mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-06-29 07:59:31 +02:00
1ed41b8d67
ArrayList had several methods that should act on a copy and return that copy, but was instead mutating the existing list. We cant change this behaviour in the 3.0 line for backwards compt. reasons, but this makes the desired behavior the default, and makes disabling the mutation in 3.1 easier
558 lines
14 KiB
PHP
558 lines
14 KiB
PHP
<?php
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/**
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* A list object that wraps around an array of objects or arrays.
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*
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* @package framework
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* @subpackage model
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*/
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class ArrayList extends ViewableData implements SS_List, SS_Filterable, SS_Sortable, SS_Limitable {
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/**
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* Holds the items in the list
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*
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* @var array
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*/
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protected $items;
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/**
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*
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* @param array $items - an initial array to fill this object with
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*/
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public function __construct(array $items = array()) {
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$this->items = $items;
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parent::__construct();
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}
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/**
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* Return the class of items in this list, by looking at the first item inside it.
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*/
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function dataClass() {
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if(count($this->items) > 0) return get_class($this->items[0]);
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}
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/**
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* Return the number of items in this list
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*
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* @return int
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*/
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public function count() {
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return count($this->items);
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}
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/**
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* Returns true if this list has items
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*
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* @return bool
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*/
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public function exists() {
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return (bool) count($this);
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}
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/**
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* Returns an Iterator for this ArrayList.
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* This function allows you to use ArrayList in foreach loops
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*
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* @return ArrayIterator
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*/
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public function getIterator() {
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return new ArrayIterator($this->items);
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}
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/**
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* Return an array of the actual items that this ArrayList contains.
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*
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* @return array
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*/
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public function toArray() {
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return $this->items;
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}
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public function debug() {
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$val = "<h2>" . $this->class . "</h2><ul>";
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foreach($this->toNestedArray() as $item) {
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$val .= "<li style=\"list-style-type: disc; margin-left: 20px\">" . Debug::text($item) . "</li>";
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}
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$val .= "</ul>";
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return $val;
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}
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/**
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* Return this list as an array and every object it as an sub array as well
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*
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* @return array
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*/
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public function toNestedArray() {
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$result = array();
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foreach ($this->items as $item) {
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if (is_object($item)) {
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if (method_exists($item, 'toMap')) {
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$result[] = $item->toMap();
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} else {
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$result[] = (array) $item;
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}
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} else {
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$result[] = $item;
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}
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}
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return $result;
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}
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/**
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* Get a sub-range of this dataobjectset as an array
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*
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* @param int $offset
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* @param int $length
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* @return ArrayList
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*/
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public function getRange($offset, $length) {
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Deprecation::notice("3.0", 'getRange($offset, $length) is deprecated. Use limit($length, $offset) instead. Note the new argument order.');
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return $this->limit($length, $offset);
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}
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/**
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* Get a sub-range of this dataobjectset as an array
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*
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* @param int $offset
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* @param int $length
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* @return ArrayList
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*/
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public function limit($length, $offset = 0) {
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return new ArrayList(array_slice($this->items, $offset, $length));
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}
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/**
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* Add this $item into this list
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*
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* @param mixed $item
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*/
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public function add($item) {
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$this->push($item);
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}
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/**
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* Remove this item from this list
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*
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* @param mixed $item
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*/
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public function remove($item) {
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foreach ($this->items as $key => $value) {
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if ($item === $value) unset($this->items[$key]);
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}
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}
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/**
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* Replaces an item in this list with another item.
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*
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* @param array|object $item
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* @param array|object $with
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* @return void;
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*/
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public function replace($item, $with) {
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foreach ($this->items as $key => $candidate) {
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if ($candidate === $item) {
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$this->items[$key] = $with;
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return;
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}
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}
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}
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/**
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* Merges with another array or list by pushing all the items in it onto the
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* end of this list.
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*
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* @param array|object $with
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*/
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public function merge($with) {
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foreach ($with as $item) $this->push($item);
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}
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/**
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* Removes items from this list which have a duplicate value for a certain
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* field. This is especially useful when combining lists.
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*
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* @param string $field
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*/
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public function removeDuplicates($field = 'ID') {
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$seen = array();
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foreach ($this->items as $key => $item) {
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$value = $this->extractValue($item, $field);
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if (array_key_exists($value, $seen)) {
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unset($this->items[$key]);
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}
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$seen[$value] = true;
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}
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}
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/**
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* Pushes an item onto the end of this list.
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*
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* @param array|object $item
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*/
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public function push($item) {
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$this->items[] = $item;
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}
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/**
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* Pops the last element off the end of the list and returns it.
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*
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* @return array|object
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*/
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public function pop() {
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return array_pop($this->items);
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}
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/**
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* Add an item onto the beginning of the list.
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*
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* @param array|object $item
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*/
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public function unshift($item) {
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array_unshift($this->items, $item);
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}
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/**
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* Shifts the item off the beginning of the list and returns it.
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*
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* @return array|object
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*/
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public function shift() {
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return array_shift($this->items);
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}
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/**
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* Returns the first item in the list
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*
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* @return mixed
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*/
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public function first() {
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return reset($this->items);
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}
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/**
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* Returns the last item in the list
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*
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* @return mixed
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*/
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public function last() {
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return end($this->items);
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}
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/**
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* Returns a map of this list
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*
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* @param type $keyfield - the 'key' field of the result array
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* @param type $titlefield - the value field of the result array
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* @return array
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*/
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public function map($keyfield = 'ID', $titlefield = 'Title') {
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$map = array();
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foreach ($this->items as $item) {
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$map[$this->extractValue($item, $keyfield)] = $this->extractValue($item, $titlefield);
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}
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return $map;
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}
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/**
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* Find the first item of this list where the given key = value
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*
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* @param type $key
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* @param type $value
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* @return type
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*/
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public function find($key, $value) {
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foreach ($this->items as $item) {
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if ($this->extractValue($item, $key) == $value) return $item;
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}
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}
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/**
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* Returns an array of a single field value for all items in the list.
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*
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* @param string $colName
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* @return array
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*/
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public function column($colName = 'ID') {
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$result = array();
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foreach ($this->items as $item) {
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$result[] = $this->extractValue($item, $colName);
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}
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return $result;
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}
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/**
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* You can always sort a ArrayList
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*
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* @param string $by
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* @return bool
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*/
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public function canSortBy($by) {
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return true;
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}
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/**
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* Reverses an {@link ArrayList}
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*
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* @return ArrayList
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*/
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public function reverse() {
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// TODO 3.1: This currently mutates existing array
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$list = /* clone */ $this;
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$list->items = array_reverse($this->items);
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return $list;
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}
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/**
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* Sorts this list by one or more fields. You can either pass in a single
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* field name and direction, or a map of field names to sort directions.
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*
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* @return DataList
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* @see SS_List::sort()
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* @example $list->sort('Name'); // default ASC sorting
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* @example $list->sort('Name DESC'); // DESC sorting
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* @example $list->sort('Name', 'ASC');
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* @example $list->sort(array('Name'=>'ASC,'Age'=>'DESC'));
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*/
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public function sort() {
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$args = func_get_args();
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if(count($args)==0){
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return $this;
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}
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if(count($args)>2){
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throw new InvalidArgumentException('This method takes zero, one or two arguments');
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}
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// One argument and it's a string
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if(count($args)==1 && is_string($args[0])){
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$column = $args[0];
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if(strpos($column, ' ') !== false) throw new InvalidArgumentException("You can't pass SQL fragments to sort()");
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$columnsToSort[$column] = SORT_ASC;
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} else if(count($args)==2){
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$columnsToSort[$args[0]]=(strtolower($args[1])=='desc')?SORT_DESC:SORT_ASC;
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} else if(is_array($args[0])) {
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foreach($args[0] as $column => $sort_order){
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$columnsToSort[$column] = (strtolower($sort_order)=='desc')?SORT_DESC:SORT_ASC;
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}
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} else {
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throw new InvalidArgumentException("Bad arguments passed to sort()");
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}
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// This the main sorting algorithm that supports infinite sorting params
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$multisortArgs = array();
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$values = array();
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foreach($columnsToSort as $column => $direction ) {
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// The reason these are added to columns is of the references, otherwise when the foreach
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// is done, all $values and $direction look the same
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$values[$column] = array();
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$sortDirection[$column] = $direction;
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// We need to subtract every value into a temporary array for sorting
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foreach($this->items as $index => $item) {
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$values[$column][] = $this->extractValue($item, $column);
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}
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// PHP 5.3 requires below arguments to be reference when using array_multisort together
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// with call_user_func_array
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// First argument is the 'value' array to be sorted
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$multisortArgs[] = &$values[$column];
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// First argument is the direction to be sorted,
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$multisortArgs[] = &$sortDirection[$column];
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}
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// TODO 3.1: This currently mutates existing array
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$list = /* clone */ $this;
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// As the last argument we pass in a reference to the items that all the sorting will be applied upon
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$multisortArgs[] = &$list->items;
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call_user_func_array('array_multisort', $multisortArgs);
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return $list;
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}
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/**
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* Returns true if the given column can be used to filter the records.
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*
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* It works by checking the fields available in the first record of the list.
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*/
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public function canFilterBy($by) {
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return array_key_exists($by, $this->first());
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}
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/**
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* Filter the list to include items with these charactaristics
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*
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* @return ArrayList
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* @see SS_List::filter()
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* @example $list->filter('Name', 'bob'); // only bob in the list
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* @example $list->filter('Name', array('aziz', 'bob'); // aziz and bob in list
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* @example $list->filter(array('Name'=>'bob, 'Age'=>21)); // bob with the Age 21 in list
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* @example $list->filter(array('Name'=>'bob, 'Age'=>array(21, 43))); // bob with the Age 21 or 43
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* @example $list->filter(array('Name'=>array('aziz','bob'), 'Age'=>array(21, 43))); // aziz with the age 21 or 43 and bob with the Age 21 or 43
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*/
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public function filter() {
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if(count(func_get_args())>2){
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throw new InvalidArgumentException('filter takes one array or two arguments');
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}
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if(count(func_get_args()) == 1 && !is_array(func_get_arg(0))){
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throw new InvalidArgumentException('filter takes one array or two arguments');
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}
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$keepUs = array();
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if(count(func_get_args())==2){
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$keepUs[func_get_arg(0)] = func_get_arg(1);
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}
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if(count(func_get_args())==1 && is_array(func_get_arg(0))){
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foreach(func_get_arg(0) as $column => $value) {
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$keepUs[$column] = $value;
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}
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}
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$itemsToKeep = array();
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foreach($this->items as $item){
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$keepItem = true;
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foreach($keepUs as $column => $value ) {
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if(is_array($value) && !in_array($this->extractValue($item, $column), $value)) {
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$keepItem = false;
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} elseif(!is_array($value) && $this->extractValue($item, $column) != $value) {
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$keepItem = false;
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}
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}
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if($keepItem) {
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$itemsToKeep[] = $item;
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}
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}
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// TODO 3.1: This currently mutates existing array
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$list = /* clone */ $this;
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$list->items = $itemsToKeep;
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return $list;
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}
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public function byID($id) {
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return $this->filter("ID", $id)->First();
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}
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/**
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* Exclude the list to not contain items with these charactaristics
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*
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* @return ArrayList
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* @see SS_List::exclude()
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* @example $list->exclude('Name', 'bob'); // exclude bob from list
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* @example $list->exclude('Name', array('aziz', 'bob'); // exclude aziz and bob from list
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* @example $list->exclude(array('Name'=>'bob, 'Age'=>21)); // exclude bob that has Age 21
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* @example $list->exclude(array('Name'=>'bob, 'Age'=>array(21, 43))); // exclude bob with Age 21 or 43
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* @example $list->exclude(array('Name'=>array('bob','phil'), 'Age'=>array(21, 43))); // bob age 21 or 43, phil age 21 or 43 would be excluded
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*/
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public function exclude() {
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if(count(func_get_args())>2){
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throw new InvalidArgumentException('exclude() takes one array or two arguments');
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}
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if(count(func_get_args()) == 1 && !is_array(func_get_arg(0))){
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throw new InvalidArgumentException('exclude() takes one array or two arguments');
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}
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$removeUs = array();
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if(count(func_get_args())==2){
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$removeUs[func_get_arg(0)] = func_get_arg(1);
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}
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if(count(func_get_args())==1 && is_array(func_get_arg(0))){
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foreach(func_get_arg(0) as $column => $excludeValue) {
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$removeUs[$column] = $excludeValue;
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}
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}
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$itemsToKeep = array();
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$hitsRequiredToRemove = count($removeUs);
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$matches = array();
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foreach($removeUs as $column => $excludeValue) {
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foreach($this->items as $key => $item){
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if(!is_array($excludeValue) && $this->extractValue($item, $column) == $excludeValue) {
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$matches[$key]=isset($matches[$key])?$matches[$key]+1:1;
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} elseif(is_array($excludeValue) && in_array($this->extractValue($item, $column), $excludeValue)) {
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$matches[$key]=isset($matches[$key])?$matches[$key]+1:1;
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}
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}
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}
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$keysToRemove = array_keys($matches,$hitsRequiredToRemove);
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// TODO 3.1: This currently mutates existing array
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$list = /* clone */ $this;
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foreach($keysToRemove as $itemToRemoveIdx){
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$list->remove($this->items[$itemToRemoveIdx]);
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}
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return $list;
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}
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protected function shouldExclude($item, $args) {
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}
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/**
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* Returns whether an item with $key exists
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*
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* @param mixed $key
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* @return bool
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*/
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public function offsetExists($offset) {
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return array_key_exists($offset, $this->items);
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}
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/**
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* Returns item stored in list with index $key
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*
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* @param mixed $key
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* @return DataObject
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*/
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public function offsetGet($offset) {
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if ($this->offsetExists($offset)) return $this->items[$offset];
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}
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/**
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* Set an item with the key in $key
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*
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* @param mixed $key
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* @param mixed $value
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*/
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public function offsetSet($offset, $value) {
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$this->items[$offset] = $value;
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}
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/**
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* Unset an item with the key in $key
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*
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* @param mixed $key
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*/
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public function offsetUnset($offset) {
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unset($this->items[$offset]);
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}
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/**
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* Extracts a value from an item in the list, where the item is either an
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* object or array.
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*
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* @param array|object $item
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* @param string $key
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* @return mixed
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*/
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protected function extractValue($item, $key) {
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if (is_object($item)) {
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return $item->$key;
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} else {
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if (array_key_exists($key, $item)) return $item[$key];
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}
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}
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}
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