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$this->$setter(null);
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} elseif (method_exists($this, 'get' . $name)) {
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throw new InvalidCallException('Unsetting read-only property: ' . get_class($this) . '::' . $name);
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}
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}
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/**
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* Calls the named method which is not a class method.
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*
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* Do not call this method directly as it is a PHP magic method that
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* will be implicitly called when an unknown method is being invoked.
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* @param string $name the method name
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* @param array $params method parameters
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* @throws UnknownMethodException when calling unknown method
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* @return mixed the method return value
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*/
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public function __call($name, $params)
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{
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throw new UnknownMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
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}
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/**
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* Returns a value indicating whether a property is defined.
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* A property is defined if:
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*
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* - the class has a getter or setter method associated with the specified name
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* (in this case, property name is case-insensitive);
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* - the class has a member variable with the specified name (when `$checkVars` is true);
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*
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* @param string $name the property name
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* @param boolean $checkVars whether to treat member variables as properties
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* @return boolean whether the property is defined
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* @see canGetProperty()
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* @see canSetProperty()
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*/
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public function hasProperty($name, $checkVars = true)
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{
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return $this->canGetProperty($name, $checkVars) || $this->canSetProperty($name, false);
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}
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/**
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* Returns a value indicating whether a property can be read.
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* A property is readable if:
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*
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* - the class has a getter method associated with the specified name
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* (in this case, property name is case-insensitive);
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* - the class has a member variable with the specified name (when `$checkVars` is true);
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*
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* @param string $name the property name
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* @param boolean $checkVars whether to treat member variables as properties
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* @return boolean whether the property can be read
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* @see canSetProperty()
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*/
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public function canGetProperty($name, $checkVars = true)
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{
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return method_exists($this, 'get' . $name) || $checkVars && property_exists($this, $name);
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}
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/**
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* Returns a value indicating whether a property can be set.
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* A property is writable if:
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*
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* - the class has a setter method associated with the specified name
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* (in this case, property name is case-insensitive);
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* - the class has a member variable with the specified name (when `$checkVars` is true);
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*
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* @param string $name the property name
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* @param boolean $checkVars whether to treat member variables as properties
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* @return boolean whether the property can be written
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* @see canGetProperty()
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*/
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public function canSetProperty($name, $checkVars = true)
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{
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return method_exists($this, 'set' . $name) || $checkVars && property_exists($this, $name);
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}
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/**
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* Returns a value indicating whether a method is defined.
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*
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* The default implementation is a call to php function `method_exists()`.
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* You may override this method when you implemented the php magic method `__call()`.
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* @param string $name the method name
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* @return boolean whether the method is defined
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*/
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public function hasMethod($name)
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{
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return method_exists($this, $name);
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}
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}
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