WebDriverWait wait.until(Function, isFalse) possible?

[confusa]

In selenium I used a lot of waiting until an element had left the page
until I moved on, essentially the reverse of waitForElementPresent. In
Webdriver I see we now have a handy WebDriverWait class, but I only
have the ability of doing a wait.(Function, "isTrue"), the isTrue is
implied. How can I get an isFalse in there? Make sense?

[JohnMc]

When you implement the until() method just make it return true when
your condition is met.

so tweeking the example from the Wait JavaDoc page (See it here
http://selenium.googlecode.com/svn/trunk/docs/api/java/index.html):

new Wait("Waiting for element to go away") {
boolean until() {
RenderedWebElement element =
driver.findElement(By.id("myID"));
return !element.isDisplayed;
}
};

Just make it return true when the element is not present.

[Simon Stewart]

The simplest thing to do is to write a "not" function, that inverts
the result of the Function.

Simon

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[confusa]

I thought about that as the cleanest solution, but couldn't quite
figure it out. The way I constructed a wait is like so:

protected WebElement waitForElementIdPresent(String id) {
WebDriverWait wait = new WebDriverWait(driver, 6000);
WebElement element =
wait.until(presenceOfElementLocated(By.id(id)));
return element;
}

protected Function<WebDriver, WebElement>
presenceOfElementLocated(final By locator) {
return new Function<WebDriver, WebElement>() {
public WebElement apply(WebDriver driver) {
return driver.findElement(locator);
}
};
}

Not sure how to invert that function I tried this but no joy:

WebElement element =
wait.until(!presenceOfElementLocated(By.id(id)));

[Simon Stewart]

The "not" exepected condition would look something like:

public ExpectedCondition<Boolean> not(
final ExpectedCondition<?> toInvert) {
return new ExpectedCondition<Boolean>() {
public Boolean apply(WebDriver driver) {
try {
Object result = toInvert.apply(driver);
return (result == null || result == Boolean.FALSE);
} catch (Exception e) {
// You may want to tweak this bit
return true;
}
}
};
}

Simon