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<?php |
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/** |
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* PHP: Nelson Martell Library file |
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* |
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* Copyright © 2015-2021 Nelson Martell (http://nelson6e65.github.io) |
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* |
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* Licensed under The MIT License (MIT) |
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* For full copyright and license information, please see the LICENSE |
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* Redistributions of files must retain the above copyright notice. |
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* |
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* @copyright 2015-2021 Nelson Martell |
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* @link http://nelson6e65.github.io/php_nml/ |
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* @since 0.4.0 |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License (MIT) |
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* */ |
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namespace NelsonMartell\Collections; |
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use OutOfRangeException; |
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use NelsonMartell\Extensions\Text; |
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use NelsonMartell\StrictObject; |
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use function NelsonMartell\typeof; |
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/** |
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* Clase base de una colección de objetos, que provee una implementación |
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* predeterminada de la interfaz ICollection. |
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* |
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* @author Nelson Martell <[email protected]> |
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* @since 0.4.0 |
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* |
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* @property-read int $count Obtiene el número de elementos incluidos en la colección. Esta propiedad es de sólo |
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* lectura. |
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* */ |
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class Collection extends StrictObject implements ICollection |
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{ |
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// Implementación de la interfaz Iterator. |
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use CollectionIterator; |
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public function __construct() |
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{ |
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parent::__construct(); |
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} |
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final public function __invoke($index, $value = null) |
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{ |
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if ($value == null) { |
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return $this->items[$index]; |
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} |
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$this->setItem($index, $value); |
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} |
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private $items = array(); |
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/** |
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* Inserta un nuevo elemento a la colección, en el índice especificado. |
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* |
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* @param int $index Índice del elemento a insertar. |
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* @param mixed $newItem Nuevo elemento a insertar a la colección. |
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* |
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* @return void |
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* */ |
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protected function insertItem($index, $newItem) |
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{ |
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if ($index > $this->count || $index < 0) { |
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throw new OutOfRangeException(); |
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} |
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if ($index == $this->count) { |
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$this->items[$index] = null; |
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$this->count++; |
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} |
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$this->items[$index] = $newItem; |
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} |
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/** |
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* Quita todos los elementos de la colección. |
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* |
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* @return void |
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* */ |
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protected function clearItems() |
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{ |
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$this->items = array(); |
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$this->count = 0; |
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} |
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/** |
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* Establece un elemento en el índice especificado. |
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* |
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* @param int $index Índice del elemento a establecer. |
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* @param mixed $newItem Nuevo valor con el que se va a reemplazar. |
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* |
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* @return void |
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* */ |
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protected function setItem($index, $newItem) |
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{ |
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if ($index >= $this->count || $index < 0) { |
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throw new OutOfRangeException(); |
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} |
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$this->items[$index] = $newItem; |
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} |
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/** |
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* Obtiene el elemento almacenado en el índice especificado. |
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* Este método no lanza excepción en caso de indicar un índice fuera del |
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* rango; en cambio, devuelve NULL. |
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* El elemento obtenido es de sólo lectura. Para modificar el elemento |
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* dentro de la colección, tendría que utilizarse el método |
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* Collection::setItem una vez modificado. |
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* |
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* @param int $index Índice del elemento a obtener. |
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* |
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* @return mixed |
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* */ |
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protected function getItem($index) |
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{ |
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if ($index >= $this->count || $index < 0) { |
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return null; |
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} |
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return $this->items[$index]; |
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} |
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/** |
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* Remove the item in specified index. |
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* |
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* @param int $index Index. |
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* |
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* @return void |
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*/ |
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protected function removeItem($index) |
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{ |
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if ($index >= $this->count || $index < 0) { |
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throw new OutOfRangeException(); |
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} |
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for ($i = $index; $i < $this->count - 1; $i++) { |
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$this->items[$i] = $this->items[$i + 1]; //Mueve los valores |
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} |
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unset($this->items[$this->count - 1]); //Des-asigna el último elemento |
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$this->count--; |
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} |
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/** |
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* Gets the string representation of this object collection. |
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* |
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* You can format the output, by setting $format param to one of this |
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* options: |
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* - `R` or `r`: All items, separated by comma and space (`, `). |
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* This is the default format. |
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* - `L` or `l`: Same as `r` option, but enclosed in braces (`{`, `}`). |
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* - `g`: A full string, containing class name, items count and items |
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* list (this list, like `L` option). |
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* - `G`: Same as `g`, but using a full class name (including namespace). |
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* |
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* You can also use a custom format instead, using this placeholders: |
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* - `{class}`: Short class name (without namespace part); |
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* - `{nsclass}`: Full class name (included namespace); |
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* - `{count}`: Items count; and |
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* - `{items}`: List of items, using comma and space (`, `) as separator. |
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* |
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* Example: For a instance with 10 elements (numbers: 1-10), using: |
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* `Collection::ToString('My collection ({count} items): { {items} }');` |
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* Result: 'My collection (10 items): { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }' |
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* |
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* @param string $format String format (optional). By default, `r`. |
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* |
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* @return string |
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* @see Text::format() |
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* */ |
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public function toString($format = 'r') |
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{ |
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static $defaultFormats = [ |
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'r' => '{items}', |
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'l' => '{ {items} }', |
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'g' => '{class} ({count} items): { {items} }', |
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'G' => '{nsclass} ({count} items): { {items} }', |
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]; |
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if ($format == null || !is_string($format)) { |
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$format = 'r'; //Override if is not an string |
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} |
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$str = ''; |
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switch ($format) { |
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case 'r': |
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case 'l': |
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case 'g': |
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case 'G': |
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$str = $defaultFormats[$format]; |
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break; |
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default: |
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$str = $format; |
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} |
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$t = typeof($this); |
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$items = implode(', ', $this->items); |
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$placeHoldersValues = [ |
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'class' => $t->shortName, |
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'nsclass' => $t->name, |
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'count' => $this->count, |
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'items' => $items, |
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]; |
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$s = Text::format($str, $placeHoldersValues); |
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return $s; |
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} |
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private $count = 0; |
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/** |
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* Getter for $count property. |
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* |
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* @return int |
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* */ |
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public function getCount() |
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{ |
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return $this->count; |
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} |
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/** |
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* Agrega un nuevo elemento al final de la colección. |
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* Nota para herederos: Para cambiar el comportamiento de este método, |
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* reemplazar más bien el método protegido 'insertItem'. |
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* |
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* @param mixed $item Elemento que se va a agregar a la colección. |
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* |
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* @return void |
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* */ |
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public function add($item) |
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{ |
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$this->insertItem($this->count, $item); |
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} |
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/** |
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* Quita todos los elementos de la colección. |
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* Nota para herederos: Para cambiar el comportamiento de este método, |
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* reemplazar más bien el método protegido `Collection::clearItems`. |
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* |
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* @return void |
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* @see Collection::clearItems() |
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* */ |
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public function clear() |
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{ |
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$this->clearItems(); |
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} |
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/** |
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* Determina si la colección contiene al elemento especificado. |
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* |
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* @param mixed $item Objeto que se va a buscar. |
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* |
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* @return bool `true` si $item se encuentra; en caso contrario, `false`. |
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* */ |
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public function contains($item) |
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{ |
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foreach ($this->items as $i) { |
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if ($item === $i) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Quita, si existe, la primera aparición de un objeto específico de la |
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* colección. |
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* |
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* @param mixed $item Objeto que se va a quitar. |
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* |
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* @return bool `true` si el elemento se ha quitado correctamente; en |
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* caso contrario, `false`. Este método también devuelve `false` si no |
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* se encontró. |
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* */ |
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public function remove($item) |
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{ |
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for ($i = 0; $i < $this->count; $i++) { |
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if ($this->items[$i] === $item) { |
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$this->removeItem($i); |
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} |
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} |
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return false; |
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} |
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} |
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