silverstripe-framework/core/CustomMethods.php
Damian Mooyman 829135a85a API remove Object::useCustomClass
API Broke out Injectable, Configurable, and Extensible from Object into traits
BUG Fix missing extraDataObjects in tests
2016-02-17 10:22:04 +13:00

242 lines
7.1 KiB
PHP

<?php
namespace SilverStripe\Framework\Core;
use BadMethodCallException;
use InvalidArgumentException;
/**
* Allows an object to declare a set of custom methods
*/
trait CustomMethods {
/**
* Custom method sources
*
* @var array
*/
protected static $extra_methods = array();
/**
* Name of methods to invoke by defineMethods for this instance
*
* @var array
*/
protected $extra_method_registers = array();
/**
* Non-custom methods
*
* @var array
*/
protected static $built_in_methods = array();
/**
* Attempts to locate and call a method dynamically added to a class at runtime if a default cannot be located
*
* You can add extra methods to a class using {@link Extensions}, {@link Object::createMethod()} or
* {@link Object::addWrapperMethod()}
*
* @param string $method
* @param array $arguments
* @return mixed
* @throws BadMethodCallException
*/
public function __call($method, $arguments) {
// If the method cache was cleared by an an Object::add_extension() / Object::remove_extension()
// call, then we should rebuild it.
$class = get_class($this);
if(!array_key_exists($class, self::$extra_methods)) {
$this->defineMethods();
}
// Validate method being invked
$method = strtolower($method);
if(!isset(self::$extra_methods[$class][$method])) {
// Please do not change the exception code number below.
$class = get_class($this);
throw new BadMethodCallException("Object->__call(): the method '$method' does not exist on '$class'", 2175);
}
$config = self::$extra_methods[$class][$method];
switch(true) {
case isset($config['property']) :
$obj = $config['index'] !== null ?
$this->{$config['property']}[$config['index']] :
$this->{$config['property']};
if($obj) {
if(!empty($config['callSetOwnerFirst'])) $obj->setOwner($this);
$retVal = call_user_func_array(array($obj, $method), $arguments);
if(!empty($config['callSetOwnerFirst'])) $obj->clearOwner();
return $retVal;
}
if(!empty($this->destroyed)) {
throw new BadMethodCallException(
"Object->__call(): attempt to call $method on a destroyed $class object"
);
} else {
throw new BadMethodCallException(
"Object->__call(): $class cannot pass control to $config[property]($config[index])."
. ' Perhaps this object was mistakenly destroyed?'
);
}
case isset($config['wrap']) :
array_unshift($arguments, $config['method']);
return call_user_func_array(array($this, $config['wrap']), $arguments);
case isset($config['function']) :
return $config['function']($this, $arguments);
default :
throw new BadMethodCallException(
"Object->__call(): extra method $method is invalid on $class:"
. var_export($config, 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() {
$class = get_class($this);
// Define from all registered callbacks
foreach($this->extra_method_registers as $callback) {
call_user_func($callback);
}
}
/**
* Register an callback to invoke that defines extra methods
*
* @param string $name
* @param callable $callback
*/
protected function registerExtraMethodCallback($name, $callback) {
if(!isset($this->extra_method_registers[$name])) {
$this->extra_method_registers[$name] = $callback;
}
}
// --------------------------------------------------------------------------------------------------------------
/**
* Return TRUE if a method exists on this object
*
* This should be used rather than PHP's inbuild method_exists() as it takes into account methods added via
* extensions
*
* @param string $method
* @return bool
*/
public function hasMethod($method) {
$class = get_class($this);
return method_exists($this, $method) || isset(self::$extra_methods[$class][strtolower($method)]);
}
/**
* Return the names of all the methods available on this object
*
* @param bool $custom include methods added dynamically at runtime
* @return array
*/
public function allMethodNames($custom = false) {
$class = get_class($this);
if(!isset(self::$built_in_methods[$class])) {
self::$built_in_methods[$class] = array_map('strtolower', get_class_methods($this));
}
if($custom && isset(self::$extra_methods[$class])) {
return array_merge(self::$built_in_methods[$class], array_keys(self::$extra_methods[$class]));
} else {
return self::$built_in_methods[$class];
}
}
/**
* 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 $index an index to use if the property is an array
* @throws InvalidArgumentException
*/
protected function addMethodsFrom($property, $index = null) {
$class = get_class($this);
$extension = ($index !== null) ? $this->{$property}[$index] : $this->$property;
if(!$extension) {
throw new InvalidArgumentException (
"Object->addMethodsFrom(): could not add methods from {$class}->{$property}[$index]"
);
}
if(method_exists($extension, 'allMethodNames')) {
$methods = $extension->allMethodNames(true);
} else {
if(!isset(self::$built_in_methods[$extension->class])) {
self::$built_in_methods[$extension->class] = array_map('strtolower', get_class_methods($extension));
}
$methods = self::$built_in_methods[$extension->class];
}
if($methods) {
$methodInfo = array(
'property' => $property,
'index' => $index,
'callSetOwnerFirst' => $extension instanceof \Extension,
);
$newMethods = array_fill_keys($methods, $methodInfo);
if(isset(self::$extra_methods[$class])) {
self::$extra_methods[$class] =
array_merge(self::$extra_methods[$class], $newMethods);
} else {
self::$extra_methods[$class] = $newMethods;
}
}
}
/**
* Add a wrapper method - a method which points to another method with a different name. For example, Thumbnail(x)
* can be wrapped to generateThumbnail(x)
*
* @param string $method the method name to wrap
* @param string $wrap the method name to wrap to
*/
protected function addWrapperMethod($method, $wrap) {
$class = get_class($this);
self::$extra_methods[$class][strtolower($method)] = array (
'wrap' => $wrap,
'method' => $method
);
}
/**
* Add an extra method using raw PHP code passed as a string
*
* @param string $method the method name
* @param string $code the PHP code - arguments will be in an array called $args, while you can access this object
* by using $obj. Note that you cannot call protected methods, as the method is actually an external
* function
*/
protected function createMethod($method, $code) {
$class = get_class($this);
self::$extra_methods[$class][strtolower($method)] = array (
'function' => create_function('$obj, $args', $code)
);
}
}