jj.webdriver.finder.ImpatientWebElementFinder.java Source code

Introduction

Here is the source code for jj.webdriver.finder.ImpatientWebElementFinder.java

Source

/*
 *    Copyright 2012 Jason Miller
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jj.webdriver.finder;

import javax.inject.Inject;
import javax.inject.Singleton;

import jj.webdriver.WebElementFinder;

import org.openqa.selenium.By;
import org.openqa.selenium.TimeoutException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.slf4j.Logger;

import com.google.common.base.Predicate;

/**
 * waits three seconds for the element to exist and be displayed.  if the
 * element is not found, a warning is logged, and it waits three more
 * seconds, then bails
 * 
 * @author jason
 *
 */
@Singleton
public class ImpatientWebElementFinder implements WebElementFinder {

    private final Logger logger;

    @Inject
    ImpatientWebElementFinder(final Logger logger) {
        this.logger = logger;
    }

    @Override
    public WebElement find(final WebDriver webDriver, final By by) {
        int tries = 1;
        do {
            try {
                new WebDriverWait(webDriver, 3).until(new Predicate<WebDriver>() {

                    @Override
                    public boolean apply(WebDriver webDriver) {
                        WebElement webElement = webDriver.findElement(by);
                        return webElement != null && webElement.isDisplayed();
                    }
                });
                // if we succeed, exit now
                tries = 0;

            } catch (TimeoutException e) {
                if (tries == 0) {
                    throw new AssertionError("gave up locating an element after 6 seconds " + by);
                } else {
                    logger.warn("can't find element {} in 3 seconds. trying three more.", by);
                }
            }

        } while (tries-- > 0);

        return webDriver.findElement(by);
    }
}