org.terrier.structures.postings

Class ProximityIterablePosting

java.lang.Object

org.terrier.structures.postings.IterablePostingImpl

org.terrier.structures.postings.ANDIterablePosting

org.terrier.structures.postings.ProximityIterablePosting

All Implemented Interfaces:

Closeable, AutoCloseable, IterablePosting, Posting

public class ProximityIterablePosting
extends ANDIterablePosting

Implementation of an IterablePosting for block indices that returns only documents that match phases within a fixed window size.

Since:

3.6

Author:

Matteo Catena and Richard McCreadie

Field Summary

Fields

Modifier and Type	Field and Description
protected int	window

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

currentId, frequency, ips, termCount

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

EOL

Constructor Summary

Constructors

Constructor and Description
ProximityIterablePosting(IterablePosting[] _ips, Pointer[] _p, int window)

Method Summary

Methods

Modifier and Type	Method and Description
protected boolean	calculateFrequency() returns true if the document matches
static IterablePosting	createProximityPostingList(Pointer[] ps, PostingIndex<Pointer> invIndex, int blockDistance)
static IterablePosting	createProximityPostingList(String[] terms, Lexicon<String> lex, PostingIndex<Pointer> invIndex, int blockDistance)

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

asWritablePosting, close, endOfPostings, getDocumentLength, getFrequency, getId, next, setId

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

next

Methods inherited from class java.lang.Object

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

Field Detail

window

protected int window

Constructor Detail

ProximityIterablePosting

public ProximityIterablePosting(IterablePosting[] _ips,
                        Pointer[] _p,
                        int window)
                         throws IOException

Throws:

IOException

Method Detail

calculateFrequency

protected boolean calculateFrequency()

Description copied from class: ANDIterablePosting

returns true if the document matches

Overrides:

calculateFrequency in class ANDIterablePosting

createProximityPostingList

public static IterablePosting createProximityPostingList(Pointer[] ps,
                                         PostingIndex<Pointer> invIndex,
                                         int blockDistance)
                                                  throws IOException

Throws:

IOException

createProximityPostingList

public static IterablePosting createProximityPostingList(String[] terms,
                                         Lexicon<String> lex,
                                         PostingIndex<Pointer> invIndex,
                                         int blockDistance)
                                                  throws IOException

Throws:

IOException