InMemory.php

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<?php
namespace Elgg\Structs\Collection;

use Elgg\Structs\Collection;

final class InMemory implements Collection {
    private $items;
    
    private function __construct(array $items = array()) {
        $this->items = $items;
    }
    
    public function contains($item) {
        return in_array($item, $this->items, true);
    }

    public function count() {
        return count($this->items);
    }
    
    public function current() {
        return current($this->items);
    }
    
    public function filter(callable $filter) {
        $results = array();
        
        foreach ($this->items as $item) {
            if ($filter($item)) {
                $results[] = $item;
            }
        }
        
        return new self($results);
    }
    
    public function key() {
        return key($this->items);
    }
    
    public function map(callable $mapper) {
        $results = array();
        foreach ($this->items as $item) {
            $results[] = $mapper($item);
        }
        return self::fromArray($results);
    }
    
    public function next() {
        return next($this->items);
    }
    
    public function rewind() {
        reset($this->items);
    }
    
    public function valid() {
        return key($this->items) !== NULL;
    }
    
    public static function fromArray(array $items) {
        return new self($items);
    }
}