org.terrier.structures

Class LexiconEntry

java.lang.Object

org.terrier.structures.LexiconEntry

All Implemented Interfaces:

Serializable, org.apache.hadoop.io.Writable, EntryStatistics, Pointer

Direct Known Subclasses:

BasicLexiconEntry, BasicTermStatsLexiconEntry, MemoryLexiconEntry, MultiLexiconEntry

public abstract class LexiconEntry
extends Object
implements EntryStatistics, Pointer, org.apache.hadoop.io.Writable

Represents the statistics of a term in the Lexicon, and a pointer to the term's location in a PostingIndex. For these reasons, this class implements Pointer and EntryStatistics.

Author:

Craig Macdonald

See Also:

Lexicon, Pointer, EntryStatistics, Serialized Form

Constructor Summary

Constructors

Constructor and Description
LexiconEntry()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object obj)
int	getNumberOfEntries() Returns number of "things" that this pointer refers to
EntryStatistics	getWritableEntryStatistics() Get a copy of these entry statistics that can be reused.
int	hashCode()
String	pointerToString() Returns a textual representation of the pointer alone
void	setNumberOfEntries(int n) Set the number of "things that the pointer refers to
void	setPointer(Pointer p) Sets the pointer within this object to that represented by the specified pointer
abstract void	setStatistics(int n_t, int TF) Set the document frequency and term frequency
abstract void	setTermId(int newTermId) Set the term ID
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.terrier.structures.EntryStatistics

add, getDocumentFrequency, getFrequency, getTermId, subtract

Methods inherited from interface org.apache.hadoop.io.Writable

readFields, write

Constructor Detail

LexiconEntry

public LexiconEntry()

Method Detail

toString

public String toString()

Overrides:

toString in class Object

setTermId

public abstract void setTermId(int newTermId)

Set the term ID

setStatistics

public abstract void setStatistics(int n_t,
                 int TF)

Set the document frequency and term frequency

getNumberOfEntries

public int getNumberOfEntries()

Description copied from interface: Pointer

Returns number of "things" that this pointer refers to

Specified by:

getNumberOfEntries in interface Pointer

setNumberOfEntries

public void setNumberOfEntries(int n)

Description copied from interface: Pointer

Set the number of "things that the pointer refers to

Specified by:

setNumberOfEntries in interface Pointer

pointerToString

public String pointerToString()

Description copied from interface: Pointer

Returns a textual representation of the pointer alone

Specified by:

pointerToString in interface Pointer

setPointer

public void setPointer(Pointer p)

Description copied from interface: Pointer

Sets the pointer within this object to that represented by the specified pointer

Specified by:

setPointer in interface Pointer

Parameters:

p - other pointer to update the pointer in this object

getWritableEntryStatistics

public EntryStatistics getWritableEntryStatistics()

Description copied from interface: EntryStatistics

Get a copy of these entry statistics that can be reused.

Specified by:

getWritableEntryStatistics in interface EntryStatistics

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object