org.apache.nutch.protocol

Class RobotRulesParser

java.lang.Object

org.apache.nutch.protocol.RobotRulesParser

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable

Direct Known Subclasses:

FtpRobotRulesParser, HttpRobotRulesParser

public abstract class RobotRulesParser
extends Object
implements org.apache.hadoop.conf.Configurable

This class uses crawler-commons for handling the parsing of robots.txt files. It emits SimpleRobotRules objects, which describe the download permissions as described in SimpleRobotRulesParser.

Field Summary

Fields

Modifier and Type	Field and Description
protected String	agentNames
protected static Hashtable<String,crawlercommons.robots.BaseRobotRules>	CACHE
static crawlercommons.robots.BaseRobotRules	EMPTY_RULES A BaseRobotRules object appropriate for use when the robots.txt file is empty or missing; all requests are allowed.
static crawlercommons.robots.BaseRobotRules	FORBID_ALL_RULES A BaseRobotRules object appropriate for use when the robots.txt file is not fetched due to a 403/Forbidden response; all requests are disallowed.
static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor and Description
RobotRulesParser()
RobotRulesParser(org.apache.hadoop.conf.Configuration conf)

Method Summary

Methods

Modifier and Type	Method and Description
org.apache.hadoop.conf.Configuration	getConf() Get the Configuration object
crawlercommons.robots.BaseRobotRules	getRobotRulesSet(Protocol protocol, org.apache.hadoop.io.Text url)
abstract crawlercommons.robots.BaseRobotRules	getRobotRulesSet(Protocol protocol, URL url)
static void	main(String[] argv) command-line main for testing
crawlercommons.robots.BaseRobotRules	parseRules(String url, byte[] content, String contentType, String robotName) Parses the robots content using the SimpleRobotRulesParser from crawler commons
void	setConf(org.apache.hadoop.conf.Configuration conf) Set the Configuration object

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.slf4j.Logger LOG

CACHE

protected static final Hashtable<String,crawlercommons.robots.BaseRobotRules> CACHE

EMPTY_RULES

public static final crawlercommons.robots.BaseRobotRules EMPTY_RULES

A BaseRobotRules object appropriate for use when the robots.txt file is empty or missing; all requests are allowed.

FORBID_ALL_RULES

public static crawlercommons.robots.BaseRobotRules FORBID_ALL_RULES

A BaseRobotRules object appropriate for use when the robots.txt file is not fetched due to a 403/Forbidden response; all requests are disallowed.

agentNames

protected String agentNames

Constructor Detail

RobotRulesParser

public RobotRulesParser()

RobotRulesParser

public RobotRulesParser(org.apache.hadoop.conf.Configuration conf)

Method Detail

setConf

public void setConf(org.apache.hadoop.conf.Configuration conf)

Set the Configuration object

Specified by:

setConf in interface org.apache.hadoop.conf.Configurable

getConf

public org.apache.hadoop.conf.Configuration getConf()

Get the Configuration object

Specified by:

getConf in interface org.apache.hadoop.conf.Configurable

parseRules

public crawlercommons.robots.BaseRobotRules parseRules(String url,
                                              byte[] content,
                                              String contentType,
                                              String robotName)

Parses the robots content using the SimpleRobotRulesParser from crawler commons

Parameters:

url - A string containing url

content - Contents of the robots file in a byte array

contentType - The

robotName - A string containing value of

Returns:

BaseRobotRules object

getRobotRulesSet

public crawlercommons.robots.BaseRobotRules getRobotRulesSet(Protocol protocol,
                                                    org.apache.hadoop.io.Text url)

getRobotRulesSet

public abstract crawlercommons.robots.BaseRobotRules getRobotRulesSet(Protocol protocol,
                                                    URL url)

main

public static void main(String[] argv)

command-line main for testing