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<?php
/*
* Copyright 2012 Johannes M. Schmitt <schmittjoh@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace PhpOption;
final class LazyOption extends Option
{
/** @var callable */
private $callback;
/** @var array */
private $arguments;
/** @var Option|null */
private $option;
/**
* Helper Constructor.
*
* @param callable $callback
* @param array $arguments
*
* @return LazyOption
*/
public static function create($callback, array $arguments = array())
{
return new self($callback, $arguments);
}
/**
* Constructor.
*
* @param callable $callback
* @param array $arguments
*/
public function __construct($callback, array $arguments = array())
{
if (!is_callable($callback)) {
throw new \InvalidArgumentException('Invalid callback given');
}
$this->callback = $callback;
$this->arguments = $arguments;
}
public function isDefined()
{
return $this->option()->isDefined();
}
public function isEmpty()
{
return $this->option()->isEmpty();
}
public function get()
{
return $this->option()->get();
}
public function getOrElse($default)
{
return $this->option()->getOrElse($default);
}
public function getOrCall($callable)
{
return $this->option()->getOrCall($callable);
}
public function getOrThrow(\Exception $ex)
{
return $this->option()->getOrThrow($ex);
}
public function orElse(Option $else)
{
return $this->option()->orElse($else);
}
/**
* @deprecated Use forAll() instead.
*/
public function ifDefined($callable)
{
$this->option()->ifDefined($callable);
}
public function forAll($callable)
{
return $this->option()->forAll($callable);
}
public function map($callable)
{
return $this->option()->map($callable);
}
public function flatMap($callable)
{
return $this->option()->flatMap($callable);
}
public function filter($callable)
{
return $this->option()->filter($callable);
}
public function filterNot($callable)
{
return $this->option()->filterNot($callable);
}
public function select($value)
{
return $this->option()->select($value);
}
public function reject($value)
{
return $this->option()->reject($value);
}
public function getIterator()
{
return $this->option()->getIterator();
}
public function foldLeft($initialValue, $callable)
{
return $this->option()->foldLeft($initialValue, $callable);
}
public function foldRight($initialValue, $callable)
{
return $this->option()->foldRight($initialValue, $callable);
}
/**
* @return Option
*/
private function option()
{
if (null === $this->option) {
$this->option = call_user_func_array($this->callback, $this->arguments);
if (!$this->option instanceof Option) {
$this->option = null;
throw new \RuntimeException('Expected instance of \PhpOption\Option');
}
}
return $this->option;
}
}
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