import org.openqa.selenium.support.ui.Clock; //导入依赖的package包/类
@Override
public Statement apply(Statement statement) throws Throwable {
    return () -> {
        Clock clock = new SystemClock();
        long end = clock.laterBy(timeout.in(TimeUnit.MILLISECONDS));
        Throwable lastException;
        do {
            try {
                return statement.evaluate();
            } catch (Throwable e) {
                lastException = e;
                if (ignoring.stream().anyMatch(clazz -> clazz.isInstance(e))) {
                    try {
                        Thread.sleep(polling.in(TimeUnit.MILLISECONDS));
                    } catch (InterruptedException i) {
                        break;
                    }
                } else {
                    Throwables.propagate(e);
                }
            }
        } while ((clock.isNowBefore(end)));
        throw lastException;
    };
}
 

import org.openqa.selenium.support.ui.Clock; //导入依赖的package包/类
protected SearchContextWait(final SearchContext input, final Clock clock, final Sleeper sleeper, final long timeout,
        final TimeUnit timeoutTimeUnit, final long sleep, final TimeUnit sleepTimeUnit) {
    super(input, clock, sleeper);
    withTimeout(timeout, timeoutTimeUnit);
    pollingEvery(sleep, sleepTimeUnit);
    ignoring(NotFoundException.class);
}
 

import org.openqa.selenium.support.ui.Clock; //导入依赖的package包/类
/**
 * Wait will ignore instances of NotFoundException that are encountered
 * (thrown) by default in the 'until' condition, and immediately propagate
 * all others. You can add more to the ignore list by calling
 * ignoring(exceptions to add).
 * 
 * @param context
 *            The SearchContext instance to pass to the expected conditions
 * @param clock
 *            The clock to use when measuring the timeout
 * @param sleeper
 *            Object used to make the current thread go to sleep.
 * @param timeOutInSeconds
 *            The timeout in seconds when an expectation is
 * @param sleepTimeOut
 *            The timeout used whilst sleeping. Defaults to 500ms called.
 */
public SearchContextWait(SearchContext context, Clock clock, Sleeper sleeper, long timeOutInSeconds,
        long sleepTimeOut) {
    super(context, clock, sleeper);
    withTimeout(timeOutInSeconds, TimeUnit.SECONDS);
    pollingEvery(sleepTimeOut, TimeUnit.MILLISECONDS);
    ignoring(NotFoundException.class);
    this.context = context;
}
 

import org.openqa.selenium.support.ui.Clock; //导入依赖的package包/类
/**
 * @param driver
 *            The WebDriver instance to pass to the expected conditions
 * @param clock
 *            The clock to use when measuring the timeout
 * @param sleeper
 *            Object used to make the current thread go to sleep.
 * @param timeOutInSeconds
 *            The timeout in seconds when an expectation is
 * @param sleepTimeOut
 *            The timeout used whilst sleeping. Defaults to 500ms called.
 */
protected QAFWebDriverWait(QAFExtendedWebDriver driver, Clock clock, Sleeper sleeper,
		long timeOutInMiliSeconds, long sleepTimeOut) {
	super(driver, clock, sleeper);
	withTimeout(timeOutInMiliSeconds, TimeUnit.MILLISECONDS);
	pollingEvery(sleepTimeOut, TimeUnit.MILLISECONDS);
	ignoring(StaleElementReferenceException.class);
}
 

import org.openqa.selenium.support.ui.Clock; //导入依赖的package包/类
/**
 * @param element
 *            The WebElement instance to pass to the expected conditions
 * @param clock
 *            The clock to use when measuring the timeout
 * @param sleeper
 *            Object used to make the current thread go to sleep.
 * @param timeOutInSeconds
 *            The timeout in seconds when an expectation is
 * @param sleepTimeOut
 *            The timeout used whilst sleeping. Defaults to 500ms called.
 */
@SuppressWarnings("unchecked")
protected QAFWebElementWait(QAFExtendedWebElement element, Clock clock, Sleeper sleeper, long timeOutInMiliSeconds,
		long sleepTimeOut) {
	super(element, clock, sleeper);
	withTimeout(timeOutInMiliSeconds, TimeUnit.MILLISECONDS);
	pollingEvery(sleepTimeOut, TimeUnit.MILLISECONDS);
	ignore(NoSuchElementException.class, StaleElementReferenceException.class);
}