webdriver, expected condition method to wait for angular requests to finish

WaitForAngular.java

        public static ExpectedCondition<Boolean> angularHasFinishedProcessing() {
            return new ExpectedCondition<Boolean>() {
                @Override
                public Boolean apply(WebDriver driver) {
                    String returnValue = ((JavascriptExecutor) driver).executeScript(
                            "return (window.angular !== undefined) && (angular.element(document).injector() !== undefined) && " +
                                    "(angular.element(document).injector().get('$http').pendingRequests.length === 0)").toString();
                    return Boolean.valueOf(returnValue);
                }
            };
        }