105 lines
2.0 KiB
PHP
105 lines
2.0 KiB
PHP
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<?php
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namespace Zxing\Common;
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use \Zxing\NotFoundException;
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use ReflectionClass;
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/**
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* A general enum implementation until we got SplEnum.
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*/
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final class AbstractEnum
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{
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/**
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* Default value.
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*/
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const __default = null;
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/**
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* Current value.
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*
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* @var mixed
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*/
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protected $value;
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/**
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* Cache of constants.
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*
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* @var array
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*/
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protected $constants;
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/**
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* Whether to handle values strict or not.
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*
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* @var boolean
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*/
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protected $strict;
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/**
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* Creates a new enum.
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*
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* @param mixed $initialValue
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* @param boolean $strict
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*/
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public function __construct($initialValue = null, $strict = false)
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{
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$this->strict = $strict;
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$this->change($initialValue);
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}
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/**
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* Changes the value of the enum.
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*
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* @param mixed $value
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*
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* @return void
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*/
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public function change($value)
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{
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if (!in_array($value, $this->getConstList(), $this->strict)) {
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throw new \UnexpectedValueException('Value not a const in enum ' . get_class($this));
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}
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$this->value = $value;
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}
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/**
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* Gets all constants (possible values) as an array.
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*
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* @param boolean $includeDefault
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*
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* @return array
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*/
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public function getConstList($includeDefault = true)
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{
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if ($this->constants === null) {
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$reflection = new ReflectionClass($this);
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$this->constants = $reflection->getConstants();
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}
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if ($includeDefault) {
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return $this->constants;
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}
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$constants = $this->constants;
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unset($constants['__default']);
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return $constants;
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}
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/**
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* Gets current value.
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*
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* @return mixed
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*/
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public function get()
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{
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return $this->value;
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}
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/**
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* Gets the name of the enum.
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*
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* @return string
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*/
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public function __toString()
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{
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return (string)array_search($this->value, $this->getConstList());
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}
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}
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