| /* |
| * 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.indexer.basic; |
| |
| import org.apache.nutch.metadata.Nutch; |
| import org.apache.nutch.parse.Parse; |
| |
| import org.apache.nutch.indexer.IndexingFilter; |
| import org.apache.nutch.indexer.IndexingException; |
| import org.apache.nutch.indexer.NutchDocument; |
| import org.apache.nutch.util.StringUtil; |
| import org.apache.nutch.util.URLUtil; |
| import org.apache.hadoop.io.Text; |
| |
| import org.apache.nutch.crawl.CrawlDatum; |
| import org.apache.nutch.crawl.Inlinks; |
| |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.util.Date; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * Adds basic searchable fields to a document. The fields added are : domain, |
| * host, url, content, title, cache, tstamp domain is included depending on |
| * {@code indexer.add.domain} in nutch-default.xml. title is truncated as per |
| * {@code indexer.max.title.length} in nutch-default.xml. (As per NUTCH-1004, a |
| * zero-length title is not added) content is truncated as per |
| * {@code indexer.max.content.length} in nutch-default.xml. |
| */ |
| public class BasicIndexingFilter implements IndexingFilter { |
| |
| private int MAX_TITLE_LENGTH; |
| private int MAX_CONTENT_LENGTH; |
| private boolean addDomain = false; |
| private Configuration conf; |
| |
| /** |
| * The {@link BasicIndexingFilter} filter object which supports few |
| * configuration settings for adding basic searchable fields. See |
| * {@code indexer.add.domain}, {@code indexer.max.title.length}, |
| * {@code indexer.max.content.length} in nutch-default.xml. |
| * |
| * @param doc |
| * The {@link NutchDocument} object |
| * @param parse |
| * The relevant {@link Parse} object passing through the filter |
| * @param url |
| * URL to be filtered for anchor text |
| * @param datum |
| * The {@link CrawlDatum} entry |
| * @param inlinks |
| * The {@link Inlinks} containing anchor text |
| * @return filtered NutchDocument |
| */ |
| @Override |
| public NutchDocument filter(NutchDocument doc, Parse parse, Text url, |
| CrawlDatum datum, Inlinks inlinks) throws IndexingException { |
| |
| Text reprUrl = (Text) datum.getMetaData().get(Nutch.WRITABLE_REPR_URL_KEY); |
| String reprUrlString = reprUrl != null ? reprUrl.toString() : null; |
| String urlString = url.toString(); |
| |
| String host = null; |
| try { |
| URL u; |
| if (reprUrlString != null) { |
| u = new URL(reprUrlString); |
| } else { |
| u = new URL(urlString); |
| } |
| |
| if (addDomain) { |
| doc.add("domain", URLUtil.getDomainName(u)); |
| } |
| |
| host = u.getHost(); |
| } catch (MalformedURLException e) { |
| throw new IndexingException(e); |
| } |
| |
| if (host != null) { |
| doc.add("host", host); |
| } |
| |
| doc.add("url", reprUrlString == null ? urlString : reprUrlString); |
| |
| // content |
| String content = parse.getText(); |
| if (MAX_CONTENT_LENGTH > -1 && content.length() > MAX_CONTENT_LENGTH) { |
| content = content.substring(0, MAX_CONTENT_LENGTH); |
| } |
| doc.add("content", StringUtil.cleanField(content)); |
| |
| // title |
| String title = parse.getData().getTitle(); |
| if (MAX_TITLE_LENGTH > -1 && title.length() > MAX_TITLE_LENGTH) { // truncate |
| // title |
| // if |
| // needed |
| title = title.substring(0, MAX_TITLE_LENGTH); |
| } |
| |
| if (title.length() > 0) { |
| // NUTCH-1004 Do not index empty values for title field |
| doc.add("title", StringUtil.cleanField(title)); |
| } |
| |
| // add cached content/summary display policy, if available |
| String caching = parse.getData().getMeta(Nutch.CACHING_FORBIDDEN_KEY); |
| if (caching != null && !caching.equals(Nutch.CACHING_FORBIDDEN_NONE)) { |
| doc.add("cache", caching); |
| } |
| |
| // add timestamp when fetched, for deduplication |
| doc.add("tstamp", new Date(datum.getFetchTime())); |
| |
| return doc; |
| } |
| |
| /** |
| * Set the {@link Configuration} object |
| */ |
| @Override |
| public void setConf(Configuration conf) { |
| this.conf = conf; |
| this.MAX_TITLE_LENGTH = conf.getInt("indexer.max.title.length", 100); |
| this.addDomain = conf.getBoolean("indexer.add.domain", false); |
| this.MAX_CONTENT_LENGTH = conf.getInt("indexer.max.content.length", -1); |
| } |
| |
| /** |
| * Get the {@link Configuration} object |
| */ |
| @Override |
| public Configuration getConf() { |
| return this.conf; |
| } |
| |
| } |