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<?php

namespace serhatozdal\optional;

/**

* @author serhatozdal

*/

final class Optional

{

private $value;

private function __construct($value)

{

$this->value = $value;

}

public static function ofEmpty()

{

return new self(null);

}

public static function of($value)

{

return new self(self::requireNonNull($value));

}

public static function ofNullable($value)

{

return $value === null ? self::ofEmpty() : self::of($value);

}

public function get()

{

return self::requireNonNull($this->value);

}

public function isPresent()

{

return $this->value !== null;

}

public function ifPresent(callable $consumer)

{

if ($this->isPresent())

$consumer($this->value);

}

public function filter(callable $predicate)

{

if (!$this->isPresent())

return $this;

return $predicate($this->value) ? $this : self::ofEmpty();

}

public function map(callable $mapper)

{

if (!$this->isPresent())

return self::ofEmpty();

return self::ofNullable($mapper($this->value));

}

public function flatMap(callable $mapper)

{

if (!$this->isPresent())

return self::ofEmpty();

return self::requireNonNull($mapper($this->value));

}

public function orElse($other)

{

return $this->isPresent() ? $this->value : $other;

}

public function orElseGet(callable $other)

{

return $this->isPresent() ? $this->value : $other();

}

public function orElseThrow(callable $exceptionSupplier)

{

return $this->isPresent() ? $this->value : $exceptionSupplier();

}

private static function requireNonNull($obj)

{

if ($obj === null)

throw new \InvalidArgumentException("variable can not be null!!");

return $obj;

}

public function __toString()

{

return $this->isPresent() ? sprintf("Optional[%s]", $this->value) : "Optional.ofEmpty";

}

}