# Uses of Class
org.apache.nutch.util.AbstractChecker

Packages that use AbstractChecker
Package
Description
org.apache.nutch.crawl
Crawl control code and tools to run the crawler.
org.apache.nutch.indexer
Index content, configure and run indexing and cleaning jobs to add, update, and delete documents from an index.
org.apache.nutch.net
Web-related interfaces: URL `filters` and `normalizers`.
org.apache.nutch.parse
The `Parse` interface and related classes.

- ## Uses of AbstractChecker in org.apache.nutch.crawl

  Subclasses of AbstractChecker in org.apache.nutch.crawl
  Modifier and Type
  Class
  Description
  `class`
  `CrawlDbReader`
  Read utility for the CrawlDB.
  `class`
  `LinkDbReader`
  Read utility for the LinkDb.

- ## Uses of AbstractChecker in org.apache.nutch.indexer

  Subclasses of AbstractChecker in org.apache.nutch.indexer
  Modifier and Type
  Class
  Description
  `class`
  `IndexingFiltersChecker`
  Reads and parses a URL and run the indexers on it.

- ## Uses of AbstractChecker in org.apache.nutch.net

  Subclasses of AbstractChecker in org.apache.nutch.net
  Modifier and Type
  Class
  Description
  `class`
  `URLFilterChecker`
  Checks one given filter or all filters.
  `class`
  `URLNormalizerChecker`
  Checks one given normalizer or all normalizers.

- ## Uses of AbstractChecker in org.apache.nutch.parse

  Subclasses of AbstractChecker in org.apache.nutch.parse
  Modifier and Type
  Class
  Description
  `class`
  `ParserChecker`
  Parser checker, useful for testing parser.