| /* |
| * 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.any23.plugin.crawler; |
| |
| import edu.uci.ics.crawler4j.crawler.Page; |
| import edu.uci.ics.crawler4j.crawler.WebCrawler; |
| import edu.uci.ics.crawler4j.url.WebURL; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.regex.Pattern; |
| |
| /** |
| * Default {@link WebCrawler} implementation. |
| * |
| * @author Michele Mostarda (mostarda@fbk.eu) |
| */ |
| public class DefaultWebCrawler extends WebCrawler { |
| |
| private static final Logger logger = LoggerFactory.getLogger(DefaultWebCrawler.class); |
| |
| /** |
| * Shared data reference. |
| */ |
| private final SharedData sharedData = SharedData.getInstance(); |
| |
| /** |
| * Page filter pattern. |
| */ |
| private final Pattern pattern = sharedData.getPattern(); |
| |
| /** |
| * Override this method to specify whether the given URL should be visited or not. |
| */ |
| |
| @Override |
| public boolean shouldVisit(Page referringPage, WebURL url) { |
| if (!super.shouldVisit(referringPage, url)) |
| return false; |
| if (url.getURL() == null) |
| return false; |
| final String href = url.getURL().toLowerCase(); |
| if (!href.startsWith(sharedData.getSeed())) |
| return false; |
| return pattern == null || !pattern.matcher(href).matches(); |
| } |
| |
| /** |
| * Override this method to implement the single page processing logic. |
| */ |
| @Override |
| public void visit(Page page) { |
| logger.trace("Visiting page: " + page.getWebURL().getURL()); |
| sharedData.notifyPage(page); |
| } |
| |
| } |
| |