org.terrier.structures.postings.bit

Class BasicIterablePostingDocidOnly

java.lang.Object

org.terrier.structures.postings.BasicPostingImpl

org.terrier.structures.postings.bit.BasicIterablePosting

org.terrier.structures.postings.bit.BasicIterablePostingDocidOnly

All Implemented Interfaces:

Closeable, Serializable, AutoCloseable, org.apache.hadoop.io.Writable, IterablePosting, Posting, WritablePosting

public class BasicIterablePostingDocidOnly
extends BasicIterablePosting

Posting iterator class that only returns identifiers, not frequencies. This differs from BasicIterablePosting in that only ids are recorded.

Since:

3.0

Author:

Craig Macdonald

See Also:

Serialized Form

Field Summary

Fields inherited from class org.terrier.structures.postings.bit.BasicIterablePosting

bitFileReader, doi, numEntries

Fields inherited from class org.terrier.structures.postings.BasicPostingImpl

dl, id, tf

Fields inherited from interface org.terrier.structures.postings.IterablePosting

END_OF_LIST, EOL

Constructor Summary

Constructors

Constructor and Description
BasicIterablePostingDocidOnly() Create a new posting iterator
BasicIterablePostingDocidOnly(BitIn _bitFileReader, int _numEntries, DocumentIndex _doi) Create a new posting iterator

Method Summary

Modifier and Type	Method and Description
int	next() Move this iterator to the next posting.

Methods inherited from class org.terrier.structures.postings.bit.BasicIterablePosting

asWritablePosting, close, endOfPostings, getDocumentLength, next, toString

Methods inherited from class org.terrier.structures.postings.BasicPostingImpl

getFrequency, getId, readFields, setDocumentLength, setId, setTf, write

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.terrier.structures.postings.Posting

getFrequency, getId, setId

Constructor Detail

BasicIterablePostingDocidOnly

public BasicIterablePostingDocidOnly()

Create a new posting iterator

BasicIterablePostingDocidOnly

public BasicIterablePostingDocidOnly(BitIn _bitFileReader,
                                     int _numEntries,
                                     DocumentIndex _doi)
                              throws IOException

Create a new posting iterator

Parameters:

_bitFileReader - BitIn to read the postings from

_numEntries - number of postings in the list

_doi - document index to use to satisfy getDocumentLength()

Throws:

IOException - thrown in an IO exception occurs

Method Detail

next

public int next()
         throws IOException

Move this iterator to the next posting.

Specified by:

next in interface IterablePosting

Overrides:

next in class BasicIterablePosting

Returns:

id of next posting, or EOL if end of posting list

Throws:

IOException