nz.ac.waikato.mcennis.rat.crawler.filter
Class XorFilter

java.lang.Object
  extended by nz.ac.waikato.mcennis.rat.crawler.filter.XorFilter
All Implemented Interfaces:
CrawlerFilter

public class XorFilter
extends java.lang.Object
implements CrawlerFilter

Creates a filter that performs an XOr operation upon the return values of the two sub-filters.


Constructor Summary
XorFilter()
           
 
Method Summary
 void build(CrawlerFilter left, CrawlerFilter right, boolean not)
          Builds an XOR filter from the given pieces.
 boolean check(java.lang.String site)
          Should the URL this string represents be retrieved
 boolean check(java.lang.String site, Properties parameters)
          Should the URL this string represents be retrieved, given the parameters provided
 void load(java.lang.String site)
          Submit the given site to the filter chain without retrieving it.
 void load(java.lang.String site, Properties parameters)
          Submit the given site - parameter combination to the filter chain without retrieving it.
 XorFilter prototype()
          Creates a new default version of this class with no common data excepting static variables
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

XorFilter

public XorFilter()
Method Detail

check

public boolean check(java.lang.String site)
Description copied from interface: CrawlerFilter
Should the URL this string represents be retrieved

Specified by:
check in interface CrawlerFilter
Parameters:
site - URL of the site to be retrieved
Returns:
retrieve or not retrieve

check

public boolean check(java.lang.String site,
                     Properties parameters)
Description copied from interface: CrawlerFilter
Should the URL this string represents be retrieved, given the parameters provided

Specified by:
check in interface CrawlerFilter
Parameters:
site - URL to be retrieved
parameters - parameters governing the retrieval
Returns:
retrieve or not retrieve

build

public void build(CrawlerFilter left,
                  CrawlerFilter right,
                  boolean not)
Builds an XOR filter from the given pieces. If any parameter is null, a warning is issued and the original value (NullFilter by default) is used instead.

Parameters:
left - first filter executed
right - second filter executed
not - should the result be negated before returning

load

public void load(java.lang.String site)
Description copied from interface: CrawlerFilter
Submit the given site to the filter chain without retrieving it.

Specified by:
load in interface CrawlerFilter
Parameters:
site - URL to be added

load

public void load(java.lang.String site,
                 Properties parameters)
Description copied from interface: CrawlerFilter
Submit the given site - parameter combination to the filter chain without retrieving it.

Specified by:
load in interface CrawlerFilter
Parameters:
site - URL to be added

prototype

public XorFilter prototype()
Description copied from interface: CrawlerFilter
Creates a new default version of this class with no common data excepting static variables

Specified by:
prototype in interface CrawlerFilter
Returns:
new filter of the same class as the parent

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