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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;

use EmptyIterator;

/**
 * @extends Option<mixed>
 */
final class None extends Option
{
    /** @var None|null */
    private static $instance;

/**
     * @return None
     */
    public static function create(): self
    {
        if (null === self::$instance) {
            self::$instance = new self();
        }

return self::$instance;
    }

public function get()
    {
        throw new \RuntimeException('None has no value.');
    }

public function getOrCall($callable)
    {
        return $callable();
    }

public function getOrElse($default)
    {
        return $default;
    }

public function getOrThrow(\Exception $ex)
    {
        throw $ex;
    }

public function isEmpty(): bool
    {
        return true;
    }

public function isDefined(): bool
    {
        return false;
    }

public function orElse(Option $else)
    {
        return $else;
    }

public function ifDefined($callable)
    {
        // Just do nothing in that case.
    }

public function forAll($callable)
    {
        return $this;
    }

public function map($callable)
    {
        return $this;
    }

public function flatMap($callable)
    {
        return $this;
    }

public function filter($callable)
    {
        return $this;
    }

public function filterNot($callable)
    {
        return $this;
    }

public function select($value)
    {
        return $this;
    }

public function reject($value)
    {
        return $this;
    }

public function getIterator(): EmptyIterator
    {
        return new EmptyIterator();
    }

public function foldLeft($initialValue, $callable)
    {
        return $initialValue;
    }

public function foldRight($initialValue, $callable)
    {
        return $initialValue;
    }

private function __construct()
    {
    }
}

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