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<?php
/*
** Zabbix
** Copyright (C) 2001-2019 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
/**
* A helper class for storing relations between objects, and mapping related objects.
*/
class CRelationMap {
/**
* A hash with IDs of base objects as keys and hashes of related object IDs as values.
*
* @var array
*/
protected $map = [];
/**
* A hash of related object IDs.
*
* @var array
*/
protected $relatedIds = [];
/**
* Adds a new relation.
*
* @param string $baseObjectId
* @param string $relatedObjectId
*/
public function addRelation($baseObjectId, $relatedObjectId) {
$this->map[$baseObjectId][$relatedObjectId] = $relatedObjectId;
$this->relatedIds[$relatedObjectId] = $relatedObjectId;
}
/**
* Returns the IDs of all related objects.
*
* @return array
*/
public function getRelatedIds() {
return array_values($this->relatedIds);
}
/**
* Maps multiple related objects to the base objects and adds them under the $name property. Each base object will
* have an array of related objects.
*
* @param array $baseObjects a hash of base objects with IDs as keys
* @param array $relatedObjects a hash of related objects with IDs as keys
* @param string $name the name of the property under which the related objects will be added
* @param int $limit maximum number of related objects for each base objects
*
* @return array
*/
public function mapMany(array $baseObjects, array $relatedObjects, $name, $limit = null) {
foreach ($baseObjects as $baseObjectId => &$baseObject) {
$baseObject[$name] = [];
if (isset($this->map[$baseObjectId]) && $this->map[$baseObjectId]) {
$matchingRelatedObjects = array_values(array_intersect_key($relatedObjects, $this->map[$baseObjectId]));
if ($matchingRelatedObjects) {
if ($limit) {
$matchingRelatedObjects = array_slice($matchingRelatedObjects, 0, $limit);
}
$baseObject[$name] = $matchingRelatedObjects;
}
}
}
unset($baseObject);
return $baseObjects;
}
/**
* Maps multiple related objects to the base objects and adds them under the $name property.
* Each base object will have only one related object.
*
* @param array $baseObjects a hash of base objects with IDs as keys
* @param array $relatedObjects a hash of related objects with IDs as keys
* @param string $name the name of the property under which the related object will be added
*
* @return array
*/
public function mapOne(array $baseObjects, array $relatedObjects, $name) {
foreach ($baseObjects as $baseObjectId => &$baseObject) {
$matchingRelatedObject = [];
if (isset($this->map[$baseObjectId])) {
$matchingRelatedId = reset($this->map[$baseObjectId]);
if (isset($relatedObjects[$matchingRelatedId])) {
$matchingRelatedObject = $relatedObjects[$matchingRelatedId];
}
}
$baseObject[$name] = $matchingRelatedObject;
}
unset($baseObject);
return $baseObjects;
}
}
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