Package com.norconex.collector.http.link.impl

Class XMLFeedLinkExtractor

java.lang.Object

com.norconex.collector.http.link.AbstractLinkExtractor

com.norconex.collector.http.link.AbstractTextLinkExtractor

com.norconex.collector.http.link.impl.XMLFeedLinkExtractor

All Implemented Interfaces:

ILinkExtractor, IXMLConfigurable

public class XMLFeedLinkExtractor
extends AbstractTextLinkExtractor

Link extractor for extracting links out of RSS and Atom XML feeds. It extracts the content of <link> tags. If you need more complex extraction, consider using RegexLinkExtractor or creating your own ILinkExtractor implementation.

Applicable documents

By default, this extractor only will be applied on documents matching one of these content types:

Referrer data

The following referrer information is stored as metadata in each document represented by the extracted URLs:

• Referrer reference: The reference (URL) of the page where the link to a document was found. Metadata value is HttpDocMetadata.REFERRER_REFERENCE.

XML configuration usage:

<extractor
    class="com.norconex.collector.http.link.impl.XMLFeedLinkExtractor">
  <fieldMatcher>
    (optional expression for fields used for links extraction instead
     of the document stream)
  </fieldMatcher>
</extractor>

XML usage example:

<extractor
    class="com.norconex.collector.http.link.impl.XMLFeedLinkExtractor">
  <restrictTo
      field="document.reference"
      method="regex">
    .*rss$
  </restrictTo>
</extractor>

The above example specifies this extractor should only apply on documents that have their URL ending with "rss" (in addition to the default content types supported).

Since:

2.7.0

Author:

Pascal Essiembre

Constructor Summary

Constructors

Constructor	Description
XMLFeedLinkExtractor()

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object other)
void	extractTextLinks(Set<Link> links, HandlerDoc doc, Reader reader)
int	hashCode()
protected void	loadTextLinkExtractorFromXML(XML xml)	Loads configuration settings specific to the implementing class.
protected void	saveTextLinkExtractorToXML(XML xml)	Saves configuration settings specific to the implementing class.
String	toString()

Methods inherited from class com.norconex.collector.http.link.AbstractTextLinkExtractor

extractLinks, getFieldMatcher, loadLinkExtractorFromXML, saveLinkExtractorToXML, setFieldMatcher

Methods inherited from class com.norconex.collector.http.link.AbstractLinkExtractor

addRestriction, addRestrictions, clearRestrictions, extractLinks, getRestrictions, loadFromXML, removeRestriction, removeRestriction, saveToXML, setRestrictions

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

XMLFeedLinkExtractor

public XMLFeedLinkExtractor()

Method Details

extractTextLinks

public void extractTextLinks(Set<Link> links,
 HandlerDoc doc,
 Reader reader)
                      throws IOException

Specified by:

extractTextLinks in class AbstractTextLinkExtractor

Throws:

IOException

loadTextLinkExtractorFromXML

protected void loadTextLinkExtractorFromXML(XML xml)

Description copied from class: AbstractTextLinkExtractor

Loads configuration settings specific to the implementing class.

Specified by:

loadTextLinkExtractorFromXML in class AbstractTextLinkExtractor

Parameters:

xml - XML configuration

saveTextLinkExtractorToXML

protected void saveTextLinkExtractorToXML(XML xml)

Description copied from class: AbstractTextLinkExtractor

Saves configuration settings specific to the implementing class.

Specified by:

saveTextLinkExtractorToXML in class AbstractTextLinkExtractor

Parameters:

xml - the XML

equals

public boolean equals(Object other)

Overrides:

equals in class AbstractTextLinkExtractor

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractTextLinkExtractor

toString

public String toString()

Overrides:

toString in class AbstractTextLinkExtractor