silverstripe-blog/code/extensions/URLSegmentExtension.php

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<?php
/**
* Adds URLSegment functionality to Tags & Categories.
*
* @package silverstripe
* @subpackage blog
*/
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class URLSegmentExtension extends DataExtension
{
/**
* @var array
*/
private static $db = array(
'URLSegment' => 'Varchar(255)',
);
/**
* {@inheritdoc}
*/
public function onBeforeWrite()
{
$this->owner->generateURLSegment();
}
/**
* Generates a unique URLSegment from the title.
*
* @param int $increment
*
* @return string
*/
public function generateURLSegment($increment = null)
{
$filter = new URLSegmentFilter();
$this->owner->URLSegment = $filter->filter($this->owner->Title);
if (is_int($increment)) {
$this->owner->URLSegment .= '-' . $increment;
}
$duplicate = DataList::create($this->owner->ClassName)->filter(array(
'URLSegment' => $this->owner->URLSegment,
'BlogID' => $this->owner->BlogID,
));
if ($this->owner->ID) {
$duplicate = $duplicate->exclude('ID', $this->owner->ID);
}
if ($duplicate->count() > 0) {
if (is_int($increment)) {
$increment += 1;
} else {
$increment = 0;
}
$this->owner->generateURLSegment((int) $increment);
}
return $this->owner->URLSegment;
}
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}