Package org.apache.nutch.urlfilter.domain

Class DomainURLFilter

java.lang.Object
org.apache.nutch.urlfilter.domain.DomainURLFilter
All Implemented Interfaces:
Configurable, URLFilter, Pluggable
public class DomainURLFilter extends Object implements URLFilter

Filters URLs based on a file containing domain suffixes, domain names, and hostnames. Only a URL that matches one of the suffixes, domains, or hosts present in the file is allowed.

URLs are checked in order of domain suffix, domain name, and hostname against entries in the domain file. The domain file would be setup as follows with one entry per line: 

 com
 apache.org
 www.apache.org

The first line is an example of a filter that would allow all .com domains. The second line allows all URLs from apache.org and all of its subdomains such as lucene.apache.org and hadoop.apache.org. The third line would allow only URLs from www.apache.org. There is no specific ordering to entries. The entries are from more general to more specific with the more general overriding the more specific.

The domain file defaults to domain-urlfilter.txt in the classpath but can be overridden using the:
  • property "urlfilter.domain.file" in ./conf/nutch-*.xml, and
  • attribute "file" in plugin.xml of this plugin

  • Constructor Details

    • DomainURLFilter

      public DomainURLFilter()

  • Method Details

    • setConf

      public void setConf(Configuration conf)
      Sets the configuration.
      Specified by:
      setConf in interface Configurable

    • getConf

      public Configuration getConf()
      Specified by:
      getConf in interface Configurable

    • filter

      public String filter(String url)
      Description copied from interface: URLFilter
      Interface for a filter that transforms a URL: it can pass the original URL through or "delete" the URL by returning null
      Specified by:
      filter in interface URLFilter
      Parameters:
      url - the URL string the filter is applied on
      Returns:
      the original URL string if the URL is accepted by the filter or null in case the URL is rejected