Why can't I find the 'Function' function in webDriver?

I want to implement a simple waitForXX under webdriver.

The code is pretty simple.

Function<WebDriver, WebElement> presenceOfElementLocated(final By locator) {

    return new Function<WebDriver,开发者_开发技巧 WebElement>() {

        public WebElement apply(WebDriver driver) {

            return driver.findElement(locator);

        }

    };

}

But still it gives me troubles because I can't seem to import the 'Function' part.

I looked every where under selenium.support.ui where it is supposed to be I guess? But I can't seem to locate it.

I tried with the latest Selenium standalone jar file 2.5.0.

Thanks!

Function<F, t> seems to be from the Guava library. Do you have the Guava jars?

Unfortunately I don't know how to do that in Java but have you had a look at the WebDriverWait class in WebDriver which should do what you want.

The class is in the Support part of the Java Bindings

http://code.google.com/p/selenium/source/browse/trunk/java/client/src/org/openqa/selenium/support/ui/WebDriverWait.java

See how to use it with these tests

http://code.google.com/p/selenium/source/browse/trunk/java/client/test/org/openqa/selenium/support/ui/WebDriverWaitTest.java

Or you could use implicit waits

driver.manage().timeouts().implicitlyWait(3000, MILLISECONDS);
driver.findElement(By.id('foo')); //will wait 3 seconds, if not loaded will throw an exception