mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
211 lines
5.7 KiB
PHP
211 lines
5.7 KiB
PHP
<?php
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namespace SilverStripe\ORM;
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use Iterator;
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use SilverStripe\Dev\Deprecation;
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/**
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* Builds a map iterator around an Iterator. Called by Map
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*
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* @deprecated 4.13.0 Will be removed without equivalent functionality to replace it
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*/
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class Map_Iterator implements Iterator
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{
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/**
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* @var Iterator
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**/
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protected $items;
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protected $keyField, $titleField;
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protected $firstItemIdx = 0;
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protected $endItemIdx;
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protected $firstItems = [];
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protected $lastItems = [];
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protected $excludedItems = [];
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/**
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* @param Iterator $items The iterator to build this map from
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* @param string $keyField The field to use for the keys
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* @param string $titleField The field to use for the values
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* @param array $firstItems An optional map of items to show first
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* @param array $lastItems An optional map of items to show last
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*/
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public function __construct(Iterator $items, $keyField, $titleField, $firstItems = null, $lastItems = null)
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{
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Deprecation::withNoReplacement(function () {
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Deprecation::notice(
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'4.13.0',
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'Will be removed without equivalent functionality to replace it',
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Deprecation::SCOPE_CLASS
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);
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});
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$this->items = $items;
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$this->keyField = $keyField;
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$this->titleField = $titleField;
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$this->endItemIdx = null;
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if ($firstItems) {
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foreach ($firstItems as $k => $v) {
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$this->firstItems[] = [$k, $v];
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$this->excludedItems[] = $k;
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}
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}
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if ($lastItems) {
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foreach ($lastItems as $k => $v) {
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$this->lastItems[] = [$k, $v];
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$this->excludedItems[] = $k;
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}
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}
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}
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/**
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* Rewind the Iterator to the first element.
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*
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* @return mixed
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*/
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#[\ReturnTypeWillChange]
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public function rewind()
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{
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$this->firstItemIdx = 0;
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$this->endItemIdx = null;
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$rewoundItem = $this->items->rewind();
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if (isset($this->firstItems[$this->firstItemIdx])) {
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return $this->firstItems[$this->firstItemIdx][1];
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} else {
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if ($rewoundItem) {
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return $this->extractValue($rewoundItem, $this->titleField);
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} else {
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if (!$this->items->valid() && $this->lastItems) {
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$this->endItemIdx = 0;
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return $this->lastItems[0][1];
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}
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}
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}
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}
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/**
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* Return the current element.
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*
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* @return mixed
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*/
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#[\ReturnTypeWillChange]
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public function current()
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{
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if (($this->endItemIdx !== null) && isset($this->lastItems[$this->endItemIdx])) {
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return $this->lastItems[$this->endItemIdx][1];
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} else {
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if (isset($this->firstItems[$this->firstItemIdx])) {
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return $this->firstItems[$this->firstItemIdx][1];
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}
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}
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return $this->extractValue($this->items->current(), $this->titleField);
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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, $key)
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{
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if (is_object($item)) {
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if (method_exists($item, 'hasMethod') && $item->hasMethod($key)) {
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return $item->{$key}();
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}
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return $item->{$key};
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} else {
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if (array_key_exists($key, $item ?? [])) {
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return $item[$key];
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}
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}
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}
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/**
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* Return the key of the current element.
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*
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* @return string
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*/
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#[\ReturnTypeWillChange]
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public function key()
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{
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if (($this->endItemIdx !== null) && isset($this->lastItems[$this->endItemIdx])) {
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return $this->lastItems[$this->endItemIdx][0];
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} else {
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if (isset($this->firstItems[$this->firstItemIdx])) {
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return $this->firstItems[$this->firstItemIdx][0];
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} else {
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return $this->extractValue($this->items->current(), $this->keyField);
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}
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}
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}
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/**
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* Move forward to next element.
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*
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* @return mixed
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*/
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#[\ReturnTypeWillChange]
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public function next()
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{
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$this->firstItemIdx++;
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if (isset($this->firstItems[$this->firstItemIdx])) {
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return $this->firstItems[$this->firstItemIdx][1];
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} else {
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if (!isset($this->firstItems[$this->firstItemIdx - 1])) {
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$this->items->next();
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}
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if ($this->excludedItems) {
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while (($c = $this->items->current()) && in_array($c->{$this->keyField}, $this->excludedItems ?? [], true)) {
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$this->items->next();
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}
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}
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}
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if (!$this->items->valid()) {
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// iterator has passed the preface items, off the end of the items
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// list. Track through the end items to go through to the next
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if ($this->endItemIdx === null) {
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$this->endItemIdx = -1;
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}
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$this->endItemIdx++;
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if (isset($this->lastItems[$this->endItemIdx])) {
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return $this->lastItems[$this->endItemIdx];
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}
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return false;
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}
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}
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/**
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* Checks if current position is valid.
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*
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* @return boolean
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*/
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#[\ReturnTypeWillChange]
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public function valid()
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{
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return (
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(isset($this->firstItems[$this->firstItemIdx])) ||
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(($this->endItemIdx !== null) && isset($this->lastItems[$this->endItemIdx])) ||
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$this->items->valid()
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);
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}
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}
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