org.terrier.indexing

Class TRECWebCollection

java.lang.Object

org.terrier.indexing.TRECCollection

org.terrier.indexing.TRECWebCollection

All Implemented Interfaces:

Closeable, AutoCloseable, Collection, DocumentExtractor

public class TRECWebCollection
extends TRECCollection

Version of TRECCollection which can parse standard form DOCHDR tags in TREC Web corpoa. A standard format DOCHDR tag from WT2G is shown below.

 <DOCHDR>
 http://www.city.geneva.ny.us:80/index.htm 192.108.245.124 19970121041510 text/html 2407
 HTTP/1.0 200 OK
 Date: Tue, 21 Jan 1997 04:14:08 GMT
 Server: Apache/1.1.1
 Content-type: text/html
 Content-length: 2236
 Last-modified: Fri, 18 Oct 1996 17:33:56 GMT
 </DOCHDR>
 

TRECWebCollection parses each HTTP header as Document property. In addition, the URL, IP address, date and length are parsed from the DOCHDR tags. In particular, the following Document properies are set, depending on the format of the DOCHDR tag:

• url (all corpora)
• ip (WT2G, WT10G only)
• docbytelength (WT2G, WT10G, Blog06, Blogs08 only)
• contenttype (WT2G, WT10G only, but usually identified in the HTTP headers)
• crawldate (WT2G, WT10G only)

Supported TREC Collections:
There are some variations in the format of the DOCHDR tags in the various TREC web corpora, in particular the first line of the tag. The following corpora are supported.

• WT2G, WT10G: URL IP Crawldate content-type docbytelength
• Blogs06,Blogs08: URL invalidIP invalidCrawldate docbytelength
• GOV,GOV2,W3C,CERC: URL

For indexing the more recent TREC ClueWeb09 corpus, see WARC018Collection.

Since:

3.5

Author:

Craig Macdonald

Field Summary

Fields inherited from class org.terrier.indexing.TRECCollection

br, currentFilename, desiredEncoding, DocIDBlacklist, docnotag, DocProperties, documentClass, documentCounter, documentsInThisFile, end_docnoTag, end_docnoTagLength, end_docTag, end_docTagLength, endOfCollection, endPropertyTags, FileNumber, FilesToProcess, ignoreProperties, logger, propertyTagLengths, SkipFile, start_docnoTag, start_docnoTagLength, start_docTag, start_docTagLength, startPropertyTags, tags_CaseSensitive, ThisDocID, tokeniser

Constructor Summary

Constructors

Constructor and Description
TRECWebCollection() Constructs an instance of the TRECWebCollection.
TRECWebCollection(InputStream input) Constructs an instance of the TRECWebCollection, given an InputStream.
TRECWebCollection(String CollectionSpecFilename, String TagSet, String BlacklistSpecFilename, String ignored) Constructs an instance of the TRECWebCollection.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	afterPropertyTags()

Methods inherited from class org.terrier.indexing.TRECCollection

close, endOfCollection, getDocid, getDocument, getDocumentString, getTag, hasNext, loadDocumentClass, next, nextDocument, openNextFile, readCollectionSpec, readDocumentBlacklist, remove, reset, setTags

Methods inherited from class java.lang.Object

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

Constructor Detail

TRECWebCollection

public TRECWebCollection()

Constructs an instance of the TRECWebCollection.

TRECWebCollection

public TRECWebCollection(InputStream input)

Constructs an instance of the TRECWebCollection, given an InputStream.

Parameters:

input -

TRECWebCollection

public TRECWebCollection(String CollectionSpecFilename,
                 String TagSet,
                 String BlacklistSpecFilename,
                 String ignored)

Constructs an instance of the TRECWebCollection.

Parameters:

CollectionSpecFilename -

TagSet -

BlacklistSpecFilename -

ignored -

Method Detail

afterPropertyTags

protected void afterPropertyTags()
                          throws IOException

Overrides:

afterPropertyTags in class TRECCollection

Throws:

IOException