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* APPENDIX: How to apply the Apache License to your work.
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* Copyright 2014 Ahmed Magdy Ezzeldin
*
* Licensed under the Apache License, Version 2.0 (the "License");
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/**
* @author Ahmed Magdy <a.magdy@a1works.com>
* @url https://github.com/amagdy/PHP_Enum
*
*
* This class should be the parent class of any Enum
*/
class Enum {
protected $name = NULL; // String: The key of an Enum item
protected $value = NULL; // Mixed: The value of an Enum item
/**
* Returns the name (key) of an Enum item as a string
* @return String
*/
public function getName(){
return $this->name;
}
/**
* Returns the value of an Enum item
* @return mixed
*/
public function getValue(){
return $this->value;
}
/**
* Returns a string representation of the enum item which is its name
*/
public function __toString()
{
return $this->name;
}
/**
* This class cannot not be instantiated using the new keyword from code outside the class
*/
private function __construct($name, $val=NULL){
$this->name = $name;
$this->value = $val;
}
private static function is_valid_var_name($str){
return preg_match('/^[a-zA-Z_][a-zA-Z0-9_]*$/', $str);
}
protected static $is_initialized = false;
protected static $enum_items = array(); // the enum items array of key names and enum item values as Enum class instances
protected static $arr_params = array(); // the enum items keys and their original values
/**
* Initializes the enum and it is called only once
*/
protected static function initialize(){
$cls_name = get_called_class();
if ($cls_name::$is_initialized) return true;
$ref_cls = new ReflectionClass($cls_name);
if (empty($cls_name::$arr_params)) {
$cls_name::$arr_params = $ref_cls->getConstants();
}
$arr = $cls_name::$arr_params;
foreach ($arr as $k => $v) {
$cls_name::$enum_items[$k] = new $cls_name($k, $v);
}
$cls_name::$is_initialized = true;
return true;
}
/**
* This is a PHP magic function called whenever we want to access an enum item
* so it checks the enum item in an internal array and returns it
* @param $method_name String: is the enum item key name
* @param $arguments Null in our case here
* @return enum item of the same type as the current class or trigger_error if
* this enum item is not found
*/
public static function __callStatic($method_name, $arguments){
$cls_name = get_called_class();
$cls_name::initialize();
if (!in_array($method_name, array_keys($cls_name::$enum_items))) {
return trigger_error("Invalid Enum $cls_name::$method_name", E_USER_ERROR);
} else {
return $cls_name::$enum_items[$method_name];
}
}
/**
* Set the keys and values of the Enum items
* @param $arr_keys array(String => mixed) or array(String)
*/
public static function setKeys($arr_keys) {
if (is_array($arr_keys)) {
$enum_class_name = get_called_class();
foreach ($arr_keys as $k => $v) {
if (Enum::is_valid_var_name($k)) {
$enum_class_name::$arr_params[$k] = $v;
} else {
if (Enum::is_valid_var_name($v)) {
$enum_class_name::$arr_params[$v] = NULL;
} else {
return trigger_error("Invalid Enum key $enum_class_name::$v", E_USER_ERROR);
}
}
}
}
}
/**
* Returns all the keys and values
*/
public static function getKeys(){
$enum_class_name = get_called_class();
$enum_class_name::initialize();
return $enum_class_name::$enum_items;
}
}
/**
* Utility function to create an Enum
* @param $enum_class_name String the name of the class of the enum item it must follow the class naming standard
* @param $keys array(String => mixed) or array(String) the keys and values of the enum items the keys must follow the variable naming standard and the values are mixed.
* @see Enum
*/
function enum($enum_class_name, array $keys){
if (!preg_match('/^[A-Z][a-zA-Z0-9_]*$/', $enum_class_name)) {
return trigger_error("$enum_class_name is not a valid Enum name. Enum name must start with a capital letter and must follow the class naming standards.");
}
$str = "class $enum_class_name extends Enum {}";
eval($str);
$enum_class_name::setKeys($keys);
}
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