org.terrier.structures.indexing

Class FieldDocumentPostingList

java.lang.Object

org.terrier.structures.indexing.DocumentPostingList

org.terrier.structures.indexing.FieldDocumentPostingList

All Implemented Interfaces:

Serializable, org.apache.hadoop.io.Writable

Direct Known Subclasses:

BlockFieldDocumentPostingList

public class FieldDocumentPostingList
extends DocumentPostingList

FieldDocumentPostingList class

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.terrier.structures.indexing.DocumentPostingList

DocumentPostingList.postingIterator

Field Summary

Fields

Modifier and Type	Field and Description
protected gnu.trove.TObjectIntHashMap<String>[]	field_occurrences occurrences of terms in fields
protected int	fieldCount number of fields
protected int[]	fieldLengths length of each field

Fields inherited from class org.terrier.structures.indexing.DocumentPostingList

AVG_DOCUMENT_UNIQUE_TERMS, documentLength, occurrences

Constructor Summary

Constructors

Constructor and Description
FieldDocumentPostingList(int NUM_FIELDS) constructor

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all postings from this document
DocumentIndexEntry	getDocumentStatistics() Return a DocumentIndexEntry for this document
int[]	getFieldFrequencies(String term) Return the frequencies of the specified term in all of the fields
int[][]	getPostings(TermCodes termCodes) Returns the postings suitable to be written into the direct index.
void	insert(int tf, String term, int fieldNum) Insert a term into the posting list of this document, in the given field, with the given frequency
void	insert(int tf, String term, int[] fieldNums) Insert a term into the posting list of this document, in the given field
void	insert(String term, int fieldNum) Insert a term into the posting list of this document, in the given field
void	insert(String term, int[] fieldNums) Insert a term into the posting list of this document, in the given field
protected IterablePosting	makePostingIterator(String[] _terms, int[] termIds)
void	readFields(DataInput in)
void	write(DataOutput out)

Methods inherited from class org.terrier.structures.indexing.DocumentPostingList

forEachTerm, getDocumentLength, getFrequency, getNumberOfPointers, getPostings2, insert, insert, termSet

Methods inherited from class java.lang.Object

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

Field Detail

fieldCount

protected final int fieldCount

number of fields

fieldLengths

protected final int[] fieldLengths

length of each field

field_occurrences

protected final gnu.trove.TObjectIntHashMap<String>[] field_occurrences

occurrences of terms in fields

Constructor Detail

FieldDocumentPostingList

public FieldDocumentPostingList(int NUM_FIELDS)

constructor

Parameters:

NUM_FIELDS -

Method Detail

insert

public void insert(int tf,
                   String term,
                   int fieldNum)

Insert a term into the posting list of this document, in the given field, with the given frequency

Parameters:

tf - frequency of the term in this document

term - String form of term

fieldNum - fieldNumber it occurs in

insert

public void insert(String term,
                   int fieldNum)

Insert a term into the posting list of this document, in the given field

Parameters:

term - the Term being inserted

fieldNum - the id of the field that the term was found in

insert

public void insert(String term,
                   int[] fieldNums)

Insert a term into the posting list of this document, in the given field

Parameters:

term - the Term being inserted

fieldNums - the ids of the fields that the term was found in, starting from 0

insert

public void insert(int tf,
                   String term,
                   int[] fieldNums)

Insert a term into the posting list of this document, in the given field

Parameters:

tf - the frequency of the term

term - the Term being inserted

fieldNums - the ids of the fields that the term was found in

getFieldFrequencies

public int[] getFieldFrequencies(String term)

Return the frequencies of the specified term in all of the fields

getDocumentStatistics

public DocumentIndexEntry getDocumentStatistics()

Return a DocumentIndexEntry for this document

Overrides:

getDocumentStatistics in class DocumentPostingList

clear

public void clear()

Description copied from class: DocumentPostingList

Removes all postings from this document

Overrides:

clear in class DocumentPostingList

getPostings

public int[][] getPostings(TermCodes termCodes)

Description copied from class: DocumentPostingList

Returns the postings suitable to be written into the direct index. During this, TermIds are assigned.

Overrides:

getPostings in class DocumentPostingList

makePostingIterator

protected IterablePosting makePostingIterator(String[] _terms,
                                              int[] termIds)

Overrides:

makePostingIterator in class DocumentPostingList

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

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

Overrides:

readFields in class DocumentPostingList

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Specified by:

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

Overrides:

write in class DocumentPostingList

Throws:

IOException