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<?php
namespace Alpha\View\Widget;
use Alpha\Util\Logging\Logger;
use Alpha\Util\Config\ConfigProvider;
use Alpha\Util\Service\ServiceFactory;
use Alpha\Model\Tag;
/**
* A widget for rendering a tag cloud, based off the Tag instances in the
* database.
*
* @since 1.0
*
* @author John Collins <dev@alphaframework.org>
* @license http://www.opensource.org/licenses/bsd-license.php The BSD License
* @copyright Copyright (c) 2018, John Collins (founder of Alpha Framework).
* All rights reserved.
*
* <pre>
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the
* following conditions are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
* * Neither the name of the Alpha Framework nor the names
* of its contributors may be used to endorse or promote
* products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* </pre>
*/
class TagCloud
{
/**
* Trace logger.
*
* @var \Alpha\Util\Logging\Logger
*
* @since 1.0
*/
private static $logger = null;
/**
* A hash array of popular tags.
*
* @var array
*
* @since 1.0
*/
private $popTags = array();
/**
* Constructor.
*
* @param $limit The maximum amount of tags to include in the cloud.
* @param $cacheKey Set this optional value to attempt to store the tag cloud array in the available cache for 24hrs (cache.provider.name).
*
* @since 1.0
*/
public function __construct($limit, $cacheKey = '')
{
$config = ConfigProvider::getInstance();
self::$logger = new Logger('TagCloud');
if ($cacheKey != '' && $config->get('cache.provider.name') != '') {
$cache = ServiceFactory::getInstance($config->get('cache.provider.name'), 'Alpha\Util\Cache\CacheProviderInterface');
$this->popTags = $cache->get($cacheKey);
// cache look-up failed, so add it for the next time
if (!$this->popTags) {
self::$logger->debug('Cache lookup on the key ['.$cacheKey.'] failed, regenerating popular tags...');
$this->popTags = Tag::getPopularTagsArray($limit);
$cache->set($cacheKey, $this->popTags, 86400);
} else {
$this->popTags = array_slice($this->popTags, 0, $limit);
self::$logger->debug('Cache lookup on the key ['.$cacheKey.'] succeeded');
}
} else {
$this->popTags = Tag::getPopularTagsArray($limit);
}
}
/**
* Render the tag cloud and return all of the HTML links in a single paragraph.
*
* @param $minLinkSize The minimum font size for any tag link, in points.
* @param $maxLinkSize The maximum font size for any tag link, in points.
* @param $target The target attribute for the links
*
* @return string
*
* @since 1.0
*/
public function render($minLinkSize = 8, $maxLinkSize = 20, $target = '')
{
$config = ConfigProvider::getInstance();
$html = '<p>';
foreach (array_keys($this->popTags) as $key) {
$linkSize = $this->popTags[$key];
if ($linkSize < $minLinkSize) {
$linkSize = $minLinkSize;
}
if ($linkSize > $maxLinkSize) {
$linkSize = $maxLinkSize;
}
$html .= '<a href="'.$config->get('app.url').'/search/'.$key.'" style="font-size:'.$linkSize.'pt;"'.(empty($target) ? '' : ' target="'.$target.'"').' rel="tag">'.$key.'</a> ';
}
return $html.'</p>';
}
/**
* Get the array of popular tags.
*
* @return array
*
* @since 2.0.1
*/
public function getPopTags()
{
return $this->popTags;
}
}