public static function parse($locatorString)
{
if (substr($locatorString, 0, 6) != 'crl://' && preg_match('~^([a-zA-Z0-9]+\\://|[a-zA-Z0-9]+\\:)~', $locatorString)) {
return new ExternalResourceLocator($locatorString);
}
$matches = array();
$locatorString = rtrim($locatorString, '/');
if (preg_match('~^crl://claroline\\.net/(\\w+)/(\\w+)$~', $locatorString, $matches)) {
// course
$locator = new self($matches[2]);
$locator->setPlatformId($matches[1]);
} elseif (preg_match('~^crl://claroline\\.net/(\\w+)/(\\w+)/groups$~', $locatorString, $matches)) {
// course and group
$locator = new self($matches[2], 'CLGRP', null, null);
$locator->setPlatformId($matches[1]);
} elseif (preg_match('~^crl://claroline\\.net/(\\w+)/(\\w+)/groups/(\\d+)$~', $locatorString, $matches)) {
// course and group
$locator = new self($matches[2], null, null, $matches[3]);
$locator->setPlatformId($matches[1]);
} elseif (preg_match('~^crl://claroline\\.net/(\\w+)/(\\w+)/groups/(\\d+)/(\\w+)$~', $locatorString, $matches)) {
// course, group and tool
$locator = new self($matches[2], $matches[4], null, $matches[3]);
$locator->setPlatformId($matches[1]);
} elseif (preg_match('~^crl://claroline\\.net/(\\w+)/(\\w+)/groups/(\\d+)/(\\w+)/(.+)$~', $locatorString, $matches)) {
// course, group, tool and resource
$locator = new self($matches[2], $matches[4], $matches[5], $matches[3]);
$locator->setPlatformId($matches[1]);
} elseif (preg_match('~^crl://claroline\\.net/(\\w+)/(\\w+)/(\\w+)/(.+)$~', $locatorString, $matches)) {
// course, tool and resource
$locator = new self($matches[2], $matches[3], $matches[4]);
$locator->setPlatformId($matches[1]);
} elseif (preg_match('~^crl://claroline\\.net/(\\w+)/(\\w+)/(.+)$~', $locatorString, $matches)) {
// a course and a tool
$locator = new self($matches[2], $matches[3]);
$locator->setPlatformId($matches[1]);
} elseif (preg_match('~^crl://claroline\\.net/(\\w+)$~', $locatorString, $matches)) {
// the platform itself
$locator = new self();
$locator->setPlatformId($matches[1]);
} else {
// ???? error ????
throw new Exception("Invalid Resource Locator {$locatorString}");
}
return $locator;
}
