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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NUTCH-2139) Basic plugin to index inlinks and outlinks
Date Thu, 15 Oct 2015 19:21:05 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-2139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14959460#comment-14959460
] 

ASF GitHub Bot commented on NUTCH-2139:
---------------------------------------

Github user jorgelbg commented on a diff in the pull request:

    https://github.com/apache/nutch/pull/78#discussion_r42168120
  
    --- Diff: src/plugin/index-links/src/java/org/apache/nutch/indexer/links/LinksIndexingFilter.java
---
    @@ -0,0 +1,168 @@
    +/**
    + * 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.links;
    +
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.io.Text;
    +import org.apache.nutch.crawl.CrawlDatum;
    +import org.apache.nutch.crawl.Inlink;
    +import org.apache.nutch.crawl.Inlinks;
    +import org.apache.nutch.indexer.IndexingException;
    +import org.apache.nutch.indexer.IndexingFilter;
    +import org.apache.nutch.indexer.NutchDocument;
    +import org.apache.nutch.parse.Outlink;
    +import org.apache.nutch.parse.Parse;
    +import org.slf4j.LoggerFactory;
    +
    +import java.net.MalformedURLException;
    +import java.net.URL;
    +import java.util.HashSet;
    +import java.util.Iterator;
    +import java.util.Set;
    +
    +/**
    + * An {@link org.apache.nutch.indexer.IndexingFilter} that adds
    + * <code>outlinks</code> and <code>inlinks</code> field(s) to
the document.
    + *
    + * In case that you want to ignore the outlinks that point to the same host
    + * as the URL being indexed use the following settings in your configuration
    + * file:
    + *
    + * <property>
    + *   <name>outlinks.host.ignore</name>
    + *   <value>true</value>
    + * </property>
    + *
    + * The same configuration is available for inlinks:
    + *
    + * <property>
    + *   <name>inlinks.host.ignore</name>
    + *   <value>true</value>
    + * </property>
    + *
    + * To store only the host portion of each inlink URL or outlink URL add the
    + * following to your configuration file.
    + *
    + * <property>
    + *   <name>links.hosts.only</name>
    + *   <value>false</value>
    + * </property>
    + *
    + */
    +public class LinksIndexingFilter implements IndexingFilter {
    +
    +  public final static String LINKS_OUTLINKS_HOST = "outlinks.host.ignore";
    +  public final static String LINKS_INLINKS_HOST = "inlinks.host.ignore";
    +  public final static String LINKS_ONLY_HOSTS = "links.hosts.only";
    +
    +  public final static org.slf4j.Logger LOG = LoggerFactory
    +      .getLogger(LinksIndexingFilter.class);
    +
    +  private Configuration conf;
    +  private boolean filterOutlinks;
    +  private boolean filterInlinks;
    +  private boolean indexHost;
    +
    +  @Override
    +  public NutchDocument filter(NutchDocument doc, Parse parse, Text url,
    +      CrawlDatum datum, Inlinks inlinks) throws IndexingException {
    +
    +    // Add the outlinks
    +    Outlink[] outlinks = parse.getData().getOutlinks();
    +
    +    try {
    +      if (outlinks != null) {
    +        Set<String> hosts = new HashSet<String>();
    +
    +        for (Outlink outlink : outlinks) {
    +          String linkUrl = outlink.getToUrl();
    +          String outHost = new URL(linkUrl).getHost();
    +
    +          if (indexHost) {
    +            linkUrl = new URL(outlink.getToUrl()).getHost();
    +
    +            if (hosts.contains(linkUrl))
    +              continue;
    +
    +            hosts.add(linkUrl);
    +          }
    +
    +          addFilteredLink("outlinks", url.toString(), linkUrl, outHost,
    +              filterOutlinks, doc);
    +        }
    +      }
    +    } catch (MalformedURLException e) {
    +      LOG.error("Malformed URL in {}: {}", url, e.getMessage());
    +    }
    +
    +    // Add the inlinks
    +    if (null != inlinks) {
    +      Iterator<Inlink> iterator = inlinks.iterator();
    +      Set<String> inlinkHosts = new HashSet<String>();
    +
    +      try {
    +        while (iterator.hasNext()) {
    --- End diff --
    
    I though the same, since the URL is already is fetched shouldn't be any trouble, but its
an easy fix so I can put it inside the while loop.


> Basic plugin to index inlinks and outlinks
> ------------------------------------------
>
>                 Key: NUTCH-2139
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2139
>             Project: Nutch
>          Issue Type: Improvement
>          Components: indexer, plugin
>            Reporter: Jorge Luis Betancourt Gonzalez
>            Priority: Minor
>              Labels: link, plugin
>             Fix For: 1.11
>
>
> Basic plugin that allows to index the inlinks and outlinks of the web pages, this could
be very useful for analytic purposes, including neat visualizations using d3.js for instance.




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