org.apache.nutch.crawl

## Class LinkDbReader

- java.lang.Object
- - org.apache.hadoop.conf.Configured
  - - org.apache.nutch.util.AbstractChecker
    - - org.apache.nutch.crawl.LinkDbReader

- All Implemented Interfaces:
    Closeable, AutoCloseable, Configurable, Tool

      public class LinkDbReader
      extends AbstractChecker
      implements Closeable

  Read utility for the LinkDb.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `LinkDbReader.LinkDBDumpMapper`

  - ### Field Summary

    - ### Fields inherited from class org.apache.nutch.util.AbstractChecker

      `keepClientCnxOpen, stdin, tcpPort, usage`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `LinkDbReader()`
    `LinkDbReader(Configuration conf, Path directory)`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close()`
    `String[]` | `getAnchors(Text url)`
    `Inlinks` | `getInlinks(Text url)`
    `void` | `init(Path directory)`
    `static void` | `main(String[] args)`
    `void` | `openReaders()`
    `protected int` | `process(String line, StringBuilder output)`
    `void` | `processDumpJob(String linkdb, String output, String regex)`
    `int` | `run(String[] args)`

    - ### Methods inherited from class org.apache.nutch.util.AbstractChecker

      `getProtocolOutput, parseArgs, processSingle, processStdin, processTCP, run`

    - ### Methods inherited from class org.apache.hadoop.conf.Configured

      `getConf, setConf`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface org.apache.hadoop.conf.Configurable

      `getConf, setConf`

- - ### Constructor Detail

    - #### LinkDbReader

          public LinkDbReader()

    - #### LinkDbReader

          public LinkDbReader(Configuration conf,
                              Path directory)
                       throws Exception

      Throws:
        `Exception`

  - ### Method Detail

    - #### init

          public void init(Path directory)
                    throws Exception

      Throws:
        `Exception`

    - #### openReaders

          public void openReaders()
                           throws IOException

      Throws:
        `IOException`

    - #### getAnchors

          public String[] getAnchors(Text url)
                              throws IOException

      Throws:
        `IOException`

    - #### getInlinks

          public Inlinks getInlinks(Text url)
                             throws IOException

      Throws:
        `IOException`

    - #### close

          public void close()
                     throws IOException

      Specified by:
        `close` in interface `Closeable`
      Specified by:
        `close` in interface `AutoCloseable`
      Throws:
        `IOException`

    - #### processDumpJob

          public void processDumpJob(String linkdb,
                                     String output,
                                     String regex)
                              throws IOException,
                                     InterruptedException,
                                     ClassNotFoundException

      Throws:
        `IOException`
        `InterruptedException`
        `ClassNotFoundException`

    - #### process

          protected int process(String line,
                                StringBuilder output)
                         throws Exception

      Specified by:
        `process` in class `AbstractChecker`
      Throws:
        `Exception`

    - #### main

          public static void main(String[] args)
                           throws Exception

      Throws:
        `Exception`

    - #### run

          public int run(String[] args)
                  throws Exception

      Specified by:
        `run` in interface `Tool`
      Throws:
        `Exception`

Copyright © 2020 The Apache Software Foundation