Java Action to detect browser wont compile on v7

I have a java action that detects the users browser that works fine on v5, however won't compile on v7. Can anyone help, either with a fix or an alternative for detecting the browser please? java action and compile error below.

Many Thanks,

Simon.

JAVA ACTION

// This file was generated by Mendix Modeler.
//
// WARNING: Only the following code will be retained when actions are regenerated:
// - the import list
// - the code between BEGIN USER CODE and END USER CODE
// - the code between BEGIN EXTRA CODE and END EXTRA CODE
// Other code you write will be lost the next time you deploy the project.
// Special characters, e.g., é, ö, à, etc. are supported in comments.

package administration.actions;

import net.sf.uadetector.ReadableUserAgent;
import net.sf.uadetector.UserAgentStringParser;
import net.sf.uadetector.service.UADetectorServiceFactory;
import com.mendix.systemwideinterfaces.core.IContext;
import com.mendix.webui.CustomJavaAction;

/**
 * Returns information about the Browser
 */
public class GetBrowserInfo_Test extends CustomJavaAction<java.lang.String>
{
    public GetBrowserInfo_Test(IContext context)
    {
        super(context);
    }

    @Override
    public java.lang.String executeAction() throws Exception
    {
        // BEGIN USER CODE
        UserAgentStringParser parser = UADetectorServiceFactory.getResourceModuleParser();
        ReadableUserAgent agent = parser.parse(request.getHeader("User-Agent"));
        return agent.getName();
        // END USER CODE
    }

    /**
     * Returns a string representation of this action
     */
    @Override
    public java.lang.String toString()
    {
        return "GetBrowserInfo_Test";
    }

    // BEGIN EXTRA CODE
    // END EXTRA CODE
}

COMPILE ERROR

    [javac] Compiling 43 source files to C:\Scratch\Mendix\GetBrowserInfo_Test-main\deployment\run\bin
    [javac] C:\Scratch\Mendix\GetBrowserInfo_Test-main\javasource\administration\actions\GetBrowserInfo_Test.java:34: error: cannot find symbol
    [javac]         String userAgent = currentRequest.getHeader("User-Agent");
    [javac]                            ^
    [javac]   symbol:   variable currentRequest
    [javac]   location: class GetBrowserInfo_Test
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] 1 error