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datatable.directory/porklib/Utils/Enum.php

86 lines
2.1 KiB

6 years ago
<?php
namespace MightyPork\Utils;
use MightyPork\Exceptions\NotExistException;
use ReflectionClass;
/** Trait for checking if const is defined in class */
trait Enum
{
private static $cache_enum_constants = null;
/**
* Get all constants
*
* @param string $prefix required name prefix (filter)
* @return array name -> value array
*/
public static function getConstants($prefix = '')
{
if (static::$cache_enum_constants != null) return static::$cache_enum_constants;
$map = (new ReflectionClass(static::class))->getConstants();
$selected = [];
foreach ($map as $k => $v) {
if ($prefix === '' || strpos($k, $prefix) === 0) {
$selected[$k] = $v;
}
}
static::$cache_enum_constants = $selected;
return $selected;
}
/**
* Check if a constant with a given value is defined in this class.
*
* @param mixed $value checked value
* @param string $prefix required name prefix
* @return bool
*/
public static function isDefined($value, $prefix = '')
{
return in_array($value, static::getConstants($prefix));
}
/**
* Check if a constant with a given name is defined in this class.
*
* @param string $name checked name
* @param string $prefix required name prefix
* @return bool
*/
public static function hasConstant($name, $prefix = '')
{
return array_key_exists($name, static::getConstants($prefix));
}
/**
* Get constant value dynamically by name
*
* @param string $name
* @return mixed
*/
public static function forName($name)
{
return constant(static::class . '::' . $name);
}
/**
* Get constant name by it's value
*
* @param mixed $value
* @return string
*/
public static function nameOf($value)
{
$k = array_search($value, static::getConstants());
if ($k == false)
throw new NotExistException("Invalid value '$value' for enum " . static::class);
return $k;
}
}