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122 lines
3.6 KiB
122 lines
3.6 KiB
<?php
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/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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/**
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* A helper class for storing relations between objects, and mapping related objects.
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*/
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class CRelationMap {
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/**
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* A hash with IDs of base objects as keys and hashes of related object IDs as values.
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*
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* @var array
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*/
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protected $map = [];
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/**
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* A hash of related object IDs.
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*
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* @var array
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*/
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protected $relatedIds = [];
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/**
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* Adds a new relation.
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*
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* @param string $baseObjectId
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* @param string $relatedObjectId
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*/
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public function addRelation($baseObjectId, $relatedObjectId) {
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$this->map[$baseObjectId][$relatedObjectId] = $relatedObjectId;
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$this->relatedIds[$relatedObjectId] = $relatedObjectId;
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}
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/**
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* Returns the IDs of all related objects.
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*
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* @return array
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*/
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public function getRelatedIds() {
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return array_values($this->relatedIds);
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}
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/**
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* Maps multiple related objects to the base objects and adds them under the $name property. Each base object will
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* have an array of related objects.
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*
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* @param array $baseObjects a hash of base objects with IDs as keys
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* @param array $relatedObjects a hash of related objects with IDs as keys
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* @param string $name the name of the property under which the related objects will be added
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* @param int $limit maximum number of related objects for each base objects
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*
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* @return array
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*/
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public function mapMany(array $baseObjects, array $relatedObjects, $name, $limit = null) {
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foreach ($baseObjects as $baseObjectId => &$baseObject) {
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$baseObject[$name] = [];
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if (isset($this->map[$baseObjectId]) && $this->map[$baseObjectId]) {
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$matchingRelatedObjects = array_values(array_intersect_key($relatedObjects, $this->map[$baseObjectId]));
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if ($matchingRelatedObjects) {
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if ($limit) {
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$matchingRelatedObjects = array_slice($matchingRelatedObjects, 0, $limit);
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}
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$baseObject[$name] = $matchingRelatedObjects;
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}
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}
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}
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unset($baseObject);
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return $baseObjects;
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}
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/**
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* Maps multiple related objects to the base objects and adds them under the $name property.
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* Each base object will have only one related object.
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*
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* @param array $baseObjects a hash of base objects with IDs as keys
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* @param array $relatedObjects a hash of related objects with IDs as keys
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* @param string $name the name of the property under which the related object will be added
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*
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* @return array
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*/
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public function mapOne(array $baseObjects, array $relatedObjects, $name) {
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foreach ($baseObjects as $baseObjectId => &$baseObject) {
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$matchingRelatedObject = [];
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if (isset($this->map[$baseObjectId])) {
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$matchingRelatedId = reset($this->map[$baseObjectId]);
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if (isset($relatedObjects[$matchingRelatedId])) {
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$matchingRelatedObject = $relatedObjects[$matchingRelatedId];
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}
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}
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$baseObject[$name] = $matchingRelatedObject;
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}
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unset($baseObject);
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return $baseObjects;
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}
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}
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