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

- Packages that use NutchTool
  Package | Description
  --- | ---
  org.apache.nutch.crawl | Crawl control code and tools to run the crawler.
  org.apache.nutch.fetcher | The Nutch multi-threaded fetching module
  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.parse | The `Parse` interface and related classes.
  org.apache.nutch.service.impl |
  org.apache.nutch.tools | Miscellaneous tools.

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

    Subclasses of NutchTool in org.apache.nutch.crawl
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `CrawlDb` | This class takes the output of the fetcher and updates the crawldb accordingly.
    `class` | `DeduplicationJob` | Generic deduplicator which groups fetched URLs with the same digest and marks all of them as duplicate except the one with the highest score (based on the score in the crawldb, which is not necessarily the same as the score indexed).
    `class` | `Generator` | Generates a subset of a crawl db to fetch.
    `class` | `Injector` | Injector takes a flat text file of URLs (or a folder containing text files) and merges ("injects") these URLs into the CrawlDb.
    `class` | `LinkDb` | Maintains an inverted link map, listing incoming links for each url.

  - ### Uses of NutchTool in org.apache.nutch.fetcher

    Subclasses of NutchTool in org.apache.nutch.fetcher
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `Fetcher` | A queue-based fetcher.

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

    Subclasses of NutchTool in org.apache.nutch.indexer
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `IndexingJob` | Generic indexer which relies on the plugins implementing IndexWriter

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

    Subclasses of NutchTool in org.apache.nutch.parse
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `ParseSegment` |

  - ### Uses of NutchTool in org.apache.nutch.service.impl

    Methods in org.apache.nutch.service.impl that return NutchTool
    Modifier and Type | Method | Description
    --- | --- | ---
    `NutchTool` | JobFactory.`createToolByClassName​(String className, Configuration conf)` |
    `NutchTool` | JobFactory.`createToolByType​(JobManager.JobType type, Configuration conf)` |

    Constructors in org.apache.nutch.service.impl with parameters of type NutchTool
    Constructor | Description
    --- | ---
    `JobWorker​(JobConfig jobConfig, Configuration conf, NutchTool tool)` | To initialize JobWorker thread with the Job Configurations provided by user.
    `ServiceWorker​(ServiceConfig serviceConfig, NutchTool tool)` |

  - ### Uses of NutchTool in org.apache.nutch.tools

    Subclasses of NutchTool in org.apache.nutch.tools
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `CommonCrawlDataDumper` | The Common Crawl Data Dumper tool enables one to reverse generate the raw content from Nutch segment data directories into a common crawling data format, consumed by many applications.