mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
1007 lines
35 KiB
PHP
Executable File
1007 lines
35 KiB
PHP
Executable File
<?php
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/**
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* A base class for all SilverStripe objects to inherit from.
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*
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* This class provides a number of pattern implementations, as well as methods and fixes to add extra psuedo-static
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* and method functionality to PHP.
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*
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* See {@link Extension} on how to implement a custom multiple
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* inheritance for object instances based on PHP5 method call overloading.
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*
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* @todo Create instance-specific removeExtension() which removes an extension from $extension_instances,
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* but not from static $extensions, and clears everything added through defineMethods(), mainly $extra_methods.
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*
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* @package framework
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* @subpackage core
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*/
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abstract class Object {
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/**
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* An array of extension names and parameters to be applied to this object upon construction.
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*
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* Example:
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* <code>
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* public static $extensions = array (
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* 'Hierarchy',
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* "Version('Stage', 'Live')"
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* );
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* </code>
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*
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* Use {@link Object::add_extension()} to add extensions without access to the class code,
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* e.g. to extend core classes.
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*
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* Extensions are instanciated together with the object and stored in {@link $extension_instances}.
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*
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* @var array $extensions
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*/
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public static $extensions = null;
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private static
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$classes_constructed = array(),
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$extra_methods = array(),
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$built_in_methods = array();
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private static
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$custom_classes = array(),
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$strong_classes = array();
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/**#@-*/
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/**
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* @var string the class name
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*/
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public $class;
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/**
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* @todo Set this via dependancy injection? Can't call it $config, because too many clashes with form elements etc
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* @var Config_ForClass
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*/
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private $_config_forclass = null;
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/**
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* Get a configuration accessor for this class. Short hand for Config::inst()->get($this->class, .....).
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* @return Config_ForClass|null
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*/
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public function config() {
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if (!$this->_config_forclass) {
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$this->_config_forclass = Config::inst()->forClass($this->class);
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}
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return $this->_config_forclass;
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}
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/**
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* @var array all current extension instances.
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*/
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protected $extension_instances = array();
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/**
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* An implementation of the factory method, allows you to create an instance of a class
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*
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* This method first for strong class overloads (singletons & DB interaction), then custom class overloads. If an
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* overload is found, an instance of this is returned rather than the original class. To overload a class, use
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* {@link Object::useCustomClass()}
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*
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* This can be called in one of two ways - either calling via the class directly,
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* or calling on Object and passing the class name as the first parameter. The following
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* are equivalent:
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* $list = DataList::create('SiteTree');
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* $list = SiteTree::get();
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*
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* @param string $class the class name
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* @param mixed $arguments,... arguments to pass to the constructor
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* @return Object
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*/
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public static function create() {
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$args = func_get_args();
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// Class to create should be the calling class if not Object,
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// otherwise the first parameter
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$class = get_called_class();
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if($class == 'Object') $class = array_shift($args);
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$class = self::getCustomClass($class);
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return Injector::inst()->createWithArgs($class, $args);
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}
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private static $_cache_inst_args = array();
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/**
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* Create an object from a string representation. It treats it as a PHP constructor without the
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* 'new' keyword. It also manages to construct the object without the use of eval().
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*
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* Construction itself is done with Object::create(), so that Object::useCustomClass() calls
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* are respected.
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*
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* `Object::create_from_string("Versioned('Stage','Live')")` will return the result of
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* `Versioned::create('Stage', 'Live);`
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*
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* It is designed for simple, clonable objects. The first time this method is called for a given
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* string it is cached, and clones of that object are returned.
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*
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* If you pass the $firstArg argument, this will be prepended to the constructor arguments. It's
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* impossible to pass null as the firstArg argument.
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*
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* `Object::create_from_string("Varchar(50)", "MyField")` will return the result of
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* `Vachar::create('MyField', '50');`
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*
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* Arguments are always strings, although this is a quirk of the current implementation rather
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* than something that can be relied upon.
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*/
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static function create_from_string($classSpec, $firstArg = null) {
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if(!isset(self::$_cache_inst_args[$classSpec.$firstArg])) {
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// an $extension value can contain parameters as a string,
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// e.g. "Versioned('Stage','Live')"
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if(strpos($classSpec,'(') === false) {
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if($firstArg === null) self::$_cache_inst_args[$classSpec.$firstArg] = Object::create($classSpec);
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else self::$_cache_inst_args[$classSpec.$firstArg] = Object::create($classSpec, $firstArg);
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} else {
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list($class, $args) = self::parse_class_spec($classSpec);
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if($firstArg !== null) array_unshift($args, $firstArg);
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array_unshift($args, $class);
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self::$_cache_inst_args[$classSpec.$firstArg] = call_user_func_array(array('Object','create'), $args);
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}
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}
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return clone self::$_cache_inst_args[$classSpec.$firstArg];
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}
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/**
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* Parses a class-spec, such as "Versioned('Stage','Live')", as passed to create_from_string().
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* Returns a 2-elemnent array, with classname and arguments
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*/
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static function parse_class_spec($classSpec) {
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$tokens = token_get_all("<?php $classSpec");
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$class = null;
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$args = array();
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$passedBracket = false;
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// Keep track of the current bucket that we're putting data into
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$bucket = &$args;
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$bucketStack = array();
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foreach($tokens as $token) {
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$tName = is_array($token) ? $token[0] : $token;
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// Get the class naem
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if($class == null && is_array($token) && $token[0] == T_STRING) {
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$class = $token[1];
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// Get arguments
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} else if(is_array($token)) {
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switch($token[0]) {
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case T_CONSTANT_ENCAPSED_STRING:
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$argString = $token[1];
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switch($argString[0]) {
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case '"': $argString = stripcslashes(substr($argString,1,-1)); break;
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case "'": $argString = str_replace(array("\\\\", "\\'"),array("\\", "'"), substr($argString,1,-1)); break;
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default: throw new Exception("Bad T_CONSTANT_ENCAPSED_STRING arg $argString");
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}
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$bucket[] = $argString;
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break;
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case T_DNUMBER:
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$bucket[] = (double)$token[1];
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break;
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case T_LNUMBER:
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$bucket[] = (int)$token[1];
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break;
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case T_STRING:
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switch($token[1]) {
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case 'true': $args[] = true; break;
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case 'false': $args[] = false; break;
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default: throw new Exception("Bad T_STRING arg '{$token[1]}'");
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}
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case T_ARRAY:
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// Add an empty array to the bucket
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$bucket[] = array();
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$bucketStack[] = &$bucket;
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$bucket = &$bucket[sizeof($bucket)-1];
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}
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} else {
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if($tName == ')') {
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// Pop-by-reference
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$bucket = &$bucketStack[sizeof($bucketStack)-1];
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array_pop($bucketStack);
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}
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}
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}
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return array($class, $args);
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}
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/**
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* Similar to {@link Object::create()}, except that classes are only overloaded if you set the $strong parameter to
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* TRUE when using {@link Object::useCustomClass()}
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*
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* @param string $class the class name
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* @param mixed $arguments,... arguments to pass to the constructor
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* @return Object
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*/
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public static function strong_create() {
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$args = func_get_args();
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$class = array_shift($args);
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if(isset(self::$strong_classes[$class]) && ClassInfo::exists(self::$strong_classes[$class])) {
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$class = self::$strong_classes[$class];
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}
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$reflector = new ReflectionClass($class);
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return $reflector->newInstanceArgs($args);
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}
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/**
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* This class allows you to overload classes with other classes when they are constructed using the factory method
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* {@link Object::create()}
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*
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* @param string $oldClass the class to replace
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* @param string $newClass the class to replace it with
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* @param bool $strong allows you to enforce a certain class replacement under all circumstances. This is used in
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* singletons and DB interaction classes
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*/
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public static function useCustomClass($oldClass, $newClass, $strong = false) {
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if($strong) {
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self::$strong_classes[$oldClass] = $newClass;
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} else {
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self::$custom_classes[$oldClass] = $newClass;
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}
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}
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/**
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* If a class has been overloaded, get the class name it has been overloaded with - otherwise return the class name
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*
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* @param string $class the class to check
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* @return string the class that would be created if you called {@link Object::create()} with the class
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*/
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public static function getCustomClass($class) {
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if(isset(self::$strong_classes[$class]) && ClassInfo::exists(self::$strong_classes[$class])) {
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return self::$strong_classes[$class];
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} elseif(isset(self::$custom_classes[$class]) && ClassInfo::exists(self::$custom_classes[$class])) {
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return self::$custom_classes[$class];
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}
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return $class;
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}
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/**
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* Get the value of a static property of a class, even in that property is declared protected (but not private), without any inheritance,
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* merging or parent lookup if it doesn't exist on the given class.
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*
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* If using PHP 5.4, we can do this using $foo::$bar syntax. PHP 5.3 uses ReflectionClass to get the static properties instead.
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*
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* @static
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* @param $class - The class to get the static from
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* @param $name - The property to get from the class
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* @param null $default - The value to return if property doesn't exist on class
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* @return any - The value of the static property $name on class $class, or $default if that property is not defined
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*/
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public static function static_lookup($class, $name, $default = null) {
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if (PHP_MAJOR_VERSION == 5 && PHP_MINOR_VERSION >= 4 && is_subclass_of($class, 'Object')) {
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if (isset($class::$$name)) {
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$parent = get_parent_class($class);
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if (!$parent || !isset($parent::$$name) || $parent::$$name !== $class::$$name) return $class::$$name;
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}
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return $default;
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} else {
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// TODO: This gets set once, then not updated, so any changes to statics after this is called the first time for any class won't be exposed
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static $static_properties = array();
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if (!isset($static_properties[$class])) {
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$reflection = new ReflectionClass($class);
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$static_properties[$class] = $reflection->getStaticProperties();
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}
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if (isset($static_properties[$class][$name])) {
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$value = $static_properties[$class][$name];
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$parent = get_parent_class($class);
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if (!$parent) return $value;
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if (!isset($static_properties[$parent])) {
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$reflection = new ReflectionClass($parent);
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$static_properties[$parent] = $reflection->getStaticProperties();
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}
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if (!isset($static_properties[$parent][$name]) || $static_properties[$parent][$name] !== $value) return $value;
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}
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}
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return $default;
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}
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/**
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* Get a static variable, taking into account SS's inbuild static caches and pseudo-statics
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*
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* This method first checks for any extra values added by {@link Object::add_static_var()}, and attemps to traverse
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* up the extra static var chain until it reaches the top, or it reaches a replacement static.
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*
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* If any extra values are discovered, they are then merged with the default PHP static values, or in some cases
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* completely replace the default PHP static when you set $replace = true, and do not define extra data on any child
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* classes
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*
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* @param string $class
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* @param string $name the property name
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* @param bool $uncached if set to TRUE, force a regeneration of the static cache
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* @return mixed
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*/
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public static function get_static($class, $name, $uncached = false) {
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Deprecation::notice('3.1.0', 'get_static is deprecated, replaced by Config#get');
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return Config::inst()->get($class, $name, Config::FIRST_SET);
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}
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/**
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* Set a static variable
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*
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* @param string $class
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* @param string $name the property name to set
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* @param mixed $value
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*/
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public static function set_static($class, $name, $value) {
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Deprecation::notice('3.1.0', 'set_static is deprecated, replaced by Config#update');
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Config::inst()->update($class, $name, $value);
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}
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/**
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* Get an uninherited static variable - a variable that is explicity set in this class, and not in the parent class.
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*
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* @param string $class
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* @param string $name
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* @return mixed
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*/
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public static function uninherited_static($class, $name, $uncached = false) {
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Deprecation::notice('3.1.0', 'uninherited_static is deprecated, replaced by Config#get');
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return Config::inst()->get($class, $name, Config::UNINHERITED);
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}
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/**
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* Traverse down a class ancestry and attempt to merge all the uninherited static values for a particular static
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* into a single variable
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*
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* @param string $class
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* @param string $name the static name
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* @param string $ceiling an optional parent class name to begin merging statics down from, rather than traversing
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* the entire hierarchy
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* @return mixed
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*/
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public static function combined_static($class, $name, $ceiling = false) {
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if ($ceiling) throw new Exception('Ceiling argument to combined_static is no longer supported');
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Deprecation::notice('3.1.0', 'combined_static is deprecated, replaced by Config#get');
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return Config::inst()->get($class, $name);
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}
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/**
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* Merge in a set of additional static variables
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*
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* @param string $class
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* @param array $properties in a [property name] => [value] format
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* @param bool $replace replace existing static vars
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*/
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public static function addStaticVars($class, $properties, $replace = false) {
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Deprecation::notice('3.1.0', 'addStaticVars is deprecated, replaced by Config#update');
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foreach($properties as $prop => $value) self::add_static_var($class, $prop, $value, $replace);
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}
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/**
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* Add a static variable without replacing it completely if possible, but merging in with both existing PHP statics
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* and existing psuedo-statics. Uses PHP's array_merge_recursive() with if the $replace argument is FALSE.
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*
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* Documentation from http://php.net/array_merge_recursive:
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* If the input arrays have the same string keys, then the values for these keys are merged together
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* into an array, and this is done recursively, so that if one of the values is an array itself,
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* the function will merge it with a corresponding entry in another array too.
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* If, however, the arrays have the same numeric key, the later value will not overwrite the original value,
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* but will be appended.
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*
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* @param string $class
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* @param string $name the static name
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* @param mixed $value
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* @param bool $replace completely replace existing static values
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*/
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public static function add_static_var($class, $name, $value, $replace = false) {
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Deprecation::notice('3.1.0', 'add_static_var is deprecated, replaced by Config#remove and Config#update');
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if ($replace) Config::inst()->remove($class, $name);
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Config::inst()->update($class, $name, $value);
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}
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/**
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* Return TRUE if a class has a specified extension
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*
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* @param string $class
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* @param string $requiredExtension the class name of the extension to check for.
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*/
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public static function has_extension($class, $requiredExtension) {
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$requiredExtension = strtolower($requiredExtension);
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$extensions = Config::inst()->get($class, 'extensions');
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if($extensions) foreach($extensions as $extension) {
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$left = strtolower(Extension::get_classname_without_arguments($extension));
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$right = strtolower(Extension::get_classname_without_arguments($requiredExtension));
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if($left == $right) return true;
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}
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return false;
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}
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/**
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* Add an extension to a specific class.
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* As an alternative, extensions can be added to a specific class
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* directly in the {@link Object::$extensions} array.
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* See {@link SiteTree::$extensions} for examples.
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* Keep in mind that the extension will only be applied to new
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* instances, not existing ones (including all instances created through {@link singleton()}).
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*
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* @param string $class Class that should be extended - has to be a subclass of {@link Object}
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* @param string $extension Subclass of {@link Extension} with optional parameters
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* as a string, e.g. "Versioned" or "Translatable('Param')"
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*/
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public static function add_extension($class, $extension) {
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if(!preg_match('/^([^(]*)/', $extension, $matches)) {
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return false;
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}
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$extensionClass = $matches[1];
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if(!class_exists($extensionClass)) {
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user_error(sprintf('Object::add_extension() - Can\'t find extension class for "%s"', $extensionClass), E_USER_ERROR);
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}
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if(!is_subclass_of($extensionClass, 'Extension')) {
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user_error(sprintf('Object::add_extension() - Extension "%s" is not a subclass of Extension', $extensionClass), E_USER_ERROR);
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}
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// unset some caches
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$subclasses = ClassInfo::subclassesFor($class);
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$subclasses[] = $class;
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if($subclasses) foreach($subclasses as $subclass) {
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unset(self::$classes_constructed[$subclass]);
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unset(self::$extra_methods[$subclass]);
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}
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Config::inst()->update($class, 'extensions', array($extension));
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// load statics now for DataObject classes
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if(is_subclass_of($class, 'DataObject')) {
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if(!is_subclass_of($extensionClass, 'DataExtension')) {
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user_error("$extensionClass cannot be applied to $class without being a DataExtension", E_USER_ERROR);
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}
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}
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}
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/**
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* Remove an extension from a class.
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* Keep in mind that this won't revert any datamodel additions
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* of the extension at runtime, unless its used before the
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* schema building kicks in (in your _config.php).
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* Doesn't remove the extension from any {@link Object}
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* instances which are already created, but will have an
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* effect on new extensions.
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* Clears any previously created singletons through {@link singleton()}
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* to avoid side-effects from stale extension information.
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*
|
|
* @todo Add support for removing extensions with parameters
|
|
*
|
|
* @param string $class
|
|
* @param string $extension Classname of an {@link Extension} subclass, without parameters
|
|
*/
|
|
public static function remove_extension($class, $extension) {
|
|
Config::inst()->remove($class, 'extensions', Config::anything(), $extension);
|
|
|
|
// unset singletons to avoid side-effects
|
|
global $_SINGLETONS;
|
|
$_SINGLETONS = array();
|
|
|
|
// unset some caches
|
|
$subclasses = ClassInfo::subclassesFor($class);
|
|
$subclasses[] = $class;
|
|
if($subclasses) foreach($subclasses as $subclass) {
|
|
unset(self::$classes_constructed[$subclass]);
|
|
unset(self::$extra_methods[$subclass]);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param string $class
|
|
* @param bool $includeArgumentString Include the argument string in the return array,
|
|
* FALSE would return array("Versioned"), TRUE returns array("Versioned('Stage','Live')").
|
|
* @return array Numeric array of either {@link DataExtension} classnames,
|
|
* or eval'ed classname strings with constructor arguments.
|
|
*/
|
|
public static function get_extensions($class, $includeArgumentString = false) {
|
|
$extensions = Config::inst()->get($class, 'extensions');
|
|
|
|
if($includeArgumentString) {
|
|
return $extensions;
|
|
} else {
|
|
$extensionClassnames = array();
|
|
if($extensions) foreach($extensions as $extension) {
|
|
$extensionClassnames[] = Extension::get_classname_without_arguments($extension);
|
|
}
|
|
return $extensionClassnames;
|
|
}
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------------------------------------------
|
|
|
|
private static $_added_extensions = array();
|
|
|
|
public function __construct() {
|
|
$this->class = get_class($this);
|
|
|
|
// Don't bother checking some classes that should never be extended
|
|
static $notExtendable = array('Object', 'ViewableData', 'RequestHandler');
|
|
|
|
if($extensionClasses = ClassInfo::ancestry($this->class)) foreach($extensionClasses as $class) {
|
|
if(in_array($class, $notExtendable)) continue;
|
|
|
|
if($extensions = Config::inst()->get($class, 'extensions', Config::UNINHERITED)) {
|
|
foreach($extensions as $extension) {
|
|
// Get the extension class for this extension
|
|
list($extensionClass, $extensionArgs) = self::parse_class_spec($extension);
|
|
|
|
// If we haven't told that extension it's attached to this class yet, do that now
|
|
if (!isset(self::$_added_extensions[$extensionClass][$class])) {
|
|
// First call the add_to_class method - this will inherit down & is defined on Extension, so if not defined, no worries
|
|
call_user_func(array($extensionClass, 'add_to_class'), $class, $extensionClass, $extensionArgs);
|
|
|
|
// Then register it as having been told about us
|
|
if (!isset(self::$_added_extensions[$extensionClass])) self::$_added_extensions[$extensionClass] = array($class => true);
|
|
else self::$_added_extensions[$extensionClass][$class] = true;
|
|
}
|
|
|
|
$instance = self::create_from_string($extension);
|
|
$instance->setOwner(null, $class);
|
|
$this->extension_instances[$instance->class] = $instance;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(!isset(self::$classes_constructed[$this->class])) {
|
|
$this->defineMethods();
|
|
self::$classes_constructed[$this->class] = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Attemps 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 $arguments
|
|
* @return mixed
|
|
*/
|
|
public function __call($method, $arguments) {
|
|
// If the method cache was cleared by an an Object::add_extension() / Object::remove_extension()
|
|
// call, then we should rebuild it.
|
|
if(empty(self::$extra_methods[get_class($this)])) {
|
|
$this->defineMethods();
|
|
}
|
|
|
|
$method = strtolower($method);
|
|
|
|
if(isset(self::$extra_methods[$this->class][$method])) {
|
|
$config = self::$extra_methods[$this->class][$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 $retVal;
|
|
}
|
|
|
|
if($this->destroyed) {
|
|
throw new Exception (
|
|
"Object->__call(): attempt to call $method on a destroyed $this->class object"
|
|
);
|
|
} else {
|
|
throw new Exception (
|
|
"Object->__call(): $this->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 Exception (
|
|
"Object->__call(): extra method $method is invalid on $this->class:" . var_export($config, true)
|
|
);
|
|
}
|
|
} else {
|
|
// Please do not change the exception code number below.
|
|
|
|
throw new Exception("Object->__call(): the method '$method' does not exist on '$this->class'", 2175);
|
|
}
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* 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) {
|
|
return method_exists($this, $method) || isset(self::$extra_methods[$this->class][strtolower($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) {
|
|
if(!isset(self::$built_in_methods[$this->class])) {
|
|
self::$built_in_methods[$this->class] = array_map('strtolower', get_class_methods($this));
|
|
}
|
|
|
|
if($custom && isset(self::$extra_methods[$this->class])) {
|
|
return array_merge(self::$built_in_methods[$this->class], array_keys(self::$extra_methods[$this->class]));
|
|
} else {
|
|
return self::$built_in_methods[$this->class];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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', $key);
|
|
}
|
|
|
|
if(isset($_REQUEST['debugmethods']) && isset(self::$built_in_methods[$this->class])) {
|
|
Debug::require_developer_login();
|
|
|
|
echo '<h2>Methods defined on ' . $this->class . '</h2><ul>';
|
|
foreach(self::$built_in_methods[$this->class] as $method) {
|
|
echo "<li>$method</li>";
|
|
}
|
|
echo '</ul>';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 $index an index to use if the property is an array
|
|
*/
|
|
protected function addMethodsFrom($property, $index = null) {
|
|
$extension = ($index !== null) ? $this->{$property}[$index] : $this->$property;
|
|
|
|
if(!$extension) {
|
|
throw new InvalidArgumentException (
|
|
"Object->addMethodsFrom(): could not add methods from {$this->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[$this->class])) {
|
|
self::$extra_methods[$this->class] =
|
|
array_merge(self::$extra_methods[$this->class], $newMethods);
|
|
} else {
|
|
self::$extra_methods[$this->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, $wrap) {
|
|
self::$extra_methods[$this->class][strtolower($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, $code) {
|
|
self::$extra_methods[$this->class][strtolower($method)] = array (
|
|
'function' => create_function('$obj, $args', $code)
|
|
);
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* @see Object::get_static()
|
|
*/
|
|
public function stat($name, $uncached = false) {
|
|
return Config::inst()->get(($this->class ? $this->class : get_class($this)), $name, Config::FIRST_SET);
|
|
}
|
|
|
|
/**
|
|
* @see Object::set_static()
|
|
*/
|
|
public function set_stat($name, $value) {
|
|
Config::inst()->update(($this->class ? $this->class : get_class($this)), $name, $value);
|
|
}
|
|
|
|
/**
|
|
* @see Object::uninherited_static()
|
|
*/
|
|
public function uninherited($name) {
|
|
return Config::inst()->get(($this->class ? $this->class : get_class($this)), $name, Config::UNINHERITED);
|
|
}
|
|
|
|
/**
|
|
* @deprecated
|
|
*/
|
|
public function set_uninherited() {
|
|
Deprecation::notice('2.4', 'Use a custom static on your object instead.');
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Return true if this object "exists" i.e. has a sensible value
|
|
*
|
|
* This method should be overriden in subclasses to provide more context about the classes state. For example, a
|
|
* {@link DataObject} class could return false when it is deleted from the database
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function exists() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @return string this classes parent class
|
|
*/
|
|
public function parentClass() {
|
|
return get_parent_class($this);
|
|
}
|
|
|
|
/**
|
|
* Check if this class is an instance of a specific class, or has that class as one of its parents
|
|
*
|
|
* @param string $class
|
|
* @return bool
|
|
*/
|
|
public function is_a($class) {
|
|
return $this instanceof $class;
|
|
}
|
|
|
|
/**
|
|
* @return string the class name
|
|
*/
|
|
public function __toString() {
|
|
return $this->class;
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Calls a method if available on both this object and all applied {@link Extensions}, and then attempts to merge
|
|
* all results into an array
|
|
*
|
|
* @param string $method the method name to call
|
|
* @param mixed $argument a single argument to pass
|
|
* @return mixed
|
|
* @todo integrate inheritance rules
|
|
*/
|
|
public function invokeWithExtensions($method, $argument = null) {
|
|
$result = method_exists($this, $method) ? array($this->$method($argument)) : array();
|
|
$extras = $this->extend($method, $argument);
|
|
|
|
return $extras ? array_merge($result, $extras) : $result;
|
|
}
|
|
|
|
/**
|
|
* Run the given function on all of this object's extensions. Note that this method originally returned void, so if
|
|
* you wanted to return results, you're hosed
|
|
*
|
|
* 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 extension. 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.
|
|
*
|
|
* 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 $a1,... up to 7 arguments to be passed to the method
|
|
* @return array
|
|
*/
|
|
public function extend($method, &$a1=null, &$a2=null, &$a3=null, &$a4=null, &$a5=null, &$a6=null, &$a7=null) {
|
|
$values = array();
|
|
|
|
if($this->extension_instances) foreach($this->extension_instances as $instance) {
|
|
if(method_exists($instance, $method)) {
|
|
$instance->setOwner($this);
|
|
$value = $instance->$method($a1, $a2, $a3, $a4, $a5, $a6, $a7);
|
|
if($value !== null) $values[] = $value;
|
|
$instance->clearOwner();
|
|
}
|
|
}
|
|
|
|
return $values;
|
|
}
|
|
|
|
/**
|
|
* Get an extension instance attached to this object by name.
|
|
*
|
|
* @uses hasExtension()
|
|
*
|
|
* @param string $extension
|
|
* @return Extension
|
|
*/
|
|
public function getExtensionInstance($extension) {
|
|
if($this->hasExtension($extension)) return $this->extension_instances[$extension];
|
|
}
|
|
|
|
/**
|
|
* 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 extended 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 $extension Classname of an {@link Extension} subclass without parameters
|
|
* @return bool
|
|
*/
|
|
public function hasExtension($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 DataExtension} instances, keyed by classname.
|
|
*/
|
|
public function getExtensionInstances() {
|
|
return $this->extension_instances;
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Cache the results of an instance method in this object to a file, or if it is already cache return the cached
|
|
* results
|
|
*
|
|
* @param string $method the method name to cache
|
|
* @param int $lifetime the cache lifetime in seconds
|
|
* @param string $ID custom cache ID to use
|
|
* @param array $arguments an optional array of arguments
|
|
* @return mixed the cached data
|
|
*/
|
|
public function cacheToFile($method, $lifetime = 3600, $ID = false, $arguments = array()) {
|
|
if(!$this->hasMethod($method)) {
|
|
throw new InvalidArgumentException("Object->cacheToFile(): the method $method does not exist to cache");
|
|
}
|
|
|
|
$cacheName = $this->class . '_' . $method;
|
|
|
|
if(!is_array($arguments)) $arguments = array($arguments);
|
|
|
|
if($ID) $cacheName .= '_' . $ID;
|
|
if(count($arguments)) $cacheName .= '_' . implode('_', $arguments);
|
|
|
|
if($data = $this->loadCache($cacheName, $lifetime)) {
|
|
return $data;
|
|
}
|
|
|
|
$data = call_user_func_array(array($this, $method), $arguments);
|
|
$this->saveCache($cacheName, $data);
|
|
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* Clears the cache for the given cacheToFile call
|
|
*/
|
|
public function clearCache($method, $ID = false, $arguments = array()) {
|
|
$cacheName = $this->class . '_' . $method;
|
|
if(!is_array($arguments)) $arguments = array($arguments);
|
|
if($ID) $cacheName .= '_' . $ID;
|
|
if(count($arguments)) $cacheName .= '_' . implode('_', $arguments);
|
|
|
|
$file = TEMP_FOLDER . '/' . $this->sanitiseCachename($cacheName);
|
|
if(file_exists($file)) unlink($file);
|
|
}
|
|
|
|
/**
|
|
* Loads a cache from the filesystem if a valid on is present and within the specified lifetime
|
|
*
|
|
* @param string $cache the cache name
|
|
* @param int $lifetime the lifetime (in seconds) of the cache before it is invalid
|
|
* @return mixed
|
|
*/
|
|
protected function loadCache($cache, $lifetime = 3600) {
|
|
$path = TEMP_FOLDER . '/' . $this->sanitiseCachename($cache);
|
|
|
|
if(!isset($_REQUEST['flush']) && file_exists($path) && (filemtime($path) + $lifetime) > time()) {
|
|
return unserialize(file_get_contents($path));
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Save a piece of cached data to the file system
|
|
*
|
|
* @param string $cache the cache name
|
|
* @param mixed $data data to save (must be serializable)
|
|
*/
|
|
protected function saveCache($cache, $data) {
|
|
file_put_contents(TEMP_FOLDER . '/' . $this->sanitiseCachename($cache), serialize($data));
|
|
}
|
|
|
|
/**
|
|
* Strip a file name of special characters so it is suitable for use as a cache file name
|
|
*
|
|
* @param string $name
|
|
* @return string the name with all special cahracters replaced with underscores
|
|
*/
|
|
protected function sanitiseCachename($name) {
|
|
return str_replace(array('~', '.', '/', '!', ' ', "\n", "\r", "\t", '\\', ':', '"', '\'', ';'), '_', $name);
|
|
}
|
|
|
|
}
|