Package com.digitalpebble.stormcrawler.parse.filter

Class MD5SignatureParseFilter

java.lang.Object

com.digitalpebble.stormcrawler.util.AbstractConfigurable

com.digitalpebble.stormcrawler.parse.ParseFilter

com.digitalpebble.stormcrawler.parse.filter.MD5SignatureParseFilter

All Implemented Interfaces:

Configurable

public class MD5SignatureParseFilter
extends ParseFilter

Computes a signature for a page, based on the binary content or text. If the content is empty, the URL is used.

Configuration properties:

useText

compute signature on plain text, instead of binary content

keyName

name of the metadata field to hold the signature (default: "signature")

keyNameCopy

name of the metadata field to hold a temporary copy of the signature used to decide by signature comparison whether the document has changed. If not defined or empty, the signature is not copied.

Constructor Summary

Constructors

Constructor	Description
MD5SignatureParseFilter()

Method Summary

Modifier and Type	Method	Description
void	configure(@NotNull Map<String,Object> stormConf, @NotNull com.fasterxml.jackson.databind.JsonNode filterParams)	Called when this filter is being initialized
void	filter(String URL, byte[] content, DocumentFragment doc, ParseResult parse)	Called when parsing a specific page

Methods inherited from class com.digitalpebble.stormcrawler.parse.ParseFilter

needsDOM

Methods inherited from class com.digitalpebble.stormcrawler.util.AbstractConfigurable

configure, getName

Methods inherited from class java.lang.Object

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

Constructor Detail

MD5SignatureParseFilter

public MD5SignatureParseFilter()

Method Detail

filter

public void filter(String URL,
                   byte[] content,
                   DocumentFragment doc,
                   ParseResult parse)

Description copied from class: ParseFilter

Called when parsing a specific page

Specified by:

filter in class ParseFilter

Parameters:

URL - the URL of the page being parsed

content - the content being parsed

doc - the DOM tree resulting of the parsing of the content or null if ParseFilter.needsDOM() returns false

parse - the metadata to be updated with the resulting of the parsing

configure

public void configure(@NotNull
                      @NotNull Map<String,Object> stormConf,
                      @NotNull
                      @NotNull com.fasterxml.jackson.databind.JsonNode filterParams)

Description copied from interface: Configurable

Called when this filter is being initialized

Parameters:

stormConf - The Storm configuration used for the configurable

filterParams - the filter specific configuration. Never null