谓词硒过滤器 [英] selenium filter with Predicate

问题描述

我希望使用和了解谓词和Lambda表达式.特别是与硒一起使用.

I am looking to use and learn about the Predicate and Lambda expression. In particular using it with selenium.

想象一下，您有大量的WebElements(列表)选择，并且您希望对其应用谓词过滤器，以使列表更小.

Imagine you have a large selection(List) of WebElements and you want to apply a predicate filter to it so that the list is smaller .

我在1,2,3的正确轨道上，我会做出哪些改变?

Am I on the right track for 1,2,3 below what changes would I meed to make?

List<WebElement> webElements = driver.findElements(By.cssSelector(".someClassName")); // returns large list  

// then try and filter down the list
Predicate<WebElement> hasRedClass -> Predicate.getAttribute("class").contains("red-background");

Predicate<WebElement> hasDataToggleAttr -> Predicate.getAttribute("data-toggle").size() > 0;

// without predicate  probably  looks like this
//driver.findElements(By.cssSelector(".someClassName .red-background"));

// 1.  this is what I think it should look like???  
List<WebElement> webElementsWithClass =  webElements.filter(hasRedClass);

// 2.  with hasDataToggleAttr
List<WebElement> webElementsWithDataToggleAttr = webElements.filter(hasDataToggleAttr);


// 3.  with both of them together...
List<WebElement> webElementsWithBothPredicates = webElements.filter(hasRedClass, hasDataToggleAttr);

推荐答案

我希望这里是您要寻找的东西:

I hope here is what you are looking for:

List<WebElement> webElements = driver.findElements(By.cssSelector(".someClassName")); // returns large list

// then try and filter down the list
Predicate<WebElement> hasRedClass = we -> we.getAttribute("class").contains("red-background");

Predicate<WebElement> hasDataToggleAttr = we -> we.getAttribute("data-toggle").length() > 0;

// without predicate  probably  looks like this
//driver.findElements(By.cssSelector(".someClassName .red-background"));
// 1.  this is what I think it should look like???
List<WebElement> webElementsWithClass = webElements.stream()
        .filter(hasRedClass).collect(Collectors.toList());

// 2.  with hasDataToggleAttr
List<WebElement> webElementsWithDataToggleAttr = webElements.stream()
        .filter(hasDataToggleAttr).collect(Collectors.toList());

// 3.  with both of them together...
List<WebElement> webElementsWithBothPredicates = webElements.stream()
        .filter(hasDataToggleAttr.and(hasRedClass)).collect(Collectors.toList());

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