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81 lines
2.4 KiB
81 lines
2.4 KiB
<?php
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/** @license MIT
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* Copyright 2018 J. King et al.
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* See LICENSE and AUTHORS files for details */
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declare(strict_types=1);
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namespace JKingWeb\Lax;
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abstract class Collection implements \IteratorAggregate, \ArrayAccess, \Countable, \JsonSerializable {
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protected $data = [];
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/** Implementation for IteratorAggregate */
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public function getIterator(): \Traversable {
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return ($this->data instanceof \Traversable) ? $this->data : new \ArrayIterator((array) $this->data);
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}
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/** Implementation for JsonSerializable */
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public function jsonSerialize() {
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return $this->data;
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}
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/** Implementation for Countable */
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public function count(): int {
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return count($this->data);
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}
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/** Implementation for ArrayAccess */
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public function offsetExists($offset): bool {
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return isset($this->data[$offset]);
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}
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/** Implementation for ArrayAccess */
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public function offsetGet($offset) {
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return $this->data[$offset];
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}
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/** Implementation for ArrayAccess */
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public function offsetSet($offset, $value) {
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if (is_null($offset)) {
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$this->data[] = $value;
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} else {
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$this->data[$offset] = $value;
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}
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}
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/** Implementation for ArrayAccess */
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public function offsetUnset($offset) {
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unset($this->data[$offset]);
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}
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/** Merges one or more other collections' items into this one
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*
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* The returned collection is the original instance, modified
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*/
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public function merge(Collection ...$coll): self {
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foreach ($coll as $c) {
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foreach ($c as $p) {
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$this[] = $p;
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}
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}
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return $this;
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}
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/** Returns a collection filtered along a given axis which includes or excludes only the specified terms
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*
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* $terms is the list of values to include or exclude in the result
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*
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* $axis is the property of each collection member which value is to be checked against the terms
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*
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* $inclusive specified whether the terms are to included in (true) or excluded from (false) the result
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*/
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protected function filter(array $terms, string $axis, bool $inclusive): self {
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$out = new static;
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foreach ($this as $item) {
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if (in_array($item->$axis, $terms) == $inclusive) {
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$out[] = $item;
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}
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}
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return $out;
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}
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}
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