org.apache.nutch.protocol.interactiveselenium.DefaultClickAllAjaxLinksHandler.java Source code

Introduction

Here is the source code for org.apache.nutch.protocol.interactiveselenium.DefaultClickAllAjaxLinksHandler.java

Source

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.nutch.protocol.interactiveselenium;

import java.util.List;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.util.StringUtils;
import org.apache.nutch.util.NutchConfiguration;
import org.openqa.selenium.By;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This handler clicks all the <a hfer="javascript:void(null);"> tags
 * because it considers them as not usual links but ajax links/interactions. This uses the same logic of 
 * DefalultMultiInteractionHandler. 
 */
public class DefaultClickAllAjaxLinksHandler implements InteractiveSeleniumHandler {
    private static final Logger LOG = LoggerFactory.getLogger(DefaultClickAllAjaxLinksHandler.class);

    public String processDriver(WebDriver driver) {

        String accumulatedData = "";
        try {

            driver.findElement(By.tagName("body")).getAttribute("innerHTML");
            Configuration conf = NutchConfiguration.create();
            new WebDriverWait(driver, conf.getLong("libselenium.page.load.delay", 3));

            List<WebElement> atags = driver.findElements(By.tagName("a"));
            int numberofajaxlinks = atags.size();
            for (int i = 0; i < numberofajaxlinks; i++) {

                if (atags.get(i).getAttribute("href") != null
                        && atags.get(i).getAttribute("href").equals("javascript:void(null);")) {

                    atags.get(i).click();

                    if (i == numberofajaxlinks - 1) {
                        // append everything to the driver in the last round
                        JavascriptExecutor jsx = (JavascriptExecutor) driver;
                        jsx.executeScript(
                                "document.body.innerHTML=document.body.innerHTML " + accumulatedData + ";");
                        continue;
                    }

                    accumulatedData += driver.findElement(By.tagName("body")).getAttribute("innerHTML");

                    // refreshing the handlers as the page was interacted with
                    driver.navigate().refresh();
                    new WebDriverWait(driver, conf.getLong("libselenium.page.load.delay", 3));
                    atags = driver.findElements(By.tagName("a"));
                }
            }
        } catch (Exception e) {
            LOG.info(StringUtils.stringifyException(e));
        }
        return accumulatedData;
    }

    public boolean shouldProcessURL(String URL) {
        return true;
    }
}