Tapestry 5 service to determine User Agent of common browsers. Can easily be expanded upon to include mobile browsers, etc.

UserAgent

This is a Tapestry 5 service to query a browser's User Agent.

Inject it into your page when you need to do browser-specific
customizations.  Make it a property and you can query via TML.

Add to AppModule.java to make the service available:

public static void bind(ServiceBinder binder)
{
    ...
        binder.bind(UserAgent.class, UserAgentImpl.class);
    ...
}

Then in a Java component/page:

@Inject
@Property
private UserAgent userAgent;


And in the corresponding TML component/page:

<t:if t:test="userAgent.IE6">
  Do something IE6-specific here.
</t:if>

UserAgent.java

Put this in your Tapestry src/main/java/.../services folder:

public interface UserAgent
{
    String getUserAgent();

    boolean isIE();      // Any version of IE.
    boolean isIE6();     // Any version of IE 6.
    boolean isIE7();     // Any version of IE 7.
    boolean isIE8();     // Any version of IE 8.
    boolean isIE9();     // Any version of IE 9.
    boolean isBadIE();   // Any version of IE 6, 7, or 8.
    boolean isChrome();  // Any version of Chrome.
    boolean isFirefox(); // Any version of Firefox.
    boolean isSafari();  // Any version of Safari.
}

UserAgentImpl.java

Put this in your Tapestry src/main/java/.../services folder (or sub-folder):

import ....services.UserAgent;

import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.services.Request;

// Modified from https://gist.github.com/bryanjswift/318237 which contains many more options.
public class UserAgentImpl implements UserAgent
{
    // Standard desktop browser version strings.
    public static final String IE      = "MSIE";
    public static final String IE60    = "MSIE 6.0";
    public static final String IE61    = "MSIE 6.1";
    public static final String IE7     = "MSIE 7.0";
    public static final String IE8     = "MSIE 8.0";
    public static final String IE9     = "MSIE 9.0";
    public static final String CHROME  = "Chrome";
    public static final String FIREFOX = "Firefox";
    public static final String SAFARI  = "Safari";

    @Inject
    private Request request;

    public String getUserAgent()
    {
        return request.getHeader("User-Agent");
    }

    public boolean isIE()
    {
        return getUserAgent().indexOf(IE) != -1;
    }

    public boolean isIE6()
    {
        return getUserAgent().indexOf(IE60) != -1 && getUserAgent().indexOf(IE61) != -1;
    }

    public boolean isIE7()
    {
        return getUserAgent().indexOf(IE7) != -1;
    }

    public boolean isIE8()
    {
        return getUserAgent().indexOf(IE8) != -1;
    }

    public boolean isIE9()
    {
        return getUserAgent().indexOf(IE9) != -1;
    }

    public boolean isBadIE()
    {
        return isIE6() || isIE7() || isIE8();
    }

    public boolean isChrome()
    {
        // Chrome contains CHROME and SAFARI, so just test for CHROME.
        return getUserAgent().indexOf(CHROME) != -1;
    }

    public boolean isFirefox()
    {
        // Firefox contains FIREFOX.
        return getUserAgent().indexOf(FIREFOX) != -1;
    }

    public boolean isSafari()
    {
        // Safari contains SAFARI, but not CHROME, so test for SAFARI with a missing CHROME.
        return getUserAgent().indexOf(SAFARI) != -1 && getUserAgent().indexOf(CHROME) == -1;
    }
}