org.terrier.matching

Class FatQueryResultSet

java.lang.Object

org.terrier.matching.CollectionResultSet

org.terrier.matching.QueryResultSet

org.terrier.matching.FatQueryResultSet

All Implemented Interfaces:

Serializable, org.apache.hadoop.io.Writable, FatResultSet, ResultSet

public class FatQueryResultSet
extends QueryResultSet
implements FatResultSet

An implementation of FatResultSet.

Since:

4.0

Author:

Craig Macdonald

See Also:

Serialized Form

Field Summary

Fields inherited from class org.terrier.matching.QueryResultSet

metadata, metaMap

Fields inherited from class org.terrier.matching.CollectionResultSet

arraysInitialised, docids, exactResultSize, lock, occurrences, resultSize, scores, statusCode

Constructor Summary

Constructors

Constructor and Description
FatQueryResultSet(int numberOfDocuments, CollectionStatistics cs, String[] qs, EntryStatistics[] es, double[] ks)

Method Summary

Methods

Modifier and Type	Method and Description
CollectionStatistics	getCollectionStatistics() Get the collection statistics that should be applied when (re)scoring any documents in this query
EntryStatistics[]	getEntryStatistics() Return the EntryStatistics of each of the query terms in the query
double[]	getKeyFrequencies() Return the frequencies of each of the query terms in the query
WritablePosting[][]	getPostings() Returns a 2D array of posting objects for the document and terms in this result set.
String[]	getQueryTerms() Get the query terms in this query.
FatResultSet	getResultSet(int start, int length) Crops the existing result file and extracts a subset from the given starting point to the ending point.
void	readFields(DataInput in)
void	setCollectionStatistics(CollectionStatistics cs)
void	setDocids(int[] ds)
void	setEntryStatistics(EntryStatistics[] es)
void	setKeyFrequencies(double[] ks)
void	setOccurrences(short[] os)
void	setPostings(WritablePosting[][] wp)
void	setQueryTerms(String[] qs)
void	setScores(double[] ss)
void	sort(int topDocs) Sorts the top topDocs document in this resultset be first.
void	write(DataOutput out)

Methods inherited from class org.terrier.matching.QueryResultSet

addMetaItem, addMetaItems, addMetaType, getMetaItem, getMetaItems, getMetaKeys, getResultSet, hasMetaItems, initialise, makeNewResultSet

Methods inherited from class org.terrier.matching.CollectionResultSet

getDocids, getExactResultSize, getLock, getOccurrences, getResultSize, getScores, getStatusCode, initialise, setExactResultSize, setResultSize, setStatusCode, sort

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.terrier.matching.ResultSet

addMetaItem, addMetaItems, getDocids, getExactResultSize, getLock, getMetaItem, getMetaItems, getMetaKeys, getOccurrences, getResultSet, getResultSize, getScores, getStatusCode, hasMetaItems, initialise, initialise, setExactResultSize, setResultSize, setStatusCode, sort

Constructor Detail

FatQueryResultSet

public FatQueryResultSet(int numberOfDocuments,
                 CollectionStatistics cs,
                 String[] qs,
                 EntryStatistics[] es,
                 double[] ks)

Method Detail

getPostings

public WritablePosting[][] getPostings()

Returns a 2D array of posting objects for the document and terms in this result set. The array is indexed by document then by term. The first dimension retains the same order as the Docids array of the result set. The second dimension has the same ordering as the QueryTerms/EntryStatistics arrays.

Specified by:

getPostings in interface FatResultSet

Returns:

2D array of postings.

getKeyFrequencies

public double[] getKeyFrequencies()

Return the frequencies of each of the query terms in the query

Specified by:

getKeyFrequencies in interface FatResultSet

getEntryStatistics

public EntryStatistics[] getEntryStatistics()

Return the EntryStatistics of each of the query terms in the query

Specified by:

getEntryStatistics in interface FatResultSet

getCollectionStatistics

public CollectionStatistics getCollectionStatistics()

Get the collection statistics that should be applied when (re)scoring any documents in this query

Specified by:

getCollectionStatistics in interface FatResultSet

getQueryTerms

public String[] getQueryTerms()

Get the query terms in this query. This might be encoded in PostingListManager form

Specified by:

getQueryTerms in interface FatResultSet

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

IOException

getResultSet

public FatResultSet getResultSet(int start,
                        int length)

Crops the existing result file and extracts a subset from the given starting point to the ending point.

Specified by:

getResultSet in interface ResultSet

Overrides:

getResultSet in class QueryResultSet

Parameters:

start - the beginning of the subset.

length - the number of entries to get.

Returns:

a subset of the current result set.

sort

public void sort(int topDocs)

Sorts the top topDocs document in this resultset be first. The order of the remaining documents is undefined.

Specified by:

sort in interface ResultSet

Overrides:

sort in class CollectionResultSet

Parameters:

topDocs - number of documents to top-rank

setPostings

public void setPostings(WritablePosting[][] wp)

Specified by:

setPostings in interface FatResultSet

setKeyFrequencies

public void setKeyFrequencies(double[] ks)

Specified by:

setKeyFrequencies in interface FatResultSet

setEntryStatistics

public void setEntryStatistics(EntryStatistics[] es)

Specified by:

setEntryStatistics in interface FatResultSet

setCollectionStatistics

public void setCollectionStatistics(CollectionStatistics cs)

Specified by:

setCollectionStatistics in interface FatResultSet

setQueryTerms

public void setQueryTerms(String[] qs)

Specified by:

setQueryTerms in interface FatResultSet

setDocids

public void setDocids(int[] ds)

Specified by:

setDocids in interface FatResultSet

setOccurrences

public void setOccurrences(short[] os)

Specified by:

setOccurrences in interface FatResultSet

setScores

public void setScores(double[] ss)

Specified by:

setScores in interface FatResultSet