<?php



/**

 * Nette Framework

 *

 * @copyright  Copyright (c) 2004, 2010 David Grudl

 * @license    http://nettephp.com/license  Nette license

 * @link       http://nettephp.com

 * @category   Nette

 * @package    Nette\Collections

 */







/**

 * SPL ArrayObject customization.

 *

 * @copyright  Copyright (c) 2004, 2010 David Grudl

 * @package    Nette\Collections

 *

 * @property-read bool $frozen

 */

abstract class Collection extends ArrayObject implements ICollection

{

	/** @var string  type (class, interface, PHP type) */

	private $itemType;



	/** @var string  function to verify type */

	private $checkFunc;



	/** @var bool */

	private $frozen = FALSE;







	/**

	 * @param  array to wrap

	 * @param  string class/interface name or ':type'

	 * @throws InvalidArgumentException

	 */

	public function __construct($arr = NULL, $type = NULL)

	{

		if (substr($type, 0, 1) === ':') {

			$this->itemType = substr($type, 1);

			$this->checkFunc = 'is_' . $this->itemType;

		} else {

			$this->itemType = $type;

		}



		if ($arr !== NULL) {

			$this->import($arr);

		}

	}







	/**

	 * Appends the specified element to the end of this collection.

	 * @param  mixed

	 * @return void

	 * @throws InvalidArgumentException

	 */

	public function append($item)

	{

		$this->beforeAdd($item);

		parent::append($item);

	}







	/**

	 * Removes the first occurrence of the specified element.

	 * @param  mixed

	 * @return bool  true if this collection changed as a result of the call

	 * @throws NotSupportedException

	 */

	public function remove($item)

	{

		$this->updating();

		$index = $this->search($item);

		if ($index === FALSE) {

			return FALSE;

		} else {

			parent::offsetUnset($index);

			return TRUE;

		}

	}







	/**

	 * Returns the index of the first occurrence of the specified element,.

	 * or FALSE if this collection does not contain this element.

	 * @param  mixed

	 * @return int|FALSE

	 */

	protected function search($item)

	{

		return array_search($item, $this->getArrayCopy(), TRUE);

	}







	/**

	 * Removes all of the elements from this collection.

	 * @return void

	 * @throws NotSupportedException

	 */

	public function clear()

	{

		$this->updating();

		parent::exchangeArray(array());

	}







	/**

	 * Returns true if this collection contains the specified item.

	 * @param  mixed

	 * @return bool

	 */

	public function contains($item)

	{

		return $this->search($item) !== FALSE;

	}







	/**

	 * Import from array or any traversable object.

	 * @param  array|\Traversable

	 * @return void

	 * @throws InvalidArgumentException

	 */

	public function import($arr)

	{

		if (!(is_array($arr) || $arr instanceof Traversable)) {

			throw new InvalidArgumentException("Argument must be traversable.");

		}



		$this->clear();

		foreach ($arr as $item) {

			$this->offsetSet(NULL, $item);

		}

	}







	/**

	 * Returns the item type.

	 * @return string

	 */

	public function getItemType()

	{

		return $this->itemType;

	}







	/**

	 * @deprecated

	 */

	public function setReadOnly()

	{

		throw new DeprecatedException(__METHOD__ . '() is deprecated; use freeze() instead.');

	}







	/**

	 * @deprecated

	 */

	public function isReadOnly()

	{

		throw new DeprecatedException(__METHOD__ . '() is deprecated; use isFrozen() instead.');

	}







	/********************* internal notifications ****************d*g**/







	/**

	 * Responds when the item is about to be added to the collection.

	 * @param  mixed

	 * @return void

	 * @throws InvalidArgumentException, \NotSupportedException

	 */

	protected function beforeAdd($item)

	{

		$this->updating();



		if ($this->itemType !== NULL) {

			if ($this->checkFunc === NULL) {

				if (!($item instanceof $this->itemType)) {

					throw new InvalidArgumentException("Item must be '$this->itemType' object.");

				}

			} else {

				$fnc = $this->checkFunc;

				if (!$fnc($item)) {

					throw new InvalidArgumentException("Item must be $this->itemType type.");

				}

			}

		}

	}







	/********************* ArrayObject cooperation ****************d*g**/







	/**

	 * Returns the iterator.

	 * @return ArrayIterator

	 */

	public function getIterator()

	{

		return new ArrayIterator($this->getArrayCopy());

	}







	/**

	 * Not supported. Use import().

	 */

	public function exchangeArray($array)

	{

		throw new NotSupportedException('Use ' . __CLASS__ . '::import()');

	}







	/**

	 * Protected exchangeArray().

	 * @param  array  new array

	 * @return Collection  provides a fluent interface

	 */

	protected function setArray($array)

	{

		parent::exchangeArray($array);

		return $this;

	}







	/********************* Nette\Object behaviour ****************d*g**/







	/**

	 * @return ClassReflection

	 */

	public function getReflection()

	{

		return new ClassReflection($this);

	}







	/**

	 * Call to undefined method.

	 *

	 * @throws MemberAccessException

	 */

	public function __call($name, $args)

	{

		return ObjectMixin::call($this, $name, $args);

	}







	/**

	 * Call to undefined static method.

	 *

	 * @throws MemberAccessException

	 */

	public static function __callStatic($name, $args)

	{

		$class = get_called_class();

		throw new MemberAccessException("Call to undefined static method $class::$name().");

	}







	/**

	 * Returns property value. Do not call directly.

	 *

	 * @throws MemberAccessException if the property is not defined.

	 */

	public function &__get($name)

	{

		return ObjectMixin::get($this, $name);

	}







	/**

	 * Sets value of a property. Do not call directly.

	 *

	 * @throws MemberAccessException if the property is not defined or is read-only

	 */

	public function __set($name, $value)

	{

		return ObjectMixin::set($this, $name, $value);

	}







	/**

	 * Is property defined?

	 *

	 * @param  string  property name

	 * @return bool

	 */

	public function __isset($name)

	{

		return ObjectMixin::has($this, $name);

	}







	/**

	 * Access to undeclared property.

	 *

	 * @throws MemberAccessException

	 */

	public function __unset($name)

	{

		throw new MemberAccessException("Cannot unset the property {$this->reflection->name}::\$$name.");

	}







	/********************* Nette\FreezableObject behaviour ****************d*g**/







	/**

	 * Makes the object unmodifiable.

	 * @return void

	 */

	public function freeze()

	{

		$this->frozen = TRUE;

	}







	/**

	 * Is the object unmodifiable?

	 * @return bool

	 */

	final public function isFrozen()

	{

		return $this->frozen;

	}







	/**

	 * Creates a modifiable clone of the object.

	 * @return void

	 */

	public function __clone()

	{

		$this->frozen = FALSE;

	}







	/**

	 * @return void

	 */

	protected function updating()

	{

		if ($this->frozen) {

			$class = get_class($this);

			throw new InvalidStateException("Cannot modify a frozen object '$class'.");

		}

	}



}