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<?php
/**
* This file is part of the ramsey/collection library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
*/
declare(strict_types=1);
namespace Ramsey\Collection;
/**
* A collection represents a group of objects.
*
* Each object in the collection is of a specific, defined type.
*
* This is a direct implementation of `CollectionInterface`, provided for
* the sake of convenience.
*
* Example usage:
*
* ``` php
* $collection = new \Ramsey\Collection\Collection('My\\Foo');
* $collection->add(new \My\Foo());
* $collection->add(new \My\Foo());
*
* foreach ($collection as $foo) {
* // Do something with $foo
* }
* ```
*
* It is preferable to subclass `AbstractCollection` to create your own typed
* collections. For example:
*
* ``` php
* namespace My\Foo;
*
* class FooCollection extends \Ramsey\Collection\AbstractCollection
* {
* public function getType()
* {
* return 'My\\Foo';
* }
* }
* ```
*
* And then use it similarly to the earlier example:
*
* ``` php
* $fooCollection = new \My\Foo\FooCollection();
* $fooCollection->add(new \My\Foo());
* $fooCollection->add(new \My\Foo());
*
* foreach ($fooCollection as $foo) {
* // Do something with $foo
* }
* ```
*
* The benefit with this approach is that you may do type-checking on the
* collection object:
*
* ``` php
* if ($collection instanceof \My\Foo\FooCollection) {
* // the collection is a collection of My\Foo objects
* }
* ```
*
* @template T
* @template-extends AbstractCollection<T>
*/
class Collection extends AbstractCollection
{
/**
* The type of elements stored in this collection.
*
* A collection's type is immutable once it is set. For this reason, this
* property is set private.
*
* @var string
*/
private $collectionType;
/**
* Constructs a collection object of the specified type, optionally with the
* specified data.
*
* @param string $collectionType The type (FQCN) associated with this
* collection.
* @param array<array-key, T> $data The initial items to store in the collection.
*/
public function __construct(string $collectionType, array $data = [])
{
$this->collectionType = $collectionType;
parent::__construct($data);
}
public function getType(): string
{
return $this->collectionType;
}
}
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